Valuing ecosystem functions: an empirical study on the storm progtection function of Bhitarkanika mangrove ecosystem, India
Environmental Conservation 32 (1): 85–92 © 2005 Foundation for Environmental Conservation doi:10.1017/S0376892905001967
Valuing ecosystem functions: an empirical study on the storm protection
function of Bhitarkanika mangrove ecosystem, India
RUCHI BADOLA* AND S.A. HUSSAIN
Wildlife Institute of India, Post Box # 18, Dehra Dun, 248001, India
Date submitted: 8 September 2004 Date accepted: 21 February 2005
welfare (de Groot 1992; Ehrlich & Ehrlich 1992; Barbier
SUMMARY
et al. 1994; Costanza et al. 1997a; de Groot et al. 2002).
The ecosystem services provided by mangroves are
Biodiversity at genetic, species, population and ecosystem
often ignored in the ongoing process of mangrove
levels contributes to maintaining these functions and services.
conversion. Services provided by the Bhitarkanika
Mangrove ecosystems are widely recognized as providers of
mangrove ecosystem in India and estimated cyclone
a great variety of goods and services to people, providing
damage avoided in three selected villages, taking the
optimal breeding, feeding and nursery grounds for many
cyclone of 1999 as a reference point, were valued by
ecologically and economically important fish and shellfish
assessing the socio-economic status of the villages,
species (Macnae 1974), as well as feeding habitats for resident
the cyclone damage to houses, livestock, fisheries,
and migrant water birds. They are valuable sources of fuel
trees and other assets owned by the people, and the
wood, fodder, timber, tannin and other natural products
level and duration of flooding. Eleven variables were
for local people (Rasolofo 1997; Spaninks & van Beukering
used to compare damage in the villages, one protected
1997). Mangrove forests protect freshwater resources against
by mangroves, one unprotected by mangroves, and
saltwater intrusion; they protect the land from eroding waves
the third possessing an embankment on its seaward
and winds (Semesi 1998) and stabilize the coastal land (Carlton
side. Attitude surveys were carried out in 10% of the
1974). Mangrove forests can be considered as natural barriers
households in 35 villages located in the Bhitarkanika
protecting the life and property of coastal communities from
Conservation Area to assess local people’s perceptions
storms and cyclones. The above-ground root system retards
regarding the storm protection function of mangroves
water flow that not only encourages sediment to settle,
and their attitude towards mangrove forests generally.
but also inhibits its resuspension (Gilbert & Janssen 1998).
In the mangrove-protected village, variables had either
Stabilization of sediments provides protection to shorelines
the lowest values for adverse factors (such as damage
and associated shore-based activities and can lead to land gains
to houses), or the highest values for positive factors
(Spaninks & van Beukering 1997).
(such as crop yield). The loss incurred per household
Despite centuries of biological research on mangrove
was greatest (US$ 153.74) in the village that was not
structure, productivity and ecosystem dynamics (Rollet 1981)
sheltered by mangroves but had an embankment,
and an understanding and recognition of mangrove benefits
followed by the village that was neither in the shadow
by scientists, governments and local populations, destruction
of mangroves or the embankment (US$ 44.02) and the
of mangrove ecosystems continues (Saenger et al. 1983;
village that was protected by mangrove forests (US$
Field et al. 1998; Semesi 1998). The ecosystem services
33.31). The local people were aware of and appreciated
provided by mangroves are often ignored in the ongoing
the functions performed by the mangrove forests in
process of mangrove conversion (Barbier 1993; Ruitenbeek
protecting their lives and property from cyclones, and
1994; Swallow 1994). The economic value of direct products
were willing to cooperate with the forest department
from mangrove forests proves more important in decision
in mangrove restoration.
making for their management as these usually accrue locally
(Adger et al. 1997). Hence, the exploitation of mangroves
Keywords: attitudes, economic valuation, ecosystem services,
usually focuses only on single uses based on narrow economic
local people, mangrove ecosystem, storm protection function
valuations. For mangrove conservation and exploitation
to occur simultaneously, economic analyses that focus on
INTRODUCTION
multiple-use aspects of mangroves are needed (Ruitenbeek
1994). Appropriate values for ecosystem services once derived
Ecosystem functions are the conditions and processes through
may be inserted into the decision-making process in order to
which natural ecosystems and their constituent species sustain
correct the market signals (Costanza et al. 1989).
and fulfil human life (Daily 1997). Ecological services are those
Economic valuation is an attempt to assign quantitative
ecosystem functions that are perceived to support human
values to the goods and services provided by natural resources
where market prices are not available, and thus help to
inform decisions regarding resource allocation (Barbier et al.
* Correspondence: Dr Ruchi Badola Tel: +91 135 2640112 Fax: +91
1997; Daily et al. 1997). In the field of protected area
135 2640117 e-mail: ruchi@wii.gov.in
86 R. Badola and S.A. Hussain
Figure 1 Kendarapara and
Bhadrak districts of Orissa, India,
showing the location of
Bhitarkanika Conservation Area
and the extent of mangrove forests.
management, economic valuation can be useful to indicate the heronries and an important refuge for migratory waterfowl
real opportunity cost of alternative uses of natural resources (Nayak 2002), besides being rich in fishery-target fish and
(Richards 1994). The estimated economic value of mangrove shellfish (Chadah & Kar 1999). The mangrove and associated
forests ranges between US$ 9900–US$ 35 921 per hectare (see forests help meet subsistence requirements for timber, fuel
Costanza et al. 1997b; Sathirathai & Barbier 2001). Although wood, tannin, honey, fodder and thatch and provide livelihood
the range of value may vary, for example as a consequence of opportunities for local people (Badola & Hussain 2003).
site specificity and method used, with such calculus mangrove The loss of Bhitarkanika mangrove forests has been mainly
conservation becomes a tangible value that can help in land- a result of human encroachment, reclamation of land for
use decision making. agriculture and unsustainable practices such as aquaculture
The Bhitarkanika mangrove ecosystem is the second largest and mechanized fishing (Chadah & Kar 1999). Recent
mangrove forest of mainland India (Fig. 1). Originally around developments, such as construction of jetties and roads and
672 km2 , it is now limited to an area of 145 km2 and is a possible major port at Dhamra, threaten the ecosystem
a wildlife sanctuary (Chadah & Kar 1999). This deltaic, (Badola & Hussain 2003). Declaration of the mangrove forests
mangrove forest harbours the highest diversity of Indian of Bhitarkanika as a protected area (PA) has reduced access
mangrove flora, the largest known rookery of the olive ridley to life support, while the unsustainable resource use in the
sea turtle Lepidochelys olivacea in the world, the last of the area has been a major threat to its continued existence. The
three remaining populations of saltwater crocodiles Crocodylus scenario is one of mutually exclusive conservation efforts
porosus in India, the largest known population of king cobra and development initiatives that translate into resource-
Ophiophagus hannah and the water monitor lizard Varanus use conflicts between the forest department and the local
salvator (Patnaik et al. 1995). It is also one of the largest communities.
87
Valuing storm protection by mangrove forests
With a view to valuing the uses and ecological services officinalis and Hibiscus tiliaceus, with occasional Sonneratia
provided by the Bhitarkanika mangrove ecosystem, quanti- apetala. Climbers like Caesalpinia cristata and Dalbergia
fying the dependence of local communities on it, identifying spinosa are abundant in the riverine patches, making them
marginalized stakeholders, and examining the attitudes of local almost impenetrable. In the small open patches, under-
communities towards present management, we set out to value shrubs of Acanthus predominate. The influence of the ocean
the storm protection functions of the Bhitarkanika mangrove is reflected in the floral composition. Avicennia marina,
forests. This was based on the perceptions of local people Sonneratia apetala and some rare Rhizophoraceae increase in
regarding the services provided by mangrove forests and frequency towards the ocean and Hibiscus tiliaceus disappears
their attitudes towards these forests generally. We aimed to completely. Aegialitis rotundifolia and Avicennia marina are
measure the economic losses attributed to the cyclone relative found only in areas of high salinity. The other two species
to the prevailing socio-economic conditions of the study of Avicennia, namely A. alba and A. officinalis, show a wider
villages. range of salt tolerance. Brownlowia tersa and Merope angulata
A super cyclone with a wind speed of around 260 km h−1 and are found mostly in small creeks. Phoenix paludosa occurs
a storm surge of about 9 m hit the Orissa coast in the month of in degraded areas, being abundant in some patches. Hibiscus
October 1999. This storm travelled more than 250 km inland tiliaceus is a species preferring drier areas where the water level
and, within a period of 36 h, ravaged more than 20 million ha has fallen and inundation is rare. Cynometra spp. are found in
of land, affecting around 15 million people (Tynkkynen 2000). association with Pongamia spp., Hibiscus spp. and Salvadora
We evaluated the extent of damage caused in areas that were spp., and Dalbergia spp., Heritiera spp. and Excoecaria spp.
in the cover of mangrove forests and areas that were not, in the occur in firm ground away from the shoreline. Sonneratia
wake of this super cyclone. In 1971, embankment was created spp. occurs on the shoreline and survives on loose substratum
along the entire Orissa coast. Therefore, we also studied the (Badola & Hussain 2003).
effectiveness of such man-made structures in providing storm
protection, as opposed to mangrove forests.
METHODS
We used the damage-cost avoided approach (Bann 1998)
Study area
to value the storm protection function of the Bhitarkanika
The Bhitarkanika Conservation Area (BCA) is located in mangrove ecosystem. The actual damages avoided due to
the eastern state of Orissa, (86◦ 45 –87 50 E and 20◦ mangrove forest were estimated after a cyclone hit the
40 –20◦ 48 N; Patnaik et al. 1995). This mangrove forest area in October 1999. Socio-economic data pertaining to
and the associated coast harbour the highest diversity of local demography and economic conditions were collected
Indian mangrove flora and fauna (Naskar & Mandal 1999). from 35 villages located in and around the BCA. Data on
The mangrove forests of Bhitarkanika differ considerably demography, land use and occupational patterns, resource
from other mangroves because of the dominant tree species use, and perceptions and attitudes were gathered through a
Sonneratia apetala, Heritiera fomes, H. littoralis and several questionnaire survey from 10% of the households. We col-
Avicennia species. In addition, there is one species of grass lected preliminary information randomly by asking people
Myriostachya wightiana, which is very common in the area about the losses they incurred because of the 1999 cyclone.
but practically unknown elsewhere (Blasco 1977). There are On this basis, we tried to compare the impact of the cyclone
64 species of plants in BCA, which include 28 true mangroves, in villages that had mangrove cover with those unprotec-
four mangrove associates and 32 other species (Badola & ted by mangrove forests, but since coastal embankments have
Hussain 2003). been constructed in Orissa to prevent seawater intrusion into
In 1975, the mangrove forests and the adjacent land of reclaimed paddy fields, it was imperative that the effects
Bhitarkanika were declared a wildlife sanctuary encompassing of embankments and mangroves be separated. Hence, the
an area of 672 km2 , with a core area of 145 km2 being following three situations were identified: (1) a village in
designated national park. The coastline stretches 35 km the shadow of mangrove (2) a village not in the shadow of
along its eastern side, constituting the Gahirmatha Marine mangrove and having no embankment, and (3) a village not
Sanctuary (GMS). The Bhitarkanika National Park (BNP), in the shadow of mangrove, but with an embankment on the
the Bhitarkanika Wildlife Sanctuary (BWS) and parts of the seaward side.
GMS, together with 336 villages and adjacent cultivated Based on a land-use cover map prepared in a geographical
agricultural lands within the BWS, together constitute the information system domain (Fig. 1), three study villages were
BCA, an area of c. 3000 km2 (Fig. 1). The mangrove formations identified, representing the three situations. Care taken to
of the BCA were once widespread, but are now restricted to avoid variations in damage attributable to wind, water logging
the BNP, whereas the BWS has a few degraded mangroves and distance of villages from the coast and mangrove forests
and palm swamps (Badola & Hussain 2003). limited the sample size to three villages. Bankual village was in
Within the BNP the initial band of vegetation at the water’s the shadow of mangrove forest, Singidi village was neither in
edge is usually the tall Myriostachya wightiana grass, while the shadow of mangroves nor protected by embankment from
landward of this the mangrove is dominated by Avicennia storm surge, and Bandhamal village was not in the shadow of
88 R. Badola and S.A. Hussain
Table 1 Overall characteristics of the village agroecosystem in the total collapse, i.e. the sum of the damage to all the structures
Bhitarkanika Conservation Area, India. (n = 35 villages; SEM = (thatch, poles, roof, beams and walls) of the house. We used
standard error of the mean). Statistical Package for the Social Sciences (SPSS) software for
Mean SEM data processing and performed one-way ANOVA tests (Zar
Habitation (ha) 113.27 3.98 1984) to compare the means of various variables for the three
Average size of paddy fields 1.32 0.120 villages.
Overall paddy yield (kg ha−1 ) 948.83 0.56
Net area sown (irrigated, ha) 1.46 0.59
Net area sown (non-irrigated, ha) 6.44 2.61 RESULTS
No. of coconut trees/household 9.44 1.05
Income of the family (US$ yr−1 ) The villages situated around the Bhitarkanika mangrove
488.86 10.401
forests had a mean area of c. 113.27 ha per village and the
% People unemployed 13.58 0.613
economy was primarily agricultural, possessing small land
holdings and being dependent on the monsoon. The average
size of paddy fields was 1.32 ha, and the total area sown was
mangroves, but had seaward side embankment. The intensity c. 7.9 ha per village, of which only 1.46 ha was irrigated.
of the impact of the 1999 cyclone on these villages should In addition to the single crop of paddy, small quantities of
have been fairly uniform, as all the three selected villages vegetables, coconut and fish were produced. Every household
were equidistant from the seashore and had similar aspects. owned around nine coconut trees and about 38 coconuts were
The two villages outside mangrove cover were located close produced from each tree. The average family income was
low at US$ 488 yr−1 . About 13.5% people were unemployed
to each other, but both were far from the mangrove forest
in order to eliminate any effect of mangrove forest presence (Table 1). Apart from a small proportion of people engaged
(Table 1). We conducted a door-to-door survey and sampled in government service, most of the people’s livelihoods were
100% of the selected households to assess the socio-economic based on agriculture and fisheries and related business.
status of the villages, the actual damage to houses, livestock, The overall human density in the study villages was 260–
340 people km−2 , the mean household size being between 4.5
fisheries, trees and other assets owned by the people and the
rate, level and duration of flooding. To assess the type of (Bankual) and 8.2 people (Singdi) (Table 2). The literacy level
damage caused to houses, we developed a composite score or was highest for Singdi and lowest for Bankual. In Singdi and
damage rating (DR) for each of the households surveyed in the Bankual, 70% of people were engaged in agriculture, whereas
three villages. The scores were in the range of 0–19 depending in Bandhamal, 61% were labourers (Table 2). Most of the
on the intensity of damage to the house. A value of 19 signified houses (94%) were made of mud and thatch.
Table 2 General characteristics of General characterstics Villages
the three intensively studied
Singdi Bankual Bandhamal
villages in the Bhitarkanika
Conservation Area, India. Location details
* House made of brick and cement. Distance from mangrove forest (km) 9.2 0 8.2
** House made of mud and thatch. Distance from sea coast (km) 12.65 12.13 12.18
Distance from dyke (km) No dyke 2.37 0.45
Demographic characteristics
Total area (ha) 122.63 55.75 147.27
Human density (persons km2 ) 314 340 260
Number of households 58 42 56
Mean household size 8.2 4.5 6.8
Total population 353 189 383
Literacy (%) 56.7 31.2 38.6
Economic characteristics
People involved in agriculture (%) 70.6 70.6 14.4
People involved in fishing, animal 0 14.7 0
husbandry and allied activities (%)
People involved in labour (%) 22.4 2.95 61.4
People involved in other activities (%) 7.03 11.8 24.4
Type of houses
Total no. of houses (n) 37 38 32
Pucca* (%) 5.4 0 0
Pucca with thatched roof (%) 0 2.6 9.4
Partially pucca (%) 2.7 0 0
Fully kutcha** (%) 91.9 97.4 90.6
89
Valuing storm protection by mangrove forests
Table 3 Basic description and Villages
mean values of the variables (per
Variables Description Singdi Bankual Bandhamal
household) examined for
comparing the damage due to DR Damage to houses (0–19 scale) 9.40 5.34 10.44
cyclone in three study villages in PTD Tree damage (%) 21.0 3.3 15.5
the Bhitarkanika Conservation DPP Damage to other personal property (INR) 108.11 0.00 2375.00
Area, India. (US$ 1 = INR 45, DL Damage to livestock in money terms (INR) 54.05 127.63 1044.37
August 2004). FP Flooding in premises (m) 0.34 0.29 0.58
FF Flooding in fields (m) 1.99 1.09 1.39
WLF Water logging in fields (days) 9.46 5.63 12.87
CR Cost of repair and reconstruction (INR) 996.97 682.86 973.21
Yield for the year 1999 (kg ha−1 )
Y99 531 1479.5 335.9
LFS Loss of fish seedlings (fingerlings) 310.81 69.74 260.94
released prior to cyclone (INR)
TML Total quantifiable variables (INR) 1983.3 61454.13 6918.62
being highest in Bandhamal (0.6 m ± 0.05 m) and lowest for
Table 4 Results of the ANOVA for each variable and significance of
Bankual (0.3 m ± 0.04 m) (Table 3). The highest level of
their means. See Table 3 for variable definitions.
Variable n df F p value saline water intrusion in the crop fields (FF) was for Singdi,
followed by Bandhamal and Bankual. Flood water remained in
DR 107 1 14.633 0.000
PTD 93 1 9.891 0.000 fields (WLF) for longest duration in Bandhamal, flood retreat
DPP 107 1 6.814 0.002 for Singdi and Bankual being faster (Tables 3 and 4).
DL 107 1 5.398 0.006 The standing crops of paddy were severely affected by the
FP 103 1 7.670 0.001 cyclone. Crop production differed among the three villages
FF 100 1 35.102 0.000
(Table 4), Bankual having the greatest paddy yield for 1999
WLF 102 1 18.654 0.000
(Y99) of 1479.5 kg ha−1 , while in Singdi the yield was 531 kg
CR 96 1 1.270 0.286
ha−1 and in Bandhamal it was 335.9 kg ha−1 (Table 3). The
Y99 59 1 99.029 0.000
mean paddy yield differed for all three villages between the
LFS 107 1 1.506 0.227
years 1999 and 2001 (F = 99.029, df = 1, p = 0.000); in 1999
TML 98 1 17.936 0.000
it was 568 kg ha−1 while in 2001 it was 1012.7 kg ha−1 .
At the time of this study, the fishponds had not been
harvested, however, the loss to fisheries was significant because
Damage attributed to wind and storm surge
of the loss of the fingerlings released that year. The greatest
The high-speed winds and storm surge generally damaged
damage to fish seedlings per household (LFS) was in Singdi,
the mud and thatch houses, with not many cases of damage to
where INR 310.8 ± 144.97 (US$ 6.91) of seedlings released
roof frames being reported. However, about 49.5% of houses
were washed away, and the least damage was in Bankual (INR
had their roof blown away, accompanied by either cracking
69.7 ± 32.20, US$ 1.55; Table 3).
of walls or their partial collapse on some sides, the maximum
mean DR being 9.4 ± 0.7 for Singdi village and the minimum
mean DR being 5.3 ± 0.5 for Bankual village (Table 3). Mean Total monetary loss
DR to houses varied among the three villages (Table 4). The
Total losses in monetary terms were calculated for each of the
percentage of trees dying (PTD) attributed to the cyclone
households in the three villages by combining the values of
was highest in Singdi (21.0%), while only 3.3% of trees were
the cost of repair and reconstruction (CR), damage to other
damaged in Bankual (Tables 3 and 4), which had the highest
personal property such as boats, fishing nets and household
number of trees (Table 2). Costs for reconstruction work
goods (DPP), damage to livestock (DL) and loss of agricultural
per household (CR) did not differ between villages (Table
products (i.e. difference in total paddy production between
4). The highest value was INR 997.0 ± 182.18 (US$ 22.15)
2001–1999, taking the area cultivated in 1999 as the basis).
for Singdi, while the lowest was INR 682.9 ± 144.05 (US$
The loss incurred per household (TML) was highest in
15.17) for Bankual. Loss to private property such as boats,
Bandhamal (US$ 153.74) followed by Singdi (US$ 44.07) and
nets (DPP) and livestock casualties (DL) were highest in
Bankual (US$ 32.31) (Tables 3 and 4).
Bandhamal (Tables 3 and 4), the village far from the mangrove
forests but protected by the embankment (Table 2).
Attitudes and perceptions of local people
Damage attributed to saline water intrusion
When asked to rank the ecological services performed by
Flooding levels in houses and crop fields differed among mangrove forests, 89% of respondents gave the highest
villages (Table 4), saline water intrusion into houses (FP) preference to cyclone mitigation and flood control. They
90 R. Badola and S.A. Hussain
Table 5 Ranking of various Ecological functions/values Rank 1 (%) Rank 2 (%) Rank 3 (%)
functions performed by the Cyclone mitigation and flood control 88.6 11 0.4
mangrove forests by the people of Land erosion prevention 50 50 0
the Bhitarkanika Conservation Aesthetic value 38 61.2 0.8
Area, India (n = 268). Augment agricultural production 8 92 0
Contribute in fish production 1.9 96.2 1.9
Historical and cultural value 8.8 88.9 2.3
Others 18.9 70.3 10.8
Table 6 Attitudes of local people Responses (%)
towards Bhitarkanika Wildlife
Questions Yes No Indifferent
Sanctuary, India and conservation
initiatives taken by Forest Are you aware that Bhitarkanika is declared 89.6 10.4 0
Department of Government of national park and sanctuary?
Orissa (n = 268). Do you feel any sense of responsibility for 84.3 13.4 2.2
the protection of diverse flora and fauna?
Do you think your rights have been violated 18.3 72.8 9
after declaration of park?
Do you face any problems because of park? 5.6 84.7 9
Are you in favour of integrated conservation 92.9 2.2 4.9
and development projects for the area?
Would you like to cooperate with forest 43.3 23.1 36.6
department for mangrove restoration?
ranked the land erosion prevention function second (Table 5). cover. During the last century, mangroves from these areas
In the villages located far from the mangrove forest, 92.5% were destroyed or degraded by people, making these areas
of males and 97.5% of females perceived that mangroves vulnerable to the damage caused by cyclones.
were beneficial to their lives and property. The contribution Many authors have emphasized the protection from storms
of mangrove forests to increasing agricultural productivity, and cyclones that mangroves offer to coastal areas (see Carlton
as well as providing protection from storms and cyclones, 1974: Maltby 1986; Semesi 1998), however there are few
was considered most important. However, more people empirical studies that provide quantitative information on
from villages located near mangrove forests appreciated this function of mangrove forests. Although only indicative,
their contribution to agricultural productivity, while more we show that the damage attributed to the cyclone was more
people from the villages far from mangroves regarded storm extensive in villages further away from the mangrove shadow.
protection as an important contribution. About 90% people The embankments constructed in 1971 after a previous
in the area were aware that the Bhitarkanika mangrove forests cyclone to prevent intrusion of saline water into agricultural
have protected status. A high percentage (84%) of people felt fields and villages were ineffective during the high storm-
responsible for the conservation of flora and fauna, while 93% surge; in fact they acted as a barrier to run-off when the
were in favour of an integrated conservation and development water was receding. The embankments suffered a number
programme (ICDP). Approximately 43% of people were of breaches that resulted in the flooding of villages such
willing to cooperate with the forest department in mangrove as Bandhamal, which was surrounded on all sides by the
restoration. Only 18% people felt the park’s declaration embankment. Singdi village with no mangrove cover and no
violated rights, the main reason being the access denied to embankment suffered the highest level of field inundation,
firewood (Table 6). however the seawater receded quickly, resulting in less damage
to agricultural crops. Bankual village, which was in the shadow
of mangrove forest and had little embankment around it,
DISCUSSION
suffered the least. Although this study is not conclusive,
Every year about 80 tropical cyclones with winds ≥ 35 knots the lack of breaches in the embankment closer to forest is
form in the world’s waters (McBride 1995), about 6.5% of indicative of the protection provided by mangroves to the
them occurring in Bay of Bengal and Arabian Sea (Neumann embankment. In areas far from the forest, several breaches in
1993). The cyclones forming in the Bay of Bengal hit the the embankment were observed. Water levels were higher
east coast of India, particularly the states of Andhra Pradesh, and the flooding was of longer duration in Bandhamal.
Orissa and West Bengal, every year, causing heavy loss of The cyclone uprooted almost all the trees in the immediate
life and property. Along the Indian coast, all those areas that vicinity of the coast and caused much damage to trees several
are vulnerable to tropical cyclones once had natural mangrove kilometres inland. Unofficially, the damage to horticulture
91
Valuing storm protection by mangrove forests
and orchards was estimated to be INR 200 billion (Tynkkynen communities. The awareness and appreciation by the local
2000). However, mangrove forests and trees in the shadow of people of the functions performed by the mangrove forest is a
mangrove forests were intact. positive sign for conservation of the area.
We contend that the vulnerability of many coastal human
communities to cyclones is heightened by the removal of ACKNOWLEDGEMENTS
mangroves for development, agriculture and habitation. While
The India Environment Management Capacity Building
property damage from storms and hurricanes is highest in the
(EMCaB) Project, Indira Gandhi Institute of Development
developed northern nations, deaths and injury are usually
Research (IGIDR), Mumbai, provided funding support for
highest in the poor tropical and sub-tropical nations, where
this study. We thank Chief Wildlife Warden, Government
larger numbers of people are exposed to the storms (Maltby
of Orissa and Mr Anup Nayak, Divisional Forest Officer,
1986). Mangrove forests are natural buffers against storm
Mangrove Forest Division, Rajanagar, Orissa for permitting
surges (Maltby 1986), protecting tropical shores from erosion
us to carry out this research in the Bhitarkanika Wildlife
by tides and currents. Macintosh (1983) recommended that
Sanctuary. We thank Dr Hemant Kumar Sahu, Ms Poonam
a mangrove strip at least 100 m wide should be left as a
Semwal, Ms Kalpana Ambastha, Ms Shivani Chandola and
buffer zone on more exposed shores. During the present
Mr Anoop K.R. for helping us with field data collection and
study, we realized that the artificial sea defences were not only
analysis.
expensive to build and repair, but they were also, in many
cases, ineffective. Extensive Casuarina plantations established
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Valuing ecosystem functions: an empirical study on the storm protection
function of Bhitarkanika mangrove ecosystem, India
RUCHI BADOLA* AND S.A. HUSSAIN
Wildlife Institute of India, Post Box # 18, Dehra Dun, 248001, India
Date submitted: 8 September 2004 Date accepted: 21 February 2005
welfare (de Groot 1992; Ehrlich & Ehrlich 1992; Barbier
SUMMARY
et al. 1994; Costanza et al. 1997a; de Groot et al. 2002).
The ecosystem services provided by mangroves are
Biodiversity at genetic, species, population and ecosystem
often ignored in the ongoing process of mangrove
levels contributes to maintaining these functions and services.
conversion. Services provided by the Bhitarkanika
Mangrove ecosystems are widely recognized as providers of
mangrove ecosystem in India and estimated cyclone
a great variety of goods and services to people, providing
damage avoided in three selected villages, taking the
optimal breeding, feeding and nursery grounds for many
cyclone of 1999 as a reference point, were valued by
ecologically and economically important fish and shellfish
assessing the socio-economic status of the villages,
species (Macnae 1974), as well as feeding habitats for resident
the cyclone damage to houses, livestock, fisheries,
and migrant water birds. They are valuable sources of fuel
trees and other assets owned by the people, and the
wood, fodder, timber, tannin and other natural products
level and duration of flooding. Eleven variables were
for local people (Rasolofo 1997; Spaninks & van Beukering
used to compare damage in the villages, one protected
1997). Mangrove forests protect freshwater resources against
by mangroves, one unprotected by mangroves, and
saltwater intrusion; they protect the land from eroding waves
the third possessing an embankment on its seaward
and winds (Semesi 1998) and stabilize the coastal land (Carlton
side. Attitude surveys were carried out in 10% of the
1974). Mangrove forests can be considered as natural barriers
households in 35 villages located in the Bhitarkanika
protecting the life and property of coastal communities from
Conservation Area to assess local people’s perceptions
storms and cyclones. The above-ground root system retards
regarding the storm protection function of mangroves
water flow that not only encourages sediment to settle,
and their attitude towards mangrove forests generally.
but also inhibits its resuspension (Gilbert & Janssen 1998).
In the mangrove-protected village, variables had either
Stabilization of sediments provides protection to shorelines
the lowest values for adverse factors (such as damage
and associated shore-based activities and can lead to land gains
to houses), or the highest values for positive factors
(Spaninks & van Beukering 1997).
(such as crop yield). The loss incurred per household
Despite centuries of biological research on mangrove
was greatest (US$ 153.74) in the village that was not
structure, productivity and ecosystem dynamics (Rollet 1981)
sheltered by mangroves but had an embankment,
and an understanding and recognition of mangrove benefits
followed by the village that was neither in the shadow
by scientists, governments and local populations, destruction
of mangroves or the embankment (US$ 44.02) and the
of mangrove ecosystems continues (Saenger et al. 1983;
village that was protected by mangrove forests (US$
Field et al. 1998; Semesi 1998). The ecosystem services
33.31). The local people were aware of and appreciated
provided by mangroves are often ignored in the ongoing
the functions performed by the mangrove forests in
process of mangrove conversion (Barbier 1993; Ruitenbeek
protecting their lives and property from cyclones, and
1994; Swallow 1994). The economic value of direct products
were willing to cooperate with the forest department
from mangrove forests proves more important in decision
in mangrove restoration.
making for their management as these usually accrue locally
(Adger et al. 1997). Hence, the exploitation of mangroves
Keywords: attitudes, economic valuation, ecosystem services,
usually focuses only on single uses based on narrow economic
local people, mangrove ecosystem, storm protection function
valuations. For mangrove conservation and exploitation
to occur simultaneously, economic analyses that focus on
INTRODUCTION
multiple-use aspects of mangroves are needed (Ruitenbeek
1994). Appropriate values for ecosystem services once derived
Ecosystem functions are the conditions and processes through
may be inserted into the decision-making process in order to
which natural ecosystems and their constituent species sustain
correct the market signals (Costanza et al. 1989).
and fulfil human life (Daily 1997). Ecological services are those
Economic valuation is an attempt to assign quantitative
ecosystem functions that are perceived to support human
values to the goods and services provided by natural resources
where market prices are not available, and thus help to
inform decisions regarding resource allocation (Barbier et al.
* Correspondence: Dr Ruchi Badola Tel: +91 135 2640112 Fax: +91
1997; Daily et al. 1997). In the field of protected area
135 2640117 e-mail: ruchi@wii.gov.in
86 R. Badola and S.A. Hussain
Figure 1 Kendarapara and
Bhadrak districts of Orissa, India,
showing the location of
Bhitarkanika Conservation Area
and the extent of mangrove forests.
management, economic valuation can be useful to indicate the heronries and an important refuge for migratory waterfowl
real opportunity cost of alternative uses of natural resources (Nayak 2002), besides being rich in fishery-target fish and
(Richards 1994). The estimated economic value of mangrove shellfish (Chadah & Kar 1999). The mangrove and associated
forests ranges between US$ 9900–US$ 35 921 per hectare (see forests help meet subsistence requirements for timber, fuel
Costanza et al. 1997b; Sathirathai & Barbier 2001). Although wood, tannin, honey, fodder and thatch and provide livelihood
the range of value may vary, for example as a consequence of opportunities for local people (Badola & Hussain 2003).
site specificity and method used, with such calculus mangrove The loss of Bhitarkanika mangrove forests has been mainly
conservation becomes a tangible value that can help in land- a result of human encroachment, reclamation of land for
use decision making. agriculture and unsustainable practices such as aquaculture
The Bhitarkanika mangrove ecosystem is the second largest and mechanized fishing (Chadah & Kar 1999). Recent
mangrove forest of mainland India (Fig. 1). Originally around developments, such as construction of jetties and roads and
672 km2 , it is now limited to an area of 145 km2 and is a possible major port at Dhamra, threaten the ecosystem
a wildlife sanctuary (Chadah & Kar 1999). This deltaic, (Badola & Hussain 2003). Declaration of the mangrove forests
mangrove forest harbours the highest diversity of Indian of Bhitarkanika as a protected area (PA) has reduced access
mangrove flora, the largest known rookery of the olive ridley to life support, while the unsustainable resource use in the
sea turtle Lepidochelys olivacea in the world, the last of the area has been a major threat to its continued existence. The
three remaining populations of saltwater crocodiles Crocodylus scenario is one of mutually exclusive conservation efforts
porosus in India, the largest known population of king cobra and development initiatives that translate into resource-
Ophiophagus hannah and the water monitor lizard Varanus use conflicts between the forest department and the local
salvator (Patnaik et al. 1995). It is also one of the largest communities.
87
Valuing storm protection by mangrove forests
With a view to valuing the uses and ecological services officinalis and Hibiscus tiliaceus, with occasional Sonneratia
provided by the Bhitarkanika mangrove ecosystem, quanti- apetala. Climbers like Caesalpinia cristata and Dalbergia
fying the dependence of local communities on it, identifying spinosa are abundant in the riverine patches, making them
marginalized stakeholders, and examining the attitudes of local almost impenetrable. In the small open patches, under-
communities towards present management, we set out to value shrubs of Acanthus predominate. The influence of the ocean
the storm protection functions of the Bhitarkanika mangrove is reflected in the floral composition. Avicennia marina,
forests. This was based on the perceptions of local people Sonneratia apetala and some rare Rhizophoraceae increase in
regarding the services provided by mangrove forests and frequency towards the ocean and Hibiscus tiliaceus disappears
their attitudes towards these forests generally. We aimed to completely. Aegialitis rotundifolia and Avicennia marina are
measure the economic losses attributed to the cyclone relative found only in areas of high salinity. The other two species
to the prevailing socio-economic conditions of the study of Avicennia, namely A. alba and A. officinalis, show a wider
villages. range of salt tolerance. Brownlowia tersa and Merope angulata
A super cyclone with a wind speed of around 260 km h−1 and are found mostly in small creeks. Phoenix paludosa occurs
a storm surge of about 9 m hit the Orissa coast in the month of in degraded areas, being abundant in some patches. Hibiscus
October 1999. This storm travelled more than 250 km inland tiliaceus is a species preferring drier areas where the water level
and, within a period of 36 h, ravaged more than 20 million ha has fallen and inundation is rare. Cynometra spp. are found in
of land, affecting around 15 million people (Tynkkynen 2000). association with Pongamia spp., Hibiscus spp. and Salvadora
We evaluated the extent of damage caused in areas that were spp., and Dalbergia spp., Heritiera spp. and Excoecaria spp.
in the cover of mangrove forests and areas that were not, in the occur in firm ground away from the shoreline. Sonneratia
wake of this super cyclone. In 1971, embankment was created spp. occurs on the shoreline and survives on loose substratum
along the entire Orissa coast. Therefore, we also studied the (Badola & Hussain 2003).
effectiveness of such man-made structures in providing storm
protection, as opposed to mangrove forests.
METHODS
We used the damage-cost avoided approach (Bann 1998)
Study area
to value the storm protection function of the Bhitarkanika
The Bhitarkanika Conservation Area (BCA) is located in mangrove ecosystem. The actual damages avoided due to
the eastern state of Orissa, (86◦ 45 –87 50 E and 20◦ mangrove forest were estimated after a cyclone hit the
40 –20◦ 48 N; Patnaik et al. 1995). This mangrove forest area in October 1999. Socio-economic data pertaining to
and the associated coast harbour the highest diversity of local demography and economic conditions were collected
Indian mangrove flora and fauna (Naskar & Mandal 1999). from 35 villages located in and around the BCA. Data on
The mangrove forests of Bhitarkanika differ considerably demography, land use and occupational patterns, resource
from other mangroves because of the dominant tree species use, and perceptions and attitudes were gathered through a
Sonneratia apetala, Heritiera fomes, H. littoralis and several questionnaire survey from 10% of the households. We col-
Avicennia species. In addition, there is one species of grass lected preliminary information randomly by asking people
Myriostachya wightiana, which is very common in the area about the losses they incurred because of the 1999 cyclone.
but practically unknown elsewhere (Blasco 1977). There are On this basis, we tried to compare the impact of the cyclone
64 species of plants in BCA, which include 28 true mangroves, in villages that had mangrove cover with those unprotec-
four mangrove associates and 32 other species (Badola & ted by mangrove forests, but since coastal embankments have
Hussain 2003). been constructed in Orissa to prevent seawater intrusion into
In 1975, the mangrove forests and the adjacent land of reclaimed paddy fields, it was imperative that the effects
Bhitarkanika were declared a wildlife sanctuary encompassing of embankments and mangroves be separated. Hence, the
an area of 672 km2 , with a core area of 145 km2 being following three situations were identified: (1) a village in
designated national park. The coastline stretches 35 km the shadow of mangrove (2) a village not in the shadow of
along its eastern side, constituting the Gahirmatha Marine mangrove and having no embankment, and (3) a village not
Sanctuary (GMS). The Bhitarkanika National Park (BNP), in the shadow of mangrove, but with an embankment on the
the Bhitarkanika Wildlife Sanctuary (BWS) and parts of the seaward side.
GMS, together with 336 villages and adjacent cultivated Based on a land-use cover map prepared in a geographical
agricultural lands within the BWS, together constitute the information system domain (Fig. 1), three study villages were
BCA, an area of c. 3000 km2 (Fig. 1). The mangrove formations identified, representing the three situations. Care taken to
of the BCA were once widespread, but are now restricted to avoid variations in damage attributable to wind, water logging
the BNP, whereas the BWS has a few degraded mangroves and distance of villages from the coast and mangrove forests
and palm swamps (Badola & Hussain 2003). limited the sample size to three villages. Bankual village was in
Within the BNP the initial band of vegetation at the water’s the shadow of mangrove forest, Singidi village was neither in
edge is usually the tall Myriostachya wightiana grass, while the shadow of mangroves nor protected by embankment from
landward of this the mangrove is dominated by Avicennia storm surge, and Bandhamal village was not in the shadow of
88 R. Badola and S.A. Hussain
Table 1 Overall characteristics of the village agroecosystem in the total collapse, i.e. the sum of the damage to all the structures
Bhitarkanika Conservation Area, India. (n = 35 villages; SEM = (thatch, poles, roof, beams and walls) of the house. We used
standard error of the mean). Statistical Package for the Social Sciences (SPSS) software for
Mean SEM data processing and performed one-way ANOVA tests (Zar
Habitation (ha) 113.27 3.98 1984) to compare the means of various variables for the three
Average size of paddy fields 1.32 0.120 villages.
Overall paddy yield (kg ha−1 ) 948.83 0.56
Net area sown (irrigated, ha) 1.46 0.59
Net area sown (non-irrigated, ha) 6.44 2.61 RESULTS
No. of coconut trees/household 9.44 1.05
Income of the family (US$ yr−1 ) The villages situated around the Bhitarkanika mangrove
488.86 10.401
forests had a mean area of c. 113.27 ha per village and the
% People unemployed 13.58 0.613
economy was primarily agricultural, possessing small land
holdings and being dependent on the monsoon. The average
size of paddy fields was 1.32 ha, and the total area sown was
mangroves, but had seaward side embankment. The intensity c. 7.9 ha per village, of which only 1.46 ha was irrigated.
of the impact of the 1999 cyclone on these villages should In addition to the single crop of paddy, small quantities of
have been fairly uniform, as all the three selected villages vegetables, coconut and fish were produced. Every household
were equidistant from the seashore and had similar aspects. owned around nine coconut trees and about 38 coconuts were
The two villages outside mangrove cover were located close produced from each tree. The average family income was
low at US$ 488 yr−1 . About 13.5% people were unemployed
to each other, but both were far from the mangrove forest
in order to eliminate any effect of mangrove forest presence (Table 1). Apart from a small proportion of people engaged
(Table 1). We conducted a door-to-door survey and sampled in government service, most of the people’s livelihoods were
100% of the selected households to assess the socio-economic based on agriculture and fisheries and related business.
status of the villages, the actual damage to houses, livestock, The overall human density in the study villages was 260–
340 people km−2 , the mean household size being between 4.5
fisheries, trees and other assets owned by the people and the
rate, level and duration of flooding. To assess the type of (Bankual) and 8.2 people (Singdi) (Table 2). The literacy level
damage caused to houses, we developed a composite score or was highest for Singdi and lowest for Bankual. In Singdi and
damage rating (DR) for each of the households surveyed in the Bankual, 70% of people were engaged in agriculture, whereas
three villages. The scores were in the range of 0–19 depending in Bandhamal, 61% were labourers (Table 2). Most of the
on the intensity of damage to the house. A value of 19 signified houses (94%) were made of mud and thatch.
Table 2 General characteristics of General characterstics Villages
the three intensively studied
Singdi Bankual Bandhamal
villages in the Bhitarkanika
Conservation Area, India. Location details
* House made of brick and cement. Distance from mangrove forest (km) 9.2 0 8.2
** House made of mud and thatch. Distance from sea coast (km) 12.65 12.13 12.18
Distance from dyke (km) No dyke 2.37 0.45
Demographic characteristics
Total area (ha) 122.63 55.75 147.27
Human density (persons km2 ) 314 340 260
Number of households 58 42 56
Mean household size 8.2 4.5 6.8
Total population 353 189 383
Literacy (%) 56.7 31.2 38.6
Economic characteristics
People involved in agriculture (%) 70.6 70.6 14.4
People involved in fishing, animal 0 14.7 0
husbandry and allied activities (%)
People involved in labour (%) 22.4 2.95 61.4
People involved in other activities (%) 7.03 11.8 24.4
Type of houses
Total no. of houses (n) 37 38 32
Pucca* (%) 5.4 0 0
Pucca with thatched roof (%) 0 2.6 9.4
Partially pucca (%) 2.7 0 0
Fully kutcha** (%) 91.9 97.4 90.6
89
Valuing storm protection by mangrove forests
Table 3 Basic description and Villages
mean values of the variables (per
Variables Description Singdi Bankual Bandhamal
household) examined for
comparing the damage due to DR Damage to houses (0–19 scale) 9.40 5.34 10.44
cyclone in three study villages in PTD Tree damage (%) 21.0 3.3 15.5
the Bhitarkanika Conservation DPP Damage to other personal property (INR) 108.11 0.00 2375.00
Area, India. (US$ 1 = INR 45, DL Damage to livestock in money terms (INR) 54.05 127.63 1044.37
August 2004). FP Flooding in premises (m) 0.34 0.29 0.58
FF Flooding in fields (m) 1.99 1.09 1.39
WLF Water logging in fields (days) 9.46 5.63 12.87
CR Cost of repair and reconstruction (INR) 996.97 682.86 973.21
Yield for the year 1999 (kg ha−1 )
Y99 531 1479.5 335.9
LFS Loss of fish seedlings (fingerlings) 310.81 69.74 260.94
released prior to cyclone (INR)
TML Total quantifiable variables (INR) 1983.3 61454.13 6918.62
being highest in Bandhamal (0.6 m ± 0.05 m) and lowest for
Table 4 Results of the ANOVA for each variable and significance of
Bankual (0.3 m ± 0.04 m) (Table 3). The highest level of
their means. See Table 3 for variable definitions.
Variable n df F p value saline water intrusion in the crop fields (FF) was for Singdi,
followed by Bandhamal and Bankual. Flood water remained in
DR 107 1 14.633 0.000
PTD 93 1 9.891 0.000 fields (WLF) for longest duration in Bandhamal, flood retreat
DPP 107 1 6.814 0.002 for Singdi and Bankual being faster (Tables 3 and 4).
DL 107 1 5.398 0.006 The standing crops of paddy were severely affected by the
FP 103 1 7.670 0.001 cyclone. Crop production differed among the three villages
FF 100 1 35.102 0.000
(Table 4), Bankual having the greatest paddy yield for 1999
WLF 102 1 18.654 0.000
(Y99) of 1479.5 kg ha−1 , while in Singdi the yield was 531 kg
CR 96 1 1.270 0.286
ha−1 and in Bandhamal it was 335.9 kg ha−1 (Table 3). The
Y99 59 1 99.029 0.000
mean paddy yield differed for all three villages between the
LFS 107 1 1.506 0.227
years 1999 and 2001 (F = 99.029, df = 1, p = 0.000); in 1999
TML 98 1 17.936 0.000
it was 568 kg ha−1 while in 2001 it was 1012.7 kg ha−1 .
At the time of this study, the fishponds had not been
harvested, however, the loss to fisheries was significant because
Damage attributed to wind and storm surge
of the loss of the fingerlings released that year. The greatest
The high-speed winds and storm surge generally damaged
damage to fish seedlings per household (LFS) was in Singdi,
the mud and thatch houses, with not many cases of damage to
where INR 310.8 ± 144.97 (US$ 6.91) of seedlings released
roof frames being reported. However, about 49.5% of houses
were washed away, and the least damage was in Bankual (INR
had their roof blown away, accompanied by either cracking
69.7 ± 32.20, US$ 1.55; Table 3).
of walls or their partial collapse on some sides, the maximum
mean DR being 9.4 ± 0.7 for Singdi village and the minimum
mean DR being 5.3 ± 0.5 for Bankual village (Table 3). Mean Total monetary loss
DR to houses varied among the three villages (Table 4). The
Total losses in monetary terms were calculated for each of the
percentage of trees dying (PTD) attributed to the cyclone
households in the three villages by combining the values of
was highest in Singdi (21.0%), while only 3.3% of trees were
the cost of repair and reconstruction (CR), damage to other
damaged in Bankual (Tables 3 and 4), which had the highest
personal property such as boats, fishing nets and household
number of trees (Table 2). Costs for reconstruction work
goods (DPP), damage to livestock (DL) and loss of agricultural
per household (CR) did not differ between villages (Table
products (i.e. difference in total paddy production between
4). The highest value was INR 997.0 ± 182.18 (US$ 22.15)
2001–1999, taking the area cultivated in 1999 as the basis).
for Singdi, while the lowest was INR 682.9 ± 144.05 (US$
The loss incurred per household (TML) was highest in
15.17) for Bankual. Loss to private property such as boats,
Bandhamal (US$ 153.74) followed by Singdi (US$ 44.07) and
nets (DPP) and livestock casualties (DL) were highest in
Bankual (US$ 32.31) (Tables 3 and 4).
Bandhamal (Tables 3 and 4), the village far from the mangrove
forests but protected by the embankment (Table 2).
Attitudes and perceptions of local people
Damage attributed to saline water intrusion
When asked to rank the ecological services performed by
Flooding levels in houses and crop fields differed among mangrove forests, 89% of respondents gave the highest
villages (Table 4), saline water intrusion into houses (FP) preference to cyclone mitigation and flood control. They
90 R. Badola and S.A. Hussain
Table 5 Ranking of various Ecological functions/values Rank 1 (%) Rank 2 (%) Rank 3 (%)
functions performed by the Cyclone mitigation and flood control 88.6 11 0.4
mangrove forests by the people of Land erosion prevention 50 50 0
the Bhitarkanika Conservation Aesthetic value 38 61.2 0.8
Area, India (n = 268). Augment agricultural production 8 92 0
Contribute in fish production 1.9 96.2 1.9
Historical and cultural value 8.8 88.9 2.3
Others 18.9 70.3 10.8
Table 6 Attitudes of local people Responses (%)
towards Bhitarkanika Wildlife
Questions Yes No Indifferent
Sanctuary, India and conservation
initiatives taken by Forest Are you aware that Bhitarkanika is declared 89.6 10.4 0
Department of Government of national park and sanctuary?
Orissa (n = 268). Do you feel any sense of responsibility for 84.3 13.4 2.2
the protection of diverse flora and fauna?
Do you think your rights have been violated 18.3 72.8 9
after declaration of park?
Do you face any problems because of park? 5.6 84.7 9
Are you in favour of integrated conservation 92.9 2.2 4.9
and development projects for the area?
Would you like to cooperate with forest 43.3 23.1 36.6
department for mangrove restoration?
ranked the land erosion prevention function second (Table 5). cover. During the last century, mangroves from these areas
In the villages located far from the mangrove forest, 92.5% were destroyed or degraded by people, making these areas
of males and 97.5% of females perceived that mangroves vulnerable to the damage caused by cyclones.
were beneficial to their lives and property. The contribution Many authors have emphasized the protection from storms
of mangrove forests to increasing agricultural productivity, and cyclones that mangroves offer to coastal areas (see Carlton
as well as providing protection from storms and cyclones, 1974: Maltby 1986; Semesi 1998), however there are few
was considered most important. However, more people empirical studies that provide quantitative information on
from villages located near mangrove forests appreciated this function of mangrove forests. Although only indicative,
their contribution to agricultural productivity, while more we show that the damage attributed to the cyclone was more
people from the villages far from mangroves regarded storm extensive in villages further away from the mangrove shadow.
protection as an important contribution. About 90% people The embankments constructed in 1971 after a previous
in the area were aware that the Bhitarkanika mangrove forests cyclone to prevent intrusion of saline water into agricultural
have protected status. A high percentage (84%) of people felt fields and villages were ineffective during the high storm-
responsible for the conservation of flora and fauna, while 93% surge; in fact they acted as a barrier to run-off when the
were in favour of an integrated conservation and development water was receding. The embankments suffered a number
programme (ICDP). Approximately 43% of people were of breaches that resulted in the flooding of villages such
willing to cooperate with the forest department in mangrove as Bandhamal, which was surrounded on all sides by the
restoration. Only 18% people felt the park’s declaration embankment. Singdi village with no mangrove cover and no
violated rights, the main reason being the access denied to embankment suffered the highest level of field inundation,
firewood (Table 6). however the seawater receded quickly, resulting in less damage
to agricultural crops. Bankual village, which was in the shadow
of mangrove forest and had little embankment around it,
DISCUSSION
suffered the least. Although this study is not conclusive,
Every year about 80 tropical cyclones with winds ≥ 35 knots the lack of breaches in the embankment closer to forest is
form in the world’s waters (McBride 1995), about 6.5% of indicative of the protection provided by mangroves to the
them occurring in Bay of Bengal and Arabian Sea (Neumann embankment. In areas far from the forest, several breaches in
1993). The cyclones forming in the Bay of Bengal hit the the embankment were observed. Water levels were higher
east coast of India, particularly the states of Andhra Pradesh, and the flooding was of longer duration in Bandhamal.
Orissa and West Bengal, every year, causing heavy loss of The cyclone uprooted almost all the trees in the immediate
life and property. Along the Indian coast, all those areas that vicinity of the coast and caused much damage to trees several
are vulnerable to tropical cyclones once had natural mangrove kilometres inland. Unofficially, the damage to horticulture
91
Valuing storm protection by mangrove forests
and orchards was estimated to be INR 200 billion (Tynkkynen communities. The awareness and appreciation by the local
2000). However, mangrove forests and trees in the shadow of people of the functions performed by the mangrove forest is a
mangrove forests were intact. positive sign for conservation of the area.
We contend that the vulnerability of many coastal human
communities to cyclones is heightened by the removal of ACKNOWLEDGEMENTS
mangroves for development, agriculture and habitation. While
The India Environment Management Capacity Building
property damage from storms and hurricanes is highest in the
(EMCaB) Project, Indira Gandhi Institute of Development
developed northern nations, deaths and injury are usually
Research (IGIDR), Mumbai, provided funding support for
highest in the poor tropical and sub-tropical nations, where
this study. We thank Chief Wildlife Warden, Government
larger numbers of people are exposed to the storms (Maltby
of Orissa and Mr Anup Nayak, Divisional Forest Officer,
1986). Mangrove forests are natural buffers against storm
Mangrove Forest Division, Rajanagar, Orissa for permitting
surges (Maltby 1986), protecting tropical shores from erosion
us to carry out this research in the Bhitarkanika Wildlife
by tides and currents. Macintosh (1983) recommended that
Sanctuary. We thank Dr Hemant Kumar Sahu, Ms Poonam
a mangrove strip at least 100 m wide should be left as a
Semwal, Ms Kalpana Ambastha, Ms Shivani Chandola and
buffer zone on more exposed shores. During the present
Mr Anoop K.R. for helping us with field data collection and
study, we realized that the artificial sea defences were not only
analysis.
expensive to build and repair, but they were also, in many
cases, ineffective. Extensive Casuarina plantations established
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