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34
3.6
Understanding the Relative Shares of Coastal Ecosystem
Services
According to the GCLME and CCLME studies, coastal
ecosystems from these regions provide an estimated
economic impact of US$ 4.2 billion, excluding the
approximations of the coastal tourism impact of US$
720.8 million for the GCLME and the “coastal and ocean
opportunities for tourism” impact of US$ 4.68 billion for the
CCLME.
192
Fish nurseries, with an estimated impact of US$
1.8 billion, and coastal protection, with an estimated value
of US$ 1.7 billion, are the most significant coastal ecosystem
services for west and central African coastal populations
(Figure 22 and appendix G).
193
The GCLME use values of timber and non-timber products,
sewage treatment, drinking water, coastal protection and
carbon sequestration, combined with the economic impacts
of fish nurseries, biodiversity and cultural services, total
US$ 2.7 billion.
194
The CCLME use values of timber and non-
timber products, sewage treatment, coastal protection and
carbon sequestration, combined with the economic impacts
of mangrove and seagrass fish nurseries, biodiversity and
cultural services, total US$ 1.5 billion.
195
When examined separately, for each of the GCLME and
CCLME, coastal protection, fish nurseries and carbon
sequestration have the greatest monetary impact (excluding
tourism) (Figure 23 and 24 and appendix G).
196
Interwies
(2011) approximates the value of mangroves for 50 years,
concluding that [no quotation] one hectare of destroyed
GCLME mangroves accounts for at least US$ 32,000 (4
per cent discount rate) considering the estimated TEV of
mangroves for the next 50 years.
197
Likewise, for the CCLME,
the destruction of one hectare of mangroves costs roughly
US$ 2,235/ha per year.
198
Biodiversity &
Cultural
Services, $55
Timber
Products,
$26
Timber
$
Fish
Nursery,
$1,836
e ,
Costal
Protection,
$1,735
l
DrinkingWater,
$10
Sewage
Treatment,
$63
Non-Timber
Products,
$143
1
Carbon
Sequestration, $374
Timber
Products,
$8
Seagrass
Fish
Nurseries,
$43
Nurseries,
Seagrass
Biodiversity &
Cultural
Services,
$2
Seagrass
Biodiversity &
l
$2
Mangrove
Biodiversity &
Cultural
Services,
$15
Mangrove
Biodiversity &
$15
Mangrove
Fish
Nurseries,
$281
Fish
$281
Costal
Protection,
$884
Sewage
Treatment,
$20
a
Non-Timber
Products,
$45
Carbon
Sequestration,
$221
Timber
Products,
$18
Biodiversity,
$19
Cultural
Services,
$19
Fish
Nursery,
$1,513
Costal
Protection,
$851
Sewage
Treatment,
$43
Drinking
Water,
$10
Carbon
Sequestration,
$153
Non-Timber
Products,
$99
Figure 22:
Economic Shares of the GCLME and CCLME
Coastal Ecosystems (US$ millions per year).
Source: Interwies (2011) and Interwies and Görlitz (2013).
Figure 24:
Economic Shares of the CCLME Coastal Ecosystems
(US$ millions per year).
Source: Interwies and Görlitz (2013).
Figure 23:
Economic Shares of the GCLME Coastal Ecosystems
(US$ millions per year).
Source: Interwies (2011).