Environmental Engineering Reference
In-Depth Information
Table 1 Appraisal of mangrove status and condition in the Greater Amanzule wetlands (based on 18 mangrove sites), Ghana
Assessment criteria
Ranked category
Number
of sites
Percentage
Mangrove type
Estuarine
11
61.1
Lagoonal
7
38.9
Mangrove areal extent (ha)
0-10
9
50.0
10-50
1
5.6
50-100
3
16.7
100 ha and above
5
27.8
Mangrove canopy height (m)
Less than 10
1
5.6
10-20
1
5.6
20-30
11
61.1
30 and above
5
27.8
Tidal dynamics
Very good (very free tidal flow throughout the year)
6
33.3
Good (partially blocked in some periods of the year)
8
44.4
Limited (blocked in some periods of the year)
3
16.7
Very limited (blocked throughout the year)
1
5.6
Biodiversity status (presence of large mammals
especially monkeys within the day)
Many usually seen (more than 10 animals)
3
16.7
Few usually or occasionally seen (less than 10 animals)
1
5.6
Not/rarely seen
14
77.8
Health status (visual average proportion of yellow
foliage or dead leaves, roots and stems in a given
mangrove site)
Very healthy(less than 10 %)
5
27.8
Healthy (10-30 %)
8
44.4
Partly degraded (30-50 %)
3
16.7
Degraded/polluted from waste disposal/mining (more than
50 %)
2
11.1
Main adjoining vegetation
Raphia swamps and other marshes
3
16.7
Cropland
1
5.6
Coconut plantations
11
61.1
Others
3
16.7
Population around mangroves (number of people)
Less than 500
10
55.6
500-1,000
4
22.2
1000-5,000
3
16.7
5000 and above
1
5.6
Community perception of trends in mangrove area
change (over the last 20 years)
Increasing
1
5.6
Stable
8
44.4
Decreasing
9
50.0
Main activity within mangrove area
Farming
2
11.1
Fishing
9
50.0
Urbanization
7
38.9
Current threats
Noncutting (deliberate decision not to cut) or prohibited
cutting(by customary laws with fines to defaulters or by
conservation organizations)
11
61.1
Wood collection (for fuelwood, charcoal, construction, etc.)
4
22.2
Mouth closure due to sedimentation
1
5.6
Pollution (in situ pollution, waste disposal/mining activities)
2
11.1
Past or current conservation or any intervention
efforts by NGOs or partners
Present
7
38.9
Not present
11
61.1
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