International Journal of Molecular Evolution and Biodiversity 2016, Vol. 6, No. 1, 1-12
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seasons. The riverine forest and wetland supported the least diversity of avian during the wet (H’= 2.93) and dry
(H’= 3.07) seasons respectively. The highest and the lowest even distribution were observed in woodland during
both wet (E=0.94) and dry (E=0.95) seasons (table 1).
Table 1 Species richness, evenness and diversity indexes among the three habitats in different seasons
Habitat
Season
Species richness
Abundance
H’
H’ max
Evenness
Wetland
Wet
41
4540
2.93
3.71
0.79
Dry
48
5408
3.07
3.87
0.79
Both
47
4994
3.71
3.85
0.95
Woodland
Wet
67
8993
3.96
4.20
0.94
Dry
49
5067
3.71
3.89
0.95
Both
87
10536
4.01
4.47
0.89
Riverine forest
Wet
33
7601
3.09
3.49
0.88
Dry
47
5448
3.15
3.85
0.82
Both
53
8411
3.20
3.97
0.80
3.3 Species similarity
The highest similarity of bird species (SI=0.92) within the same habitat between wet and dry seasons was
observed in the wetland followed by riverine forest (SI=0.68). The similarity of bird species between wet and dry
seasons was the least in woodland (SI=0.5) (Table 2).
Table 2 Seasonal species similarity (SI) within the same habitat
Habitat
Wet
dry
Number of common species
SI
Wetland
41
48
41
0.92
Woodland
67
49
29
0.5
Riverine forest
33
47
27
0.68
Among the three habitat types, similarity of birds species was the highest between woodland and riverine forest
during both during the dry (SI=0.31) and wet (SI=0.44) seasons. The combined data of wet and dry seasons also
showed high similarity between bird species of woodland and riverine forest (SI=0.76) (Table 3).
3.4 Abundance
During the wet season, 20, 11 and 7 species were uncommon and 16, 33 and 9 species were frequent in the
wetland, woodland and riverine forest respectively. During the dry season, 23, 8 and 20 species were uncommon
and 8, 3 and 11 species were common in the wetland, woodland and riverine forest respectively. In both seasons,
there were no rare species and 2 abundant species were recorded during the wet season from the riverine forest
(Table 4).
