Composition and Diversity Variation of Avifauna, along Different Vegetative Habitat Types in a Human-Modified Area, University of Kelaniya, Sri Lanka
Table 4
Final output of the PCA of abundance of birds’ species recorded in different habitat types in University of Kelaniya. Cumulative % variations of only the PC1 and PC2 are shown. A considerable cumulative percentage as 67% of the total variation among abundance of bird species is explained by PC1 and PC2 axis.
(a) Eigenvectors (coefficients in the linear combinations of variables making up PCs)
Variable
PC1
PC2
Asian brown flycatcher
-0.061
0.121
Asian koel
-0.055
0.263
Asian paradise flycatcher
-0.162
-0.058
Barn swallow
-0.029
0.118
Black hooded oriole
-0.281
0.01
Black-headed munia
0.135
-0.126
Black-rumped flame back
-0.268
-0.088
Blue tailed bee-eater
-0.246
-0.152
Brahminy kite
-0.018
0.257
Brown shrike
-0.27
-0.11
Brown-breasted flycatcher
0.135
-0.126
Brown-headed barbet
-0.123
0.2
Cattle egret
0.135
-0.126
Common myna
-0.235
-0.013
Common tailorbird
-0.069
0.185
Crimson-fronted barbet
-0.051
0.222
Feral pigeon
0.139
0.05
Forest wagtail
-0.018
0.257
Great tit
0.007
0.269
Greater coucal
0.141
-0.165
Green imperial pigeon
0.071
0.071
House swift
-0.278
-0.07
House crow
0.165
-0.183
Jungle crow
0.06
0.17
Lesser hill myna
-0.221
0.112
Loten’s sunbird
0.012
0.227
Oriental white-eye
-0.267
-0.08
Oriental magpie robin
0.13
0.051
Pale-billed flower pecker
0.013
0.22
Purple-rumped sunbird
0.082
0.19
Red-vented bulbul
0.12
-0.078
Rose-ringed parakeet
-0.136
-0.063
Scaly-breasted munia
-0.181
-0.221
Shikra
0.141
-0.165
Small minivet
-0.018
0.257
white rumped munia
-0.252
-0.048
Spotted dove
-0.167
-0.164
White bellied drongo
-0.063
-0.052
White throated kingfisher
-0.227
0.038
Yellow billed babbler
-0.136
0.187
(b) Eigenvalues
PC
Eigen values
%Variation
Cumulative % Variation
1
10.93
36
36
2
9.19
31
67
3
6.41
18.2
85.2
4
4.47
10.8
95.2
(c) Principal component scores
Sample
SCORE 1
SCORE 2
SCORE 3
SCORE 4
Saiba ground (Open ground)
-7.315
-2.500
1.243
-0.075
Gym canteen premises (Low wooded)
-0.030
-1.555
-2.884
0.030
Medical center area (Highly wooded)
1.374
1.191
-0.337
2.254
Mee amba sevana (Highly wooded)
-0.498
5.843
2.771
0.585
Girls’ hostel complex (Low wooded)
3.655
-2.875
3.670
-2.808
Management and IT premises (Moderately wooded)
2.246
-0.756
-2.490
0.250
English language training unit (Moderately wooded)
