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Detailed Ecological Assessment Report 2008 – Keenjhar Lake
3.3.3 Species diversity
Figures 6 and 7 give details of the species diversity and evenness of reptiles and
amphibians over summer and winter.
Figure 6 – Evenness of reptile and amphibian species at Keenjhar Lake
0.79
0.78
0.77
0.76
0.75
0.74
0.73
0.72
Summer Winter
Evenness
Figure 7 – Shannon and Margalef diversity index for reptiles and amphibians
3.5
3
2.5
2
1.5
1
0.5
0
Summer Winter
Shannon Index
Margalef Index
In can be inferred that species diversity over summer and winter are quite similar.
However evenness is much less in winter, which given the nature of reptiles
(being cold-blooded) is acceptable.
3.3.4 Threat and recommendations
3.3.4.1 Threats
• The lake is facing the scarcity of freshwater over the years due to which
the population of freshwater turtles is adversely affected, thus the natural
balance of aquatic ecosystem is disturbed;
WWF Pakistan – Indus for All Programme Page 46 of 165