Disclaimer note - WWF - Pakistan
Disclaimer note - WWF - Pakistan
Disclaimer note - WWF - Pakistan
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Detailed Ecological Assessment Report 2008 – Keenjhar Lake<br />
Figure 17 – Number of species in each phylum during the summer and winter<br />
surveys<br />
Number of species<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
Cyanophyta<br />
Volvocophyta<br />
Dinophyta<br />
Bacillariophyta<br />
Xanthophyta<br />
Phylum<br />
Euglenophyta<br />
Chlorophyta<br />
Charophyta<br />
Summer<br />
Winter<br />
3.6.5 Discussion<br />
During the two surveys carried out between 11 to 13 June 2007 and 8 - 11<br />
November 2007, a total of 76 samples were collected. In the summer 26<br />
algal/phytoplankton samples were collected out of which 39 algal species<br />
belonged to 30 genera of 6 phyla (Cyanophyta, Volvocophyta, Bacillariophyta,<br />
Xanthophyta, Dinophyta, Euglenophyta and Chlorophyta). In the winter survey a<br />
total of 50 algal samples were collected; out of which 150 algal/phytoplankton<br />
species belonged to 65 genera of 8 phyla namely Cyanophyta, Volvocophyta,<br />
Dinophyta, Bacillariophyta, Xanthophyta, Euglenophyta, Chlorophyta and<br />
Charophyta. Overall the winter flora results proved to be more satisfactory<br />
compared with the summer flora results. In the winter months low tides and<br />
turbidity was observed. There was no evidence of floods or rain in the site area.<br />
Various birds and fish were present due to the presence of rich algal and<br />
phytoplankton flora. The physico – chemical factors were found to be favorable<br />
along with the climatic and environmental conditions for the growth of aquatic<br />
fauna and flora including fish species. However, the salinity in the area is on the<br />
rise due to lack of management and fresh water.<br />
3.6.6 Threats and recommendations<br />
No specific threats or recommendations were given by the consultant. However it<br />
was pointed out that the main factor affecting phytoplankton growth and<br />
production is salinity. Due to the lack of fresh water salinity in the surrounding<br />
areas has increased especially in the regions of Thatta and Badin. The rapid<br />
increase in salinity has caused a decrease in phytoplankton and algae<br />
production. Some other factors include high tides, turbidity, rain and floods<br />
causing a steep decline in vegetation growth. A major problem in the area is<br />
<strong>WWF</strong> <strong>Pakistan</strong> – Indus for All Programme Page 102 of 188
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