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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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