How phytoplanktons are useful in environment impact assessment?
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The influence of various factors on the seasonal appearance of phytoplankton differs significantly, with physical factors (such as temperature and light intensity) being the most important and chemical (DO, pH, salinity, total hardness, EC and nutrient level) being of lesser importance (Reynolds, 1984). Moreover, because our knowledge is limited, the behavior of algal population can sometimes be unpredictable (Mur, 1997; Pongswat et al., 2000).
Millie et al. (2009) characterize phytoplankton composition/abundance and the environmental conditions influencing communities during late-Summer, a period when bloom proliferation typically is greatest throughout the basin-western Lake Erie.
Increasing of freshwater biodiversity due to the increase in nutrient concentration had been discussed in different studies (Leibold, 1999; Dodson et al., 2000; Dudgeon et al., 2006). This fact was already pointed out in studies conducted in Iranian inland waters (Shadkam, 2005; Farahani et al., 2006); however, long-term studies on biodiversity changes due to eutrophication are still unavailable for these waters.
Furthermore, clearly study of shallow lakes concerning the behavior of abiotic and biotic factors is of particular importance, this kind of knowledge may be a useful arrangement and restoration tool. As Salm et al. (2009) believe, understanding phytoplankton community structure provides insight into the overall ecology of lakes and will assist in the future conservation and management of these valuable and climatically-sensitive systems.
According to Adirondack Ecologists (2010)abundance and species composition of algae can have significant implications with regard to both the water clarity and quality of any given body of water. The other hand, Lathrop et al. (1998) argued the public’s perception of water quality in lakes is often associated with the frequency of algal blooms and prediction of these extreme events is inherently probabilistic.
Since, data on the phytoplankton and the physicochemical features of Kaftar Lake are lacking completely. This study was carried out in order to determine some physical-chemical features of water as well as the phytoplankton distribution and diversity of in this Lake.
Seasonal fluctuations in density and composition of five classes of phytoplankton (Chlorophyceae, Cyanophyceae, Bacillariophyceae, Zygnemophyceae and Fragilariophyceae) identified in the Kaftar Lake in relation to the environmental factors are described in the present study.
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