Phytoplankton Population Changes in Lake Urmia During Dry and Wet Periods

Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_PHYCLG-3-2_005

تاریخ نمایه سازی: 23 شهریور 1400

Abstract:

Hypersaline environments are important natural assets that have significant economic, ecological, scientific and natural value. Management and protection of these variable ecosystems depend on understanding the influence of salinity on biological productivity and community structure. The object of the present study is to investigate the relationships between two basic components in Urmia Lake i.e. microalgae and physico-chemical parameters, particularly salinity level in order to provide a better understanding dynamics of this unique ecosystem. ۳ sampling sites were selected in north and south of Urmia Lake. Samplings (۲ samples in each site) were carried out monthly from April ۲۰۱۸ to October ۲۰۱۹. Water level, salinity, Electrical Conductivity (EC), Total Disolved Solids (TDS), pH, transparency phosphate and nitrate (PO۴-۳ and NO۳-) were analyzed. phytoplankton species composition and density were also determined. Statiscal analysis were performed by PAleontological STatistics (PAST) version ۳.۰۴. Totally, seven algal species were identified in Urmia Lake in this study. Bacillariophyta with ۵ species was the most abundant algal group in the lake. Chlorophyta and Cyanobacteria both had ۱ species, however, Dunaliella salina as the only representative of green alga alone composed about ۹۹.۵ percent of total algal density of Urmia Lake. This study indicated that salinity, TDS and EC have the highest effects on phytoplankton population structure and Dunaliella spp. dominance in Urmia Lake. However, other factors such as PO۴-۳ and NO۳- might have been masked by three main factors.

Authors

Fereidun mohebbi

Iranian Artemia Research Center, Iranian Fisheries Science Research Center, Urmia, Iran

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