Phytoplankton parameters in the Large Aral Sea in June 2008

Species composition, abundance, and biomass of phytoplankton in the surface water layer were determined at 10 stations in the central part of the Western Basin (WB) and at one station in the Eastern Basin (EB) of the Large Aral Sea. 42 algal species were found. Diatoms had the highest number of species. Similarity of phytoplankton composition in the WB was high, whereas phytoplankton composition in the WB and EB differed significantly. In WB abundance and biomass of phytoplankton varied from 826x10**3 to 6312x10**3 cells/l (aver. 1877x10**3 cells/l) and from 53 to 241 ?g C/l (aver. 95 ?g C/l). In EB the phytoplankton abundance was 915x10**3 cells/l and 93 ?g C/l. Vertical distribution of phytoplankton in upper 35 m was investigated at one station in WB. Maximum values of phytoplankton abundance and biomass were recorded under the thermocline at 20 m depth. Integrated biomass of phytoplankton was 14 g C/m**2.

在大咸海（Large Aral Sea）西部盆地（Western Basin, WB）中部的10个站点及东部盆地（Eastern Basin, EB）的1个站点，测定了表层水层浮游植物的物种组成、丰度和生物量。共发现42种藻类。硅藻（diatoms）的物种数量最多。WB内浮游植物组成的相似性较高，而WB与EB之间的浮游植物组成存在显著差异。WB中浮游植物的丰度范围为826×10³至6312×10³细胞/升（平均值1877×10³细胞/升），生物量范围为53至241微克碳/升（μg C/L，平均值95微克碳/升）。EB中浮游植物的丰度为915×10³细胞/升，生物量为93微克碳/升。在WB的1个站点，调查了上层35米水层中浮游植物的垂直分布。浮游植物丰度和生物量的最大值记录于温跃层（thermocline）以下20米深度处。浮游植物的综合生物量为14克碳/平方米（g C/m²）。