Correlation of biotic and abiotic parameters by principal component analysis method in the southern region of the Caspian Sea
Subject Areas : New Technologies in Aquaculture Development
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Keywords: Zooplankton, Phytoplankton, Keywords: Caspian Sea, Mnemiopsis leidyi, Physico-chemical parameters,
Abstract :
The biological organisms (phytoplankton, zooplankton, Macrobenthos and ctenophore Mnemiopsis leidyi) along with some non-biological factors (Physico-chemical parameters and pollutants) of water were investigated in the Caspian Sea during 2007-2008. The sample station was located between 48° to 54° longitude and 36° to 39° latitude. The samples were gathered in four seasons and eight transects (half-line perpendicular to the coast) in Astara, Anzali, Sefidrud, Tonekabon, Noshahr, Babolsar, Amirabad and Turkmen. Sampling was done of 5, 10, 20, 50 and 100 M depth of different layers. Nonparametric test and multivariate analysis (PCA) were run. The results showed that some water physico-chemical factors including organic nitrogen, inorganic nitrogen (ammonium), salinity, water temperature were more important than other factors. Also, the abundance and biomass of M. leidyi depended on water temperature and nitrogen compounds, which have resulted in a change in abundance, biomass and species composition of marine plankton. So that the number of zooplankton species before the arrival of M. leidyi was 50 species, and only 10 species were observed in this study.
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