Dr. Hassan N Saravi

Dr. Hassan N Saravi |Clyto Access

Caspian Sea Ecology Research Center, Iran

Keynote Speaker

Expertise: Ecology, Limnology And Pollution

Biography:

Hassan Nasrollahzadeh Saravi has been working in a Research center since 1993. He is the Head of Pollution Group at his Company (Caspian Sea Ecology Research Center, CSERC). His scope is regarding Ecology and Pollution.  He was graduated in Environmental Biology at Ph.D. program in University Science Malaysia (USM) in 2008. He had published 35 international and ISI papers. He also published more than 180 papers at national and international conferences. He was involved in 70 research projects as a manager and co-worker regarding Ecology, Pollution at Ponds, Rivers, lagoon and the Caspian Sea. He was selected as an academician of Iranian Academy of Sciences in 2010 and 2012.He is a part-time lecturer at a university regarding Ecology, Limnology and pollution courses. He supervised more than 20 students as a supervisor and co-supervisor at M.Sc. and Ph.D. program.

Presentation:

Title: Trophic status of Caspian Sea based on environmental parameters and phytoplankton diversity during Nodularia spumigena bloom event and Mnemiopsis leidyi Invasion

Abstract:

This study investigated environmental parameters and biological data of the Southern Caspian Sea (SCS) during a long-term study (1996-2014), including phases before and after invasion by the alien species (Mnemiopsis leidyi).  The status of the marine coastal waters of the SCS was assessed using the TRIXCS, OECD, EEA and other indicators in line with biological indicators such as the Shannon–Weaver index. Nutrient concentrations (DIN, DIP), Chl-a and aDO% differed significantly (p<0.01) between the two phases with higher values recorded after the introduction of M. leidyi. The Shannon–Weaver index was higher after the introduction of M. leidyi. Although the various indices and indicators used to classify the trophic status of the Iranian coastal waters of the CS did not always achieve the same trophic status, but an overall analysis of the water parameters and biological factors pointed out to a high to good status for before and moderate status for after introduction of M. leidyi. These findings are consistent to in the Black Sea where the ctenophore M. leidyi was introduced in the 1980s, and thus this condition could be considered as a form of ‘‘biological contamination’’.
Phytoplankton community structure changed significantly with a shift in dominance and fading of some species. Nodularia spumigena bloom event was also recorded in summertime of 2005, 2009 and 2010. In the Iranian waters it was found that phytoplankton assemblage comprised of 46 species following the bloom. Bacillariophyta had the highest number of species (17) follow by Pyrrophyta (14), Cyanophyta and Chlorophyta (6) and Euglenophyta (3). But, phytoplankton species of the bloom samples is classified in three groups: Cyanophyta, Pyrrophyta and Bacillariophyta with Cyanophyta being dominant with at least 98% and 96% of phytoplankton abundance and biomass, respectively. Taken together, the pattern of the dominant and frequent species in the Caspian Sea indicated that the health of the water body and aquatic organisms are at risk.

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