EFFECT OF MNEMIOPSIS LEYDEI ON BIOMASS OF FIVE COMMERCIAL FISH SPECIES IN THE SOUTHERN PART OF THE CASPIAN SEA

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FAZLI HASAN; NASROLAHZADEH HASAN; PORRANG NIMA; ROHI ABOLGHASEM; ESLAMI FERESHTEH

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Journal: JOURNAL OF MARINE BIOLOGY Year:2015 | Volume:7 | Issue:25 Page(s): 23-34

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Title

EFFECT OF MNEMIOPSIS LEYDEI ON BIOMASS OF FIVE COMMERCIAL FISH SPECIES IN THE SOUTHERN PART OF THE CASPIAN SEA

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Keywords

MNEMIOPSIS LEYDIQ3

ECOSYSTEM FUNCTIONQ2

FISH BIOMASSESQ2

CASPIAN SEAQ2

Abstract

In recent decades, due to fluctuations in Seae water levels, environmental pollutions, and invader species invasion, the ecosystem of the CASPIAN SEA has been changed. In this study, assessing impact on ECOSYSTEM FUNCTIONs was conducted according to the new invader species (Mnemiopsis leidyi) using biomass of commercial fish species during three periods: 1996-2000, 2001-2006 and 2007-2011; in three phases of the invasion: establishment, expansion and adjustment, respectively. The results showed that the total biomass of anchovy Kilka (Clupeonella engrauliformis) declined from 185000 tons in 1996 to 158000 tons in 1999 and collapsed to 200 tons in 2011. Also the biomass of big eye kilka (C. grimmi) decreased from 50000 tons in 1996 to less than 6000 tons in 2001. But the biomass of common kilka (C. cultriventris) had an increasing trend from 20000 tons in 1996 to more than 110000 tons in 2009. The biomass of two benthic feeder species (Rutilus frisii kutum and Liza aurata) had the same trend changes as first the biomasses had an increasing and then decreasing trend. During three periods, ECOSYSTEM FUNCTIONs had changes. The ECOSYSTEM FUNCTIONs were shifted E0 (No impact) in first period to E2 (moderate impact) and E3 (strong impact) in the second and third periods. Loss functions of two keystone species (anchovy and big eye Kilka) could causes the sharp decline in upper layer of food web chain, i.e. sturgeons and CASPIAN SEAl in the CASPIAN SEA.

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APA: Copy

FAZLI, HASAN, NASROLAHZADEH, HASAN, PORRANG, NIMA, ROHI, ABOLGHASEM, & ESLAMI, FERESHTEH. (2015). EFFECT OF MNEMIOPSIS LEYDEI ON BIOMASS OF FIVE COMMERCIAL FISH SPECIES IN THE SOUTHERN PART OF THE CASPIAN SEA. JOURNAL OF MARINE BIOLOGY, 7(25), 23-34. SID. https://sid.ir/paper/174581/en

Vancouver: Copy

FAZLI HASAN, NASROLAHZADEH HASAN, PORRANG NIMA, ROHI ABOLGHASEM, ESLAMI FERESHTEH. EFFECT OF MNEMIOPSIS LEYDEI ON BIOMASS OF FIVE COMMERCIAL FISH SPECIES IN THE SOUTHERN PART OF THE CASPIAN SEA. JOURNAL OF MARINE BIOLOGY[Internet]. 2015;7(25):23-34. Available from: https://sid.ir/paper/174581/en

IEEE: Copy

HASAN FAZLI, HASAN NASROLAHZADEH, NIMA PORRANG, ABOLGHASEM ROHI, and FERESHTEH ESLAMI, “EFFECT OF MNEMIOPSIS LEYDEI ON BIOMASS OF FIVE COMMERCIAL FISH SPECIES IN THE SOUTHERN PART OF THE CASPIAN SEA,” JOURNAL OF MARINE BIOLOGY, vol. 7, no. 25, pp. 23–34, 2015, [Online]. Available: https://sid.ir/paper/174581/en

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