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Paper Information

Journal:   ENVIRONMENTAL SCIENCES   WINTER 2009 , Volume 6 , Number 2; Page(s) 11 To 20.
 
Paper: 

COMPARISON BETWEEN TWO CASPIAN ZOOPLANKTON; INVASIVE MNEMIOPSIS LEIDYI AND ACARTIA TTONSA IN SENSITIVITY TO OIL POLLUTION

 
 
Author(s):  ABTAHI BEHROUZ*, BARAZANDEH M., ESMAEILI SARI ABAS, JAVANSHIR KHOUEI ARASH
 
* DEPARTMENT OF MARINE BIOLOGY, FACULTY OF BIOLOGICAL SCIENCES, SHAHID BEHESHTI UNIVERSITY, G.C. TEHRAN, IRAN
 
Abstract: 

Mnemiopsis leidyi which belongs to the Phyhnn Ctenophora has caused many ecological problems after entering the Caspian Sea. It seems that the high decrease in Kilka, Sturgeon fishes and Phoca population is related to the distribution of this Ctenophore in most regions of the Caspian Sea. So it seems necessary to know about all biological and ecological features of M leidyi. In this study the acute toxicities of the Water Accommodated Fraction (WAF) of the crude oil to Mnemiopsis leidyi and Acartia lonsa were determined and· their LC50 for 96h were compared. The experiment trials in 3 replicates was carried out in static system using similar bottles containing 1 liter filtered seawater and 10 individuals. The Pharmacologic Calculation System program was used to determine LC50. According to the results the LC50 was 3.311 and 0.148 ml.lit-1 respectively for M leidyi and A. tansa. It can be concluded that the invasive comb jelly (M leidyi) is significantly more resistant to WAF of the crude oil than Acartia lonsa. This study indicates that high resistance of Mnemiopsis leidyi to the marine pollutants in comparison with other marine zooplankton may facilitate the distribution of this animal in the Caspian Sea.

 
Keyword(s): CASPIAN SEA, CRUDE OIL, LC50, WAF, ZOOPLANKTON SURVIVE
 
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