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:: Volume 11, Issue 4 (10-2012) ::
IJFS 2012, 11 Back to browse issues page
State of Mnemiopsis leidyi (Ctenophora: Lobata) and mesozooplankton in Iranian waters of the Caspian Sea during 2008 in comparison with previous surveys
S. Bagheri * , U. Niermann , J. Sabkara , A. Mirzajani , H. Babaei
, siamakbp@gmail.com
Abstract:   (5998 Views)
 

Mnemiopsis leidyi which was accidentally introduced into the Caspian Sea in 1999 and since then has colonized extensively. The horizontal distribution of M. leidyi and dominant mesozooplankton species was investigated in the south western Caspian Sea during February, May, July and November 2008. The average number and biomass of M. leidyi were in the same range (ca 200 individuals.m-3 (2000 ind.m-2) and 16 g wet weight.m-3 (180 g.m-2) in comparison with previous surveys. As in previous years the population consisted mainly of individuals <1 cm. The decline in mesozooplankton species observed since 1996 continued in 2008. Only two species of the previously recorded 24 Cladocera species were found in 2008. Of five Copepoda species recorded in 1996, only one, Acartia tonsa, was found in 2008 and even here adult individuals have reduced 3-fold since 1996. Bivalve larvae have declined by one order of magnitude since 1996. Among the dominant species, only the numbers of Cirripedia larvae and in part the numbers of Pleopis polyphemoides (Cladocera) were in the same range as in 1996.

 
Keywords: Mnemiopsis leidyi, Acartia tonsa, Mesozooplankton, Long-term fluctuation, Caspian Sea
Full-Text [PDF 909 kb]   (2433 Downloads)    
Type of Study: Orginal research papers | Subject: Ecology
Received: 2012/11/15
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Bagheri S, Niermann U, Sabkara J, Mirzajani A, Babaei H. State of Mnemiopsis leidyi (Ctenophora: Lobata) and mesozooplankton in Iranian waters of the Caspian Sea during 2008 in comparison with previous surveys. IJFS. 2012; 11 (4) :732-754
URL: http://jifro.ir/article-1-734-en.html


Volume 11, Issue 4 (10-2012) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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