Impact of a new invasive ctenophore (Mnemiopsis leidyi) on the zooplankton community of the Southern Caspian sea

Roohi, Abolghasem
Yasin, Zulfigar
Kıdeyş, Ahmet Erkan
Hwai, Aileen Tan Shau
Khanari, Ali Ganjian
Eker-Develi, Elif
The invasive ctenophore Mnemiopsis leidyi (Agassiz), which was transported from the Black Sea into the Caspian Sea at the end of the 1990s, has negatively affected the ecosystem of the Caspian Sea. Zooplankton abundance, biomass and species composition were evaluated on the Iranian coast of the Caspian Sea during 2001-2006. A total of 18 merozooplankton (13 species composed of larvae of benthic animals) and holozooplankton (four Copepoda and one Cladocera) species were identified. The total number of zooplankton species found here was 50% less than in a previous investigation performed in the same region in 1996 before the introduction of Mnemiopsis leidyi into the Caspian Sea. Cladocera species seemed to be highly affected by the invasion of Mnemiopsis leidyi; only one species, Podon polyphemoides, remained in the study area, whereas 24 Cladocera species were found in the study carried out in 1996. Whereas among the Copepoda Eurytemora minor, Eurytemora grimmi, Calanipeda aquae dulcis and Acartia tonsa that were abundant before the Mnemiopsis leidyi invasion, only A. tonsa (copepodites and adults) dominated the inshore and offshore waters after the invasion. The maximum in zooplankton abundance (22,088 +/- 24,840 ind.m(-3)) and biomass (64.1 +/- 56.8 mg.m(-3)) were recorded in December 2001 and August 2004, respectively. The annual mean zooplankton abundance during 2001-2006 was in the range of 3361-8940 ind.m(-3); this was two- to five-fold less than the zooplankton abundance in 1996. During 2001-2006, the highest abundance and biomass of Mnemiopsis leidyi were observed during summer-autumn months coincident with warm temperatures and generally when the abundance of other zooplankton organisms was low.


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Roohi, A.; Kıdeyş, Ahmet Erkan; Fazlı, H. (2003-01-01)
The alien ctenophore Mnemiopsis leidyi which was transported from the Black Sea into the Caspian Sea at the end of 1990s has been negatively affecting ecosystem in this new environment. In this study, spatial and temporal distribution of M.leidyi were studied from a total of stations located along three transects (Amirabad, Babolsar and Nowshar) in the Eeastern Iranian coasts of the Caspian Sea (Mazandaran province) during July 2001 to November 2002. M. leidyi acheived maximum biomass 1024.5 g/m2 in August-...
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Kıdeyş, Ahmet Erkan; Bingel, Ferit; Niermann, Ulrich (1999-12-01)
Recent events in the Black Sea have had a severe impact on all compartments of the ecosystem, including ichthyoplankton. The distribution of eggs and larvae of the anchovy, the major commercial fish species, was investigated in relation to ambient conditions in the southern Black Sea during July 1992, August 1993, and June-July 1996. Average highest egg and larva numbers were observed in June-July 1996, Ichthyoplankton distribution was closely connected with the hydrography. Besides surface temperature and ...
Factors Influencing the Invasion of the Alien Ctenophore Mnemiopsisleidyi Development in the Southern Caspian Sea
Roohi, Aboulghasem; Pourgholam, Reza; Khenari, Ali Ganjian; Kıdeyş, Ahmet Erkan; Sajjadi, Ameneh; Kalantari, Ramin Abdollahzade (2013-11-01)
Mnemiopsis leidyi population activities first were recorded during the coastal observations in 2001 in which its population considerably increased afterward and now sustained the southern Caspian Sea. Maximum summer-autumn M. leidyi abundance was recorded in euphotic layer in 2002 (851±85 ind.m-3) and maximum biomass was in 2001 with 48.1±14.4 g.m-3) while minimum were in aphotic layer. In years 2003 to 2011, M. leidyi abundance and biomass sharply declined to 1-843 ind.m-3 and 0.07-37.7 g.m-3, respectively...
Feeding, respiration and growth of ctenophore Beroe cf ovata in the low salinity conditions of the Caspian Sea
Kıdeyş, Ahmet Erkan; Anninsky, BE; Shiganova, TA; Roohi, A; Tabari, MR; Youseffan, M; Rostamiya, MT (2004-01-01)
The ctenophore Beroe cf ovata, which spontaneously entered the Black Sea in the 1990s and suppressed the previous ctenophoran invader Mnemiopsis leidyi by its predatory impact, is currently considered for intentional introduction to the Caspian Sea as well. In order to assess its impact on Mnemiopsis in the Caspian, Beroe was transported during 2002 from the Black Sea and the Bosporus to the Khazerabad laboratory (Mazandaran), on the Caspian coast of Iran, where experiments on its survival in Caspian water,...
Physiological characteristics of the ctenophore Beroe ovata in Caspian Sea water
Kıdeyş, Ahmet Erkan; Anninsky, BE; Shiganova, TA; Roohi, A; Tabari, MR; Youseffyan, M; Rostamian, MT; Rostami, H; Negarestan, H (2004-01-01)
Riparian countries of the Caspian Sea have been evaluating the pros and cons of the predatory ctenophore Beroe ovata as a control agent against the invasive ctenophore Mnemiopsis leidyi, which has enormous adverse impacts on the fishery resources as well as on the biodiversity in this once fertile sea. To assess the viability of B. ovata establishment in the Caspian Sea, the survival and some physiological characteristics (feeding, respiration, reproduction and growth) of the predatory ctenophore were studi...
Citation Formats
A. Roohi, Z. Yasin, A. E. Kıdeyş, A. T. S. Hwai, A. G. Khanari, and E. Eker-Develi, “Impact of a new invasive ctenophore (Mnemiopsis leidyi) on the zooplankton community of the Southern Caspian sea,” MARINE ECOLOGY-AN EVOLUTIONARY PERSPECTIVE, pp. 421–434, 2008, Accessed: 00, 2020. [Online]. Available: