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Snigirov S.,Odesa National Mechnikov University | Sizo R.,Center for Regional Studies | Sylantyev S.,University College London | Sylantyev S.,University of Edinburgh
Marine Biodiversity Records | Year: 2013

The present paper reports the first finding of two gastropod species, Aporrhais pespelecani and Turritella communis in the north-western part of the Black Sea more than 500 km north from the edge of their native range (the Bosphorus Strait). The possible role of different hydrological factors in a spread of the species range, their perspective influence on the local demersal community and probable vectors of dissemination are discussed. © Marine Biological Association of the United Kingdom 2013.

Snigirov S.,Odesa National Mechnikov University | Medinets V.,Odesa National Mechnikov University | Chichkin V.,Odesa National Mechnikov University | Sylantyev S.,University College London
Aquatic Invasions | Year: 2013

Between 2004 and 2012, populations of Mediterranean mussel (Mytilus galloprovincialis) and rapa whelk (Rapana venosa) from the coastal waters of Zmiinyi Island (Black Sea) were assessed for distribution, abundance, size, and age characteristics. Compared to 2004-2005, the mussel bed cover in 2012 decreased by 75.6%, the maximum depth of occurrence reduced from 22-25 m to 10-12 m, and total biomass declined by 44.6%. There was a concurrent decrease in abundance of demersal fishes dependent upon mussels as prey. We concluded that the invasive rapa whelk has had a detrimental impact on this demersal ecosystem. The possible influence of the introduced ctenophore Mnemiopsis leidyi on the two mollusc's populations has also been discussed. © 2013 The author(s).

Snigirov S.,Odesa National Mechnikov University | Goncharov O.,Ukrainian Academy of Sciences | Sylantyev S.,University College London
Marine Biodiversity | Year: 2012

The fish fauna assemblage and its association with environmental factors in the waters around Zmiinyi Island in the Black Sea were examined based on biological and hydrological data collected in the period 2003-2011. The aims of the study were to identify the fish species composition and community parameters in the area, to determine the contribution of different environmental factors to seasonal variations of the fish assemblage, and to assess the Danube outflow-induced shaping of the fish species community on a seasonal time scale. A total of 58 species belonging to 35 families were collected; most were of Mediterranean origin. The most abundant species were Atherina boyeri, Aidablennius sphynx, Engraulis encrasicolus, Merlangius merlangus, Neogobius melanostomus, Sprattus sprattus and Trachurus mediterraneus. The fish community in the area studied displayed pronounced seasonal variations. Mediterranean species were the group which predominantly determined the directions of such variations and the overall community structure. Data analysis revealed temperature and salinity to be the most important factors influencing the community assemblage. Despite the substantial amount of freshwater runoff from the adjacent Danube Delta, seasonal variations in this factor did not cause significant fluctuations in fish fauna composition. © 2012 Senckenberg, Gesellschaft für Naturforschung and Springer.

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