首页>
外文期刊>Oceanology
>Long-Term Changes in the Structure of Coastal Benthic Communities in the Northeastern Part of the Black Sea:Influence of Alien Species
【24h】
Long-Term Changes in the Structure of Coastal Benthic Communities in the Northeastern Part of the Black Sea:Influence of Alien Species
Changes in the structure of benthic communities in the northeastern part of the Black Sea were determined by comparing results of surveys made in 1957,1963,1968 [14,16-18];in 1980 [28];in 1989 [1];and in 1999-2000 [20] with surveys made in 2001-2004.The species composition and structure of communities differed significantly between surveys,but only the southern part of the shelf (Gelendzhik-Adler) has undergone especially strong changes,while the North Caucasian coast has remained intact.Since introduction of Mnemiopsis leidyi (Agassiz,1865) in 1988 a catastrophic decline of quantity and biomass of dominating bivalves has been observed.It was caused not only by Mnemiopsis predation,but also by the predation of Rapana venosa (Valenciennes,1846).The biodiversity of benthic communities was reduced by half.Since the earlier studies,exotic bivalve Anadara inaequivalvis (Bruguiere,1789) have become abundant.Plausible reasons for such drastic alterations are discussed.
展开▼
