Vanishing of an isolated population of thick-clawed crayfish Astacus pachypus (Crustacea: Decapoda: Astacidae) in the Sevastopol Bay (Crimean Peninsula, Black Sea)

Abstract

In the XIX and XX centuries thickclawed crayfish Astacus pachypus was reported for the Sevastopol area in Crimea. Nowadays significant changes of hydrolological conditions and substrates took place in the only possible locality where a population of this species could exist-inner part of the Sevastopol Bay and the mouth of River Chernaya. Biotopes characteristic for this place in the XIX century were lost. Since the conditions optimal for thick-clawed crayfish in the River Chernaya estuary are currently absent, this species most likely has vanished from the Sevastopol area. РЕЗЮМЕ. В XIX и начале XX веков в Крыму, в районе Севастополя отмечался толстопалый рак Astacus pachypus. К настоящему времени в месте наиболее вероятного обитания этого вида-кутовой части Севастопольской бухты и устья реки Черной произошли значительные изменения гидрологических условий, субстрата и утрата биотопов, характерных для этих мест в прошлом. Поскольку условия, оптимальные для жизни толстопалого рака в эстуарии реки Черной в настоящее время отсутствуют, то с большой долей вероятности можно предположить, что в районе Севастополя этот вид исчез.

On the taxonomic identity of the representatives of the brachyuran genus Pilumnus Leach, 1816 (Decapoda: Brachyura: Pilumnidae) occurring along the Russian coasts of the Black Sea

“…However, there are still new records of decapod crustaceans and their associated fauna published from the region [e.g. Ashelby et al, 2013;Marin, 2013;Gavrilova, Dovgal, 2016;Revkov, 2016;Marin, Sokolova, 2014;Marin, Turbanov, 2016;Marin, 2017;Shalovenkov, 2017;Guchmanidze et al, 2017; in press] whereas some cases of the local extinction of particular species have been also reported [Anosov, Timofeev, 2016]. At the same time, the current decapod species list form the Black Sea include the number of species identified by the analogy with the species from European seas in early years of faunistic research.…”