First Record of Branchiura sowerbyi Beddard, 1892 (Oligochaeta) in the Sheksna Reservoir (Upper Volga)

摘要

In August 2021, two specimens of alien oligochaetes of tropical origin Branchiura sowerbyi were found in the Sheksna Reservoir of the Vologda oblast (59 & DEG;45 & PRIME;21 & DPRIME; N, 38 & DEG;21 & PRIME;28 & DPRIME; E). As of today, this is the northernmost finding of this species. Probably, this species penetrated with the ballast waters from the Don River lower course through the Volga-Don canal and the Volga-Baltic waterway. The temperature regime of the water bodies of the Vologda region allows reproduction of this oligochaete.