Recent distribution of the freshwater crustacean Asellus Aquaticus (Linnaeus, 1758) (Isopoda; Crustacea) in Serbia (2007-2013 Period)

Abstract

Asellus aquaticus (Linnaeus, 1758) is the widespread and common Palearctic freshwater isopod found typically in the slow-current watercourses with rich organic debris. In Serbia there is a lack of data regarding both distribution and general ecology of this common freshwater species. This paper based on intensive field research covering almost entire territory of Serbia in 2007-2013 period aims to shed more light on the presence of this freshwater crustacean in our country. According to our findings, A. aquaticus is widely distributed throughout the investigated area. It was registered in vast variety of habitats, from large Pannonian lowland rivers, to small highland streams. It was found to be an important member of benthic communities and the dominant crustacean species in some habitats, such as small Pannonian streams. Regarding its high tolerance to organic pollution, and high overall adaptability, such wide distribution is expected. Presence of other A. aquaticus subspecies, besides type subspecies, as well as presence of Proasellus is not detected. Obtained data should result in more effective involvement of this species in a regional/national system of freshwater ecological status assessment.