Distribution and habitats of the alien invader freshwater snail Physa acuta in South Africa

Abstract

This article focuses on the geographical distribution and habitats of the invader freshwater snail species Physa acuta as reflected by samples taken from 758 collection sites on record in the database of the National Freshwater Snail Collection (NFSC) at the Potchefstroom Campus of the North-West University. This species is currently the second most widespread alien invader freshwater snail species in South Africa. The 121 different loci ( 1/16-degree squares) from which the samples were collected, reflect a wide but discontinuous distribution mainly clustered around the major ports and urban centres of South Africa. Details of each habitat as described by collectors during surveys were statistically analysed, as well as altitude and mean annual air temperatures and rainfall for each locality. This species was reported from all types of water-bodies rep resented in the database, but the largest number of samples was recovered from dams and rivers.

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