The land molluscs of North Ronaldsay, Orkney: human intervention and island faunal diversity

Submitted by admin on Sun, 20/11/2011 18:55
R.A.D. CAMERON
(2002)
Volume
37
Part
5
Page from
445

A survey in July 2001 found 23 species of land mollusc on the island of North Ronaldsay, Orkney. A total of 26 have been recorded since 1965. While this species richness is roughly as predicted from the island's area and latitude, the species composition of the fauna differs markedly fromthose of the Hebridean islands of Colonsay and Ulva. The fauna contains many anthropochorous species and lacks several species typical of wetland and woodlands which are present on the Hebridean islands. These results are discussed in relation to the islands' histories and their agricultural status.

Keywords
Land mollusc diversity
island faunas
human impact.