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Land snails are organisms particularly suited for answering questions pertaining to the factors that determine island species\u2013area relationships, because of their dependence on edaphic conditions, low migration rates and high speciation rates. In this study, we analyse the land snail fauna in 73 standard quadrats of 20\u2009m \u00d7 20\u2009m on 13 islands of diverse geological origin off the coast of Sabah, northern Borneo, as well as one mainland site. We find a strong species\u2013area relationship with slope (<jats:italic>z<\/jats:italic>-value) of 0.17. We also find that species abundance distributions for each island are best explained by a niche-based model. Finally, contrary to expectations, island area has a strong positive effect on point diversity within a 20\u2009m \u00d7 20\u2009m-quadrat. We discuss these results in the light of the relationship of area to population dynamics, habitat availability and primary productivity.<\/jats:p><jats:sec><jats:title>Supplementary materials:<\/jats:title><jats:p>The full quadrat-based data for all 98 snail species and goodness-of-fit (AIC-values) for five species abundance distribution models are available at<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/www.geolsoc.org.uk\/SUP18550\">www.geolsoc.org.uk\/SUP18550<\/jats:ext-link>.<\/jats:p><\/jats:sec>","DOI":"10.1144\/jgs2012-014","type":"journal-article","created":{"date-parts":[[2013,4,25]],"date-time":"2013-04-25T15:44:26Z","timestamp":1366904666000},"page":"539-545","source":"Crossref","is-referenced-by-count":9,"title":["Species diversity patterns in insular land snail communities of Borneo"],"prefix":"10.1144","volume":"170","author":[{"given":"Menno","family":"Schilthuizen","sequence":"first","affiliation":[{"name":"Naturalis Biodiversity Center, PO Box 9517, 2300 RA Leiden, The Netherlands"},{"name":"Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, PO Box 2073, 88999 Kota Kinabalu, Malaysia"}]},{"given":"Thor-Seng","family":"Liew","sequence":"additional","affiliation":[{"name":"Naturalis Biodiversity Center, PO Box 9517, 2300 RA Leiden, The Netherlands"},{"name":"Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, PO Box 2073, 88999 Kota Kinabalu, Malaysia"}]},{"given":"Thor-Hui","family":"Liew","sequence":"additional","affiliation":[{"name":"Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, PO Box 2073, 88999 Kota Kinabalu, Malaysia"}]},{"given":"Patricia","family":"Berlin","sequence":"additional","affiliation":[{"name":"Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, PO Box 2073, 88999 Kota Kinabalu, Malaysia"}]},{"given":"Jaqueline P.","family":"King","sequence":"additional","affiliation":[{"name":"Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, PO Box 2073, 88999 Kota Kinabalu, Malaysia"}]},{"given":"Maklarin","family":"Lakim","sequence":"additional","affiliation":[{"name":"Sabah Parks, Research and Education Division, PO Box 10626, 88806 Kota Kinabalu, Malaysia"}]}],"member":"1881","published-online":{"date-parts":[[2013,4,4]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.2307\/2255763"},{"key":"e_1_3_2_3_1","doi-asserted-by":"crossref","unstructured":"Brown J.H. 1981. 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