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island biogeography of Day Geckos (Phelsuma) in the Indian Ocean

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Summary

Step-wise multiple regression was employed to probe the determinants of species diversity of day geckos (Phelsuma) in the Indian Ocean. Independent variables were area, elevation, and two measures of isolation. Distance from Madagascar and island height (an indicator of habitat diversity) were the two most important predictors of species richness. Similar studies on other taxa rarely find isolation to be a major factor. The relatively poor dispersal abilities of reptiles may explain why isolation, rather than attributes of the islands, are more important in this case. The regressions also indicate that habitat diversity (assumed to correlate with maximum island elevation) is more important than area per se in determining species diversity. These results agree with predictions of the equilibrium theory of island biogeography, but historical processes have also greatly influenced species richness.

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Authors and Affiliations

  1. Museum of Vertebrate Zoology, University of California, 2593 Life Sciences Building, 94720, Berkeley, CA, USA

    Jonathan B. Losos

  2. Department of Zoology, University of California, 2593 Life Sciences Building, 94720, Berkeley, CA, USA

    Jonathan B. Losos

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Losos, J.B. island biogeography of Day Geckos (Phelsuma) in the Indian Ocean. Oecologia 68, 338–343 (1986). https://doi.org/10.1007/BF01036735

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