Biogeographical determinants for total and endemic species richness in a continental archipelago |
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| Authors: | A S Kallimanis E Bergmeier M Panitsa K Georghiou P Delipetrou P Dimopoulos |
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| Institution: | 1.Department of Environmental and Natural Resource Management,University of Ioannina,Agrinio,Greece;2.Albrecht von Haller Institute of Plant Sciences,Georg-August University of G?ttingen,G?ttingen,Germany;3.Department of Botany, Faculty of Biology,National and Kapodistrian University of Athens,Athens,Greece |
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| Abstract: | We examined the relationship between plant species richness and biogeographical variables (island area, island maximum elevation,
distance from nearest inhabited island, distance from nearest mainland) using a data set comprising 201 islands of the Aegean
archipelago. We found that endemic species richness was strongly correlated to total species richness. Single-island endemic
species richness was most strongly correlated to island maximum elevation, and then to island area, with an apparent small
island effect for islands smaller than 47 km2. Total species richness was most strongly correlated to island area (with no apparent small island effect), and less strongly
correlated to island maximum elevation. Distance from the mainland or other inhabited islands displayed limited predictive
value in our data set. The slope of the relationship between species richness and geographical factors (island area, elevation,
distance from island/mainland) was steeper for endemic species richness than for total richness. Finally, the different scales
of endemicity (single-island endemics, island group endemics and Aegean regional endemics) displayed similar qualitative trends
and only differed quantitatively. Thus, we conclude that different biogeographical factors act as drivers for total species
richness than for endemic species richness. |
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