Regional variation in the hierarchical partitioning of diversity in coral-dwelling fishes

Belmaker, Jonathan, Ziv, Yaron, Shashar, Nadav, and Connolly, Sean R. (2008) Regional variation in the hierarchical partitioning of diversity in coral-dwelling fishes. Ecology, 89 (10). pp. 2829-2840.

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Abstract

The size of the regional species pool may influence local patterns of diversity. However, it is unclear whether certain spatial scales are less sensitive to regional influences than others. Additive partitioning was used to separate coral-dwelling fish diversity to its alpha and beta components, at multiple scales, in several regions across the Indo-Pacific. We then examined how the relative contribution of these components changes with increased regional diversity. By employing specific random-placement null models, we overcome methodological problems with local–regional regressions. We show that, although alpha and beta diversities within each region are consistently different from random-placement null models, the increase in beta diversities among regions was similar to that predicted once heterogeneity in coral habitat was accounted for. In contrast, alpha diversity within single coral heads was limited and increased less than predicted by the null models. This was correlated with increased intraspecific aggregation in more diverse regions and is consistent with ecological limitations on the number of coexisting species at the local scale. These results suggest that, apart from very small spatial scales, variation in the partitioning of fish diversity along regional species richness gradients is driven overwhelmingly by the corresponding gradients in coral assemblage structure.

Item ID: 6241
Item Type: Article (Refereed Research - C1)
Keywords: marine sciences; OiRS; additive partitioning; coral reefs; fish; gamma diversity; scale; similarity; species diversity
Additional Information:

Reproduced with permission from Ecological Society of America (ESA).

ISSN: 1939-9170
Date Deposited: 18 Jan 2010 02:30
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
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