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      Faunal breaks and species composition of Indo-Pacific corals: the role of plate tectonics, environment and habitat distribution.

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          Abstract

          Species richness gradients are ubiquitous in nature, but the mechanisms that generate and maintain these patterns at macroecological scales remain unresolved. We use a new approach that focuses on overlapping geographical ranges of species to reveal that Indo-Pacific corals are assembled within 11 distinct faunal provinces. Province limits are characterized by co-occurrence of multiple species range boundaries. Unexpectedly, these faunal breaks are poorly predicted by contemporary environmental conditions and the present-day distribution of habitat. Instead, faunal breaks show striking concordance with geological features (tectonic plates and mantle plume tracks). The depth range over which a species occurs, its larval development rate and genus age are important determinants of the likelihood that species will straddle faunal breaks. Our findings indicate that historical processes, habitat heterogeneity and species colonization ability account for more of the present-day biogeographical patterns of corals than explanations based on the contemporary distribution of reefs or environmental conditions.

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          Author and article information

          Journal
          Proc. Biol. Sci.
          Proceedings. Biological sciences
          1471-2954
          0962-8452
          Jul 22 2013
          : 280
          : 1763
          Affiliations
          [1 ] Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland 4811, Australia. sally.keith@jcu.edu.au
          Article
          rspb.2013.0818
          10.1098/rspb.2013.0818
          3774232
          23698011

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