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Environmental correlates of herpetofaunal diversity in Costa Rica

Published online by Cambridge University Press:  30 July 2010

David Laurencio  and
Lee A. Fitzgerald
David Laurencio*
Affiliation:
Section of Ecology and Evolutionary Biology, Department of Wildlife and Fisheries Sciences, MS 2258, Texas A&M University, College Station, Texas 77843-2258, USA
Lee A. Fitzgerald
Affiliation:
Section of Ecology and Evolutionary Biology, Department of Wildlife and Fisheries Sciences, MS 2258, Texas A&M University, College Station, Texas 77843-2258, USA
*
1Corresponding author. Current address: Department of Biological Sciences, 331 Funchess Hall, Auburn University, Auburn, AL 36849, USA. Email: [email protected]
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Abstract:

Disentangling local and historical factors that determine species diversity patterns at multiple spatial scales is fundamental to elucidating processes that govern ecological communities. Here we investigated how environmental correlates may influence diversity at local and regional scales. Primarily utilizing published species lists, amphibian and reptile alpha and beta diversity were assessed at 17 well-surveyed sites distributed among ecoregions throughout Costa Rica. The degree to which regional species diversity patterns were related to environmental variables and geographic distance was determined using Canonical Correspondence Analysis and Mantel tests. Amphibian alpha diversity was highest in lowland Pacific sites (mean = 43.3 species) and lowest at the high elevation site (9 species). Reptile alpha diversity values were high for both lowland Atlantic (mean = 69.5 species) and lowland Pacific (mean = 67 species) sites and lowest for the high elevation site (8 species). We found high species turnover between local sites and ecoregions, demonstrating the importance of beta diversity in the determination of regional diversity. For both amphibians and reptiles, beta diversity was highest between the high-elevation site and all others, and lowest among lowland sites within the same ecoregion. The effect of geographic distance on beta diversity was minor. Ecologically significant climatic variables related to rain, temperature, sunshine and insolation were found to be important determinants of local and regional diversity for both amphibians and reptiles in Costa Rica.

Keywords

alphaabiotic factorsamphibiansbetaCosta Ricalocal species richnessreptiles
Type
Research Article
Information
Journal of Tropical Ecology , Volume 26 , Issue 5 , September 2010 , pp. 521 - 531
Copyright
Copyright © Cambridge University Press 2010

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