Energy, water and large-scale patterns of reptile and amphibian species richness in Europe

被引:144
|
作者
Rodríguez, MA
Belmontes, JA
Hawkins, BA
机构
[1] Univ Alcala de Henares, Dept Ecol, Madrid 28871, Spain
[2] Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA
来源
关键词
reptiles; amphibians; diversity gradients; species richness; energy hypothesis; productivity hypothesis; actual evapotranspiration; potential evapotranspiration; spatial autocorrelation;
D O I
10.1016/j.actao.2005.02.006
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We used regression analyses to examine the relationships between reptile and amphibian species richness in Europe and I I environmental variables related to five hypotheses for geographical patterns of species richness: (1) productivity; (2) ambient energy; (3) water-energy balance, (4) habitat heterogeneity; and (5) climatic variability. For reptiles, annual potential evapotranspiration (PET), a measure of the amount of atmospheric energy, explained 71 % of the variance, with variability in log elevation explaining an additional 6%. For amphibians, annual actual evapotranspiration (AET), a measure of the joint availability of energy and water in the environment, and the global vegetation index, an estimate of plant biomass generated through satellite remote sensing, both described similar proportions of the variance (61 % and 60%, respectively) and had partially independent effects on richness as indicated by multiple regression. The two-factor environmental models successfully removed most of the statistically detectable spatial autocorrelation in the richness data of both groups. Our results are consistent with reptile and amphibian environmental requirements, where the former depend strongly on solar energy and the latter require both warmth and moisture for reproduction. We conclude that ambient energy explains the reptile richness pattern, whereas for amphibians a combination of water-energy balance and productivity best explain the pattern. (c) 2005 Elsevier SAS. All rights reserved.
引用
收藏
页码:65 / 70
页数:6
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