Environmental drivers of beta-diversity patterns in New-World birds and mammals

被引:179
作者
Melo, Adriano S. [1 ]
Rangel, Thiago Fernando L. V. B. [2 ]
Diniz-Filho, Jose Alexandre F. [3 ]
机构
[1] Univ Fed Rio Grande do Sul, Dept Ecol, IB, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Connecticut, Dept Ecol & Evolutionary Biol, Storrs, CT 06269 USA
[3] Univ Fed Goias, Dept Biol Geral, ICB, BR-74001970 Goiania, Brazil
关键词
SPECIES RICHNESS; SPATIAL AUTOCORRELATION; LATITUDINAL GRADIENT; RAPOPORTS RULE; RED HERRINGS; SCALE; CLIMATE; HYPOTHESES; SIMILARITY; TURNOVER;
D O I
10.1111/j.1600-0587.2008.05502.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Current macroecological research places great emphasis on patterns of species richness (alpha diversity) and the underlying ecological and evolutionary processes involved in their origin and maintenance. However, few studies dealing with continental scales have addressed dissimilarities in species composition among areas (beta diversity). Using data for the occurrence of 3836 bird and 1641 mammal species in 4220 cells covering the New World, we assessed whether broad-scale macroecological patterns in beta diversity are related to dissimilarities in environmental variables and biotic units. We employed spatial regression and tree regression to model beta diversity. Difference in altitude was the best predictor of beta diversity. Accordingly, the highest beta diversity values were found in mountainous areas, particularly in the Andes, Central America and western North America. Explanatory variables related to transitions between biotic units (biome, ecoregion) were relatively unimportant. Areas that differ in altitude from their surroundings harbor different sets of species, and this may reflect either species adaptation to particular environmental conditions by range shifts, or species divergence by vicariance, or both.
引用
收藏
页码:226 / 236
页数:11
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