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Multiscale assessment of patterns of avian species richness

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dc.contributor.author Rahbek, C. en
dc.contributor.author Graves, Gary R. en
dc.date.accessioned 2010-02-24T19:48:07Z
dc.date.available 2010-02-24T19:48:07Z
dc.date.issued 2001
dc.identifier.citation Rahbek, C. and Graves, Gary R. 2001. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F8703">Multiscale assessment of patterns of avian species richness</a>." <em>Proceedings of the National Academy of Sciences of the United States of America</em>. 98 (8):4534&ndash;4539. en
dc.identifier.issn 0027-8424
dc.identifier.uri http://hdl.handle.net/10088/8703
dc.description.abstract The search for a common cause of species richness gradients has spawned more than 100 explanatory hypotheses in just the past two decades. Despite recent conceptual advances, further refinement of the most plausible models has been stifled by the difficulty of compiling high-resolution databases at continental scales. We used a database of the geographic ranges of 2,869 species of birds breeding in South America (nearly a third of the world&#39;s living avian species) to explore the influence of climate, quadrat area, ecosystem diversity, and topography on species richness gradients at 10 spatial scales (quadrat area, approximate to 12,300 to approximate to1,225,000 km(2)). Topography, precipitation, topography x latitude, ecosystem diversity, and cloud cover emerged as the most important predictors of regional variability of species richness in regression models incorporating 16 independent variables, although ranking of variables depended on spatial scale. Direct measures of ambient energy such as mean and maximum temperature were of ancillary importance. Species richness values for 1 degrees x 1 degrees latitude-longitude quadrats in the Andes (peaking at 845 species) were approximate to 30-250% greater than those recorded at equivalent latitudes in the central Amazon basin. These findings reflect the extraordinary abundance of species associated with humid montane regions at equatorial latitudes and the importance of orography in avian speciation. In a broader context, our data reinforce the hypothesis that terrestrial species richness from the equator to the poles is ultimately governed by a synergism between climate and coarse-scale topographic heterogeneity. en
dc.relation.ispartof Proceedings of the National Academy of Sciences of the United States of America en
dc.title Multiscale assessment of patterns of avian species richness en
dc.type Journal Article en
dc.identifier.srbnumber 75000
rft.jtitle Proceedings of the National Academy of Sciences of the United States of America
rft.volume 98
rft.issue 8
rft.spage 4534
rft.epage 4539
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Vertebrate Zoology en
dc.citation.spage 4534
dc.citation.epage 4539


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