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- W3127588752 abstract "ABSTRACT Aim To test the ‘more individuals hypothesis’ as a mechanism for the positive association between energy availability and species richness. This hypothesis predicts that total density and energy use in communities is linearly related to energy availability, and that species richness is a positive function of increased density. We also evaluate whether similar energy–density patterns apply to different migratory groups (residents, short‐distance migrants and tropical migrants) separately. Location European and North American forest bird communities. Methods We collected published breeding bird census data from Europe and North America ( n = 187). From each census data we calculated bird density (pairs 10 ha −1 ), energy use by the community (the sum of metabolic needs of individuals, Watts 10 ha −1 ) and geographical location with an accuracy of 0.5°. For each bird census data coordinate we extracted the corresponding monthly values of actual evapotranspiration (AET). From these values we calculated corresponding AET values that we expected to explain the density energy use of forest birds: total annual, breeding season (June) and winter AET. We used general linear modelling to analyse these data controlling for the area of census plots, forest type and census method. Results Total density and energy use in European and North American forest bird communities were linear functions of annual productivity, and increased density and energy use then translated into more species. Also resident bird density and energy consumption were positive functions of annual productivity, but the relationship between productivity and density as well as between productivity and energy use was weaker for migrants. Main conclusions Our results are consistent with the more individuals hypothesis that density and energy use in breeding forest bird communities is coupled tightly with the productivity of the environment, and that increased density and energy consumption results in more species. However, not all community members (migratory groups) are limited by productivity on the breeding grounds." @default.
- W3127588752 created "2021-02-15" @default.
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- W3127588752 date "2006-05-01" @default.
- W3127588752 modified "2023-10-14" @default.
- W3127588752 title "Energy availability, abundance, energy-use and species richness in forest bird communities: a test of the species-energy theory" @default.
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- W3127588752 doi "https://doi.org/10.1111/j.1466-8238.2006.00224.x" @default.
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