The Worldwide Variation in Avian Clutch Size across Species and Space. Jetz, W., Sekercioglu, C. H., & Bohning-Gaese, K. PLoS Biology, 6(12):e303, 2008.
Paper abstract bibtex Traits such as clutch size vary markedly across species and environmental gradients but have usually been investigated from either a comparative or a geographic perspective, respectively. We analyzed the global variation in clutch size across 5,290 bird species, excluding brood parasites and pelagic species. We integrated intrinsic (morphological, behavioural), extrinsic (environmental), and phylogenetic effects in a combined model that predicts up to 68% of the interspecific variation in clutch size. We then applied the same species-level model to predict mean clutch size across 2,521 assemblages worldwide and found that it explains the observed eco-geographic pattern very well. Clutches are consistently largest in cavity nesters and in species occupying seasonal environments, highlighting the importance of offspring and adult mortality that is jointly expressed in intrinsic and extrinsic correlates. The findings offer a conceptual bridge between macroecology and comparative biology and provide a global and integrative understanding of the eco-geographic and cross-species variation in a core life-history trait.
@ARTICLE{Jetz2008,
author = {Jetz, Walter and Sekercioglu, Cagan H. and Bohning-Gaese, Katrin},
title = {The Worldwide Variation in Avian Clutch Size across Species and Space},
journal = {PLoS Biology},
year = {2008},
volume = {6},
pages = {e303},
number = {12},
abstract = {Traits such as clutch size vary markedly across species and environmental
gradients but have usually been investigated from either a comparative
or a geographic perspective, respectively. We analyzed the global
variation in clutch size across 5,290 bird species, excluding brood
parasites and pelagic species. We integrated intrinsic (morphological,
behavioural), extrinsic (environmental), and phylogenetic effects
in a combined model that predicts up to 68% of the interspecific
variation in clutch size. We then applied the same species-level
model to predict mean clutch size across 2,521 assemblages worldwide
and found that it explains the observed eco-geographic pattern very
well. Clutches are consistently largest in cavity nesters and in
species occupying seasonal environments, highlighting the importance
of offspring and adult mortality that is jointly expressed in intrinsic
and extrinsic correlates. The findings offer a conceptual bridge
between macroecology and comparative biology and provide a global
and integrative understanding of the eco-geographic and cross-species
variation in a core life-history trait.},
date = {December 01, 2008},
file = {:Walteretal2008.pdf:PDF},
owner = {Tiago},
subdatabase = {other},
timestamp = {2009.01.16},
url = {http://dx.doi.org/10.1371%2Fjournal.pbio.0060303}
}
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