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Androgens, interspecific competition and species replacement in hybridizing warblers

The steroid hormone testosterone regulates aggressive behaviour in many vertebrates and is important for territorial defence among males of the same species. However, its role in mediating interspecific competition, and ultimately species distributions, is unknown. We show that testosterone may infl...

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Published in:	Proceedings of the Royal Society. B, Biological sciences Biological sciences, 2004-12, Vol.271 (Suppl 6), p.S498-S500
Main Authors:	Owen-Ashley, Noah T., Butler, Luke K.
Format:	Article
Language:	English
Subjects:	Aggression Analysis of Variance Androgens Androgens - blood Animal aggression Animals Demography Dendroica occidentalis Dendroica townsendi Extinction Geography Hermit lifestyle Human aggression Hybrid Zone Hybridity Hybridization Hybridization, Genetic Interspecific Competition Male Male animals Mating behavior Population Dynamics Radioimmunoassay Selection, Genetic Songbirds - genetics Songbirds - metabolism Songbirds - physiology Species Specificity Territoriality Testosterone Warbler Warblers Washington
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cited_by	cdi_FETCH-LOGICAL-c742t-653220fa7f50b5ed74e7f8a78825c2b898296be3dd6e7dce1ec9fbb895adb2ef3
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container_end_page	S500
container_issue	Suppl 6
container_start_page	S498
container_title	Proceedings of the Royal Society. B, Biological sciences
container_volume	271
creator	Owen-Ashley, Noah T. Butler, Luke K.
description	The steroid hormone testosterone regulates aggressive behaviour in many vertebrates and is important for territorial defence among males of the same species. However, its role in mediating interspecific competition, and ultimately species distributions, is unknown. We show that testosterone may influence the geographical replacement of one species by another. Townsend's warblers (Dendroica townsendi) have replaced hermit warblers (D. occidentalis) over a vast portion of their historical range, partly because Townsend's males are more aggressive than hermit males and outcompete them for territories in areas of sympatry. We report differences in plasma androgen levels that parallel these aggressive asymmetries and the historical pattern of species replacement between Townsend's and hermits. Using hybrids, we provide evidence that these hormonal differences are partially genetically based and thus may have evolved through sexual selection during Pleistocene glacial maxima. Hormone-behaviour mechanisms can therefore have important effects on species distributions and can even influence the pathways underlying extinction.
doi_str_mv	10.1098/rsbl.2004.0230
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B, Biological sciences</title><addtitle>Proc Biol Sci</addtitle><description>The steroid hormone testosterone regulates aggressive behaviour in many vertebrates and is important for territorial defence among males of the same species. However, its role in mediating interspecific competition, and ultimately species distributions, is unknown. We show that testosterone may influence the geographical replacement of one species by another. Townsend's warblers (Dendroica townsendi) have replaced hermit warblers (D. occidentalis) over a vast portion of their historical range, partly because Townsend's males are more aggressive than hermit males and outcompete them for territories in areas of sympatry. We report differences in plasma androgen levels that parallel these aggressive asymmetries and the historical pattern of species replacement between Townsend's and hermits. 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subjects	Aggression Analysis of Variance Androgens Androgens - blood Animal aggression Animals Demography Dendroica occidentalis Dendroica townsendi Extinction Geography Hermit lifestyle Human aggression Hybrid Zone Hybridity Hybridization Hybridization, Genetic Interspecific Competition Male Male animals Mating behavior Population Dynamics Radioimmunoassay Selection, Genetic Songbirds - genetics Songbirds - metabolism Songbirds - physiology Species Specificity Territoriality Testosterone Warbler Warblers Washington
title	Androgens, interspecific competition and species replacement in hybridizing warblers
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