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A Mechanism of Extreme Growth and Reliable Signaling in Sexually Selected Ornaments and Weapons

Emlen, Douglas J. ; Warren, Ian A. ; Johns, Annika ; Dworkin, Ian ; Lavine, Laura Corley

Science (American Association for the Advancement of Science), 2012-08, Vol.337 (6096), p.860-864 [Periódico revisado por pares]

Washington, DC: American Association for the Advancement of Science

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Título:
A Mechanism of Extreme Growth and Reliable Signaling in Sexually Selected Ornaments and Weapons
Autor: Emlen, Douglas J. ; Warren, Ian A. ; Johns, Annika ; Dworkin, Ian ; Lavine, Laura Corley
Assuntos: Animal wings ; Animals ; Beetles ; Biological and medical sciences ; Biological evolution ; Body size ; Cell growth ; Coleoptera - anatomy & histology ; Coleoptera - genetics ; Coleoptera - growth & development ; Deer ; Evolution ; Fitness ; Fundamental and applied biological sciences. Psychology ; Gene Knockdown Techniques ; Genetics of eukaryotes. Biological and molecular evolution ; Genitalia ; Growth traits ; Horns ; Horns - anatomy & histology ; Horns - growth & development ; Insulin - physiology ; Insulin-like growth factors ; Male ; Male animals ; Mating Preference, Animal ; Molecular Sequence Data ; Online ; Pathways ; Phenotypic traits ; Receptor, Insulin - genetics ; Receptor, Insulin - physiology ; Sexual selection ; Signal Transduction ; Somatomedins - physiology ; Weapons
É parte de: Science (American Association for the Advancement of Science), 2012-08, Vol.337 (6096), p.860-864
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Many male animals wield ornaments or weapons of exaggerated proportions. We propose that increased cellular sensitivity to signaling through the insulin/insulin-like growth factor (IGF) pathway may be responsible for the extreme growth of these structures. We document how rhinoceros beetle horns, a sexually selected weapon, are more sensitive to nutrition and more responsive to perturbation of the insulin/IGF pathway than other body structures. We then illustrate how enhanced sensitivity to insulin/IGF signaling in a growing ornament or weapon would cause heightened condition sensitivity and increased variability in expression among individuals—critical properties of reliable signals of male quality. The possibility that reliable signaling arises as a by-product of the growth mechanism may explain why trait exaggeration has evolved so many different times in the context of sexual selection.
Editor: Washington, DC: American Association for the Advancement of Science
Idioma: Inglês

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A Mechanism of Extreme Growth and Reliable Signaling in Sexually Selected Ornaments and Weapons

Emlen, Douglas J. ; Warren, Ian A. ; Johns, Annika ; Dworkin, Ian ; Lavine, Laura Corley

Washington, DC: American Association for the Advancement of Science

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