Melanin-specific life-history strategies.

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Version: Final published version
Serval ID
serval:BIB_EBBF75A8B178
Type
Article: article from journal or magazin.
Collection
Publications
Title
Melanin-specific life-history strategies.
Journal
American Naturalist
Author(s)
Emaresi G., Bize P., Altwegg R., Henry I., van den Brink V., Gasparini J., Roulin A.
ISSN
1537-5323 (Electronic)
ISSN-L
0003-0147
Publication state
Published
Issued date
2014
Peer-reviewed
Oui
Volume
183
Number
2
Pages
269-280
Language
english
Abstract
Abstract The maintenance of genetic variation is a long-standing issue because the adaptive value of life-history strategies associated with each genetic variant is usually unknown. However, evidence for the coexistence of alternative evolutionary fixed strategies at the population level remains scarce. Because in the tawny owl (Strix aluco) heritable melanin-based coloration shows different physiological and behavioral norms of reaction, we investigated whether coloration is associated with investment in maintenance and reproduction. Light melanic owls had lower adult survival compared to dark melanic conspecifics, and color variation was related to the trade-off between offspring number and quality. When we experimentally enlarged brood size, light melanic males produced more fledglings but in poorer condition, and they were less often recruited in the local breeding population than those of darker melanic conspecifics. Our results also suggest that dark melanic males allocate a constant effort to raise their brood independently of environmental conditions, whereas lighter melanic males finely adjust reproductive effort in relation to changes in environmental conditions. Color traits can therefore be associated with life-history strategies, and stochastic environmental perturbation can temporarily favor one phenotype over others. The existence of fixed strategies implies that some phenotypes can sometimes display a "maladapted" strategy. Long-term population monitoring is therefore vital for a full understanding of how different genotypes deal with trade-offs.
Keywords
life-history strategies, melanin, color polymorphism, genetic variation, melanin-based coloration
Pubmed
Web of science
Open Access
Yes
Create date
28/08/2013 14:42
Last modification date
20/08/2019 16:13
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