期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 22, 期 2, 页码 345-354出版社
WILEY
DOI: 10.1111/j.1420-9101.2008.01651.x
关键词
Bergmann's rule; body size; clinal variation; Gloger's rule; melanin-based coloration; natural and sexual selection; temperate zones; tropics
资金
- Swiss Academy of Sciences, the American Natural History Museum in New York
- Swiss National Science Foundation [PPOOA-102 913]
Spatial variation in the pattern of natural selection can promote local adaptation and genetic differentiation between populations. Because heritable melanin-based ornaments can signal resistance to environmentally mediated elevation in glucocorticoids, to oxidative stress and parasites, populations may vary in the mean degree of melanic coloration if selection on these phenotypic aspects varies geographically. Within a population of Swiss barn owls (Tyto alba), the size of eumelanic spots is positively associated with survival, immunity and resistance to stress, but it is yet unknown whether Tyto species that face stressful environments evolved towards a darker eumelanic plumage. Because selection regimes vary along environmental gradients, we examined whether melanin-based traits vary clinally and are expressed to a larger extent in the tropics where parasites are more abundant than in temperate zones. To this end, we considered 39 barn owl species distributed worldwide. Barn owl species living in the tropics displayed larger eumelanic spots than those found in temperate zones. This was, however, verified in the northern hemisphere only. Parasites being particularly abundant in the tropics, they may promote the evolution of darker eumelanic ornaments.
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