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Hamilton and Zuk proposed that bright plumage in birds indicates genetic resistance to parasites, and that by selecting brighter
males as mates, females can increase their offspring’s fitness due to this inherited resistance. The theory predicts a negative
relationship between parasite load and plumage brightness in males. We used Sindbis virus clearance rate after an experimental
infection to quantify parasite resistance in male greenfinches (Carduelis chloris) and related variation in clearance rate with variation in male plumage brightness. We found that certain aspects of brightness
of the male plumage (i.e. tail-patch area) could be used to predict the virus infection clearance rate. Wing brightness was
uninformative of virus clearance rate, but revealed age class. We found no clear relationship between antibody production
rate and virus clearance rate or total viraemia. However, males with large tail patches tended to have a higher antibody production
rate. The results suggest that the size of the male tail patch may function as an indicator of an individual male’s ability
to resist parasite infections, thus supporting the Hamilton-Zuk theory for a novel taxon of parasites, a virus.
Received: 11 November 1999 / Received in revised form: 13 March 2000 / Accepted: 1 April 2000 相似文献
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