期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 20, 期 5, 页码 1859-1869出版社
WILEY
DOI: 10.1111/j.1420-9101.2007.01380.x
关键词
brown trout; disassortative mating; mate choice; MHC class II beta; microsatellite; optimal outbreeding; reproductive output; reproductive success; Salmo trutta
We examined the reproductive success of 48 adult brown trout (Salmo trutta L.) which were allowed to reproduce in a stream that was controlled for the absence of other trout. Parentage analyses based on 11 microsatellites permitted us to infer reproductive success and mate choice preferences in situ. We found that pairs with intermediate major histocompatibility complex (MHC) dissimilarity mated more often than expected by chance. It appears that female choice was the driving force behind this observation because, compared with other individuals, males with intermediate MHC dissimilarity produced a larger proportion of offspring, whereas female reproductive output did not show this pattern. Hence, rather than seeking mates with maximal MHC dissimilarity, as found in several species, brown trout seemed to prefer mates of intermediate MHC difference, thus supporting an optimality-based model for MHC-dependent mate choice.
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