Heritability of size but not symmetry in a sexually selected trait chosen by female earwigs

Article Abstract:

Evidence that female preferences for exaggerated secondary sexual traits can influence trait expression in offspring has come from a sib analysis of the length of the sexually selected forceps of male European earwigs, Forficula auricularia. Significant levels of additive genetic variance were found. Using both sib analysis and an estimate from the phenotypic and genotypic correlations of both sides, no evidence for additive genetic variance in forceps fluctuating asymmetry (FA) was found. There is some reason to believe that females searching for 'good genes' should be impressed by ornament symmetry.

United Kingdom, Sexual behavior in animals, Animal sexual behavior, Sexual selection in animals, Sexual selection (Natural selection), Earwigs

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Strong genetic structuring in a habitat specialist, the Oxleyan Pygmy Perch Nannoperca oxyleyana

Article Abstract:

The strong genetic structuring that has been found using allozyme and mtDNA control region variation in a habitat specialist, the freshwater Oxleyan pygmy perch, Nannoperca oxyleyana, which is to be found in only a restricted area in Australia, is discussed. Four streams may have had a confluence relatively recently, perhaps when sea level was lower, because four sites along 200 km of coast were surprisingly similar.

Statistical Data Included, Adaptation (Biology), Evolutionary adaptation, Population genetics, Perch, Fishes, Fresh-water, Freshwater fishes

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