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The effects of a chromosomal inversion on adult size and male mating success in the seaweed fly coelopa frigida



The effects of a chromosomal inversion on adult size and male mating success in the seaweed fly coelopa frigida



Heredity 49(1): 51-62



An association is reported between the .alpha./.beta. inversion polymorphism on chromosome I and adult size as assessed by the length of wings, .alpha.alpha. flies are larger than .beta.beta. flies, with heterokaryotypes intermediate, and the differences are more marked in males than in females. Laboratory mating experiments were performed in which a single female was given a choice of 2 males. By examining the genotypes of the progeny larvae, the larger male is successful in a significantly greater proportion of trials than the smaller one. This mating success is dependent on the size difference between the males and on the female size. An indirect influence of the inversion on male mating success is suggested. The possible relevance of this effect to the maintenance of the inversion polymorphism in natural populations is discussed.

Accession: 006660064

Download citation: RISBibTeXText

DOI: 10.1038/hdy.1982.64



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