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Absence of direct sexual selection for parasitoid encapsulation in Drosophila melanogaster
Author(s) -
Kraaijeveld A. R.,
Emmett D. A.,
Godfray H. C. J.
Publication year - 1997
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.1997.10030337.x
Subject(s) - biology , parasitoid , parasitism , drosophila melanogaster , zoology , sexual selection , mate choice , larva , hymenoptera , mating , ecology , gene , host (biology) , genetics
Abstract Resistance against parasites may play a role in female mate choice, especially if males that have actually survived parasitism can be discriminated from males that have not been parasitised. Larvae of several Drosophila species are subject to attack by hymenopteran parasitoids, but have the ability to kill the parasitoid egg through the process of encapsulation. Because an encapsulated egg remains visible in the abdomen of the adult fly throughout its life, its presence in a male signals to a female that the male has the genes to survive parasitism. The hypothesis that females preferentially mate with males bearing an encapsulated egg in their abdomen was tested using D. melanogaster . No indication was found for this female preference. The absence of preference for males with “good genes” could result from sensory constraints in the female or a negative correlation between encapsulation ability and some other fitness component. Alternatively, it is hypothesised that the black abdominal ends of the males of many species in the melanogaster ‐group evolved to mimic encapsulated eggs, leading to the breakdown of capsule recognition by the female.