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Premium CONDITION DEPENDENCE OF SEXUAL ORNAMENT SIZE AND VARIATION IN THE STALK‐EYED FLY CYRTODIOPSIS DALMANNI (DIPTERA: DIOPSIDAE)
Author(s)
Cotton Samuel,
Fowler Kevin,
Pomiankowski Andrew
Publication year2004
Publication title
evolution
Resource typeJournals
PublisherBlackwell Publishing Ltd
Abstract We used the stalk‐eyed fly Cyrtodiopsis dalmanni to examine predictions made by condition‐dependent handicap models of sexual selection. Condition was experimentally varied by manipulation of larval food availability. Cyrtodiopsis dalmanni is a highly dimorphic species exhibiting strong sexual selection, and the male sexual ornament (exaggerated eyespan) showed strong condition‐dependent expression relative to the homologous trait in females and nonsexual traits. Male eyespan also showed a great increase in standardized variance under stress, unlike nonsexual traits. The inflated variance of the male ornament was primarily attributable to condition‐dependent (but body‐size‐independent) increase in variance. Thus, evaluation of male eyespan allows females to gain additional information about male condition over and above that given by body size. These findings accord well with condition‐dependent handicap models of sexual selection.
Subject(s)artificial intelligence , astrophysics , biology , computer science , evolutionary biology , physics , programming language , selection (genetic algorithm) , sexual dimorphism , sexual selection , trait , variation (astronomy) , zoology
Language(s)English
SCImago Journal Rank1.84
H-Index199
eISSN1558-5646
pISSN0014-3820
DOI10.1111/j.0014-3820.2004.tb00437.x

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