Female resistance and male preference in a stream-dwelling isopod: effects of female molt characteristics |
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Authors: | T C Sparkes D P Keogh K E Haskins |
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Institution: | (1) Center for Ecology, Evolution and Behavior T. H. Morgan School of Biological Sciences University of Kentucky, Lexington, KY 40506-0225, USA e-mail: tcspar2@pop.uky.edu Tel.: +1-606-3235491, Fax: +1-606-2571717, US;(2) Graduate Center for Toxicology, University of Kentucky, Lexington, KY 40506-0054, USA, US |
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Abstract: | In the stream-dwelling isopod, Lirceus fontinalis, mating contests between males and females occur prior to pair formation. We examined the relative contribution of male preference
and female resistance to contest outcomes. We first quantified male and female behavior during typical mating interactions
and examined the relationship between time until molt (TTM) and mating outcomes. We then examined the role of male preference
and female resistance in determining mating outcomes when females differed in molt type (growth, egg deposition) and appeared
to differ in TTM (due to hormone applications). Both male preference and female resistance contributed to different components
of the mating sequence but female resistance ultimately determined whether or not pair formation occurred. Males expressed
a preference for females that appeared to be close to molt, using variation in levels of molt hormone as a cue. However, males
did not discriminate between females based on molt type.
Received: 5 March 1999 / Received in revised form: 10 August 1999 / Accepted: 16 October 1999 |
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Keywords: | Isopod Sexual conflict Male preference Female resistance Molting hormone |
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