Chemical Ecology The Chemistry of Biotic Interaction (1995) / Chapter Skim
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The Chemistry of Sexual Selection
The Chemistry of Sexual Selection
Pages 119-132
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From page 119... ...
The Chemistry of Sex Attraction /117 41.
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From page 121... ...
Our studies were done mostly with populations of the moth from central Florida. Thomas Eisner is Schurman Professor of Biology and director of the Cornell Institute for Research in Chemical Ecology and lerrold Meinwald is Goldwin Smith Professor of Chemistry at Cornell University, Ithaca, New York.
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From page 122... ...
, were known to contain pyrrolizidine alkaloids (henceforth abbreviated as PAs) , intensely bitter compounds potently hepatotoxic to mammals (71.
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From page 125... ...
The Chemistry of Sexual Seleclrion /121 at, ._ ._ ~ up CAM ~ ,$= at: ~.
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From page 126... ...
clavipes and found that by doing so we could render such items relatively unacceptable to the spiders (6~. Adult Utetheisa tend to be rejected also by birds (blue jays, Cyanocitta cristata; scrub jays, Aphelocoma coerulescens; T.E., unpublished observations)
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From page 127... ...
When quiescent females were stroked with excised coremata, they tended to present their abdomen, but only if the coremata contained HD. Moreover, to elicit maximal effect, the HD had to be of the absolute configuration fR(-~]
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From page 130... ...
Moreover, field observation had told us that the seeds of Crotalaria were a variable resource, for which the larvae might need to compete at times. We also knew that adult Utetheisa differed substantially in their PA load in nature and that under experimental conditions their PA load varied in proportion to the seed content of the larval diet (9, 241.
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From page 131... ...
Larger males transfer larger spermatophores, and thus more nutrient for investment in eggs (with each mating beyond the first, the female is able to produce, on average, an extra 32 eggs, an equivalent of upward of 10% of her basic output)
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From page 132... ...
Male Utetheisa can be caused to produce inordinately small spermatophores if they are mated relatively recently beforehand. If such mated males are placed in competition with physically smaller males, whose spermatophores may now be the relatively larger ones, they tend to "lose out" (301.
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