Abstract:
:In studies of sexual selection, larger size is often argued to increase male fitness, and relatively smaller males are explained by genetic and/or environmental variation. We demonstrate that a size-development life-history trade-off could underlie the maintenance of a broad, unimodal distribution of size in male redback spiders (Latrodectus hasselti). Larger males are superior in direct competition, but redback males mature rapidly at small size in the presence of females. In field enclosures, we simulated two competitive contexts favouring development of divergent male sizes. Relatively smaller males lost when competing directly, but had 10 times higher fitness than relatively larger males when given the temporal advantage of rapid development. Linear selection gradients confirmed the reversal of selection on size, showing that it is critical to consider life-history decisions underlying the development of traits related to fitness.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Kasumovic MM,Andrade MCdoi
10.1111/j.1420-9101.2008.01648.xsubject
Has Abstractpub_date
2009-02-01 00:00:00pages
324-33issue
2eissn
1010-061Xissn
1420-9101pii
JEB1648journal_volume
22pub_type
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