Show simple item record Johnson, Darren W. Monro, Keyne Marshall, Dustin J. 2012-11-16T16:20:17Z 2012-11-16T16:20:17Z 2012-12-04
dc.identifier doi:10.5061/dryad.c43f1
dc.identifier.citation Johnson DW, Monro K, Marshall DJ (2013) The maintenance of sperm variability: context-dependent selection on sperm morphology in a broadcast spawning invertebrate. Evolution 67(5): 1383-1395.
dc.description Why are sperm so variable despite having a singular, critical function and an intimate relationship with fitness? A key to understanding the evolution of sperm morphology is identifying which traits enable sperm to be successful fertilizers. Several sperm traits (e.g. tail length, overall size) are implicated in sperm performance, but the benefits of these traits are likely to be highly context-dependent. Here, we examined phenotypic selection on sperm morphology of a broadcast spawning tube worm (Galeolaria gemineoa). We conducted laboratory experiments to measure the relationship between average sperm morphology and relative fertilization success across a range of sperm environments that were designed to approximate the range of sperm concentrations and ages encountered by eggs in nature. We found that the strength and form of multivariate selection varied substantially across our environmental gradients. Sperm with long tails and small heads were favored in high-concentration environments, whereas sperm with long heads were favored at low concentrations and old ages. We suggest variation in the local fertilization environment and resulting differences in selection can preserve variability in sperm morphology both within and among males.
dc.relation.haspart doi:10.5061/dryad.c43f1/1
dc.relation.haspart doi:10.5061/dryad.c43f1/2
dc.relation.isreferencedby doi:10.1111/evo.12022
dc.relation.isreferencedby PMID:23617915
dc.subject anisogamy
dc.subject canonical analysis
dc.subject disruptive selection
dc.subject fertilization success
dc.subject sperm competition
dc.subject sperm limitation
dc.title Data from: The maintenance of sperm variability: context-dependent selection on sperm morphology in a broadcast spawning invertebrate
dc.type Article *
dwc.ScientificName Galeolaria gemineoa
dc.contributor.correspondingAuthor Johnson, Darren W.
prism.publicationName Evolution

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Title Galeo.sperm.characteristics
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Description Measurements of sperm morphological traits, including replicate measures for multiple males
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Title Galeolaria.fertilization.success
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Description Estimates of fertilization success across a range of sperm concentrations
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