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An analytical framework for estimating fertilization bias and the fertilization set from multiple sperm-storage organs


Manier, Mollie K; Lüpold, Stefan; Pitnick, Scott; Starmer, William T (2013). An analytical framework for estimating fertilization bias and the fertilization set from multiple sperm-storage organs. The American Naturalist, 182(4):552-561.

Abstract

How sperm from competing males are used to fertilize eggs is poorly understood yet has important implications for postcopulatory sexual selection. Sperm may be used in direct proportion to their numerical representation within the fertilization set or with a bias toward one male over another. Previous theoretical treatments have assumed a single sperm-storage organ, but many taxa possess multiple organs or store sperm within multiple regions of the reproductive tract. In Drosophila, females store sperm in two distinct storage organ types: the seminal receptacle (SR) and the paired spermathecae. Here, we expand previous "raffle" models to describe "fertilization bias" independently for sperm within the SR and the spermathecae and estimate the fertilization set based on the relative contribution of sperm from the different sperm-storage organ types. We apply this model to three closely related species to reveal rapid divergence in the fertilization set and the potential for female sperm choice.

Abstract

How sperm from competing males are used to fertilize eggs is poorly understood yet has important implications for postcopulatory sexual selection. Sperm may be used in direct proportion to their numerical representation within the fertilization set or with a bias toward one male over another. Previous theoretical treatments have assumed a single sperm-storage organ, but many taxa possess multiple organs or store sperm within multiple regions of the reproductive tract. In Drosophila, females store sperm in two distinct storage organ types: the seminal receptacle (SR) and the paired spermathecae. Here, we expand previous "raffle" models to describe "fertilization bias" independently for sperm within the SR and the spermathecae and estimate the fertilization set based on the relative contribution of sperm from the different sperm-storage organ types. We apply this model to three closely related species to reveal rapid divergence in the fertilization set and the potential for female sperm choice.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:Drosophila, cryptic female choice, model, raffle, sperm competition, sperm use
Language:English
Date:October 2013
Deposited On:14 Dec 2015 12:07
Last Modified:28 Apr 2017 01:14
Publisher:University of Chicago Press
ISSN:0003-0147
Funders:National Science Foundation
Additional Information:© 2013 by The University of Chicago
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1086/671782
PubMed ID:24021407

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