Document Detail

Female sperm use and storage between fertilization events drive sperm competition and male ejaculate allocation.
MedLine Citation:
PMID:  25307988     Owner:  NLM     Status:  Publisher    
Sperm competition theory has traditionally focused on how male allocation responds to female promiscuity, when males compete to fertilize a single clutch of eggs. Here, we develop a model to ask how female sperm use and storage across consecutive reproductive events affects male ejaculate allocation and patterns of mating and paternity. In our model, sperm use (a single parameter under female control) is the main determinant of sperm competition, which alters the effect of female promiscuity on male success and, ultimately, male reproductive allocation. Our theory reproduces the general pattern predicted by existing theory that increased sperm competition favors increased allocation to ejaculates. However, our model predicts a negative correlation between male ejaculate allocation and female promiscuity, challenging the generality of a prevailing expectation of sperm competition theory. Early models assumed that the energetic costs of pre-copulatory competition and the level of sperm competition are both determined by female promiscuity, which leads to an assumed co-variation between these two processes. By modeling pre-copulatory costs and sperm competition independently, our theoretical framework allows us to examine how male allocation should respond independently to variation in sperm competition and energetic trade-offs in mating systems that have been overlooked in the past. This article is protected by copyright. All rights reserved.
Gustavo S Requena; Suzanne H Alonzo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-10-11
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  -     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-10-13     Completed Date:  -     Revised Date:  2014-10-14    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
This article is protected by copyright. All rights reserved.
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