Document Detail

Selection for high gamete encounter rates explains the evolution of anisogamy using plausible assumptions about size relationships of swimming speed and duration.
MedLine Citation:
PMID:  16360179     Owner:  NLM     Status:  MEDLINE    
A previous general model describing physical constraints on gamete encounter rates was modified to incorporate assumptions that increased size causes decreased swimming speed and increased fertile period (or other proportional enhancement to gamete fertility). The analysis indicates that with moderately strong size dependence of fertile period and a range of speed dependencies, selection for high encounter rates pressures mating systems that develop any heritable difference in size between the gametes of different mating types to exaggerate the difference and evolve from isogamy to anisogamy. The smaller gamete has an optimal size, but the larger faces continuing selection for increased size. This continues to a size that is estimated to be sufficient to make pheromone production of sperm attractants practical. This mechanism then bridges the missing link between isogametes and oogamy in a previous analysis of the effectiveness of pheromones in explaining the success of male-female mating systems. The evolution and success of anisogamy and oogamy can be explained solely on the basis of physical effects on the encounter process.
David B Dusenbery
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Publication Detail:
Type:  Journal Article     Date:  2005-12-19
Journal Detail:
Title:  Journal of theoretical biology     Volume:  241     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-12     Completed Date:  2007-03-29     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  33-8     Citation Subset:  IM    
School of Biology, Georgia Tech, Atlanta, GA 30332-0230, USA.
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MeSH Terms
Cell Size
Germ Cells / cytology*
Models, Biological
Ovum / cytology
Reproduction / physiology*
Selection, Genetic*
Sperm Motility*
Sperm-Ovum Interactions*
Spermatozoa / cytology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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