scholarly journals Opposing effects of sperm viability and velocity on the outcome of sperm competition

2012 ◽  
Vol 23 (4) ◽  
pp. 820-826 ◽  
Author(s):  
Chad C. Smith
Keyword(s):  
Sperm Competition ◽  
Sperm Viability ◽  
Opposing Effects

scholarly journals Sperm Viability Matters in Insect Sperm Competition

2005 ◽  
Vol 15 (3) ◽  
pp. 271-275 ◽  
Author(s):  
Francisco Garcı́a-González ◽  
Leigh W. Simmons
Keyword(s):  
Sperm Competition ◽  
Sperm Viability ◽  
Insect Sperm

scholarly journals Socially cued seminal fluid gene expression mediates responses in ejaculate quality to sperm competition risk

2017 ◽  
Vol 284 (1861) ◽  
pp. 20171486 ◽  
Author(s):  
Leigh W. Simmons ◽  
Maxine Lovegrove
Keyword(s):  
Gene Expression ◽  
Sperm Competition ◽  
Seminal Fluid ◽  
Protein Composition ◽  
Theoretical Models ◽  
Fluid Composition ◽  
Sperm Viability ◽  
Considerable Evidence ◽  
Sperm Competition Risk ◽  
Seminal Fluid Protein

There is considerable evidence that males will increase the number of sperm ejaculated in response to sperm competition risk. However, whether they have the capacity to adjust seminal fluid components of the ejaculate has received less attention. Male crickets ( Teleogryllus oceanicus ) have been shown to adjust the viability of sperm in their ejaculate in response to sperm competition risk. Here we show that socially mediated plasticity in sperm viability is probably due, at least in part, to male adjustments in the protein composition of the seminal fluid. Seven seminal fluid protein genes were found to have an increased expression in males exposed to rival calls. Increased expression of these genes was correlated with increased sperm viability in whole ejaculates, and gene knockdown confirmed that at least one of these proteins promotes sperm viability. Our results lend support for recent theoretical models that predict complex responses in male allocation to seminal fluid composition in response to sperm competition risk.

scholarly journals Sperm Viability and Sperm Competition in Insects

2002 ◽  
Vol 12 (2) ◽  
pp. 121-123 ◽  
Author(s):  
F.M Hunter ◽  
T.R Birkhead
Keyword(s):  
Sperm Competition ◽  
Sperm Viability
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