scholarly journals Evolutionary Modeling Predicts a Decrease in Postcopulatory Sperm Viability as a Response to Increasing Levels of Sperm Competition

2012 ◽  
Vol 179 (5) ◽  
pp. 667-677 ◽  
Author(s):  
Leif Engqvist
Keyword(s):  
Sperm Competition ◽  
Sperm Viability ◽  
Evolutionary Modeling

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

scholarly journals Influence of Sperm Number Per Straw on the Post-Thaw Sperm Viability and Fertility of Swedish Red and White A.I. Bulls

1996 ◽  
Vol 37 (4) ◽  
pp. 461-470
Author(s):  
A. Januskauskas ◽  
L. Söderquist ◽  
M. G. Håård ◽  
M. Ch ◽  
N. Lundeheim ◽  
...  
Keyword(s):  
Sperm Viability ◽  
Sperm Number

scholarly journals Sperm Competition in the Absence of Fertilization in Caenorhabditis elegans

Genetics ◽  
1999 ◽  
Vol 152 (1) ◽  
pp. 201-208 ◽  
Author(s):  
Andrew Singson ◽  
Katherine L Hill ◽  
Steven W L’Hernault
Keyword(s):  
Caenorhabditis Elegans ◽  
Sperm Competition ◽  
Sperm Function ◽  
Sperm Precedence ◽  
Wild Type ◽  
Nematode Caenorhabditis Elegans ◽  
C Elegans ◽  
Normal Sperm ◽  
Self Fertilization ◽  
Competition Assays

Abstract Hermaphrodite self-fertilization is the primary mode of reproduction in the nematode Caenorhabditis elegans. However, when a hermaphrodite is crossed with a male, nearly all of the oocytes are fertilized by male-derived sperm. This sperm precedence during reproduction is due to the competitive superiority of male-derived sperm and results in a functional suppression of hermaphrodite self-fertility. In this study, mutant males that inseminate fertilization-defective sperm were used to reveal that sperm competition within a hermaphrodite does not require successful fertilization. However, sperm competition does require normal sperm motility. Additionally, sperm competition is not an absolute process because oocytes not fertilized by male-derived sperm can sometimes be fertilized by hermaphrodite-derived sperm. These results indicate that outcrossed progeny result from a wild-type cross because male-derived sperm are competitively superior and hermaphrodite-derived sperm become unavailable to oocytes. The sperm competition assays described in this study will be useful in further classifying the large number of currently identified mutations that alter sperm function and development in C. elegans.

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