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Interspecific variation in ejaculate allocation and associated effects on female fitness in seed beetles
 

Summary: Interspecific variation in ejaculate allocation and associated
effects on female fitness in seed beetles
J. L. RO¨ NN, M. KATVALA & G. ARNQVIST
Evolutionary Biology Centre, Department of Animal Ecology, Uppsala University, Sweden
Introduction
Sperm competition occurs when sperm from two or more
males compete over the fertilization of a given set of ova
(Parker, 1998), and sperm competition theory predicts
that several factors should affect the evolution of the
mean amount of resources that males invest in sperm
and ejaculate production (Engqvist & Reinhold, 2005). A
key factor is clearly the sperm competition regime, in
particular the sperm competition risk (i.e. the probability
of female remating) and the intensity of sperm compe-
tition (i.e. the average number of ejaculates competing
for a given set of ova). For example, Parker et al. (1996)
modelled systems where male fertilization success is
directly proportional to its contribution to the total
number of competing sperm (i.e. a fair raffle), and
showed that total ejaculate expenditure should increase

  

Source: Arnqvist, Göran - Department of Animal Ecology, Uppsala Universitet

 

Collections: Environmental Sciences and Ecology