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letters to nature 692 NATURE |VOL 411 |7 JUNE 2001 |www.nature.com

Summary: letters to nature
692 NATURE |VOL 411 |7 JUNE 2001 |www.nature.com
does not preclude male territory quality being correlated with the
number of deleterious alleles they bear and, as can be seen from Fig.
1 and equation (6), strong effects on load do not require strong
correlations. Although the calculations that have been presented are
based on best of n mate choice, mathematically the results are much
more general. Any form of differential mating success that leads to
the average father bearing fewer deleterious mutations than the
average male will have similar effects.
Although sexual selection and differential male mating success is
normally discussed in relation to animals, there is no reason why the
mechanism outlined here cannot operate in plants. The precondi-
tions are certainly satis®ed28
Finally, from the perspective of viability, sexual selection often
leads to the evolution of poorly adapted traits and destructive
competition for mates. These are not a further cost of sex. Any
asexual lineage arising from a sexual population would be very
unlikely to lose costly female secondary sexual characteristics at the


Source: Agrawal, Aneil F. - Department of Ecology and Evolutionary Biology, University of Toronto


Collections: Environmental Sciences and Ecology