Dr. Sam Tazzyman
My PhD thesis considers the evolution and the consequences of mate choice across a variety of taxa, using game theoretic, population genetic, and quantitative genetic modelling techniques.
Part I is about the evolution of mate choice. In chapter 2, a population genetic model shows that mate choice is even beneﬁcial in self-fertilising species such as Saccharomyces yeast. In chapter 3, a game theoretic model shows that female choice will be strongly dependent upon whether the beneﬁts are ﬁxed, so that females receive the same ﬁtness boost from a mating with a given male regardless of how many matings that male has, or dilutable, where the more females a male mates with, the lower the expected beneﬁt to each. This leads to the prediction that mating skew should be higher in species in which the beneﬁts of mate choice are hypothesised to be due to good genes.
Part II is about the consequences of mate choice. The theoretical prediction from chapter 3 is borne out by a literature review of studies of wild populations of birds in chapter 4. In chapter 5, a quantitative genetic model about poison-dart frogs suggests that sexual selection can speed up the eﬀect of random genetic drift. This may be of more general importance, further widening the evolutionary impact of sexual selection. Finally, in chapter 6, a game theoretic model of sperm competition shows that pre-copulatory mate choice can also have evolutionary eﬀects upon post-copulatory behaviour, aﬀecting the optimal ejaculate expenditure of males.
Overall, mate choice is shown to be an important evolutionary force, with wide-ranging ramiﬁcations across diverse taxa, and eﬀects so varied as to include the evolution of sex, the genetic variation in species, speciation, and post-copulatory behaviour, amongst others. These eﬀects can be eﬀectively explored using mathematical modelling. I have been fortunate enough to secure funding for the calendar year 2011 under the EPSRC PhD+ scheme, so I will remain based in CoMPLEX working on similar problems to those which I studied during my PhD
List of publications:
“The Evolution of Continuous Variation in Ejaculate Expenditure Strategy”
S. J. Tazzyman, T. Pizzari, R. M. Seymour and A. Pomiankowski
American Naturalist 2009, Vol. 174, pp. E71-E82
“Sexual selection can increase the effect of random genetic drift - a quantitative genetic model of polymorphism in Oophaga pumilio, the strawberry poison-dart frog”
S. J. Tazzyman & Y. Iwasa
Evolution 2010, Vol. 64, pp. 1719-1728
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