#  Sexual Selection and Speciation 

 



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### Pre-copulatory reproductive isolation

   ![Pre-copulatory reproductive isolation](/sites/g/files/omnuum6376/files/styles/hwp_1_1__360x360_scale/public/hoekstra/files/pre-copulatory.png?itok=wgYdO638) 

 

Mating preferences can facilitate speciation if they promote assortative mating and prevent hybridization. We are interested in how mate preferences evolve and generate reproductive isolation between species. Some sister species of *Peromyscus* can produce viable and fertile hybrids in the lab, but rarely produce hybrids in the wild, even when sympatric. We are currently studying the traits used in species recognition in one such species pair, *Peromyscus leucopus* and *P. gossypinus*. (Photo credit: Emily Jacobs-Palmer)

### Post-copulatory reproductive traits

   ![Post-copulatory reproductive traits](/sites/g/files/omnuum6376/files/styles/hwp_1_1__360x360_scale/public/hoekstra/files/post-copulatory.png?itok=QLxFhgpx) 

 

Taking advantage of the diversity of mating systems in the genus *Peromyscus*, our lab is studying the genetic architecture of reproductive traits influenced by post-copulatory sexual selection. Specifically, we are investigating the molecular underpinnings of male reproductive traits that are correlated with mating system such as sperm morphology and performance. We take advantage of the well-characterized variation in mating system across the *Peromyscus* genus, which allows us to address the roles of sperm competition and sexual conflict in reproductive trait evolution. (Photo credit: Heidi Fisher and James Weaver).