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Olsen, K. (2021). Ecological and Evolutionary Dynamics of Inbreeding and Outbreeding in a Spermcasting Invertebrate. Retrieved from https://purl.lib.fsu.edu/diginole/2021_Summer_Olsen_fsu_0071E_16690
The ecological and evolutionary factors influencing whether hermaphrodites inbreed or outbreed via self-fertilization or outcrossing has long been a theoretical and empirical focus. Recent theory predicts that the conditions favoring the evolution of self-fertilization from outcrossing should also promote tolerance of biparental inbreeding in species with separate sexes or hermaphrodites with mechanisms of self-incompatibility. Yet, there is little evidence of inbreeding tolerance, especially when individuals have the option to outbreed. We quantified biparental inbreeding in a sessile marine invertebrate (Lissoclinum verrilli) in which individuals have the potential to cast sperm over large distances to avoid inbreeding. Data from progeny arrays and paternity assignments indicate that unlike many animals, individuals tolerated mating with close kin when natal philopatry placed them nearby. Variation in biparental inbreeding and outbreeding across sites spanned nearly the complete range of possible values and resembled rates of self-fertilization and outcrossing reported in self-compatible taxa. Rather than shared ancestry, colony size and proximity determined paternal success within sites, emphasizing the importance of sperm availability and competition to reproductive success in free spawning invertebrates. Positive associations between philopatry, the relatedness among conspecifics, and biparental inbreeding across sites indicate that either individuals could not discriminate kin from non-relatives or that costs associated with avoiding inbreeding and the genetic benefits of inbreeding counterbalanced the negative effects of inbreeding depression. Our results highlight overlap in the dynamics of uni- and biparental mating systems and suggest that natal philopatry and inbreeding tolerance contribute meaningfully to the substantial variation in inbreeding and outbreeding within species of spermcasting marine invertebrates.
A Dissertation submitted to the Department of Biological Science in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Bibliography Note
Includes bibliographical references.
Advisory Committee
Don R. Levitan, Professor Directing Dissertation; Peter Beerli, University Representative; Scott C. Burgess, Committee Member; Joseph Travis, Committee Member; Alice A. Winn, Committee Member.
Publisher
Florida State University
Identifier
2021_Summer_Olsen_fsu_0071E_16690
Olsen, K. (2021). Ecological and Evolutionary Dynamics of Inbreeding and Outbreeding in a Spermcasting Invertebrate. Retrieved from https://purl.lib.fsu.edu/diginole/2021_Summer_Olsen_fsu_0071E_16690