The Evolution of Asymmetry in Sexual Isolation: A Model and a Test Case

Arnold, Stevan J.; Verrell, Paul A.; Tilley, Stephen G.

doi:10.2307/2410643

Cited by 94 publications

(119 citation statements)

References 31 publications

Supporting

Mentioning

110

Contrasting

Order By: Relevance

“…This contrasts with our observations from the wild of phenodeviants that best can be described as adult intermediates between the two species and, hence, natural rates of hybrid viability may be higher if fertilization success and offspring viability had been investigated with a complete and balanced, symmetric breeding design. Such mortality effects of offspring from a given, but not opposite-sex partner, have been reported for several species of plants and animals (Arnold et al, 1996;Coyne and Orr, 1998;Funk, 1998;Tiffin et al, 2001;Coyer et al, 2002) and may well explain a discrepancy in mortality between field and laboratory bred animals in the current study.…”

Section: Trial Number Proportion Offspring Siredsupporting

confidence: 65%

Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

2009

View full text Add to dashboard Cite

Hybridization between closely related species often leads to reduced viability or fertility of offspring. Complete failure of hybrid offspring (post-zygotic hybrid incompatibilities) may have an important role in maintaining the integrity of reproductive barriers between closely related species. We show elsewhere that in Peron's tree frog, Litoria peronii, males more closely related to a female sire more offspring in sperm competition with a less related rival male. Observations of rare 'phenotypic intermediate' males between L. peronii and the closely related L. tyleri made us suggest that these relatedness effects on siring success may be because of selection arising from risks of costly hybridization between the two species. Here, we test this hypothesis in an extensive sperm competition experiment, which shows that there is no effect of species identity on probability of fertilization in sperm competition trials controlling for sperm concentration and sperm viability. Instead, there was a close agreement between a male's siring success in isolation with a female and his siring success with the same female in competition with a rival male regardless of species identity. Offspring viability and survival, however, were strongly influenced by species identity. Over a 14-day period, hybrid offspring suffered increasing mortality and developed more malformations and an obvious inability to swim and right themselves, leading to compromised probability of survival. Thus, hybridization in these sympatric tree frogs does not compromise fertilization but has a strong impact on offspring viability and opportunity for reinforcement selection on mate choice for conspecific partners.

show abstract

Section: Trial Number Proportion Offspring Siredsupporting

confidence: 65%

Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

2009

View full text Add to dashboard Cite

show abstract

“…Some models of sexual selection predict an equilibrium deviation between male and female values within populations (24,25,33,34). Across related species lying along an equilibrium line or plane, consistent directional natural selection on the male trait(s) would produce a consistent direction of deviation between males and females, maintained by a tension between sexual selection and natural selection on the male trait.…”

Section: Resultsmentioning

confidence: 99%

“…We begin with a univariate model of sexual isolation (24). Let z be a latent male trait (linear combination of traits with invariant coefficients) and y be a latent female preference.…”

Section: Methodsmentioning

confidence: 99%

“…Previous work extended such models to assess the effect of a single linear combination of traits on sexual isolation among populations (24,25). We refer to such a combination as a latent trait.…”

mentioning

confidence: 99%

“…Mating probability between males and females is a function of the distance between male traits and female preferences along all of the latenttrait axes (or equivalently, female traits and male preferences, some combination of both, or any set of quantitative traits for which similarity between males and females determines probability of mating). We use information-criterion statistics to determine the number of latent traits that best explains the observed pattern of sexual isolation and mate choice within and among populations in nine radiations across three taxa (24,(26)(27)(28)(29)(30)(31).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Dimensionality of mate choice, sexual isolation, and speciation

Hohenlohe

Arnold

2010

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

View full text Add to dashboard Cite

Multiple cues, across multiple sensory modalities, are involved in mate choice in a wide range of animal taxa. This multiplicity leads to the prediction that, in adaptive radiations, sexual isolation results from divergence in multiple dimensions. However, difficulties in directly measuring preferences and detecting multiple effects limit our ability to empirically assess the number of independent traits contributing to mate choice and sexual isolation. We present an approach to estimate the dimensionality of sexual isolation using mating trials across groups of related populations. We analyze nine radiations: seven in fruit flies (Drosophila) and one each in salamanders (Desmognathus) and cichlid fishes (Pseudotropheus). We find strong evidence that multiple latent traits-linear combinations of phenotypic traits and preferences-are responsible for the patterns of sexual isolation in all nine radiations but that dimensionality has a strong upper limit. Just two latent traits are implicated in the majority of cases. Mapping along latent trait axes tests predictions of sexual-selection models and allows correlation with specific phenotypic traits and functional components of mate choice. We find support for the role of stabilizing natural selection on the sexually selected (male) traits. In the cichlids, latent-trait axes incorporate male-coloration patterns and exhibit convergence as well as divergence among populations. In the salamanders, temporal patterning in sensory modalities and male vs. female preferences are reflected in different latent-trait axes.behavioral isolation | female preference | multidimensional scaling | prezygotic isolation | sexual selection

show abstract