Rise and Fall of a Hybrid Zone: Implications for the Roles of Aggression, Mate Choice, and Secondary Succession

Robbins, Travis R.; Walker, Lorelei E.; Karl, Stephen A.; Schrey, Aaron W.; McCoy, Earl D.; Mushinsky, Henry R.

doi:10.1093/jhered/est093

Cited by 18 publications

(14 citation statements)

References 44 publications

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“…3). Temporal changes in the relative densities of populations are implicated in the hybridization between S. undulatus and S. woodi in Florida, where forest clear-cuts likely caused dramatic population density differences (Robbins et al 2014). Population densities of S. tristichus at the southern end of the hybrid zone likely increased in response to the encroachment of woody vegetation in this region.…”

Section: Discussionmentioning

confidence: 99%

Evidence for concerted movement of nuclear and mitochondrial clines in a lizard hybrid zone

et al. 2017

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Moving hybrid zones provide compelling examples of evolution in action, yet long-term studies that test the assumptions of hybrid zone stability are rare. Using replicated transect samples collected over a 10-year interval from 2002 to 2012, we find evidence for concerted movement of genetic clines in a plateau fence lizard hybrid zone (Sceloporus tristichus) in Arizona. Cline-fitting analyses of SNP and mtDNA data both provide evidence that the hybrid zone shifted northward by approximately 2 km during the 10-year interval. For each sampling period, the mtDNA cline centre is displaced from the SNP cline centre and maintaining an introgression distance of approximately 3 km. The northward expansion of juniper trees into the Little Colorado River Basin in the early 1900s provides a plausible mechanism for hybrid zone formation and movement, and a broadscale quantification of recent land cover change provides support for increased woody species encroachment at the southern end of the hybrid zone. However, population processes can also contribute to hybrid zone movement, and the current stability of the ecotone habitats in the centre of the hybrid zone suggests that movement could decelerate in the future.

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Section: Discussionmentioning

confidence: 99%

Evidence for concerted movement of nuclear and mitochondrial clines in a lizard hybrid zone

et al. 2017

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“…(Robbins et al . ). The low observed proportion of F1 individuals suggests potential selection against hybrids.…”

Section: Discussionmentioning

confidence: 97%

Geographic variation in hybridization and ecological differentiation between three syntopic, morphologically similar species of montane lizards

et al. 2016

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To understand factors shaping species boundaries in closely related taxa, a powerful approach is to compare levels of genetic admixture at multiple points of contact and determine how this relates to intrinsic and extrinsic factors, such as genetic, morphological and ecological differentiation. In the Australian Alps, the threatened alpine bog skink Pseudemoia cryodroma co-occurs with two morphologically and ecologically similar congeners, P. entrecasteauxii and P. pagenstecheri, and all three species are suspected to hybridize. We predicted that the frequency of hybridization should be negatively correlated with genetic divergence, morphological differentiation and microhabitat separation. We tested this hypothesis using a mitochondrial locus, 13 microsatellite loci, morphological and microhabitat data and compared results across three geographically isolated sites. Despite strong genetic structure between species, we detected hybridization between all species pairs, including evidence of backcrossed individuals at the two sites where all three species are syntopic. Hybridization frequencies were not consistently associated with genetic, morphological or ecological differentiation. Furthermore, P. entrecasteauxii and P. pagenstecheri only hybridized at the two sites where they are syntopic with P. cryodroma, but not at the largest site where P. cryodroma was not recorded, suggesting that P. cryodroma may serve as a bridging species. This study reveals the complex dynamics within a three species hybrid zone and provides a baseline for assessing the impact of climate change and anthropogenic habitat modification on future hybridization frequencies.

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“…For instance, it may influence the outcome of competitive encounters, leading to narrowing or broadening of hybrid zones and deciding into which parental species' territory the hybrid zone will expand, as well as with which parental species the hybrids will more often introgress. Hybridization has been reported to influence animal personalities, with hybrids having been described as exhibiting increased or decreased levels of aggression than either of their parental species in salmon (Einum and Fleming 1997), warblers (Pearson and Rohwer 2000), manakins (McDonald et al 2001), and lizards (Robbins et al 2014). We are not aware of such personality effects ever having been interpreted in the light of intragenomic conflict.…”

Section: Discussionmentioning

confidence: 99%

Sexual selection modulates genetic conflicts and patterns of genomic imprinting

2017

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Recent years have seen a surge of interest in linking the theories of kin selection and sexual selection. In particular, there is a growing appreciation that kin selection, arising through demographic factors such as sex‐biased dispersal, may modulate sexual conflicts, including in the context of male–female arms races characterized by coevolutionary cycles. However, evolutionary conflicts of interest need not only occur between individuals, but may also occur within individuals, and sex‐specific demography is known to foment such intragenomic conflict in relation to social behavior. Whether and how this logic holds in the context of sexual conflict—and, in particular, in relation to coevolutionary cycles—remains obscure. We develop a kin‐selection model to investigate the interests of different genes involved in sexual and intragenomic conflict, and we show that consideration of these conflicting interests yields novel predictions concerning parent‐of‐origin specific patterns of gene expression and the detrimental effects of different classes of mutation and epimutation at loci underpinning sexually selected phenotypes.

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Rise and Fall of a Hybrid Zone: Implications for the Roles of Aggression, Mate Choice, and Secondary Succession

Cited by 18 publications

References 44 publications

Evidence for concerted movement of nuclear and mitochondrial clines in a lizard hybrid zone

Evidence for concerted movement of nuclear and mitochondrial clines in a lizard hybrid zone

Geographic variation in hybridization and ecological differentiation between three syntopic, morphologically similar species of montane lizards

Sexual selection modulates genetic conflicts and patterns of genomic imprinting

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