Behavioural isolation may facilitate homoploid hybrid speciation in cichlid fish

Selz, Oliver M.; Thommen, Rahel; Maan, Martine E.; Seehausen, Ole

doi:10.1111/jeb.12287

Cited by 53 publications

(62 citation statements)

References 114 publications

(167 reference statements)

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“…Intermediate phenotype preferences by hybrids have been recorded for fish species (Selz et al . ) and could have been involved in C. darwiniana rise. Furthermore, the two C. darwiniana lineages differ from each other, but within each population, the morphology is quite homogenous.…”

Section: Discussionmentioning

confidence: 99%

Hybridization promotes speciation in Coenonympha butterflies

et al. 2015

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Hybridization has become a central element in theories of animal evolution during the last decade. New methods in population genomics and statistical model testing now allow the disentangling of the complexity that hybridization brings into key evolutionary processes such as local adaptation, colonization of new environments, species diversification and extinction. We evaluated the consequences of hybridization in a complex of three alpine butterflies in the genus Coenonympha, by combining morphological, genetic and ecological analyses. A series of approximate Bayesian computation procedures based on a large SNP data set strongly suggest that the Darwin's Heath (Coenonympha darwiniana) originated through hybridization between the Pearly Heath (Coenonympha arcania) and the Alpine Heath (Coenonympha gardetta) with different parental contributions. As a result of hybridization, the Darwin's Heath presents an intermediate morphology between the parental species, while its climatic niche seems more similar to the Alpine Heath. Our results also reveal a substantial genetic and morphologic differentiation between the two geographically disjoint Darwin's Heath lineages leading us to propose the splitting of this taxon into two different species.

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Section: Discussionmentioning

confidence: 99%

Hybridization promotes speciation in Coenonympha butterflies

et al. 2015

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“…A detailed genotyping protocol is described by Selz et al [40]. On average, a total of 8 + 3 (standard deviation, s.d.…”

Section: (D) Parentage Assignmentmentioning

confidence: 99%

Differences in male coloration are predicted by divergent sexual selection between populations of a cichlid fish

et al. 2016

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Female mating preferences can influence both intraspecific sexual selection and interspecific reproductive isolation, and have therefore been proposed to play a central role in speciation. Here, we investigate experimentally in the African cichlid fish Pundamilia nyererei if differences in male coloration between three para-allopatric populations (i.e. island populations with gene flow) of P. nyererei are predicted by differences in sexual selection by female mate choice between populations. Second, we investigate if female mating preferences are based on the same components of male coloration and go in the same direction when females choose among males of their own population, their own and other conspecific populations and a closely related para-allopatric sister-species, P. igneopinnis. Mate-choice experiments revealed that females of the three populations mated species-assortatively, that populations varied in their extent of population-assortative mating and that females chose among males of their own population based on different male colours. Females of different populations exerted directional intrapopulation sexual selection on different male colours, and these differences corresponded in two of the populations to the observed differences in male coloration between the populations. Our results suggest that differences in male coloration between populations of P. nyererei can be explained by divergent sexual selection and that population-assortative mating may directly result from intrapopulation sexual selection.

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“…Beyond this basic definition, complete agreement is lacking on key aspects of the process, such as the relative proportions of each parental genome present in a hybrid species, the mechanisms leading to reproductive isolation (RI), the degree of RI or the role played by hybridization in the process (Rieseberg, 1997;Abbott et al, 2010). While our understanding of HHS has been improved by detailed evolutionary case studies documented by recent reviews (Abbott et al, 2013;Yakimowski and Rieseberg, 2014;Payseur and Rieseberg, 2016) and empirical studies focused on mechanisms leading to HHS (Renaut et al, 2014;Selz et al, 2014;Lukhtanov et al, 2015), there is controversy concerning the criteria to identify and demonstrate HHS, and even the range of situations that HHS might encompass.…”

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confidence: 99%

“…Furthermore, we think that if there is evidence that a hybridization event has given rise to an established, persistent, morphologically and ecologically distinct hybrid lineage, the recognition of this fact should not be compromised by whether or not we can demonstrate that hybridization was directly the cause of RI. Hybridization can be causative of mechanisms that contribute to enhancing RI in hybrid lineages, for example, the sorting of chromosomal rearrangements along the recombinational speciation model (Lai et al, 2005;Lukhtanov et al, 2015) or the occurrence of new traits that change mating patterns (Vereecken et al, 2010;Selz et al, 2014;Marques et al, 2016;Ma et al, 2016). In addition, intrinsic changes in the hybrids not directly causing RI between hybrid lineages and their progenitors may ultimately lead to external RI by facilitating the colonization of new niches (Grant, 1981;Gross and Rieseberg, 2005).…”

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confidence: 99%