Geographically distinct patterns of reproductive isolation and hybridization in two sympatric species of the<i>Jaera albifrons</i>complex (marine isopods)

Ribardière, Ambre; Daguin‐Thiébaut, Claire; Houbin, Céline; Coudret, Jérôme; Broudin, Caroline; Timsit, Olivier; Broquet, Thomas

doi:10.1002/ece3.3106

Cited by 12 publications

(42 citation statements)

References 44 publications

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“…However, as shown in Table 2 By contrast, there was no ecological isolation in mixed J. albifrons / J. praehirsuta populations 360 from Normandy (Table 2, data from Ribardière et al, 2017) and there we found sexual isolation to be half of that found in Brittany (probability of success = 0.73 vs. 0.33 for intra-and interspecific crosses, !,! "#$%&'( = 0.37, Fig.…”

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confidence: 70%

“…They also provided a direct test that J. albifrons (or J. praehirsuta) from across our two separate regions belong to the same biological species, an implicit assumption of this study and most previous investigations with this system (Solignac 1969b;Ribardière et al 2017). The reproductive output of these crosses was recorded as described above for no choice crosses within each region.…”

Section: No-choice Crosses Across Regionsmentioning

confidence: 99%

“…First, because J. albifrons and J. praehirsuta in Brittany do not have strictly non-overlapping 225 habitats, we used survey data from Ribardière et al (2017) to quantify ecological isolation as…”

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confidence: 99%

“…Coyne & Orr, 1998). Ribardière et al (2017) discussed the peculiar nature of the hybridizing populations, 580 emphasizing that they seem to receive no influx of individuals from pure parental populations, and that no fine-scale ecological differentiation was observed (the two species are repeatedly found to be intermingled in a number of different sites). The authors suggested sexual and post-zygotic isolation as two potential forces somehow acting to keep the species isolated.…”

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Sexual isolation with and without ecological isolation in marine isopodsJ. albifronsandJ. praehirsuta

Ribardière

Pabion

Coudret

et al. 2018

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Sexual isolation is often coupled with other barriers, and sexual isolation mechanisms can be intrinsically tied to ecological conditions or natural selection against heterospecific gene flow. The independence and relative strength of sexual isolation are thus difficult to assess. Here we take advantage of a pair of isopod species (Jaera albifrons and J. praehirsuta) that show sexual isolation 5 and coexist in populations where they share the same habitat or not (i.e. without or with ecological isolation). Using no-choice trials and a free-choice experimental population, we estimated the strength of sexual isolation between J. albifrons and J. praehirsuta individuals originating from these different ecological contexts. We found that sexual isolation is strong in presence and absence of ecological isolation, but that it is asymmetric and fails to prevent gene flow entirely. Post-zygotic 10 barriers were low, and there was no sexual isolation within J. praehirsuta across habitats. The J.albifrons / J. praehirsuta species pair thus provides an example where the role of sexual isolation as a barrier to gene flow i) does not depend upon current ecological isolation, ii) seems to have evolved independently of local ecological conditions and hybridization costs, but iii) is unable to complete speciation entirely on its own. 15

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confidence: 70%

Section: No-choice Crosses Across Regionsmentioning

confidence: 99%

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confidence: 99%

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Sexual isolation with and without ecological isolation in marine isopodsJ. albifronsandJ. praehirsuta

Ribardière

Pabion

Coudret

et al. 2018

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“…Hybridization happens in these populations (Solignac, 1969a) and results in various levels of introgression (Ribardière, 2017;Ribardière et al, 2017), pointing toward reduced reproductive isolation. Interestingly however, in these hybridizing populations most males bear sexual traits that are clearly identified as belonging to one or the other species and intermediate phenotypes are…”

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Sexual isolation with and without ecological isolation in marine isopods Jaera albifrons and J. praehirsuta

Ribardière

Pabion

Coudret

et al. 2019

J of Evolutionary Biology

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To cite this version:Ambre Ribardière, Elsa Pabion, Jérôme Coudret, Claire Daguin-Thiébaut, Céline Houbin, et al.. Sexual isolation with and without ecological isolation in marine isopods Jaera albifrons and J. praehirsuta. AbstractSexual barriers associated with mate choice are often found to be associated with some level of ecological isolation between species. The independence and relative strength of sexual isolation are thus difficult to assess. Here we take advantage of a pair of marine isopod species (Jaera albifrons and J. praehirsuta) that show sexual isolation and coexist in populations where they share 20 the same microhabitat or not (i.e. without or with ecological isolation). We estimated the strength of sexual isolation between J. albifrons and J. praehirsuta using no-choice trials and a multiple-choice experimental population. We found that sexual isolation is strong in both the presence and absence of ecological isolation, but that it is asymmetric and fails to prevent interspecific gene flow entirely.First-generation intrinsic post-zygotic barriers were low, and there was no sexual isolation within J. 25 praehirsuta across habitats. The J. albifrons / J. praehirsuta species pair thus provides an example where the role of sexual isolation as a barrier to gene flow i) does not depend upon current ecological isolation, ii) seems to have evolved independently of local ecological conditions, but iii) is insufficient to complete speciation entirely on its own. platform at Station Biologique de Roscoff and was funded by the French Agence Nationale de la Recherche (grant ANR-13-JSV7-0001-01 to T.B.). 625 Author contributions Conceptualization and methodology: AR and TB. Field sampling and species identification: AR, EP, JC, CH, SL and TB. Crossing experiments and maintenance of the individuals in the laboratory: AR, EP, JC, CH, SH, and TB. Genotyping and phenotyping: AR, EP, JC, CDT, CH and TB. Analyses and 630 writing: AR, EP, and TB. Supervision, project administration and funding acquisition: TB.

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Reproductive isolation between two cryptic sponge species in New Zealand: high levels of connectivity and clonality shape Tethya species boundaries

2021

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Geographically distinct patterns of reproductive isolation and hybridization in two sympatric species of theJaera albifronscomplex (marine isopods)

Cited by 12 publications

References 44 publications

Sexual isolation with and without ecological isolation in marine isopodsJ. albifronsandJ. praehirsuta

Sexual isolation with and without ecological isolation in marine isopodsJ. albifronsandJ. praehirsuta

Sexual isolation with and without ecological isolation in marine isopods Jaera albifrons and J. praehirsuta

Reproductive isolation between two cryptic sponge species in New Zealand: high levels of connectivity and clonality shape Tethya species boundaries

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