Testing the hybrid superiority hypothesis in crested and marbled newts

Cogălniceanu, Dan; Stănescu, Florina; Arntzen, Jan W.

doi:10.1111/jzs.12322

Cited by 12 publications

(9 citation statements)

References 62 publications

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“…The hybrid crosses did not exhibit reduced viability of eggs or larvae, or reduced survival to metamorphosis. However, we recognize that hybrid vigor is common (Birchler et al 2010, Cogȃlniceanu et al 2020, Fitzpatrick and Shaffer 2007, Hotz et al 1999, Nzau Matondo et al 2007, and that fitness consequences, if any, are more likely to manifest in natural habitats. Indeed, in species and populations that exhibit divergent traits linked to their local environments, hybrids are typically expected to have inferior fitness in either parental habitat (Moser et al 2016).…”

Section: Discussionmentioning

confidence: 98%

Adaptive differentiation in life history traits despite propensity for hybridization in two sister salamanders

Fitzgerald

Bracken

Ascanio

et al. 2022

Preprint

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Hybridization can have a profound negative effect on population fitness when species exhibit divergence in adaptive traits. The Streamside salamander, Ambystoma barbouri, and the Smallmouth salamander, A. texanum, are closely related species differentiated primarily by breeding habitat and reproduction-related traits, but previous work suggests patterns of hybridization and introgression between them. Here we investigate whether 1) hybridization occurs between the two species in laboratory settings, 2) their divergent reproduction-related traits are retained under a common treatment, and 3) hybrid offspring exhibit similar fitness as their non-hybrid counterparts. We bred conspecific and heterospecific pairs of A. barbouri and A. texanum and raised hybrid and non-hybrid offspring to metamorphosis. Reproduction-related traits such as oviposition location and clutch size remained well differentiated between the two species. Heterospecific pairs hybridized readily, at similar rates to conspecific pairs. The hybrid larvae generally exhibited a maternal effect and, less frequently, intermediate phenotypes with respect to measured traits. Hybrid larvae did not exhibit reduced fitness as measured by survival to metamorphosis. Our results suggest that traits differentiating A. barbouri and A. texanum are likely genetically determined despite the lack of reproductive isolation between them. This suggests that the generally parapatric distribution of the two species, often paired with abrupt transition in traits, might be driven by selection on these traits in local habitats. Further, the maternal effect and consequent lack of intermediate phenotypes observed for several traits likely reduces the negative effect of hybridization in locally adapted populations.

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Section: Discussionmentioning

confidence: 98%

Adaptive differentiation in life history traits despite propensity for hybridization in two sister salamanders

Fitzgerald

Bracken

Ascanio

et al. 2022

Preprint

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“…Luzitânia 00000-000 São Paulo, Brazil. 13 Programa de Pós-Graduação, Ciências da Saúde e Biológicas, Universidade Federal do Vale do São Francisco, Av. José de Sá Maniçoba, S/N -Centro 56304-917 -Petrolina, Brazil.…”

Section: Acknowledgementsunclassified

“…Most animal hybrid morphology studies also feature a single pair of parental species and the resulting hybrids (e.g. [8, 11, 12, 13, 14, 15, 16]), but there is also interest in understanding how the hybrid phenotype varies with the genetic distances between closely-related parental species [8, 17].…”

Section: Introductionmentioning

confidence: 99%

Pelage Variation and Morphometrics of Closely RelatedCallithrixMarmoset Species and Their Hybrids

Malukiewicz

Warren

Boere

et al. 2023

Preprint

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Background: Hybrids are expected to show greater phenotypic variation than their parental species, yet how hybrid phenotype expression varies with genetic distances in closely-related parental species remains surprisingly understudied. Here we study pelage and morphometric trait variation in anthropogenic hybrids between four species of BrazilianCallithrixmarmosets, a relatively recent primate radiation. Marmoset species are distinguishable by pelage phenotype and level of morphological specialization for eating tree exudates. Here, we (1) describe qualitative phenotypic pelage differences between parental species and hybrids; (2) test whether significant quantitative differences exist between parental and hybrid morphometric phenotypes; and (3) determine which hybrid morphometic traits show heterosis, dysgenesis, trangression, or intermediacy relative to the parental trait. For morphometric traits, we investigated both cranial and post-cranial traits, particularly as most hybrid morphological studies focus on the former instead of the latter. Finally, we estimate mitogenomic distances between marmoset species from previously published data. Results: Hybrid facial and overall body pelage variation reflected coloration and patterns seen in parental species. In morphometric traits,C. jacchusandC. penicillatawere the most similar to each other, whileC. auritawas the most distinct, andC. geoffroyitrait measures fell between these other species. Most traits inC. jacchusxC. penicillatahybrids showed either heterosis or were intermediate relative to the parental trait values. We observed heterosis and dygenesis in traits ofC. penicillataxC. geoffroyihybrids. Trangressive segregation was observed in hybrids ofC. auritaand the other species. These hybrids were alsoC. aurita-like for a number of traits. Genetic distance was closest betweenC. jacchusandC. penicillataand farthest betweenC. auritaand the other species. Conclusion: We attributed significant phenotypic differences between marmoset species to differences in morphological exudivory specialization in these species. Our results suggest that intermediate hybrid traits relative to the parental trait values are more likely in crosses between species with relatively lesser genetic distance. More extreme phenotypic variation is more likely in parental species with greater genetic distance, with transgressive traits appearing in hybrids of the most genetically distant parental species. We further suggest that that less developmental disturbances can be expected in hybrids of more recently diverged parental species.

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“…Natural hybrid populations could consist mostly of F 1 hybrid generation, as in the case of two genetically well-separated species with different ecology and morphology, T. cristatus and T. marmoratus, which hybridize in western France (see [ 35 ] and references therein). These hybrids express typical heterosis; they are larger than the parental species and mostly sterile [ 36 ]. The opposite example is that of T. ivanbureschi × T. macedonicus hybrid populations on the Balkan Peninsula [ 27 , 37 ], which consist of an unknown generation of hybrid individuals derived from a long history of mutual hybrid crossings and backcrossing with both parental species [ 27 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

The Reproductive Success of Triturus ivanbureschi × T. macedonicus F1 Hybrid Females (Amphibia: Salamandridae)

Vučić

Ivanović

Ajduković

et al. 2022

Animals

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Two large-bodied newt species, Triturus ivanbureschi and T. macedonicus, hybridize in nature across the Balkan Peninsula. Consequences of hybridization upon secondary contact of two species include species displacement and asymmetrical introgression of T. ivanbureschi mtDNA. We set an experimental reciprocal cross of parental species and obtained two genotypes of F1 hybrids (with T. ivanbureschi or T. macedonicus mtDNA). When hybrids attained sexual maturity, they were engaged in mutual crossings and backcrossing with parental species. We followed reproductive traits over two successive years. Our main aim was to explore the reproductive success of F1 females carrying different parental mtDNA. Additionally, we tested for differences in reproductive success within female genotypes depending on the crossing with various male genotypes (hybrids or parental species). Both female genotypes had similar oviposition periods, number of laid eggs and hatched larvae but different body and egg sizes. Overall reproductive success (percentage of egg-laying females and viability of embryos) was similar for both genotypes. The type of crossing led to some differences in reproductive success within female genotypes. The obtained results suggest that processes that led to exclusion of T. macedonicus mtDNA in natural populations may be related to the survival at postembryonic stages of F2 generation or reproductive barriers that emerged in subsequent hybrid generations.

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Testing the hybrid superiority hypothesis in crested and marbled newts

Cited by 12 publications

References 62 publications

Adaptive differentiation in life history traits despite propensity for hybridization in two sister salamanders

Adaptive differentiation in life history traits despite propensity for hybridization in two sister salamanders

Pelage Variation and Morphometrics of Closely RelatedCallithrixMarmoset Species and Their Hybrids

The Reproductive Success of Triturus ivanbureschi × T. macedonicus F1 Hybrid Females (Amphibia: Salamandridae)

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