An Evaluation of Narrow Hybrid Zones in Vertebrates

Moore, William S.

doi:10.1086/409995

Cited by 604 publications

(592 citation statements)

References 46 publications

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“…The high abundance of hybrids on intermediate-aged lava flows, coupled with immigrant inviability of vars. glaberrima and incana on new and old lava flows respectively (Morrison and Stacy, 2014), suggests that these ephemeral incana-glaberrima hybrid zones likely best fit the 'geographically bounded hybrid superiority model' (Moore, 1977;Hamilton and Aitken, 2013). This model would predict that growth and survivorship of hybrids in both parental environments are low, a conclusion that is supported by the low frequency of apparent hybrids outside of intermediate-aged lava flows.…”

Section: Intraspecific Hybrid Zones On Intermediate-aged Lava Flowsmentioning

confidence: 95%

“…In fact, the abundance of morphologically intermediate trees on other intermediate-aged lava flows on east Hawaiʻi Island (all authors, personal observation) suggests that incana-glaberrima hybrid zones form readily on intermediate-aged substrates at lowmiddle elevations on the island. Aging lava flows represent an intermediate, transitional environment between fresh lava fields and mature rainforests where proximity of trees of the two varieties is increased (Howard et al, 1997), the lack of a stable ecological community promotes hybrid community formation (Moore, 1977) and growth and survivorship of intervarietal hybrids may be at least as high as those of the parental varieties in their home environments (Anderson, 1948;Muller, 1952). The high rainfall at low-middle elevations (Giambelluca et al, 2013) should facilitate succession and coexistence of the two varieties and their hybrids (Kitayama et al, 1997).…”

Section: Intraspecific Hybrid Zones On Intermediate-aged Lava Flowsmentioning

confidence: 99%

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Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai‘i Island

et al. 2016

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Intraspecific hybrid zones involving long-lived woody species are rare and can provide insights into the genetic basis of earlydiverging traits in speciation. Within the landscape-dominant Hawaiian tree, Metrosideros polymorpha, are morphologically distinct successional varieties, incana and glaberrima, that dominate new and old lava flows, respectively, below 1200 me on volcanically active Hawaiʻi Island, with var. glaberrima also extending to higher elevations and bogs. Here, we use morphological measurements on 86 adult trees to document the presence of an incana-glaberrima hybrid zone on the 1855 Mauna Loa lava flow on east Hawaiʻi Island and parent-offspring analysis of 1311 greenhouse seedlings from 71 crosses involving 72 adults to estimate heritabilities and genetic correlations among vegetative traits. Both the variation in adult leaf pubescence at the site and the consistency between adult and offspring phenotypes suggest the presence of two hybrid classes, F 1 s and var. incana backcrosses, as would be expected on a relatively young lava flow. Nine nuclear microsatellite loci failed to distinguish parental and hybrid genotypes. All four leaf traits examined showed an additive genetic basis with moderate to strong heritabilities, and genetic correlations were stronger for the more range-restricted var. incana. The differences between varieties in trait values, heritabilities and genetic correlations, coupled with high genetic variation within but low genetic variation between varieties, are consistent with a multi-million-year history of alternating periods of disruptive selection in contrasting environments and admixture in ephemeral hybrid zones. Finally, the contrasting genetic architectures suggest different evolutionary trajectories of leaf traits in these forms.

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Section: Intraspecific Hybrid Zones On Intermediate-aged Lava Flowsmentioning

confidence: 95%

Section: Intraspecific Hybrid Zones On Intermediate-aged Lava Flowsmentioning

confidence: 99%

Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai‘i Island

et al. 2016

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“…superior, or equivalent to that of the parental forms (Moore, 1977;Hafner et a!., 1983;Barton and Hewitt, 1985). If a reduction in developmental stability accompanies introgression then it is reasonable to conclude that hybrids suffer some loss of fitness compared to the parental taxa.…”

Section: Introductionmentioning

confidence: 99%

Developmental stability, heterozygosity, and fitness in two introduced fire ants (Solenopsis invicta and S. richteri) and their hybrid

Ross

Robertson

1990

Heredity

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“…Numerous authors including Darwin himself-see above quote-contributed to the formulation of the first hypothesis (relating to the production of relatively fit hybrid genotypes). Since Darwin, numerous reviews and books have addressed the concept of hybrid fitness, with some addressing the relative importance or unimportance of hybrid genotypes in the evolutionary and ecological trajectories of plant and animal lineages (Dobzhansky, 1937;Mayr, 1963;Endler, 1977;Moore, 1977;Barton and Hewitt, 1985;Howard, 1993;Arnold and Hodges, 1995;Arnold, 1997Arnold, , 2006Arnold, , 2008Grant and Grant, 2010). The data available for these reviews (particularly those deriving from genomic information) have multiplied exponentially over the past decade due largely to the advances in methodologies for collecting and analyzing DNA sequences (Green et al, 2010) and for deciphering the function of the underlying genes (Rosas et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Hybrid fitness, adaptation and evolutionary diversification: lessons learned from Louisiana Irises

2011

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Estimates of hybrid fitness have been used as either a platform for testing the potential role of natural hybridization in the evolution of species and species complexes or, alternatively, as a rationale for dismissing hybridization events as being of any evolutionary significance. From the time of Darwin's publication of The Origin, through the neo-Darwinian synthesis, to the present day, the observation of variability in hybrid fitness has remained a challenge for some models of speciation. Yet, Darwin and others have reported the elevated fitness of hybrid genotypes under certain environmental conditions. In modern scientific terminology, this observation reflects the fact that hybrid genotypes can demonstrate genotypeÂenvironment interactions. In the current review, we illustrate the development of one plant species complex, namely the Louisiana Irises, into a 'model system' for investigating hybrid fitness and the role of genetic exchange in adaptive evolution and diversification. In particular, we will argue that a multitude of approaches, involving both experimental and natural environments, and incorporating both manipulative analyses and surveys of natural populations, are necessary to adequately test for the evolutionary significance of introgressive hybridization. An appreciation of the variability of hybrid fitness leads to the conclusion that certain genetic signatures reflect adaptive evolution. Furthermore, tests of the frequency of allopatric versus sympatric/parapatric divergence (that is, divergence with ongoing gene flow) support hybrid genotypes as a mechanism of evolutionary diversification in numerous species complexes.

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An Evaluation of Narrow Hybrid Zones in Vertebrates

Cited by 604 publications

References 46 publications

Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai‘i Island

Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai‘i Island

Developmental stability, heterozygosity, and fitness in two introduced fire ants (Solenopsis invicta and S. richteri) and their hybrid

Hybrid fitness, adaptation and evolutionary diversification: lessons learned from Louisiana Irises

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