Hybridization and the Evolution of Reef Coral Diversity

Vollmer, Steven V.; Palumbi, Stephen R.

doi:10.1126/science.1069524

Cited by 255 publications

(286 citation statements)

References 20 publications

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“…Questions remain concerning why mtDNA haplotypes did not introgress with nuclear alleles (perhaps gene flow is male-mediated) and the current taxonomic status of Mexican flies. Nevertheless, our results evoke a surprising ''PostModern'' synthesis of processes and personalities, adding to a growing literature (35)(36)(37)(38) implying that the origins of animal species can be as dynamic and rich (reticulate) as those for plants.…”

Section: Discussionmentioning

confidence: 86%

Allopatric genetic origins for sympatric host-plant shifts and race formation in Rhagoletis

Feder

Berlocher

Roethele

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

315

365

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Tephritid fruit flies belonging to the Rhagoletis pomonella sibling species complex are controversial because they have been proposed to diverge in sympatry (in the absence of geographic isolation) by shifting and adapting to new host plants. Here, we report evidence suggesting a surprising source of genetic variation contributing to sympatric host shifts for these flies. From DNA sequence data for three nuclear loci and mtDNA, we infer that an ancestral, hawthorn-infesting R. pomonella population became geographically subdivided into Mexican and North American isolates Ϸ1.57 million years ago. Episodes of gene flow from Mexico subsequently infused the North American population with inversion polymorphism affecting key diapause traits, forming adaptive clines. Sometime later (perhaps ؎1 million years), diapause variation in the latitudinal clines appears to have aided North American flies in adapting to a variety of plants with differing fruiting times, helping to spawn several new taxa. Thus, important raw genetic material facilitating the adaptive radiation of R. pomonella originated in a different time and place than the proximate ecological host shifts triggering sympatric divergence.

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Section: Discussionmentioning

confidence: 86%

Allopatric genetic origins for sympatric host-plant shifts and race formation in Rhagoletis

Feder

Berlocher

Roethele

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

315

365

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“…Secondary contact among recently diverged taxa, along with a host of other factors (e.g. external fertilization, weak behavioral isolation, niche overlap and unequal abundance of parental species) facilitate potential interspecific mating (Gardner, 1997;Volmer and Palumbi, 2002;. There are several possible outcomes when two species interbreed.…”

Section: Introductionmentioning

confidence: 99%

Surgeons and suture zones: Hybridization among four surgeonfish species in the Indo-Pacific with variable evolutionary outcomes

DiBattista

Whitney

Craig

et al. 2016

Molecular Phylogenetics and Evolution

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Surgeons and suture zones: Hybridization among four surgeonfish species in the Indo-Pacific with variable evolutionary outcomes, Molecular Phylogenetics and Evolution (2016), doi: http:// dx.doi.org/10. 1016/j.ympev.2016.04.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. . japonicus and A. nigricans) are distinguishable only at a population or subspecies level (Φ ST = 0.6533, P < 0.001). Little population structure was observed within species, with evidence of recent population expansion across all four geographic ranges. We detected sharing of mtDNA haplotypes between species and extensive hybridization based on microsatellites, consistent with later generation hybrids but also the effects of allele homoplasy. Despite extensive introgression, 98% of specimens had 3 concordance between mtDNA lineage and species identification based on external morphology, indicating that species integrity may not be eroding. The A. nigricans complex demonstrates a range of outcomes from incomplete speciation to secondary contact to decreasing hybridization with increasing evolutionary depth.

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“…In the case of the three Caribbean acroporids, recent genetic studies suggest that Acropora prolifera is an F 1 hybrid of A. palmata and A. cervicornis (van Oppen et al 2000;Vollmer and Palumbi 2002), with little evidence for extensive introgression between A. cervicornis and A. palmata (Vollmer and Palumbi 2002). Most reproductive studies in the western Atlantic have focused on the Montastraea annularis species complex (van Veghel 1994;Knowlton et al 1997;Szmant et al 1997;Hagman et al 1998a,b;Sanchez et al 1999), whose members are among the most important reef builders of the region.…”

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confidence: 99%

Mechanisms of Reproductive Isolation Among Sympatric Broadcast-Spawning Corals of the Montastraea Annularis Species Complex

et al. 2004

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Abstract. Many coral species spawn simultaneously and have compatible gametes, leading to controversy over the nature of species boundaries and the frequency with which hybridization occurs. Three western Atlantic corals, Montastraea annularis, M. faveolata, and M. franksi, typify this controversy; they all spawn sympatrically on the same evenings after the fall full moons. Here we show, in both Panama and the Bahamas for multiple years, how a variety of mechanisms may act in concert to reproductively isolate all three species. Field studies indicate that M. franksi spawns two hours earlier than the other two species, and the eggs released during this earlier period disperse an average of 500 m by the time the other species spawn. Field measures of fertilization indicate that peak fertilization occurs when spawning synchrony is high and that corals that spawn at the tails of the spawning distributions have greatly reduced fertilization success. Laboratory studies indicate that there is a gametic incompatibility between M. faveolata and the other two species. There are regional differences in the gametic compatibility of M. franksi and M. annularis. In Panama, the two species are completely compatible, whereas in the Bahamas, M. franksi sperm can fertilize M. annularis eggs but the reciprocal cross often fails. Gamete age influences patterns of fertilization, such that very young eggs seem resistant to fertilization and old sperm lose viability after two hours. In sum, the combination of temporal differences in spawning, sperm aging, gamete dispersal and dilution, and gametic incompatibility act in various combinations among the three species, making it unlikely that hybrid fertilization would occur.

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Hybridization and the Evolution of Reef Coral Diversity

Cited by 255 publications

References 20 publications

Allopatric genetic origins for sympatric host-plant shifts and race formation in Rhagoletis

Allopatric genetic origins for sympatric host-plant shifts and race formation in Rhagoletis

Surgeons and suture zones: Hybridization among four surgeonfish species in the Indo-Pacific with variable evolutionary outcomes

Mechanisms of Reproductive Isolation Among Sympatric Broadcast-Spawning Corals of the Montastraea Annularis Species Complex

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