Switch between Morphospecies of <i>Pocillopora</i> Corals

Paz‐García, David A.; Hellberg, Michael E.; León, Francisco J. Garcı́a de; Balart, Eduardo F.

doi:10.1086/682363

Cited by 64 publications

(48 citation statements)

References 26 publications

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“…Previous genetic data show that (1) morphospecies identification is an inconsistent predictor of genetic affinities within Porites (Forsman et al ., ), as is the case for many coral morphospecies (Eytan et al ., ; Stefani et al ., ; Prada et al ., ; Paz‐García et al ., ), and (2) eastern Pacific populations of P. lobata are genetically isolated from other regions of the tropical Pacific (Baums et al ., ). Genetic data from these studies (mtDNA and ITS in Forsman et al ., ; microsatellites in Boulay et al ., ) also reveal that colonies morphologically diagnosed as P. lobata include a cryptic species ( P. evermanni ).…”

Section: Discussionmentioning

confidence: 99%

Getting a grip at the edge: recolonization and introgression in eastern PacificPoritescorals

Hellberg

Prada

Tan

et al. 2016

Journal of Biogeography

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Aim To infer species identity, population isolation, and geographical variation in inter‐specific hybridization among corals of the genus Porites from the central and eastern tropical Pacific, with a focus on the timing of separation between populations of P. evermanni and P. lobata divided by the Eastern Pacific Barrier. Location Hawaii, American Samoa, Panama and the Galapagos Islands of Ecuador. Methods Maximum likelihood gene trees were obtained for mitochondrial DNA (COI), the internal transcribed spacer (ITS), and 5 single‐copy nuclear (scn) gene regions. Allelic networks were used to group multi‐locus scn data into species clusters despite some allele sharing. Coalescent analyses (IMa2) of the 5 scn markers were used to estimate the time of population divergence and test for introgression between P. evermanni and P. lobata. Results Allelic networks based on scn gene sequences agreed with mtCOI and ITS designations. Divergence times between Hawaiian and eastern Pacific populations are consistent with an early Pleistocene recolonization of the eastern Pacific by P. evermanni followed by a more recent arrival of P. lobata. The two species were fully isolated in Hawaii/American Samoa populations, but introgression from P. evermanni into P. lobata was evident in the eastern Pacific. Main conclusions These results are consistent with a scenario where a bout of introgression with P. evermanni, an early‐arriving colonizer of the eastern Pacific suited to marginal environmental conditions, facilitated the later colonization of the more sensitive P. lobata.

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Section: Discussionmentioning

confidence: 99%

Getting a grip at the edge: recolonization and introgression in eastern PacificPoritescorals

Hellberg

Prada

Tan

et al. 2016

Journal of Biogeography

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“…Similarly, cryptic species of A. lottini are likely, based on correlated genetic and color pattern differences2122 and male-female pairing on corals, but because the clades have not been formally described, they are not routinely distinguished in ecological studies81123. The most challenging are the coral hosts themselves, because of widespread phenotypic plasticity in response to environmental conditions24, the slow evolution of mitochondrial DNA (e.g 2526 in corals generally.…”

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confidence: 99%

Molecular characterization reveals the complexity of previously overlooked coral-exosymbiont interactions and the implications for coral-guild ecology

Rouzé

Leray

Magalon

et al. 2017

Sci Rep

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Several obligate associate crabs and shrimps species may co-occur and interact within a single coral host, leading to patterns of associations that can provide essential ecological services. However, knowledge of the dynamics of interactions in this system is limited, partly because identifying species involved in the network remains challenging. In this study, we assessed the diversity of the decapods involved in exosymbiotic assemblages for juvenile and adult Pocillopora damicornis types α and β on reefs of New Caledonia and Reunion Island. This approach revealed complex patterns of association at regional and local scales with a prevalence of assemblages involving crab-shrimp partnerships. Furthermore, the distinction of two lineages in the snapping shrimp Alpheus lottini complex, rarely recognized in ecological studies, reveals a key role for cryptic diversity in structuring communities of mutualists. The existence of partnerships between species that occurred more commonly than expected by chance suggests an increased advantage for the host or a better adaptation of associated species to local environmental conditions. The consideration of cryptic diversity helps to accurately describe the complexity of interaction webs for diverse systems such as coral reefs, as well as the functional roles of dominant associated species for the persistence of coral populations.

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“…Incongruence between morphological and molecular evidence for species boundaries is common in corals (e.g., Forsman et al, 2009, 2010; Keshavmurthy et al, 2013). Contributing factors include environmental plasticity (e.g., Paz-García et al, 2015) and frequent homoplasy of morphological characters (e.g., Forsman et al, 2009) as well as the slow rate of mitochondrial gene evolution that has made ‘universal’ molecular barcodes such as COI relatively invariant among congeneric species (Huang et al, 2008; McFadden et al, 2011; Shearer & Coffroth, 2008). When barcodes fail to discriminate distinct morphospecies it may be because the markers lack appropriate variation, or, alternatively, because morphological variation within a species has been incorrectly interpreted as evidence of a species boundary (McFadden et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

A next generation approach to species delimitation reveals the role of hybridization in a cryptic species complex of corals

Quattrini

Soong

et al. 2019

Preprint

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26Background: Our ability to investigate processes shaping the evolutionary diversification of 27 corals (Cnidaria: Anthozoa) is limited by a lack of understanding of species boundaries. 28 Discerning species has been challenging due to a multitude of factors, including homoplasious 29 and plastic morphological characters and the use of molecular markers that are either not 30 informative or have not completely sorted. Hybridization can also blur species boundaries by 31 leading to incongruence between morphology and genetics. We used traditional DNA barcoding 32 and restriction-site associated DNA sequencing combined with coalescence-based and allele-33 frequency methods to elucidate species boundaries and simultaneously examine the potential role 34 of hybridization in a speciose genus of octocoral, Sinularia. 35 Results: Species delimitations using two widely used DNA barcode markers, mtMutS and 28S 36 rDNA, were incongruent with one another and with the morphospecies identifications, likely due 37 to incomplete lineage sorting. In contrast, 12 of the 15 morphospecies examined formed well-38 supported monophyletic clades in both concatenated RAxML phylogenies and SNAPP species 39 trees of >6,000 RADSeq loci. DAPC and Structure analyses also supported morphospecies 40 assignments, but indicated the potential for two additional cryptic species. Three 41 morphologically distinct species pairs could not, however, be distinguished genetically. ABBA-42 BABA tests demonstrated significant admixture between some of those species, suggesting that 43 hybridization may confound species delimitation in Sinularia. 44 Conclusions: A genomic approach can help to guide species delimitation while simultaneously 45 elucidating the processes generating diversity in corals. Results support the hypothesis that 46 hybridization is an important mechanism in the evolution of Anthozoa, including octocorals, and 47 3 future research should examine the contribution of this mechanism in generating diversity across 48 the coral tree of life. 49 50

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Switch between Morphospecies of Pocillopora Corals

Cited by 64 publications

References 26 publications

Getting a grip at the edge: recolonization and introgression in eastern PacificPoritescorals

Getting a grip at the edge: recolonization and introgression in eastern PacificPoritescorals

Molecular characterization reveals the complexity of previously overlooked coral-exosymbiont interactions and the implications for coral-guild ecology

A next generation approach to species delimitation reveals the role of hybridization in a cryptic species complex of corals

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