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5 results for “Favia”
Data for: Genetic structuring and species boundaries in the Atlantic stony coral Favia (Scleractinia, Faviidae)
<p class="MsoNormal">Scleractinian corals are the main modern builders of coral reefs, dynamic ecosystems that are hot spots of marine biodiversity. Southern Atlantic reef corals are understudied compared to their Caribbean and Indo-Pacific counterparts and many hypotheses about their population dynamics demand further testing. We employed thousands of single nucleotide polymorphisms (SNPs) recovered via ezRAD to characterize genetic population structuring and species boundaries in the amphi-Atlantic hard coral genus <em>Favia</em>. Coalescent-based species delimitation (BFD* - Bayes factor delimitation) recovered <em>F. fragum </em>and <em>F. gravida </em>as separate species. Although our results agree with depth-related genetic structuring in <em>F.</em><em> frag</em><em>um</em><em>,</em><em> </em>they did not support incipient speciation of the "tall" and "short" morphotypes. The preferred scenario revealed a split between two main lineages of <em>F. gravida</em>, one from Ascension Island and the other from Brazil. The Brazilian lineage is further divided into a species that occurs throughout the Northeastern coast and another that ranges from the Abrolhos Archipelago to the state of Espírito Santo. BFD* scenarios were supported by analysis of datasets with varying levels of missing data. Our results challenge current notions about Atlantic reef corals because they uncovered surprising genetic diversity in <em>Favia</em><em> </em>and<em> </em>rejected the long-standing hypothesis that Abrolhos Archipelago may have served as a Pleistocenic refuge during the last glaciations. </p>
Data for: Genetic structuring and species boundaries in the Atlantic stony coral Favia (Scleractinia, Faviidae)
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Data from: The quantitative genetics of incipient speciation: heritability and genetic correlations of skeletal traits in populations of diverging Favia fragum ecomorphs.
Recent speciation events provide potential opportunities to understand the microevolution of reproductive isolation. We used a marker-based approach and a common garden to estimate the additive genetic variation in skeletal traits in a system of two ecomorphs within the coral species Favia fragum: a Tall ecomorph that is a seagrass specialist, and a Short ecomorph that is most abundant on coral reefs. Considering both ecomorphs, we found significant narrow-sense heritability (h²) in a suite of measurements that define corallite architecture, and could partition additive and non-additive variation for some traits. We found positive genetic correlations for homologous height and length measurements among different types of vertical plates (costosepta) within corallites, but negative correlations between height and length within, as well as between costosepta. Within ecomorphs, h² estimates were generally lower, compared to the combined ecomorph analysis. Marker-based estimates of h² were comparable to broad-sense heritability (H) obtained from parent-offspring regressions in a common garden for most traits, and similar genetic co-variance matrices for common garden and wild populations may indicate relatively small G × E interactions. The patterns of additive genetic variation in this system invite hypotheses of divergent selection or genetic drift as potential evolutionary drivers of reproductive isolation.
FIGURE 26. Favia speciosa, a in Some scleractinian corals (Scleractinia: Anthozoa) of Larak Island, Persian Gulf
FIGURE 26. Favia speciosa, a, exoskeleton; b, close up of corallites; c, underwater photograph of the colony; d, underwater photograph of polyps.
Data from: The quantitative genetics of incipient speciation: heritability and genetic correlations of skeletal traits in populations of diverging Favia fragum ecomorphs.
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