Diet-driven ecological radiation and allopatric speciation result in high species diversity in a temperate-cold water marine genus Dendronotus (Gastropoda: Nudibranchia)

Ekimova, Irina; Valdés, Ángel; Chichvarkhin, Anton; Antokhina, Tatiana I.; Lindsay, Tabitha; Schepetov, Dimitry M.

doi:10.1016/j.ympev.2019.106609

Cited by 51 publications

(48 citation statements)

References 85 publications

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“…These RNA differences, located in the apical loop as depicted in Figure 4c, can be considered diagnostic nucleotides in separating the two taxa since are invariantly present in all sequences analysed, regardless of the geographic distance occurring among samples. The occurrence in sympatry of individuals carrying mitochondrial haplotypes from the two divergent haplogroups, without intermediate haplotypes, is suggestive of a secondary contact between these two groups that could have diverged in allopatry (Carmona et al., 2014; Ekimova et al., 2019). The level of phylogenetic divergence between F. cavolini and F. gaditana is not large, suggesting a recent origin of these species.…”

Section: Discussionmentioning

confidence: 99%

When morphology does not match phylogeny: The puzzling case of two sibling nudibranchs (Gastropoda)

Furfaro

Salvi

Trainito³

et al. 2021

Zoologica Scripta

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Species delimitation is particularly challenging in Mediterranean nudibranchs because morphological distinction between closely related species is subtle and several cryptic species have been discovered. In this study, we apply an integrative approach to investigate taxonomic distinction of Flabellina cavolini and F. gaditana and assess their genetic and morphologic distinction. We combined a comprehensive phylogeographic survey from across their distribution range and compared genetic variation at mitochondrial and nuclear markers with the variation in colour pattern of cerata that is used to discriminate these two species. Phylogenetic, phylogeographic and species delimitation analyses consistently identify two evolutionary and taxonomic units that do not match with the morphospecies, demonstrating that Flabellina cavolini and F. gaditana are indeed two cryptic, closely related, species and that colour pattern of cerata is not a valid diagnostic character. This study emphasizes how the comparison of range‐wide patterns of phylogenetic and morphological variation, with the inclusion of samples from the type localities, is essential for species delimitation of Mediterranean nudibranchs. Moreover, this study demonstrates the occurrence of Flabellina gaditana in the Mediterranean Sea, allowing to extend the known distribution range of the species, that was previously restricted to the eastern Atlantic Ocean, as well as increasing our inventory of Mediterranean nudibranch diversity.

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Section: Discussionmentioning

confidence: 99%

When morphology does not match phylogeny: The puzzling case of two sibling nudibranchs (Gastropoda)

Furfaro

Salvi

Trainito³

et al. 2021

Zoologica Scripta

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“…configuration. Examples of these ecosystems, such as bacterial assemblages evolving dependencies through mutual adaptation(Morris et al 2011;Harvey et al 2014), ecosystems recovering from invasions of foreign species(Chisholm 2010), or uninhabited regions colonized by a small number of species adaptively radiating through rapid allopatric and hybrid speciation(Lamichhaney et al 2018;Ekimova et al 2019), imply that this pattern of niche exploration and complementary adaptation away from initial conflict does generally play out in the long term.…”

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confidence: 99%

Cooperative Equilibrium in Biosphere Evolution: Reconciling Competition and Cooperation in Evolutionary Ecology

Herring

2021

Acta Biotheor

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“…There is a growing body of evidence that ecological factors play an important role in in structuring the genetic diversity of marine populations and promoting speciation (Prada and Hellberg 2020; Taylor and Hellberg 2005; Whitney, Donahue, and Karl 2018; Momigliano et al 2017; Teske et al 2019; Holt et al 2020; Bird et al 2011; Choat et al 2012; Potkamp and Fransen 2019; Faria, Johannesson, and Stankowski 2021), and failure to replicate one study is not sufficient cause to question the growing consensus that ecological speciation and speciation with gene flow play an important role in generating marine biodiversity. Likewise, there is an abundance of evidence that allopatry has also promoted speciation in marine settings (Wainwright et al 2018; Ekimova et al 2019; Chenuil et al 2018; Holt et al 2020; Laakkonen et al 2021). We should not be surprised that in such a species-rich and unique environment there is evidence for a variety of speciation mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Reevaluating claims of ecological speciation inHalichoeres bivittatus

Warren

Eytan

Dornburg

et al. 2021

Preprint

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Understanding the role of ecological processes in speciation has become one of the most active areas of research in marine population biology in recent decades. The traditional view was that allopatry was the primary driver of speciation in marine taxa, but the geography of the marine environment and the dispersal capabilities of many marine organisms render this view somewhat questionable. One of the earliest and most highly cited empirical examples of ecological speciation with gene flow in marine fishes is that of the slippery dick wrasse, Halichoeres bivittatus. Evidence for this cryptic or incipient speciation event was primarily in the form of a deep north-south divergence in a single mitochondrial locus, combined with a finding that these two haplotypes were associated with different habitat types in the Florida Keys and Bermuda, where they overlap. Here we examine habitat assortment in the Florida Keys using a broader sampling of populations and habitat types than were available for the original study, and find no evidence to support the claim that haplotype frequencies differ between habitat types, and little evidence to support any differences between populations. These results severely undermine claims of ecological speciation with gene flow in Halichoeres bivittatus. We argue that future claims of this type should be supported by multiple lines of evidence that illuminate potential mechanisms and allow researchers to rule out alternative explanations for spatial patterns of genetic differences.

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Diet-driven ecological radiation and allopatric speciation result in high species diversity in a temperate-cold water marine genus Dendronotus (Gastropoda: Nudibranchia)

Cited by 51 publications

References 85 publications

When morphology does not match phylogeny: The puzzling case of two sibling nudibranchs (Gastropoda)

When morphology does not match phylogeny: The puzzling case of two sibling nudibranchs (Gastropoda)

Cooperative Equilibrium in Biosphere Evolution: Reconciling Competition and Cooperation in Evolutionary Ecology

Reevaluating claims of ecological speciation inHalichoeres bivittatus

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