Evolutionary dynamics of a common sub-Antarctic octocoral family

Taylor, Michelle L.; Rogers, Alex D.

doi:10.1016/j.ympev.2014.11.008

Cited by 22 publications

(37 citation statements)

References 98 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, Astarte has an Early Mesozoic record elsewhere, and Thracia can be traced back to the Late Palaeozoic (Crame et al., ). Certain other major groups, such as the asellote isopods, hexactinellid sponges, pycnogonids and gorgonian octocorals, may have either Early Mesozoic or Late Palaeozoic origins (Gili et al., ; Lins, Ho, Wilson, & Lo, ; Taylor & Rogers, ; Wilson, ). However, the problem with these and many other Antarctic marine taxa is that they have very imperfect fossil records.…”

Section: An Outline Of the Key Stagesmentioning

confidence: 99%

Key stages in the evolution of the Antarctic marine fauna

Crame

2018

Journal of Biogeography

View full text Add to dashboard Cite

We are beginning to appreciate that the origin of the modern Antarctic marine fauna is related to a series of key events throughout the Cenozoic era. In the first of these, the mass extinction at the Cretaceous–Palaeogene boundary (66 Ma) reset the evolutionary stage and led to a major radiation of modern taxa in the benthic realm. Although this took place in a greenhouse world, there is evidence to suggest that the radiation was tempered by the seasonality of primary productivity, and this may be a time‐invariant feature of the polar regions. Although there could well have been a single, abrupt extinction event at c. 34 Ma, there is also evidence to suggest a phased extinction of various taxa over a period of millions of years. Important new molecular phylogenetic data are indicating that a wide variety of both benthic and pelagic taxa radiated shortly after a second major phase of cooling at c. 14 Ma. Such a phenomenon is linked to a series of major palaeoceanographic changes, which in turn led to a proliferation of diatom‐based ecosystems. Although the modern benthic marine fauna can be traced back some 45–50 Myr, a substantial component of the modern pelagic one may be less than 14 Myr old. The latter is also characterized by assemblages of high abundance but comparatively low species richness and evenness. A distinctive signature of low diversity but high dominance within Antarctic marine assemblages was maintained by the interplay between temperature and primary productivity throughout the Cenozoic.

show abstract

Section: An Outline Of the Key Stagesmentioning

confidence: 99%

Key stages in the evolution of the Antarctic marine fauna

Crame

2018

Journal of Biogeography

View full text Add to dashboard Cite

show abstract

“…Keys to the five western Atlantic species were published by Cairns and Bayer (2002) and Bayer et al (2014). Altogether, there are currently 28 valid species in the genus (Cairns and Bayer 2009; Taylor and Rogers 2015). …”

Section: Systematic Accountmentioning

confidence: 99%

Deep-Water Octocorals (Cnidaria, Anthozoa) from the Galápagos and Cocos Islands. Part 1: Suborder Calcaxonia

Cairns¹

2018

View full text Add to dashboard Cite

Thirteen species of deep-water calcaxonian octocorals belonging to the families Primnoidae, Chrysogorgiidae, and Isididae collected from off the Galápagos and Cocos Islands are described and figured. Seven of these species are described as new; nine of the 13 are not known outside the Galápagos region. Of the four species occurring elsewhere, two also occur in the eastern Pacific, one off Hawaii, and one from off Antarctica. A key to the 22 Indo-Pacific species of Callogorgia is provided to help distinguish those species.

show abstract

“…Thus, individuals were identified using a barcode approach. The molecular data set for Thouarella consisted of 756 bp fragment of the mtMutS for 109 specimens, including 27 from GenBank (McFadden, Alderslade, et al, ; McFadden et al, ; Taylor & Rogers, ). The data set included 116 (15%) sites that were variable and 103 (13.6%) that were parsimony informative.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, Thouarella species delimitation has been considered problematic and many species are in need of revision (Zapata‐Guardiola & López‐González, ). Furthermore, a recent study recovered Thouarella as a polyphyletic group (Taylor & Rogers, ). Molecular data generated here, for example recovered specimens previously identified as T. variabilis , T. crenelata and T. antarctica in multiple regions on the tree (Figure b), suggesting that current understanding of morphology does not align with genetics.…”

Section: Discussionmentioning

confidence: 99%

Unrecognized diversity of a scale worm, Polyeunoa laevis (Annelida: Polynoidae), that feeds on soft coral

et al. 2019

View full text Add to dashboard Cite

A goal of taxonomy is to employ a method of classification based on phylogeny that captures the morphological and genetic diversity of organismal lineages. However, morphological and genetic diversity may not always be concordant, leading to challenges in systematics. The scale worm Polyeunoa laevis has been hypothesized to represent a species complex based on morphology, although there is little knowledge of its genetic diversity. Commonly found in Antarctic waters and usually associated with gorgonian corals (especially Thouarella), this taxon is also reported from the south‐west Atlantic, Magellanic and sub‐Antarctic regions. We employ an integrative taxonomic approach to examine the traditional morphological characters used for scale worm identification in combination with COI mitochondrial gene data and whole mtDNA genomes. Moreover, we consider P. laevis's association with Thouarella by examining data from the mMutS gene, a soft‐coral phylogenetic marker. Analyses for P. laevis recovered 3 clades, two in Antarctic waters and one from the Argentina‐Indian Ocean. Interestingly, genetic and morphological results show differences between specimens from South Argentina and the Antarctic region, suggesting that open ocean barriers might have limited gene flow from these regions. Bayesian phylogenetic analyses for Thouarella resulted in at least 12 lineages, although some of the lineages consist of only a single individual. Our results show different evolutionary histories for both species, confirming that association between these scale worms and their hosts is not restrictive. For both taxonomic groups, biodiversity in the Southern Ocean appears to be underestimated.

show abstract

Evolutionary dynamics of a common sub-Antarctic octocoral family

Cited by 22 publications

References 98 publications

Key stages in the evolution of the Antarctic marine fauna

Key stages in the evolution of the Antarctic marine fauna

Deep-Water Octocorals (Cnidaria, Anthozoa) from the Galápagos and Cocos Islands. Part 1: Suborder Calcaxonia

Unrecognized diversity of a scale worm, Polyeunoa laevis (Annelida: Polynoidae), that feeds on soft coral

Contact Info

Product

Resources

About