Brittle stars from Southern Ocean (Echinodermata: Ophiuroidea)

Martín-Ledo, Rafael; López–González, Pablo J.

doi:10.1007/s00300-013-1411-8

Cited by 13 publications

(7 citation statements)

References 53 publications

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“…Brittle stars are important members of SO biodiversity, comprising at least 219 nominal species and 126 that are endemic from the region (Martín-Ledo & López-González, 2014). Three of these species belong to Ophionotus (O. hexactis (Smith 1876), O. taylori McKnight, 1967;and O. victoriae Bell 1902); all of which also occur in the SO but are morphologically distinct from each other.…”

Section: Introductionmentioning

confidence: 99%

Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single‐nucleotide polymorphism data

Galaska

Sands

Santos

et al. 2016

Ecology and Evolution

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Marine systems have traditionally been thought of as “open” with few barriers to gene flow. In particular, many marine organisms in the Southern Ocean purportedly possess circumpolar distributions that have rarely been well verified. Here, we use the highly abundant and endemic Southern Ocean brittle star Ophionotus victoriae to examine genetic structure and determine whether barriers to gene flow have existed around the Antarctic continent. Ophionotus victoriae possesses feeding planktotrophic larvae with presumed high dispersal capability, but a previous study revealed genetic structure along the Antarctic Peninsula. To test the extent of genetic differentiation within O. victoriae, we sampled from the Ross Sea through the eastern Weddell Sea. Whereas two mitochondrial DNA markers (16S rDNA and COI) were employed to allow comparison to earlier work, a 2b‐RAD single‐nucleotide polymorphism (SNP) approach allowed sampling of loci across the genome. Mitochondrial data from 414 individuals suggested three major lineages, but 2b‐RAD data generated 1,999 biallelic loci that identified four geographically distinct groups from 89 samples. Given the greater resolution by SNP data, O. victoriae can be divided into geographically distinct populations likely representing multiple species. Specific historical scenarios that explain current population structure were examined with approximate Bayesian computation (ABC) analyses. Although the Bransfield Strait region shows high diversity possibly due to mixing, our results suggest that within the recent past, dispersal processes due to strong currents such as the Antarctic Circumpolar Current have not overcome genetic subdivision presumably due to historical isolation, questioning the idea of large open circumpolar populations in the Southern Ocean.

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Section: Introductionmentioning

confidence: 99%

Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single‐nucleotide polymorphism data

Galaska

Sands

Santos

et al. 2016

Ecology and Evolution

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“…Studies and inventories on Antarctic echinoderms have shown this group as one of the most diverse in the shallow and deep seabed communities in this region Stöhr et al, 2012;Eléaume et al, 2014;Martín-Ledo and López-González, 2014;Fabri-Ruiz et al, 2017;Moreau et al, 2018). In the case of sea cucumbers, O' Loughlin et al (2010) proposed the Antarctic region as a biodiversity "hotspot" for the class Holothuroidea, presenting numbers that are equivalent to 4 % of the marine diversity documented in Antarctica and 10 % of the diversity of Holothuroidea in the world.…”

Section: Discussionmentioning

confidence: 98%

Volume 50, Número Especial

2021

Bol. Investig. Mar. Costeras

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“…Studies and inventories on Antarctic echinoderms have shown this group as one of the most diverse in the shallow and deep seabed communities in this region Stöhr et al, 2012;Eléaume et al, 2014;Martín-Ledo and López-González, 2014;Fabri-Ruiz et al, 2017;Moreau et al, 2018). In the case of sea cucumbers, proposed the Antarctic region as a biodiversity "hotspot" for the class Holothuroidea, presenting numbers that are equivalent to 4 % of the marine diversity documented in Antarctica and 10 % of the diversity of Holothuroidea in the world.…”

Section: Discussionmentioning

confidence: 98%

Annotated and illustrated list of echinoderms collected during the Colombian scientific expeditions to the Antarctica (2016-2019)

Borrero-Pérez

Yepes-Gaurisas

2021

Bol. Investig. Mar. Costeras

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I n order to contribute to the base line of knowledge that is being built of the Gerlache Strait and the adjacent areas, the echinoderms collected during the Scientific Expeditions from Colombia to Antarctica carried out between 2016 and 2019 as part of the project “Biodiversity and oceanographic conditions of the Gerlache Strait, Biogerlache-Antártica” are presented. Eleven stations between 54 and 523 m deep were sampled, using sediment dredgers that captured incidentally some individuals from the mega and macro-epifauna, which were separated, reviewed and identified. Twentynine (29) individuals were obtained in five of the sampled stations, belonging to 13 morphotypes. Ophiuroidea was the richest class (five morphotypes), followed by Holothuroidea (four), Asteroidea (two) and Crinoidea (two). Morphological and distribution comments are presented, as well as general and detailed images of each morphotype. Among the contributions to the inventory of echinoderms in the area, it is highlighted the sea cucumber genus Taeniogyrus Semper, 1867 that is registered for the first time for the Antarctic peninsula and the crinoid species Anthometrina adriani (Bell, 1908) that extends its geographical distribution, confined to the high-Antarctic shelf, up to the Gerlache Strait ( 64° 39 ‘S).

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Brittle stars from Southern Ocean (Echinodermata: Ophiuroidea)

Cited by 13 publications

References 53 publications

Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single‐nucleotide polymorphism data

Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single‐nucleotide polymorphism data

Volume 50, Número Especial

Annotated and illustrated list of echinoderms collected during the Colombian scientific expeditions to the Antarctica (2016-2019)

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