Unrecognized Antarctic Biodiversity: A Case Study of the Genus Odontaster (Odontasteridae; Asteroidea)

Janosik, Alexis M.; Halanych, Kenneth M.

doi:10.1093/icb/icq119

Cited by 62 publications

(62 citation statements)

References 56 publications

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“…Before this submission, the class Enteropneusta was essentially unknown from most of the Antarctic region, yet on our expeditions, they were repeatedly observed in camera transects on the continental shelf in east and west Antarctica 8 . These results underscore how poorly the biodiversity of Antarctic shelf fauna is known 18 and that more effort is needed to understand this rapidly changing region. …”

Section: Discussionmentioning

confidence: 86%

Modern Antarctic acorn worms form tubes

et al. 2013

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Section: Discussionmentioning

confidence: 86%

Modern Antarctic acorn worms form tubes

et al. 2013

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“…Cryptic or unrecognized species (Janosik and Halanych, 2010) are commonly identified by mitochondrial DNA studies of benthic invertebrates (For Antarctic examples see Linse et al, 2007;Leese and Held, 2008;Krabbe et al, 2010;Arango et al, 2011;Havermans et al, 2011;Hemery et al, 2012). There is considerable debate as to whether or not biological species should be delimited based solely on mitochondrial DNA sequence data (DeSalle et al, 2005;Taylor and Harris, 2012;Zhang et al, 2013).…”

Section: Crypsismentioning

confidence: 99%

Against the flow: evidence of multiple recent invasions of warmer continental shelf waters by a Southern Ocean brittle star

et al. 2015

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The Southern Ocean is anomalously rich in benthos. This biodiversity is native, mostly endemic and perceived to be uniquely threatened from climate-and anthropogenically-mediated invasions. Major international scientific effort throughout the last decade has revealed more connectivity than expected between fauna north and south of the worlds strongest marine barrier-the Polar Front (the strongest jet of the Antarctic Circumpolar Current). To date though, no research has demonstrated any radiations of marine taxa out from the Southern Ocean, except at abyssal depths (where conditions differ much less). Our phylogeographic investigation including mitochondrial sequences of 135 specimens of one of the most ubiquitous and abundant clades at high southern latitudes, the ophiuroids (brittlestars), shows that one of them, Ophiura lymani, has gone against the flow. Remarkably our phylogenetic and coalescent analyses suggest that O. lymani has successfully invaded the South American shelf from Antarctica at least three times, in recent (Pleistocene) radiation. Many previous studies have demonstrated links within clades across the Polar Front this is the first in which northwards directional movement of a shelf-restricted species is the only convincing explanation. Rapid, recent, regional warming is likely to facilitate multiple range shift invasions into the Southern Ocean, whereas movement of cold adapted fauna (considered highly stenothermal) out of the Antarctic to warmer shelves has, until now, seemed highly unlikely.

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“…We conclude that the two OTUs therefore either represent a single species, which for unknown reasons is clearly differentiated, or that the two OTUs may be two species, which are genuinely cryptic rather than pseudo-cryptic (Janosik & Halanych, 2010). Although there may be good reasons to flag potentially new species to attract further attention (Wägele, 1994), we do not propose the formal erection of a new species here because it can currently only be reliably identified a posteriori by DNA sequencing.…”

Section: Deep-sea Serolidae 39mentioning

confidence: 86%

Molecular differentiation in sympatry despite morphological stasis: deep-sea <italic>Atlantoserolis</italic> Wägele, 1994 and <italic>Glabroserolis</italic> Menzies, 1962 from the south-west Atlantic (Crustacea: Isopoda: Serolidae)

2014

Zoological Journal of the Linnean Society

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During DIVA-3, the third expedition of the DIVA project (Latitudinal gradients of deep-sea biodiversity in the Atlantic Ocean), 45 specimens of Serolidae were obtained from the Argentine Basin, at a depth of about 4600 m. These were a new species of Glabroserolis and Atlantoserolis vemae (Menzies, 1962). Besides the description of Glabroserolis occidentalis sp. nov., Glabroserolis specialis Menzies, 1962 is redescribed on the basis of the type material. Atlantoserolis vemae is redescribed using the type material, North Atlantic specimens, and the new South Atlantic material. Morphological differences between specimens of A. vemae from the North and South Atlantic could not be identified. The molecular data suggest that A. vemae from the Argentine Basin comprises two deeply divergent clades, which may represent reproductively isolated, sympatric species.

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Unrecognized Antarctic Biodiversity: A Case Study of the Genus Odontaster (Odontasteridae; Asteroidea)

Cited by 62 publications

References 56 publications

Modern Antarctic acorn worms form tubes

Modern Antarctic acorn worms form tubes

Against the flow: evidence of multiple recent invasions of warmer continental shelf waters by a Southern Ocean brittle star

Molecular differentiation in sympatry despite morphological stasis: deep-sea <italic>Atlantoserolis</italic> Wägele, 1994 and <italic>Glabroserolis</italic> Menzies, 1962 from the south-west Atlantic (Crustacea: Isopoda: Serolidae)

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