Biogeographical and phylogeographical relationships of the bathyal ophiuroid fauna of the Macquarie Ridge, Southern Ocean

O’Hara, Timothy D.; Smith, Peter; Mills, Sadie; Смирнов, И. С.; Steinke, Dirk

doi:10.1007/s00300-012-1261-9

Cited by 15 publications

(21 citation statements)

References 38 publications

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“…The faunal affinities between East Antarctica and the Macquarie Island suggest that faunal connections may occur through the southern Macquarie ridge, as demonstrated for other echinoderms (asteroids and ophiuroids) (O'Hara, ; O'Hara et al ., ). An additional link was observed between Macquarie and the sub‐Antarctic islands, supporting a pattern already established for echinoderms (asteroids, ophiuroids and holothuroids: O'Hara, ).…”

Section: Discussionmentioning

confidence: 97%

Reproductive strategy as a piece of the biogeographic puzzle: a case study using Antarctic sea stars (Echinodermata, Asteroidea)

Moreau

Saucède

Jossart

et al. 2017

Journal of Biogeography

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Aim To describe and analyse asteroid biogeographic patterns in the Southern Ocean (SO) and test whether reproductive strategy (brooder versus broadcaster) can explain distribution patterns at the scale of the entire class. We hypothesize that brooding and broadcasting species display different biogeographic patterns.Location Southern Ocean, south of 45°S.Methods Over 14,000 asteroid occurrences are analysed using bootstrapped spanning network (BSN), non-metrical multidimensional scaling (nMDS) and clustering to uncover the spatial structure of faunal similarities among 25 bioregions.Results Main biogeographic patterns are congruent with previous works based on other taxa and highlight the isolation of New Zealand, the high richness in the Scotia Arc area particularly of brooding species, an East/West Antarctic differentiation, and the faunal affinities between South America and sub-Antarctic Islands. Asteroids show lower endemism levels than previously reported with 29% of species occurring in Antarctica only. In particular, asteroids from Tierra del Fuego showed affinities with those of West Antarctica at the species level, suggesting a recent mixing of assemblages. Biogeographic patterns are highly linked to reproductive strategy. Patterns also differ according to the taxonomic level, revealing the underlying role of historical factors.Main conclusions Patterns of sea star biogeography are consistent with results obtained for other marine groups and are strongly linked to reproductive strategy.

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Section: Discussionmentioning

confidence: 97%

Reproductive strategy as a piece of the biogeographic puzzle: a case study using Antarctic sea stars (Echinodermata, Asteroidea)

Moreau

Saucède

Jossart

et al. 2017

Journal of Biogeography

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“…The tracks of DTIS transects are shown as black lines potential of seamounts for stepping-stone dispersal is equivocal (Leal & Bouchet, 1991;McClain, 2007;O'Hara et al 2010;Christiansen et al, 2015) yet seamounts such as the Scott Seamount Chain, and those extending northwards from the Balleny Islands to the Macquarie Ridge offer Antarctic fauna a range of bathyal environments in the Southern Ocean. Dispersal between Antarctic and temperate waters may be intermittent (O'Hara et al, 2013) but such pathways may nevertheless be important as climate changes in future (Tittensor et al, 2010). Latitude, longitude, and depth were included as starting terms, with remaining variables added to the model by stepwise selection using the adjusted R 2 criterion.…”

Section: Discussionmentioning

confidence: 99%

Seamount biodiversity: high variability both within and between seamounts in the Ross Sea region of Antarctica

Clark

Bowden

2015

Hydrobiologia

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were sampled to examine variability in benthic faunal communities of seamounts. Multivariate analysis of video and still image data showed that benthic community composition was highly variable both within and between seamounts. The distribution patterns of benthic communities varied considerably, with very high densities of certain taxa in some places, sparse fauna in many others, and highly patchy distributions for others. Dissimilarities between seamounts were influenced by differences in population densities of taxa, the proportions of transects in which taxa were present, and by taxa being restricted to only one seamount or group of seamounts. Scott Island seamount was less similar to the others, despite the greater distances between Admiralty and Scott A and B seamounts. The observed variability in community composition was mainly associated with differences in depth, chlorophyll concentration, and seabed rugosity. Results support an earlier hypothesis that the location of seamounts relative to the Ross Sea gyre could be an important factor determining the composition and abundance of benthic invertebrate communities.

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“…When subsequent complementary evidence indicates that the primary character distinguishing species is inappropriate, reappraisal of the species definition using all available information-the integrative approach (Dayrat, 2005;Will et al, 2005)-is required. Patagonian Shelf (Falkland Islands/Malvinas) specimens have been sequenced using mtDNA CO1 sequence by , and as O. vivipara Clade B by O'Hara et al (2013O'Hara et al ( , 2014. Based on our analyses here any material currently identified as O. vivipara from the Antarctic continental shelf is likely to be O. pentactis, despite having more than five arms.…”

Section: Discussionmentioning

confidence: 99%

“…The authors noted that the difficulties in morphologically distinguishing between the two species were such that they were forced to recognize a pool of morphotypes. Previously, O'Hara et al (2013O'Hara et al ( , 2014 examined the phylogeographic patterns of selected ophiuroids across broad geographic scales. One taxon they focused on in both studies was O. vivipara, with collections available spanning the entire Southern Ocean as far north as the Patagonian shelf, New Zealand shelf and southern Australian shelf.…”

Section: Introductionmentioning

confidence: 99%

Pragmatic Assignment of Species Groups Based on Primary Species Hypotheses: The Case of a Dominant Component of the Southern Ocean Benthic Fauna

2021

Self Cite

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Ecological studies that enhance our understanding of the structure and function of the natural world rely heavily on accurate species identification. With rapid sample accumulation and declining taxonomic expertise, cladistics, phylogenetics and coalescent-based analyses have become key tools for identification or discrimination of species. These tools differ in effectiveness and interpretation depending on researcher perspective and the unique evolutionary histories of the taxa. Given the cost and time required for taxonomic assessment of ambiguous species groups, we advocate a pragmatic approach to clarify species assignment. We carried out a case-study on species from the diverse ophiuroid genus Ophiacantha common in shelf habitats around the Southern Ocean. Although several of the species are formally described with clear and distinctive morphological characters and reproductive strategies (O. vivipara, O. pentactis, O. densispina, O. antarctica, and O. wolfarntzi), recent molecular data has highlighted issues with these morphospecies, the characters that formally define them and their evolutionary histories. Here we provide evidence that key morphological features of species can be deceptive and show that six-armed O. vivipara, for example, is not a widely distributed Southern Ocean species as currently accepted, rather, three disparate clades. Ophiacantha pentactis, described as having five arms, frequently has six arms and the six-armed form is mistakenly classified as O. vivipara. All six-armed specimens collected from the Antarctic continental shelf fall into the O. pentactis species clade. Molecular tools designed for species delimitation appear to fail to reflect the “true” species composition. Rather than rely on a single tool for species recognition, we advocate an integrated approach using traditional detailed taxonomic morphology, summary statistics of molecular sequence data from populations, robust phylogenies, sufficient geographical sampling and local biological knowledge to ensure that species hypotheses can be built on mutually supporting lines of evidence.

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Biogeographical and phylogeographical relationships of the bathyal ophiuroid fauna of the Macquarie Ridge, Southern Ocean

Cited by 15 publications

References 38 publications

Reproductive strategy as a piece of the biogeographic puzzle: a case study using Antarctic sea stars (Echinodermata, Asteroidea)

Reproductive strategy as a piece of the biogeographic puzzle: a case study using Antarctic sea stars (Echinodermata, Asteroidea)

Seamount biodiversity: high variability both within and between seamounts in the Ross Sea region of Antarctica

Pragmatic Assignment of Species Groups Based on Primary Species Hypotheses: The Case of a Dominant Component of the Southern Ocean Benthic Fauna

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