Is the Antarctic<i>Ophryotrocha orensanzi</i>(Annelida: Dorvilleidae) a circumpolar non-specialized opportunist?

Paxton, Hannelore; Wiklund, Helena; Alexander, F.R.E.S. Charles P.; Taboada, Sergi

doi:10.1080/14772000.2016.1218371

Cited by 7 publications

(14 citation statements)

References 27 publications

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“…Our results suggest that the three morphospeices, Laonice weddellia, Harmothoe fuligineum, and Aricidea simplex, are widespread within the West Antarctic, with potentially circumAntarctic distributions. Similar results were also found for the Dorvilleidae polychaete Ophryotrocha orensanzi by comparing COI data from west and east Antarctic populations (Paxton et al, 2016). Eight of the cryptic species sequenced in this study appear to be widespread occurring in multiple regions within the West Antarctic.…”

Section: Widespread Antarctic Speciessupporting

confidence: 71%

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

et al. 2017

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Recent genetic investigations have uncovered a high proportion of cryptic species within Antarctic polychaetes. It is likely that these evolved in isolation during periods of glaciation, and it is possible that cryptic populations would have remained geographically restricted from one another occupying different regions of Antarctica. By analysing the distributions of nine morphospecies, (six of which contained potential cryptic species), we find evidence for widespread distributions within the West Antarctic. Around 60% of the cryptic species exhibited sympatric distributions, and at least one cryptic clade was found to be widespread. Additional DNA barcodes from GenBank and morphological records extended the observed range of three species studied here, and indicate potential circum-Antarctic traits. Particle tracking analyses were used to model theoretical dispersal ranges of pelagic larvae. Data from these models suggest that the observed species distributions inferred from genetic similarity could have been established and maintained through the regional oceanographic currents, including the Antarctic Circumpolar Current (ACC) and its coastal counter current. Improved understanding of the distribution of Antarctic fauna is essential for predicting the impacts of environmental change and determining management strategies for the region.

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Section: Widespread Antarctic Speciessupporting

confidence: 71%

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

et al. 2017

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“…We have identified these as the P-type maxillary apparatus of the polychaete worm Ophryotrocha. Of all the Southern Ocean species of Ophryotrocha, O. orensanzi possesses maxillary pieces within its P-type mandibular apparatus that have a very prominent distal tooth similar to the specimens found in Hole U1357B (Taboada et al, 2013;Paxton et al, 2017). This distal tooth is especially prominent on the forceps of the maxillary apparatus and is formally described as a "lateral fang" on the P-type forceps in the emended diagnosis of O. orensanzi by Paxton et al (2017).…”

Section: Eggs Spermatophores Teeth and Other Animal Remainsmentioning

confidence: 84%

“…Biological taxon: We believe these are the remains of Ophryotrocha orensanzi. It could be, however, that these maxillary apparatuses belong to Ophryotrocha claparedii, for which the jaw apparatus is poorly known (Szaniawski and Wrona, 1987), or to an unknown species of Ophryotrocha, considering that the fauna around the Antarctic coast is poorly explored and the amount of new Ophryotrocha species that have been discovered away from the Antarctic coast has increased enormously in recent years (Paxton and Åkesson, 2007;Paxton and Davey, 2010;Taboada et al, 2013;Ravara et al, 2015;Paxton et al, 2017). Species of the dorvilleid Ophryotrocha possess a P-type maxillary apparatus when they are young or female (Paxton and Åkesson, 2007).…”

Section: Eggs Spermatophores Teeth and Other Animal Remainsmentioning

confidence: 99%

“…Species of the dorvilleid Ophryotrocha possess a P-type maxillary apparatus when they are young or female (Paxton and Åkesson, 2007). Once they become a sexually mature male or change from female to male (hermaphrodites) this P-type jaw gets replaced by a K-type jaw, which has greatly enlarged basal parts (forceps; Paxton and Åkesson, 2007;Paxton et al, 2017).…”

Section: Eggs Spermatophores Teeth and Other Animal Remainsmentioning

confidence: 99%

“…Recently discovered new species include Ophryotrocha orensanzi and Ophryotrocha clava discovered on experimentally deployed whale bones off the coast of Deception Island (Taboada et al, 2013) and Ophryotrocha shieldsi from underneath a fish farm in Tasmania (Paxton and Davey, 2010). Recently, O. orensanzi has also been reported from near Casey Station, East Antarctica (Paxton et al, 2017), which is not too far from Hole U1357B.…”

Section: Eggs Spermatophores Teeth and Other Animal Remainsmentioning

confidence: 99%

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A review of the ecological affinities of marine organic microfossils from a Holocene record offshore of Adélie Land (East Antarctica)

Hartman

Bijl

Sangiorgi

2018

J. Micropalaeontol.

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Abstract. Integrated Ocean Drilling Program (IODP) Expedition 318 recovered a ∼ 170 m long Holocene organic-rich sedimentary sequence at Site U1357. Located within the narrow but deep Adélie Basin close to the Antarctic margin, the site accumulated sediments at exceptionally high sedimentation rates, which resulted in extraordinary preservation of the organic sedimentary component. Here, we present an overview of 74 different mainly marine microfossil taxa and/or types found within the organic component of the sediment, which include the remains of unicellular and higher organisms from three eukaryotic kingdoms (Chromista, Plantae, and Animalia). These remains include phytoplanktonic (phototrophic dinoflagellates and prasinophytes) and very diverse zooplanktonic (heterotrophic dinoflagellates, tintinnids, copepods) organisms. We illustrate each marine microfossil taxon or type identified by providing morphological details and photographic images, which will help with their identification in future studies. We also review their ecological preferences to aid future (palaeo)ecological and (palaeo)environmental studies. The planktonic assemblage shows a high degree of endemism related to the strong influence of the sea-ice system over Site U1357. In addition, we found the remains of various species of detritus feeders and bottom-dwelling scavengers (benthic foraminifers and annelid worms) indicative of high export productivity at Site U1357. This study shows the potential of organic microfossil remains for reconstructing past environmental conditions, such as sea-ice cover and (export) productivity.

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Slope-shelf faunal link and unreported diversity off Nova Scotia: Evidence from polychaete data

Neal

Taboada

Woodall

2018

Deep Sea Research Part I: Oceanographic Research Papers

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Is the AntarcticOphryotrocha orensanzi(Annelida: Dorvilleidae) a circumpolar non-specialized opportunist?

Cited by 7 publications

References 27 publications

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

A review of the ecological affinities of marine organic microfossils from a Holocene record offshore of Adélie Land (East Antarctica)

Slope-shelf faunal link and unreported diversity off Nova Scotia: Evidence from polychaete data

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