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Featured researches published by Laura Würzberg.


PLOS ONE | 2010

Poles Apart: The “Bipolar” Pteropod Species Limacina helicina Is Genetically Distinct Between the Arctic and Antarctic Oceans

Brian P. V. Hunt; Jan M. Strugnell; Nina Bednaršek; Katrin Linse; R. John Nelson; E. A. Pakhomov; Brad A. Seibel; Dirk Steinke; Laura Würzberg

The shelled pteropod (sea butterfly) Limacina helicina is currently recognised as a species complex comprising two sub-species and at least five “forma”. However, at the species level it is considered to be bipolar, occurring in both the Arctic and Antarctic oceans. Due to its aragonite shell and polar distribution L. helicina is particularly vulnerable to ocean acidification. As a key indicator of the acidification process, and a major component of polar ecosystems, L. helicina has become a focus for acidification research. New observations that taxonomic groups may respond quite differently to acidification prompted us to reassess the taxonomic status of this important species. We found a 33.56% (±0.09) difference in cytochrome c oxidase subunit I (COI) gene sequences between L. helicina collected from the Arctic and Antarctic oceans. This degree of separation is sufficient for ordinal level taxonomic separation in other organisms and provides strong evidence for the Arctic and Antarctic populations of L. helicina differing at least at the species level. Recent research has highlighted substantial physiological differences between the poles for another supposedly bipolar pteropod species, Clione limacina. Given the large genetic divergence between Arctic and Antarctic L. helicina populations shown here, similarly large physiological differences may exist between the poles for the L. helicina species group. Therefore, in addition to indicating that L. helicina is in fact not bipolar, our study demonstrates the need for acidification research to take into account the possibility that the L. helicina species group may not respond in the same way to ocean acidification in Arctic and Antarctic ecosystems.


PLOS ONE | 2013

A vertical wall dominated by Acesta excavata and Neopycnodonte zibrowii, part of an undersampled group of deep-sea habitats.

Mark P. Johnson; Martin White; Annette M. Wilson; Laura Würzberg; Enrico Schwabe; Helka Folch; A. Louise Allcock

We describe a novel biotope at 633 to 762 m depth on a vertical wall in the Whittard Canyon, an extensive canyon system reaching from the shelf to the deep sea on Ireland’s continental margin. We explored this wall with an ROV and compiled a photomosaic of the habitat. The assemblage contributing to the biotope was dominated by large limid bivalves, Acesta excavata (mean shell height 10.4 cm), and deep-sea oysters, Neopycnodonte zibrowii, at high densities, particularly at overhangs. Mean density of N. zibrowii increased with depth, with densities of the most closely packed areas of A. excavata also increasing with depth. Other taxa associated with the assemblage included the solitary coral Desmophyllum dianthus, cerianthid anemones, comatulid crinoids, the trochid gastropod Margarites sp., the portunid crab Bathynectes longispina and small fish of the family Bythitidae. The scleractinian coral Madrepora oculata, the pencil urchin Cidaris cidaris and a species of Epizoanthus were also common. Prominent but less abundant species included the flytrap anemone Actinoscyphia saginata, the carrier crab Paramola cuvieri, and the fishes Lepidion eques and Conger conger. Observations of the hydrography of the canyon system identified that the upper 500 m was dominated by Eastern North Atlantic Water, with Mediterranean Outflow Water beneath it. The permanent thermocline is found between 600 and 1000 m depth, i.e., in the depth range of the vertical wall and the dense assemblage of filter feeders. Beam attenuation indicated nepheloid layers present in the canyon system with the greatest amounts of suspended material at the ROV dive site between 500 and 750 m. A cross-canyon CTD transect indicated the presence of internal waves between these depths. We hypothesise that internal waves concentrate suspended sediment at high concentrations at the foot of the vertical wall, possibly explaining the large size and high density of filter-feeding molluscs.


Deep-sea Research Part Ii-topical Studies in Oceanography | 2013

Epifauna of the Sea of Japan collected via a new epibenthic sledge equipped with camera and environmental sensor systems

A. Brandt; Nikolaus O. Elsner; Nils Brenke; Olga A. Golovan; Marina V. Malyutina; Torben Riehl; Enrico Schwabe; Laura Würzberg


Deep-sea Research Part Ii-topical Studies in Oceanography | 2011

Diet insights of deep-sea polychaetes derived from fatty acid analyses

Laura Würzberg; Janna Peters; Myriam Schüller; A. Brandt


Deep-sea Research Part Ii-topical Studies in Oceanography | 2011

Fatty acid patterns of Southern Ocean shelf and deep sea peracarid crustaceans and a possible food source, foraminiferans

Laura Würzberg; Janna Peters; A. Brandt


Elementa: Science of the Anthropocene | 2017

Major impacts of climate change on deep-sea benthic ecosystems

Andrew K. Sweetman; Andrew R. Thurber; Craig R. Smith; Lisa A. Levin; Camilo Mora; Chih-Lin Wei; Andrew J. Gooday; Daniel O.B. Jones; Michael A. Rex; Moriaki Yasuhara; Jeroen Ingels; Henry A. Ruhl; Christina A. Frieder; Roberto Danovaro; Laura Würzberg; Amy R. Baco; Benjamin M. Grupe; Alexis L. Pasulka; Kirstin S. Meyer; Katherine M. Dunlop; Lea-Anne Henry; J. Murray Roberts


Deep-sea Research Part Ii-topical Studies in Oceanography | 2011

Antarctic deep-sea meiofauna and bacteria react to the deposition of particulate organic matter after a phytoplankton bloom

Gritta Veit-Köhler; Katja Guilini; Ilka Peeken; Oliver Sachs; Eberhard Sauter; Laura Würzberg


Deep-sea Research Part Ii-topical Studies in Oceanography | 2014

Indications for algae-degrading benthic microbial communities in deep-sea sediments along the Antarctic Polar Front

S. Emil Ruff; David Probandt; Ann-Christine Zinkann; Morten Hvitfeldt Iversen; Christine Klaas; Laura Würzberg; Nicole Krombholz; Dieter Wolf-Gladrow; Rudolf Amann; Katrin Knittel


Deep-sea Research Part Ii-topical Studies in Oceanography | 2015

Wood-associated fauna collected during the KuramBio expedition in the North West Pacific

Enrico Schwabe; Ilse Bartsch; Magdalena Błażewicz-Paszkowycz; Nils Brenke; Alexei V. Chernyshev; Nikolaus O. Elsner; Viola Fischer; Anna Jażdżewska; Marina V. Malyutina; Dmitry M. Miljutin; Maria A. Miljutina; Gennady M. Kamenev; Ivana Karanovic; Anastassya S. Maiorova; Laura Würzberg


Deep-sea Research Part Ii-topical Studies in Oceanography | 2014

Composition and abundance of epibenthic-sledge catches in the South Polar Front of the Atlantic

A. Brandt; Charlotte Havermans; Dorte Janussen; K.M. Jörger; A. Meyer-Löbbecke; S. Schnurr; Myriam Schüller; Enrico Schwabe; Simone N. Brandão; Laura Würzberg

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A. Brandt

American Museum of Natural History

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Nils Brenke

Ruhr University Bochum

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Oliver Sachs

Alfred Wegener Institute for Polar and Marine Research

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