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Oceanographic and topographic conditions structure benthic meiofauna communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic)

(2018) PROGRESS IN OCEANOGRAPHY. 162. p.240-256
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Abstract
The marine environment of the tip of the Antarctic Peninsula is characterised by three oceanographically distinct regions for which we linked continental-slope meiofaunal patterns and environmental drivers on a large scale (100-300 km among ecoregions). Samples for meiofauna communities and sediment analyses were collected with a multicorer, water-column data were derived from water samples and CTD recordings. Meiofauna communities including individuals from 19 higher taxa were compared to a set of 16 environmental variables. We detected significant differences between the communities of Weddell Sea and those of Bransfield Strait and Drake Passage. The amount of phytopigments in the sediment, their freshness and the silt and clay content were driving factors for this separation. The highest meiofauna abundances were found at slopes in the Weddell Sea. Food banks may facilitate high standing stocks. There, the highest ever recorded copepod percentages for the Antarctic were related to the highest phytopigment contents while nematodes were extremely abundant even in deeper sediment layers at stations with fresh organic material. For Bransfield Strait and Drake Passage a sampling scheme of slopes and adjacent troughs was applied. The two regions were divided into three geographical "areas" with the two "habitat" types investigated for each area. Multivariate non-parametric permutational analysis of variance (PERMANOVA) showed that in Bransfield Strait slope and trough meiofauna communities differed significantly in all geographical areas while in Drake Passage this was only the case in the East. These differences were explained best by the regionally and topographically distinct characteristics of 7 out of 11 water-column and sediment-bound factors related to sediment grain size, food quantity and quality, water temperature and salinity. Environmental drivers of the benthic habitat are dependent on large-scale oceanographic conditions and are thus sensitive to changes in water mass characteristics, sea-ice cover and the related primary production.
Keywords
Meiobenthos, Nematoda, Copepoda, Environmental settings, Water masses, Current systems, SEDIMENT ACCUMULATION RATES, POLARSTERN EXPEDITION PS81, OXYGEN-MINIMUM ZONE, NEAR-BOTTOM FLOW, DEEP-SEA, METAZOAN MEIOFAUNA, SUBMARINE-CANYON, SOUTHERN-OCEAN, ORGANIC-MATTER, ENVIRONMENTAL VARIABLES

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Citation

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Chicago
Veit-Köhler, Gritta, Stephan Durst, Jan Schuckenbrock, Freija Hauquier, Laura Durán Suja, Boris Dorschel, Ann Vanreusel, and Pedro Martínez Arbizu. 2018. “Oceanographic and Topographic Conditions Structure Benthic Meiofauna Communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic).” Progress in Oceanography 162: 240–256.
APA
Veit-Köhler, Gritta, Durst, S., Schuckenbrock, J., Hauquier, F., Durán Suja, L., Dorschel, B., Vanreusel, A., et al. (2018). Oceanographic and topographic conditions structure benthic meiofauna communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic). PROGRESS IN OCEANOGRAPHY, 162, 240–256.
Vancouver
1.
Veit-Köhler G, Durst S, Schuckenbrock J, Hauquier F, Durán Suja L, Dorschel B, et al. Oceanographic and topographic conditions structure benthic meiofauna communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic). PROGRESS IN OCEANOGRAPHY. 2018;162:240–56.
MLA
Veit-Köhler, Gritta, Stephan Durst, Jan Schuckenbrock, et al. “Oceanographic and Topographic Conditions Structure Benthic Meiofauna Communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic).” PROGRESS IN OCEANOGRAPHY 162 (2018): 240–256. Print.
@article{8558253,
  abstract     = {The marine environment of the tip of the Antarctic Peninsula is characterised by three oceanographically distinct regions for which we linked continental-slope meiofaunal patterns and environmental drivers on a large scale (100-300 km among ecoregions). Samples for meiofauna communities and sediment analyses were collected with a multicorer, water-column data were derived from water samples and CTD recordings. Meiofauna communities including individuals from 19 higher taxa were compared to a set of 16 environmental variables. We detected significant differences between the communities of Weddell Sea and those of Bransfield Strait and Drake Passage. The amount of phytopigments in the sediment, their freshness and the silt and clay content were driving factors for this separation. The highest meiofauna abundances were found at slopes in the Weddell Sea. Food banks may facilitate high standing stocks. There, the highest ever recorded copepod percentages for the Antarctic were related to the highest phytopigment contents while nematodes were extremely abundant even in deeper sediment layers at stations with fresh organic material. For Bransfield Strait and Drake Passage a sampling scheme of slopes and adjacent troughs was applied. The two regions were divided into three geographical "areas" with the two "habitat" types investigated for each area. Multivariate non-parametric permutational analysis of variance (PERMANOVA) showed that in Bransfield Strait slope and trough meiofauna communities differed significantly in all geographical areas while in Drake Passage this was only the case in the East. These differences were explained best by the regionally and topographically distinct characteristics of 7 out of 11 water-column and sediment-bound factors related to sediment grain size, food quantity and quality, water temperature and salinity. Environmental drivers of the benthic habitat are dependent on large-scale oceanographic conditions and are thus sensitive to changes in water mass characteristics, sea-ice cover and the related primary production.},
  author       = {Veit-Köhler, Gritta and Durst, Stephan and Schuckenbrock, Jan and Hauquier, Freija and Durán Suja, Laura and Dorschel, Boris and Vanreusel, Ann and Martínez Arbizu, Pedro},
  issn         = {0079-6611},
  journal      = {PROGRESS IN OCEANOGRAPHY},
  keywords     = {Meiobenthos,Nematoda,Copepoda,Environmental settings,Water masses,Current systems,SEDIMENT ACCUMULATION RATES,POLARSTERN EXPEDITION PS81,OXYGEN-MINIMUM ZONE,NEAR-BOTTOM FLOW,DEEP-SEA,METAZOAN MEIOFAUNA,SUBMARINE-CANYON,SOUTHERN-OCEAN,ORGANIC-MATTER,ENVIRONMENTAL VARIABLES},
  language     = {eng},
  pages        = {240--256},
  title        = {Oceanographic and topographic conditions structure benthic meiofauna communities in the Weddell Sea, Bransfield Strait and Drake Passage (Antarctic)},
  url          = {http://dx.doi.org/10.1016/j.pocean.2018.03.005},
  volume       = {162},
  year         = {2018},
}

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