Current patterns in McMurdo Sound, Antarctica and their relationship to local biotic communities

Barry, James; Dayton, Paul K.

doi:10.1007/bf00442028

Cited by 139 publications

(129 citation statements)

References 28 publications

(43 reference statements)

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“…For example, proxies for enhanced bottom current (ripple marks, current and to some extent erosion) are considered indicators for important ecological factors (Dorschel et al, 2007(Dorschel et al, , 2009). Higher energetic environments should have a significant effect on the epibenthos, especially since bottomnear currents provide an advective food transport for filter feeders (Barry and Dayton, 1988). The environmental factor "ripple marks" is five times among the relevant sediment parameters (Table 2), but other current indicators appear completely irrelevant.…”

Section: Benthic Habitats and Environmental Driversmentioning

confidence: 99%

The influence of the geomorphological and sedimentological settings on the distribution of epibenthic assemblages on a flat topped hill on the over-deepened shelf of the western Weddell Sea (Southern Ocean)

et al. 2014

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Abstract. Epibenthos communities play an important role in the marine ecosystems of the Weddell Sea. Information on the factors controlling their structure and distribution are, however, still rare. In particular, the interactions between environmental factors and biotic assemblages are not fully understood. Nachtigaller Hill, a newly discovered seabed structure on the over-deepened shelf of the northwest Weddell Sea (Southern Ocean), offers a unique site to study these interactions in a high-latitude Antarctic setting. Based on highresolution bathymetry and georeferenced biological data, the effect of the terrain and related environmental parameters on the epibenthos was assessed. At Nachtigaller Hill, both geomorphological and biological data showed complex distribution patterns, reflecting local processes such as iceberg scouring and locally amplified bottom currents. This variability was also generally reflected in the variable epibenthos distribution patterns although statistical analyses did not show strong correlations between the selected environmental parameters and species abundances. By analysing the interactions between environmental and biological patterns, this study provides crucial information towards a better understanding of the factors and processes that drive epibenthos communities on the shelves of the Weddell Sea and probably also on other Antarctic shelves.

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Section: Benthic Habitats and Environmental Driversmentioning

confidence: 99%

The influence of the geomorphological and sedimentological settings on the distribution of epibenthic assemblages on a flat topped hill on the over-deepened shelf of the western Weddell Sea (Southern Ocean)

et al. 2014

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“…The jaws Were subsequently washed in 95% ethanol and dried. Jaw size was Barry and Dayton (1988), Barry et al (1994), Dayton and Oliver (1977), Dayton et al (1974), Dayton et al (1986), Knox (1990), McClintock et al (1988), Miller and Pearse (1991), Rivkin (1991) Knox (1990) c In austral summer measured from the tip to the upper inner edge. The position of the tetracycline mark was determined using a 350 nm UV-B lamp.…”

Section: Growth Analysismentioning

confidence: 99%

Growth and production of Sterechinus neumayeri (Echinoidea: Echinodermata) in McMurdo Sound, Antarctica

et al. 1995

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Population dynamics of Sterechinus neumayeri were investigated at four sites in McMurdo Sound: Cape Evans, McMurdo Station, East Cape Armitage and New Harbor. The annual formation of natural growth bands in the jaws of the Aristotle's lantern was verified by a tagging-recapture experiment. Growth functions based on natural growth bands indicated differences among stations but showed S. neumayeri to be a slow growing species, reaching its maximum diameter of 70mm at an age of about 40 yr. Annual production ranged between 2.4 (C. Evans) and 0.65 g ash free dry mass m-2 (New Harbor) and was related to differences in food conditions. More than 95% of total production was invested in reproduction, and less than 5% was invested in somatic growth. Consumption estimates for S. neumayeri showed this species to play a significant role in the benthic trophic web of McMurdo Sound.

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“…While the tides typically generate maximum flows of ∼0.15-0.20 m s −1 in the Sound-proper (Barry and Dayton, 1988;Leonard et al, 2006;Stevens et al, 2006), at the MSC station we saw flow magnitudes reach 0.40 m s −1 (Fig. 4c and d).…”

Section: Velocity Datamentioning

confidence: 55%

“…away from the tip). Residual flows on the east side of the Sound have mostly been southward (Barry and Dayton, 1988;Dinniman et al, 2007; although some authors suggest northward flow is possible (Lewis and Perkin, 1985). This suggests our observations show the influence of tidal rectification whereby the close presence of topography results in the tide being asymmetric.…”

Section: Kinematics and Water Column Structurementioning

confidence: 58%

Flow and mixing near a glacier tongue: a pilot study

et al. 2011

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Abstract.A glacier tongue floating in the coastal ocean presents a significant obstacle to the local flow and so influences oceanic mixing and transport processes. Here acoustic Doppler current profiler and shear microstructure observations very near to a glacier tongue side-wall capture flow accelerations and associated mixing. Flow speeds reached around 40 cm s −1 , twice that of the ambient tidal flow amplitude, and generated vertical velocity shear squared as large as 10 −5 s −2 . During the time of maximum flow, turbulent energy dissipation rates reached 10 −5 m 2 s −3 , around three decades greater than local background levels. This is in keeping with estimates of the gradient Richardson Number which dropped to ∼1 during maximum flow. Associated vertical diffusivities estimated from the shear microstructure results were substantial, reflecting the influence of the glacier on velocity gradients.

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Current patterns in McMurdo Sound, Antarctica and their relationship to local biotic communities

Cited by 139 publications

References 28 publications

The influence of the geomorphological and sedimentological settings on the distribution of epibenthic assemblages on a flat topped hill on the over-deepened shelf of the western Weddell Sea (Southern Ocean)

The influence of the geomorphological and sedimentological settings on the distribution of epibenthic assemblages on a flat topped hill on the over-deepened shelf of the western Weddell Sea (Southern Ocean)

Growth and production of Sterechinus neumayeri (Echinoidea: Echinodermata) in McMurdo Sound, Antarctica

Flow and mixing near a glacier tongue: a pilot study

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