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Metabolism Of Antarctic Micronektonic Crustacea As A Function Of Depth Of Occurrence And Season, Joseph J. Torres, A. V. Aarset, J. Donnelly, Thomas L. Hopkins, T. M. Lancraft, D. G. Ainley
Metabolism Of Antarctic Micronektonic Crustacea As A Function Of Depth Of Occurrence And Season, Joseph J. Torres, A. V. Aarset, J. Donnelly, Thomas L. Hopkins, T. M. Lancraft, D. G. Ainley
Marine Science Faculty Publications
Oxygen comsumption rates were determined on 21 species of crustaceans typical of the Southern Ocean micronektonic crustacean assemblage during spring (November), fall (March), and winter (June-August). Specimens were collected in the Scotia-Weddell Sea region in the vicinity of 60-degrees-S, 40-degrees-W in the upper 1000 m of the water column. Respiration (y, mul O2mg-1 wet mass h-1) declined with depth of occurrence (x, m) according to the equation y = 0.125 x-0.172 +/- 0.052 (p < 0.05) despite the isothermal character of the water column, suggesting that lower metabolic rates are a temperature-independent adaptation to life in the deep sea. Three species of Crustacea showed a lowered metabolism during the winter season: the krill Euphausia superba and the 2 hyperiid amphipods Cyllopus lucasii and Vibilia stebbingi. Critical oxygen partial pressure (Pc) varied between 29 and 52 mm Hg, well below the lowest PO2 found in the water column. It is suggested that the long nights of the Antarctic winter decrease the effectiveness of visual predation in the epipelagic zone, allowing lowered metabolic rates to be a viable overwintering strategy for some species.
Proximate Composition And Overwintering Strategies Of Antarctic Micronektonic Crustacea, Joseph J. Torres, J. Donnelly, Thomas L. Hopkins, T. M. Lancraft, A. V. Aarset, D. G. Ainley
Proximate Composition And Overwintering Strategies Of Antarctic Micronektonic Crustacea, Joseph J. Torres, J. Donnelly, Thomas L. Hopkins, T. M. Lancraft, A. V. Aarset, D. G. Ainley
Marine Science Faculty Publications
Proximate (protein, lipid, carbohydrate and chitin) and elemental (carbon and nitrogen) composition were determined for 18 species of Antarctic micronektonic Crustacea, representing the majority of species found in the Antarctic water column. Individuals used in the analyses were captured during fall and winter; for 8 species data were collected in both seasons. Seven of the 8 species showed some evidence that combustion of body stores were an aid to surviving the winter months; comparison with data from other investigators suggests that most of the species inhabiting shallow and mid-depths exhibit some degree of combustion of body stores during winter. Three …