Carbon flux in ice-ocean-plankton systems of the Bellingshausen Sea during a period of ice retreat
Murphy, E.J.; Boyd, P.W.; Leakey, R.J.G.; Atkinson, A.; Edwards, E.S.; Robinson, C.; Priddle, J.; Bury, S.J.; Robins, D.B.; Burkill, P.H.; Savidge, G.; Owens, N.J.P.; Turner, D. (1998). Carbon flux in ice-ocean-plankton systems of the Bellingshausen Sea during a period of ice retreat. J. Mar. Syst. 17(1-4): 207-227. https://dx.doi.org/10.1016/S0924-7963(98)00039-6
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, more
Also appears in:Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more
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| Keywords |
Algae
Algal blooms
Aquatic communities > Plankton > Phytoplankton
Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle
Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Carbon cycle
Environments > Aquatic environment > Marine environment
Epontic organisms
Ice
Ice cover
Ice edge
Microorganisms
PSW, Bellingshausen Sea
Marine/Coastal |
| Authors | | Top |
- Murphy, E.J.
- Boyd, P.W.
- Leakey, R.J.G.
- Atkinson, A.
- Edwards, E.S.
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- Robinson, C.
- Priddle, J.
- Bury, S.J.
- Robins, D.B.
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- Burkill, P.H.
- Savidge, G.
- Owens, N.J.P., more
- Turner, D.
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| Abstract |
Most analyses of marine microbial systems in the seasonally ice covered areas of the Southern Ocean have been based on data from the major embayment areas of the Ross and Weddell Seas. In this study data were collected at stations covering a range of regimes from full ice cover through to open water in the Bellingshausen Sea. A major feature of the production system was a rapid retreat of the ice-edge, which uncoupled the marginal ice zone from a phytoplankton bloom which remained associated with a frontal system. This bloom was maintained, and probably initiated, in an unusual environment generated by the interaction between the marginal ice zone and the front. Size-based analyses of the microbial system were derived for ice-covered, recently ice-covered and open water sites. Estimates of standing stocks and key rate processes were combined to produce a single food web network for each station. The under-ice system was one of low production and low recycling but apparently high retention. As the ice retreated the microbial systems to the north began to develop, but these were constrained by grazing pressure. The bloom in the area appeared to be sustained even though estimated losses were far higher than production, although the high sedimentation losses expected were not observed. The carbon flow networks are discussed in relation to the environmental changes and the interaction of the marginal ice zone and the frontal system appears crucial to the phytoplankton. Microzooplankton grazing is implicated as a major controlling factor. The local microbial dynamics are strongly influenced by material which was produced at an earlier time and somewhere else in the Southern Ocean. |
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