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The sea ice does not only determine the ecology of ice biota, but it also influences the pelagic systems under the ice cover and at ice edges. In this paper, new estimates of Arctic and Antarctic production of biogenic carbon are derived, and differences as well as similarities between the two oceans are examined. In ice-covered seas, high algal(More)
Food-web processes are important controls of oceanic biogenic carbon flux and ocean-atmosphere carbon dioxide exchange. Two key controlling parameters are the growth efficiencies of the principal trophic components and the rate of carbon remineralization. We report that bacterial growth efficiency is an inverse function of temperature. This relationship(More)
The Joint Global Ocean Flux Study of the Scientific Committee on Oceanic Research (SCOR) is a Core Project of the International Geosphere-Biosphere Programme (IGBP). It is planned by a SCOR/IGBP Scientific Steering Committee. In addition to funds from the JGOFS sponsors, SCOR and IGBP, support is provided for international JGOFS planning activities by(More)
Corals live in symbiosis with dinoflagellates of the genus Symbiodinum. These dinoflagellates translocate a large part of the photosynthetically fixed carbon to the host, which in turn uses it for its own needs. Assessing the carbon budget in coral tissue is a central question in reef studies that still vexes ecophysiologists. The amount of carbon fixed by(More)
The seasonal patterns of phytoplankton biomass and production were determined in the North Water, located West (o751W), and South (o761N). Phytoplankton biomass and production were low during April throughout the North Water. Biomass first increased in the East during April. From there, the biomass spread north-and westwards during May–June, when the bloom(More)
Latitudinal gradients in diversity are among the most striking features in ecology. For terrestrial species, climate (i.e. temperature and precipitation) is believed to exert a strong influence on the geographical distributions of diversity through its effects on energy availability. Here, we provide the first global description of geographical variation in(More)
In April 1983, differential-enrichment bioassays were conducted on natural sea-ice microalgae from Hudson Bay, Canadian Arctic. Incubations were done both in the laboratory (at about 4 "-5°C) and in situ at the ice-water interface (-1.5 " C). Actual growth of the cultures was nutrient limited. On the basis of our observations and using recalculated data(More)
Temperature is a powerful correlate of large-scale terrestrial and marine diversity patterns but the mechanistic links remain unclear. Whilst many explanations have been proposed, quantitative predictions that allow them to be tested statistically are often lacking. As an important exception, the metabolic theory of ecology (MTE) provides a rather robust(More)
There are indications that the final biomass attained by sea-ice microalgae in southeastern Hudson Bay is nitrogen limited. The present study investigates the possibility that the rate at which the final yield is approached is also nitrogen limited. Nutrient data suggest that nitrogen was actively taken up by the microalgae, and periodically replenished by(More)
In April-May 1986, sea-ice microalgae (southcastern Hudson Bay, Canadian Arctic) were acclimated to temperatures ranging from-1.5° to 10°C for short periods (3 h), after which photosynthesis and carboxylating enzyme activities were measured. P max b increased after acclimation to 10°C while photosynthetic parameters α, β and Ik as well as activities of PePC(More)