Dimension effects of enclosures on ecological processes in pelagic systems

Article Abstract:

Dimension effects of enclosures on ecological processes in pelagic systems are discussed based on examination of several characteristics inherent to experimental ecosystems for influence on ecological processes in five cylindrical indoor benthic-pelagic enclosures of different size and shape. It was found, among other findings, that factors that lead to the development of different plankton assemblages can be related to mesocosm geometry and that the ratio of light-receiving surface area-to-water column volume regulates gross primary productivity and the No(2ub.3)(neg) consumption rate. Area-to-folume effects may have substantial influence, but likely can be allowed for to cut down on artifacts of enclosure.

Biological research, Plankton, Experimental design, Research design, Benthos, Benthic zone, Biology, Experimental

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Effect of CO(sub.2) concentration of C:N:P ratio in marine phytoplankton: a species comparison

Article Abstract:

A marine phytoplankton species comparison has been carried out from the point of view of effect of carbon dioxide concentration on C:N:P ratio. Variable concentrations of dissolved molecular carbon dioxide were used in batch cultures under high-light, nutrient-replete conditions with varying irradiance cycles. In 6 of 7 species, elemental composition was affected by variations, with magnitude of nutrient ratio change similar over the experimental range. If the results are representative for natural populations, carbon dioxide-related changes in plankton stoichiometry are not likely to have a significant effect on the ocean carbon cycle.

Carbon dioxide, Marine ecology

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An optimization-based model of iron-light-ammonium colimitation of nitrate uptake and phytoplankton growth

Article Abstract:

A model of iron-light-ammonium colimitation of phytoplankton growth and nitrate uptake is discussed. The model is optimization based with the basic postulate that, when iron is in short supply, that limitation affects ability of cells to acquire carbon and nitrogen. It is also postulated that through evolutionary history phytoplankton have developed ways to partition scarce iron between nitrogen acquisition and carbon acquisition to maximize the rate of growth. Some physiological detail was sacrificed in the model to permit use of the optimality argument.

Usage, Physiological aspects, Mathematical models, Ammonium, Iron, Iron (Metal), Nitrates

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