Microbial breakdown of Phaeocystis mucopolysaccharides

Article Abstract:

Study of the degradability of Phaeocystis mucus carbohydrates by heterotrophic bacteria is discussed. The study used partially purified mucus as a substrate in oxic and anoxic enrichments of marine bacteria. The degradable of the important part of the biomass of the organism is of help for understanding impact of Phaeocystis blooms on the marine carbon cycle. Breakdown of the mucopolysaccharides, during which the carbohydrate composition of the residual fraction did not change, slowed greatly after about 15 days. Incomplete degradation was the result of release of inhibitors produced during breakdown.

Netherlands, Physiological aspects, Algae, Bacteria, Heterotrophic, Heterotrophic bacteria, Carbon cycle (Biogeochemistry), Carbon cycle, Mucus

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Trophic interaction in open systems: effects of predators and nutrients on stream food chains

Article Abstract:

Effects of predators and nutrients on stream food chains are discussed as related to trophic interaction in open systems. The combined effects of predators and nutrients on community organization have been tested in an open system in Sycamore Creek, a central Arizona perennial desert stream. It was not possible to conclusively determine mechanism for the increase in algal and herbivore biomass seen as a response to nutrient addition. REsults suggest adjustment of consumer dispersal rates in response to predators and resources can influence biomass at multiple trophic levels

Arizona, Predatory animals, Food chains (Ecology), Food chains, Stream ecology

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