By David Sigee

This detailed textbook takes a extensive examine the speedily increasing box of freshwater microbiology. targeting the interactions among viruses, micro organism, algae, fungi and micro-invertebrates, the booklet supplies a large organic allure.

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Extra info for Freshwater Microbiology Biodiversity and Dynamic Interactions of Microorganisms in the Aquatic Environment

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2003). Stable isotope analysis. Uptake of stable carbon and nitrogen isotopes by primary consumers, and selective retention during biomass transfer, provides useful information on patterns of ingestion in aquatic food webs. 12). 15N levels in particular had a clear trend of stepwise enrichment with progression from primary producer to zooplankton, pelagic fish and freshwater seal. 2. The technique can also be used to demonstrate changes in food web dynamics caused, for example, by eutrophication.

2), showed that reductions in pH correlated with reductions in food web complexity and species diversity. Schindler (1987), in a study of lake community responses to anthropogenic stress, demonstrated changes in the proportion of r-strategists, organism life spans, species diversity and the relative openness of the ecosystem. 4 Assessment of ecosystem stability The ability of ecosystems to resist stress and return to, or maintain, their biological integrity is an example of the general principle of homeostasis or maintenance of the internal environment.

Trophic interactions between groups are indicated as carbon flow. This relatively simple diagram illustrates some of the complexities of the food web. These include multiple connections – picoalgae, for example, are consumed by protozoa, rotifers and copepods – and the fact that protozoa have a key role in both the main trophic sequence and the microbial loop. Interconnections between the different groups give the appearance of a cascade of organisms, and this generalized food web is sometimes referred to as the ‘trophic cascade’ (Carpenter and Kitchell, 1993).

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