The chemical cycle and bioaccumulation of mercury
Article Abstract:
The major factor that determines the concentration of mercury in the biota is the methylmercury concentration in water. That concentrations is controlled by the relative efficiency of methylation/demethylation. Demethylation is both photochemical and biological. Methylmercury is better retained than the inorganic form by organisms. For that reason methylmercury is bioconcentrated instead of inorganic mercury. Anoxic waters/sediments are important sources of methylmercury, likely the result of the methylating activity of sulfate-reducing bacteria. In surface water methylcercury may come from anoxic layers. Understanding of factors that control the bioconcentration of mercury are not well understood.
Publication Name: Annual Review of Ecology and Systematics
Subject: Environmental issues
ISSN: 0066-4162
Year: 1998
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Chemical detection of natural enemies by arthropods an ecological perspective
Article Abstract:
Variation in prey responses and the evidence for learning by arthropods in avoiding enemies are considered. The evidence, the trade-offs and the key mechanisms offs involved in chemical detection of enemies by potential arthropod prey are discussed. Major questions for future study are identified.
Publication Name: Annual Review of Ecology and Systematics
Subject: Environmental issues
ISSN: 0066-4162
Year: 2001
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Dispersal in freshwater invertebrates
Article Abstract:
Research on dispersal in freshwater invertebrates is reviewed focusing on systems that have received the most investigation. Evidence that some taxa achieve two-dimensional dispersal by exploiting spatial and temporal scales. Influence of humans on dispersal is considered.
Publication Name: Annual Review of Ecology and Systematics
Subject: Environmental issues
ISSN: 0066-4162
Year: 2001
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