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Food webs
Food webs

... trophic levels. c. Both detrital and grazing food chains. ...
Conservation of Aquatic Insects - National Biodiversity Authority
Conservation of Aquatic Insects - National Biodiversity Authority

... Climate change signal study of Prof. Ormerod & Dr. Durance on stream macroinvertebrates including aquatic insects spanning 25 years in UK predicts that at the present rate the spring time abundance in streams could decline by twenty one percent for every 1˚C rise in temperature. Stream species numbe ...
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... Under anoxic conditions anaerobic bacteria flourish. Anaerobic bacteria often produce foul smelling compounds such as hydrogen sulphide (H2S), thioalcohols (RSH) and ammonia (NH3). Levels of dissolved oxygen of >7mg/l in surface marine and freshwaters, depending upon temperature, represent essential ...
Introductory pages - Garry Oak Ecosystems Recovery Team
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Human impact on the nitrogen cycle



Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.
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