The checklist below will help you identify key data and information useful for determining whether to include DO among your candidate causes. DO should be a candidate cause when potential human sources and activities, site observations or observed effects support portions of the source-to-impairment pathways (see Figure 2). This module addresses low or excessive DO as a proximate stressor. Checklist of Sources, Site Evidence and Biological Effects
This module provides advice for deciding whether to include depleted or (less commonly) excessive DO as a candidate cause. Sufficient DO is essential to growth and reproduction of aerobic aquatic life (e.g., see Murphy 2006, Giller and Malmqvist 1998, Allan 1995). Water also absorbs oxygen released by aquatic plants during photosynthesis. Oxygen enters water by direct absorption from the atmosphere, which is enhanced by turbulence (see Figure 1). Consider Not Listing (Eliminating) Dissolved Oxygen as a Candidate Causeĭissolved oxygen (DO) refers to the concentration of oxygen gas incorporated in water.Consider Contributing, Modifying and Related Factors as Candidate Causes.Consider Listing Dissolved Oxygen as a Candidate Cause.Checklist of Sources, Site Evidence and Biological Effects.This natural stream in a forest setting has water flowing over boulders, causing turbulence and aeration.
0 kommentar(er)
