![]() Yellowish-green, brown, gray or black water or dark sediments.Weather conditions, season, time of day.Click on the diagram to view a larger version. A simple conceptual diagram illustrating causal pathways, from sources to impairments, related to dissolved oxygen. The list is intended to guide you in collecting evidence to support, weaken or eliminate DO as a candidate cause.įor more information on specific entries, go to the When to List tab.Ĭonsider listing DO as a candidate cause when the following sources and activities, site evidence and biological effects are present:įigure 2. 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). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |