... can't be neglected since different ecosystems may react differently to different sources of pollution. The major obstacle facing the biological approach is determining the baseline characteristics for biological communities for each type of water bodies. These results were reached through, investigating the biological and chemical aspects of the ecosystem and the relationship between the ecosystem and ... of physical or structural habitat alterations (e.g., dredging, filling, channelization) can also be detected. Biological criteria, derived form data collected from bioassessments, provi...

• Word Count: 1076
• Approx Pages: 4
• Grade Level: Graduate