Thursday, December 31, 2009


National Indicators reflect the range of estimated probabilities (expressed as a frequency of occurrence) of a species occurring in wetlands versus non-wetland across the entire distribution of the species. A frequency, for example, of 67%-99% (Facultative Wetland) means that 67%-99% of sample plots containing the species randomly selected across the range of the species would be wetland. When two indicators are given, they reflect the range from the lowest to the highest frequency of occurrence in wetlands across the regions in which the species is found. A positive (+) or negative (-) sign was used with the Facultative Indicator categories to more specifically define the regional frequency of occurrence in wetlands. The positive sign indicates a frequency toward the higher end of the category (more frequently found in wetlands), and a negative sign indicates a frequency toward the lower end of the category (less frequently found in wetlands). A question mark (?) following a National Indicator denotes a tentative assignment based on the botanical literature and not confirmed by regional review

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Thursday, December 17, 2009

Coastal Erosion

Coastal erosion is a problem for those who live near coasts and for marine organisms living along the coast in bays, estuaries, and shallow waters. We have seen that beaches change with the seasons, and that tsunamis and storm surges can erode coasts. How important is coastal erosion? Are we making it better or worse? What causes erosion? Can it be prevented? Or do we want to allow erosion as a natural process?

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Wednesday, December 9, 2009

New page of erosion articles

EPA Targets Construction-Site Pollution
WASHINGTON - The Environmental Protection Agency issued a final rule Monday aimed at reducing pollution from construction sites, saying that it will significantly improve the quality of water nationwide.
The rule will be phased in over four years, starting in February, and when it is fully in effect, the EPA estimates there will be four billion fewer pounds of sediment discharged from construction sites each year.

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