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Scope/Content: Abstract: Multivariate statistical analyses and the U.S. Environmental Protection Agency's Rapid Bioassessment Protocol III were used to assess the chemical water quality, physical habitat, and biological conditions of 59 sample sites in the Juniata Subbasin in central Pennsylvania. Assessment results indicate that approximately one half (55 percent) of the sites support nonimpaired biological communities. Several stream reaches that were described as having highly depressed water quality and biological conditions in the late 1970s have improved dramatically, while some of these waterways are still moderately degraded. Prinipal components and cluster analyses were effective techniques for condensing the water quality data ino a manageable format and for revealing structure in the water quality data. These multivariate statistical analyses enhanced our ability to identify the environmental factors influencing the biological conditions of impaired waterways and the specific relationships that exist between physical habitat, water quality, and stream biological conditions. These relationships, which vary based on ecoregion designation and drainage area size, are presented as topics to be considered by natural resource managers and policy makers.
Ecology and river restoration Dams Dam retirement
Juniata River, PA Susquehanna River, PA United States