| PC18 Biogeochemical Cycles |
| Date: Thursday, February 15, 2001 |
| Location: Southwest Hall |
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| Bushaw-Newton, K, L, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, bushaw@acnatsci.org |
| Johnson, T, E, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Pizzuto, J, E, University of Delaware, Newark, USA, |
| Horwitz, R, J, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Charles, D, F, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Ashley, J, T, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Gatenby, C, M, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Velinsky, D, J, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Kreeger, D, A, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
| Hart, D, D, Academy of Natural Sciences, Patrick Center for Environmental Research, Philadelphia, USA, |
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| RESTORATION OF MANATAWNY CREEK, PA THROUGH DAM REMOVAL |
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| Dam removal has been proposed as a method for restoring the integrity of streams and rivers throughout the world. Currently, little comprehensive information exists on how dam removal affects the structure and function of stream ecosystems. A low-head, run-of-the-river dam on Manatawny Creek, Pennsylvania was removed in August 2000. At sites upstream and downstream of the dam, we have been monitoring several physical, chemical, and biological components of the system to document the spatial and temporal changes associated with removal. Prior to removal, populations of macroinvertebrates, mussels, benthic algae and fish were quantified above and below the dam to provide a baseline for subsequent changes. Pre-removal sampling demonstrated that fine sediment did not accumulate in the impoundment and there were no apparent upstream-downstream differences in several of the chemical parameters (e.g., dissolved oxygen and nutrients). Following removal, initial sediment movement was minimal. The process of channel formation is expected to occur over the following months to years. Our results will provide information to both scientific and management communities on the effectiveness of dam removal in the restoration of riverine ecosystems. |
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