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- Title
Reconstructing the historical trophic status of northwestern Pennsylvania lakes using GIS.
- Authors
Ostrofsky, M.; Bradley, C.
- Abstract
From each of 46 watersheds in glaciated northwestern Pennsylvania we estimated phosphorus export (kg P/ha/yr) from weekly or twice-weekly measured stream phosphorus concentrations and measured stream discharges, and determined land covers using GIS. Simple and step-down multiple regression analyses yielded models that explained 24% of the variation in P export using land cover within whole watersheds, and 64% of the variation using land cover within 200 m riparian buffers. We used these models to predict P loading to seven lakes and found that predicted lake [P] was consistent with measured lake [P]. To estimate pre-settlement lake [P] we reapplied the P export models with the assumption that human-impacted land covers were originally forests. Predicted (hindcast) pre-settlement lake [P] indicated that six of the seven lakes were edaphically mesotrophic (10 < [P] < 20 μg/l). Lake remediation targets set on the assumption that area lakes were historically oligotrophic ([P] < 10 μg/l) will be unattainable.
- Subjects
PENNSYLVANIA; WATERSHEDS; GLACIAL landforms; PHOSPHORUS; SEWAGE disposal in rivers, lakes, etc.; STREAMFLOW; ENVIRONMENTAL protection; ENVIRONMENTAL engineering; REGRESSION analysis
- Publication
Hydrobiologia, 2006, Vol 571, Issue 1, p273
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-006-0245-6