Lake Erie Central Basin Total Phosphorus Trend Analysis from 1968 to 1982 |
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| Affiliation: | 1. Centre of Excellence for Environmental Decisions, School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia;2. School of Geography, Planning and Environmental Management, University of Queensland, St. Lucia, QLD 4072, Australia;3. Ecosystem Science and Management Program, University of Northern British Columbia, Prince George v2n4z9, Canada;4. International Union for Conservation of Nature (IUCN), Rue Mauverney 28, 1196 Gland, Switzerland;5. European Commission, Joint Research Centre (JRC), Via Enrico Fermi 2749, 21027 Ispra, VA, Italy;6. United Nations Environment Programme World Conservation Monitoring Centre (UNEP-WCMC), Cambridge, UK;7. Wildlife Conservation Society, Global Conservation Program, Bronx, NY 10460, USA;1. University of Wisconsin-Milwaukee, School of Freshwater Sciences, 600 E. Greenfield Ave., Milwaukee, WI, 53204, USA;2. National Park Service, 2800 Lake Shore Drive East, Ashland, WI, 54806, USA |
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| Abstract: | The total phosphorus data from 1968 to 1982 in the Lake Erie central basin trend study area was analyzed to determine in-lake responses to the Great Lakes Water Quality Agreement (GLWQA) phosphorus loading reduction program. The available data for each year were divided into five subsets according to time of year and depth of the water column. Each data subset was regressed as a function of time and total phosphorus loadings to Lake Erie. Linear regression analysis indicates that the in-lake phosphorus concentrations have been decreasing and are well correlated with decreased loadings to the lake. The highest rate of phosphorus decrease with time (0.56 ± 0.10 mg · m−3 yr−1) was obtained by using epilimnetic concentrations from April to December for each year. This data subset also shows the best correlation with decreasing phosphorus loadings. From 1968 to 1982, Lake Erie offshore phosphorus concentrations responded to decreasing external phosphorus loadings at a rate of 0.45 ± 0.09 mg · m−3 per thousand metric tonnes. |
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