caa a22 4500 467885796 CHVBK 20180406152734.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10021-006-0012-6 doi (NATIONALLICENCE)springer-10.1007/s10021-006-0012-6 Trends in Summer Chemistry Linked to Productivity in Lakes Recovering from Acid Deposition in the Adirondack Region of New York [Elektronische Daten] [B. Momen, G. Lawrence, S. Nierzwicki-Bauer, J. Sutherland, L. Eichler, J. Harrison, C. Boylen] The US Environmental Protection Agency established the Adirondack Effects Assessment Program (AEAP) to evaluate and monitor the status of biological communities in lakes in the Adirondack region of New York that have been adversely affected by acid deposition. This program includes chemical analysis of 30 lakes, sampled two to three times each summer. Results of trends analysis for lake chemistry and chlorophyll a (chlor a) are presented for 1994 to 2003, and a general comparison is made with recent results of the Adirondack Long-Term Monitoring (ALTM) Program, which included chemical analysis of all but two of these lakes (plus an additional 24 lakes) monthly, year-round for 1992-2004. Increases in pH were found in 25 of the 30 AEAP lakes (P < 0.05) and increases in acid-neutralizing capacity (ANC) were found in 12 of the 30 lakes (P < 0.05). Concentrations of both SO 4 2− and Mg2+ decreased in 11 lakes (P < 0.05), whereas concentrations of NO 3 − decreased in 20 lakes (P < 0.05). Concentrations of NH 4 + decreased in 10 lakes at a significance level of P < 0.05 and in three other lakes based on P < 0.1. Concentrations of inorganic and organic monomeric aluminum generally were below the reporting limit of 1.5μmol L−1, but decreases were detected in four and five lakes, respectively (P < 0.1). Concentrations of chlor a increased in seven lakes at a significance level of P < 0.05 and two lakes at a significance level of P < 0.1. A significant inverse correlation was also found between chlor a and NO 3 − concentrations in nine lakes at a significance level of P < 0.05 and two lakes at a significance level of P < 0.1. Results of AEAP analysis of lake chemistry were similar to those of the ALTM Program, although decreases in SO 4 2− concentrations were more evident in the year-round ALTM record. Overall, the results suggest (a) a degree of chemical recovery from acidification during the summer, (b) an increase in phytoplankton productivity, and (c) a decreasing trend in NO 3 − concentrations resulting from the increased productivity. Springer Science+Business Media, Inc., 2007 acid deposition nationallicence productivity nationallicence lake chemistry nationallicence summer chemistry nationallicence nitrogen nationallicence chorophylla nationallicence Adirondack lakes nationallicence Momen B. Department of Natural Resource Sciences and LA, University of Maryland, 20742, College Park, Maryland, USA aut Lawrence G. US Geological Survey, 425 Jordan Road, 12180, New York, Troy, USA aut Nierzwicki-Bauer S. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut Sutherland J. New York State Department of Environmental Conservation, 625 Broadway, 12233-3502, New York, Albany, USA aut Eichler L. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut Harrison J. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut Boylen C. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut Ecosystems Springer-Verlag; www.springer-ny.com 9/8(2006-12-01), 1306-1317 1432-9840 9:8<1306 2006 9 10021 https://doi.org/10.1007/s10021-006-0012-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-006-0012-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Momen B. Department of Natural Resource Sciences and LA, University of Maryland, 20742, College Park, Maryland, USA aut NATIONALLICENCE 700 1- Lawrence G. US Geological Survey, 425 Jordan Road, 12180, New York, Troy, USA aut NATIONALLICENCE 700 1- Nierzwicki-Bauer S. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut NATIONALLICENCE 700 1- Sutherland J. New York State Department of Environmental Conservation, 625 Broadway, 12233-3502, New York, Albany, USA aut NATIONALLICENCE 700 1- Eichler L. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut NATIONALLICENCE 700 1- Harrison J. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut NATIONALLICENCE 700 1- Boylen C. Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive, 12810, New York, Bolton Landing, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/8(2006-12-01), 1306-1317 1432-9840 9:8<1306 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer