caa a22 4500 467903581 CHVBK 20180406152826.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10661-005-9011-x doi (NATIONALLICENCE)springer-10.1007/s10661-005-9011-x Evaluating Ecological Indicators: Lakes In The Northeastern United States [Elektronische Daten] [Paul Murtaugh, Penelope Pooler] We use data from a survey of several hundred lakes in the northeastern United States by the U.S. Environmental Protection Agency to illustrate an approach to identifying promising indicators of lake condition. We construct a hypothetical gold standard of water quality from the first principal component of 16 chemical variables measured in the lakes, and examine its associations with 71 candidate indicators based on measurements of human activity, birds, fish and zooplankton in the lakes or their watersheds. Nonparametric summaries of these associations - based on rank correlations and receiver-operating-characteristic curves - suggest that variables summarizing the extent of human disturbance are generally the strongest indicators. To the extent that our water-quality variable is a useful proxy for ecological condition, our results suggest that easily-obtained measures of human activity are at least as predictive as many of the harder-to-measure biological indicators that have been proposed. Springer Science+Business Media, Inc., 2006 indicator nationallicence monitoring nationallicence ROC curve nationallicence water quality nationallicence zooplankton nationallicence Murtaugh Paul Department of Statistics, Oregon State University, Corvallis, 97331, Oregon, U.S.A. aut Pooler Penelope Department of Statistics, Virginia Polytechnic Institute and State University, Blacksburg, 24061-0439, Virginia, U.S.A. aut Environmental Monitoring and Assessment Kluwer Academic Publishers 119/1-3(2006-08-01), 83-96 0167-6369 119:1-3<83 2006 119 10661 https://doi.org/10.1007/s10661-005-9011-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9011-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murtaugh Paul Department of Statistics, Oregon State University, Corvallis, 97331, Oregon, U.S.A aut NATIONALLICENCE 700 1- Pooler Penelope Department of Statistics, Virginia Polytechnic Institute and State University, Blacksburg, 24061-0439, Virginia, U.S.A aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 119/1-3(2006-08-01), 83-96 0167-6369 119:1-3<83 2006 119 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer