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DOI | 10.1016/j.ecolind.2017.10.070 |
Mapping watershed integrity for the conterminous United States | |
Thornbrugh, Darren J.1,4; Leibowitz, Scott G.2; Hill, Ryan A.1; Weber, Marc H.2; Johnson, Zachary C.1; Olsen, Anthony R.2; Flotemersch, Joseph E.3; Stoddard, John L.2; Peck, David V.2 | |
发表日期 | 2018-02-01 |
ISSN | 1470-160X |
卷号 | 85页码:1133-1148 |
英文摘要 | Watershed integrity is the capacity of a watershed to support and maintain the full range of ecological processes and functions essential to sustainability. Using information from EPA's StreamCat dataset, we calculated and mapped an Index of Watershed Integrity (IWI) for 2.6 million watersheds in the conterminous US with first-order approximations of relationships between stressors and six watershed functions: hydrologic regulation, regulation of water chemistry, sediment regulation, hydrologic connectivity, temperature regulation, and habitat provision. Results show high integrity in the western US, intermediate integrity in the southern and eastern US, and the lowest integrity in the temperate plains and lower Mississippi Valley. Correlation between the six functional components was high (r = 0.85-0.98). A related Index of Catchment Integrity (ICI) was developed using local drainages of individual stream segments (i.e., excluding upstream information). We evaluated the ability of the IWI and ICI to predict six continuous site-level indicators with regression analyses three biological indicators and principal components derived from water quality, habitat, and combined water quality and habitat variables using data from EPA's National Rivers and Streams Assessment. Relationships were highly significant, but the IWI only accounted for 1-12% of the variation in the four biological and habitat variables. The IWI accounted for over 25% of the variation in the water quality and combined principal components nationally, and 32-39% in the Northern and Southern Appalachians. We also used multinomial logistic regression to compare the IWI with the categorical forms of the three biological indicators. Results were consistent: we found positive associations but modest results. We compared how the IWI and ICI predicted the water quality PC relative to agricultural and urban land use. The IWI or ICI are the best predictors of the water quality PC for the CONUS and six of the nine ecoregions, but they only perform marginally better than agriculture in most instances. However, results suggest that agriculture would not be appropriate in all parts of the country, and the index is meant to be responsive to all stressors. The IWI in its present form (available through the StreamCat website; https://www.cpa.gov/national-aquatic-resource-surveys/streamcat) could be useful for management efforts at multiple scales, especially when combined with information on site condition. The IWI could be improved by incorporating empirical or literature-derived relationships between functional components and stressors. However, limitations concerning the absence of data for certain stressors should be considered. |
英文关键词 | Catchment integrity;Sustainable watershed management;Anthropogenic stressors;IWI;ICI;NASA;StreamCat;Water quality |
语种 | 英语 |
WOS记录号 | WOS:000430634500112 |
来源期刊 | ECOLOGICAL INDICATORS
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/58988 |
作者单位 | 1.US EPA, ORISE, Natl Hlth & Environm Effects Res Lab, Western Ecol Div, 200 SW 35th St, Corvallis, OR 97333 USA; 2.US EPA, Natl Hlth & Environm Effects Res Lab, 200 SW 35th St, Corvallis, OR 97333 USA; 3.US EPA, Natl Exposure Res Lab, 26 W Martin Luther King Dr, Cincinnati, OH 45268 USA; 4.Natl Pk Serv, Northern Great Plains Network, 231 East St Joseph St, Rapid City, SD 55701 USA |
推荐引用方式 GB/T 7714 | Thornbrugh, Darren J.,Leibowitz, Scott G.,Hill, Ryan A.,et al. Mapping watershed integrity for the conterminous United States[J]. 美国环保署,2018,85:1133-1148. |
APA | Thornbrugh, Darren J..,Leibowitz, Scott G..,Hill, Ryan A..,Weber, Marc H..,Johnson, Zachary C..,...&Peck, David V..(2018).Mapping watershed integrity for the conterminous United States.ECOLOGICAL INDICATORS,85,1133-1148. |
MLA | Thornbrugh, Darren J.,et al."Mapping watershed integrity for the conterminous United States".ECOLOGICAL INDICATORS 85(2018):1133-1148. |
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