Record Display for the EPA National Library Catalog
RECORD NUMBER: 268 OF 1680Main Title | Causal analysis of biological impairment in Long Creek : a sandy-bottomed stream in coastal southern Maine. | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CORP Author | Environmental Protection Agency, Washington, DC. National Center for Environmental Assessment. | |||||||||||||||||||||||||||||||
Publisher | National Center for Environmental Assessment, Office of Research and Devleopment, U.S. Environmental Protection Agency, | |||||||||||||||||||||||||||||||
Year Published | 2007 | |||||||||||||||||||||||||||||||
Report Number | EPA/600/R-06/065F | |||||||||||||||||||||||||||||||
Stock Number | PB2008-104486 | |||||||||||||||||||||||||||||||
OCLC Number | 457980468 | |||||||||||||||||||||||||||||||
Subjects | Water--Pollution--Environmental aspects--Maine ; Watersheds--Maine | |||||||||||||||||||||||||||||||
Additional Subjects | Water pollution ; Watersheds ; Biological effects ; Maine ; Dissolved oxygen ; Water quality ; Temperature ; Case studies ; Land use ; Urban areas ; Resource management ; Toxicity ; Brook trout ; Macroinvertebrates ; Plecoptera ; Ephemeroptera | |||||||||||||||||||||||||||||||
Internet Access | ||||||||||||||||||||||||||||||||
Holdings |
|
|||||||||||||||||||||||||||||||
Collation | xii, 138, [80] p. : col. ill., charts, maps ; 28 cm. | |||||||||||||||||||||||||||||||
Abstract | This case study presents results from a complex causal assessment of a biologically impaired, urbanized coastal watershed located primarily in South Portland, Maine, USAthe Long Creek watershed. This assessment serves as an example implementation of U.S. Environmental Protection Agency Stressor Identification guidance. Four specific biological effects defining impairment and seven candidate causes of impairment were chosen and evaluated at three impaired sites along Long Creek. Biological effects include (1) decreased Ephemeroptera, Plecoptera, and Trichoptera (EPT) generic richness, (2) increased percent non-insect taxa individuals relative to total macroinvertebrate abundance, (3) increased Hilsenhoff Biotic Index (HBI) score, and (4) brook trout absence. Decreased dissolved oxygen, altered flow regime, decreased large woody debris, increased temperature, and increased toxicity due to ionic strength were identified as probable causes of impairment. The implications associated with interactions among probable causes are discussed in terms of this case study and causal assessment in general. |
|||||||||||||||||||||||||||||||
Notes | "December 2007". "EPA/600/R-06/065F". Includes bibliographical references. |
|||||||||||||||||||||||||||||||
Contents Notes | "This case study presents results from a complex causal assessment of a biologically impaired, urbanized coastal watershed located primarily in South Portland, Maine, USA the Long Creek watershed. This assessment serves as an example implementation of U.S. Environmental Protection Agency Stressor Identification guidance. Four specific biological effects defining impairment and seven candidate causes of impairment were chosen and evaluated at three impaired sites along Long Creek. Biological effects include (1) decreased Ephemeroptera, Plecoptera, and Trichoptera (EPT) generic richness, (2) increased percent non-insect taxa individuals relative to total macroinvertebrate abundance, (3) increased Hilsenhoff Biotic Index (HBI) score, and (4) brook trout absence. Decreased dissolved oxygen, altered flow regime, decreased large woody debris, increased temperature, and increased toxicity due to ionic strength were identified as probable causes of impairment. The implications associated with interactions among probable causes are discussed in terms of this case study and causal assessment in general."--Abstract. |