00000nam 2200000zi 4500 9.873237 CaOODSP 20241203113648 m o d f cr ||||||||||| 190517s1989 oncbd #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre nl----- En13-5/89-02E-PDF Reynoldson, Trefor B., author. Development of a benthic invertebrate objective for mesotrophic Great Lakes / Trefor B. Reynoldson, D.W. Schloesser and B.A. Manny. Burlington, Ontario, Canada : National Water Research Institute, Lakes Research Branch, Canada Centre for Inland Waters, [1989] 1 online resource (29 unnumbered pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 89-02 Title from cover. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "The desirable characteristics of a biological indicator of mesotrophic conditions are: that it should provide an appropriate and interpretable endpoint; that it should be achievable if corrective measure are taken, that is it should be within the environmental continuum; and that progress towards the objective can be measured. Historical data bases from the Great Lakes suggest that Hexagenia limbata, provides an appropriate endpoint, that the tubificid oligochaete community can be used to determine recovery, and data from other systems shows that Hexagenia can return to locations where it was formerly abundant"--Abstract. Includes abstract, management perspective and executive summary in English and French. gccst Environmental indicators gccst Lakes Hexagenia limbata Schloesser, Donald W., author. Manny, Bruce A., author. Canada. Environment Canada. National Water Research Institute (Canada). Lakes Research Branch. Canada Centre for Inland Waters. NWRI contribution ; 89-02. (CaOODSP)9.844121 PDF 1.88 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-89-02-eng.pdf