We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleLong-Term Variability in Bioassessments: A Twenty-Year Study from Two Northern California StreamsAuthorsMazor, Raphael; Purcell, Alison; Resh, VincentPublicationEnvironmental Management, 2009, Vol 43, Issue 6, p1269ISSN0364-152xPublication typearticleDOI10.1007/s00267-009-9294-8