00000nam 2200000zi 4500 9.870329 CaOODSP 20241203113647 m o d f cr ||||||||||| 190321s1999 onc #ot f|0| 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-on En13-5/99-263E-PDF Murphy, Thomas P. D. author. (Thomas Patrick Daniel), 1948- Biogeochemical study of an avian botulism outbreak / by T. Murphy [and five others]. [Burlington, Ontario] : Environment Canada, Water Science and Technology Directorate = Environnement Canada, Direction générale des sciences et de la technologie, eau, [1999] 1 online resource (21 pages) : figures, map. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 99-263 Digitized edition from print [produced by Environment and Climate Change Canada]. Title from cover. Includes bibliographical references. "This presentation was a review of our research on algal toxins. The weight of evidence is tightening the linkage between the presence of microcystins and the initiation of botulism. However, the specific pathway is uncertain. For example, algal toxins might kill small animals that become the substrate for Clostridium which then kills birds. Our ongoing indicate that if the algal toxin kills birds directly, it must be initially protected from digestive juices perhaps by bioaccumulation into duck food. The other focus of this study was to resolve why certain areas of the lake were much more toxic. Ongoing studies indicate that hotspots are set up by wind and appear to involve release of an essential nutrient, not phosphorus from sediments"--Manuscript perspective. Includes abstract in French. gccst Lakes gccst Sediments gccst Water pollution Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; 99-263. (CaOODSP)9.844121 PDF 1.39 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-99-263-eng.pdf