00000nam 2200000zi 4500 9.872262 CaOODSP 20241203113648 m o d f cr ||||||||||| 190430e200609##oncd #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- En13-5/05-186E-PDF Schlechtriem, C., author. Effect of temperature on the fatty acid composition and temporal trajectories of fatty acids in starving Daphnia pulex (Crustacea, Cladocera) / C. Schlechtriem, M.T. Arts and I.D. Zellmer. Food chain effects of sublethal ultraviolet radiation on subarctic Daphnia pulex - a field and laboratory study Chronic effects of UV radiation on Daphnia pulex Burlington, Ontario, Canada : National Water Research Institute, Environment Canada, Canada Centre for Inland Waters, September 2006. 1 online resource (pages 515-531) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 05-186 Title from cover. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Poikilothermic organisms accumulate highly unsaturated fatty acids (HUFA) in their lipids at reduced temperatures to maintain cell membrane fluidity. In this study we investigated the effect of temperature on temporal trajectories of fatty acids of starving Daphnia pulex cultured on a HUFA-free diet. D. pulex populations were maintained for one month at 22°C and 11°C and were fed the chlorophyte Ankistrodesmus falcatus. We observed "trophic upgrading" of C18 fatty acid precursors to eicosapentaenoic acid (EPA; 20:5n3) and arachidonic acid (ARA; 20:4n6) in D. pulex. We showed that long term exposure to cold temperature causes a significant increase in EPA. HUFA such as ARA and EPA are highly conserved during starvation. Therefore, D. pulex has the biosynthetic capacity to adjust and to maintain the content of HUFA required to survive at low temperatures"--Abstract. Includes abstract and summary in English and French. gccst Ultraviolet radiation gccst Temperature Unsaturated fatty acids Arts, Michael Theodore, 1958- author. Zellmer, Iris D., author. Canada. Environment Canada. Canada Centre for Inland Waters. National Water Research Institute (Canada) NWRI contribution ; 05-186. (CaOODSP)9.844121 PDF 1.59 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-05-186-eng.pdf