00000nam 2200000zi 4500 9.878538 CaOODSP 20241203113651 m o d f cr bn||||||||| 190826s1993 onca ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-on En13-5/93-50E-PDF Sherry, J. P., author. Effects of 2,4-dichlorophenoxyacetic acid on freshwater ponds : fungal propagules / J. Sherry. Burlington, Ontario : Research and Applications Branch, National Water Research Institute, [1993] 1 online resource (4 unnumbered pages, 21 pages, 9 unnumbered pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 93-50 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 14-18). "The effect of treatments with 2,4-dichlorophenoxyacetic acid (2,4-D) on fungal propagules in man-made freshwater ponds was studied as part of a larger investigation into the effects of the herbicide on the ponds' ecology and chemistry. Myriophyllum spicatum was planted in the ponds as a target plant; the ponds were allowed to stabilize before being treated with djmethylamine (DMA) and butoxyethylester (BEE) derivatives of 2,4-D (1 mg/L). The treatments did not have a clear effect on propagule levels in either the water column or sediment, which indicates the absence of a primary effect. The mean levels of moulds and "total fungi" in both sets of treated ponds, and of yeasts in the DMA treated ponds tended to be depressed relative to the control ponds over the first 114 days after treatment. That observation was reinforced by plots of the accumulated differences between the treated and control ponds. The mean differences between the control and treated ponds were highly variable, however. The degree of replication did not permit a statistical test of those differences. If real, the trends were probably a result of unidentified secondary effects of the pond treatments. The results imply that applications of 2,4-D to aquatic vegetation at realistic rates do not drastically affect fungi in the water column or sediment"--Abstract. Includes summaries and abstracts in English and French. gccst Herbicides gccst Fungi Canada. Environment Canada. National Water Research Institute (Canada). Research and Applications Branch. NWRI contribution ; 93-50. (CaOODSP)9.844121 PDF 2.46 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-93-50-eng.pdf