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A study of the effects of Toxaphene on the bottom fauna of Paul Lake, British Columbia

The density of the animals forming the bottom fauna of Paul Lake, British Columbia has been estimated for two successive seasons, based on 250 Ekman dredge samples from all zones for each year. After the sampling of the first year, the lake was treated with .004 p.p.m. Toxaphene. Density changes in the invertebrate population were considered on the basis of increase, decrease and changes in zonal distribution.
Following poisoning and elimination of predatory fish, density increases occurred in the Physidae, Lymnae-idae, Oligochaeta, Planoribae, and Hirudinea. Density decreases occurred in the Watermites, Amphipods, Chiron-omidae, Planaria, Sphaeriidae and Odonata. Tricoptera, Ephemeroptera and Ceratopogonidae were not taken in any of the samples after poisoning. / Science, Faculty of / Zoology, Department of / Graduate

Identiferoai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/36822
Date January 1965
CreatorsEllickson, Peter Joseph
PublisherUniversity of British Columbia
Source SetsUniversity of British Columbia
LanguageEnglish
Detected LanguageEnglish
TypeText, Thesis/Dissertation
RightsFor non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

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