35 research outputs found
DISCUSSION OF "Ground-Water Computer Models," by Thomas A. Prickett, Russell E. Darr, and Henry A. Baski, March-April 1979 issue, v. 17, no. 2, pp. 167-182
Migration of Chlorophenolic Compounds at the Chemical Waste Disposal Site at Alkali Lake, Oregon - 2. Contaminant Distributions, Transport, and Retardation
A NON-FICKIAN SURFACE EXCESS MODEL FOR CHEMICAL TRANSPORT THROUGH FRACTURED POROUS MEDIA
Effects of Rotenone on Columbia Spotted Frogs Rana luteiventris during Field Applications in Lentic Habitats of Southwestern Montana
Fisheries managers are restoring native populations by removing nonnative fishes worldwide. Increasingly, the
piscicide rotenone is used to accomplish this. Fish introductions and removals change the aquatic environment, and
it is important to consider the impacts of these actions on nontarget species, including amphibians. Laboratory
experiments have shown that rotenone can negatively affect tadpoles. We therefore assessed the effects of rotenone
used on two wild amphibian populations. The commercial piscicide formulation CFT Legumine (5% rotenone) was
applied at 1 mg/L (50 μg/L rotenone) to a lake containing nonnative trout in Yellowstone National Park (YNP) in 2006
and two fishless wetlands on private lands in southwestern Montana in 2008. Amphibian surveys were conducted
immediately prior to and after the rotenone treatments to obtain tadpole population estimates. Follow-up surveys
were conducted 1 year posttreatment to estimate tadpole recovery. In YNP, additional surveys were conducted 2
and 3 years postapplication to observe longer-term effects of fish removal and the subsequent introduction of native
fish. Within 24 h following application of rotenone, there was 100% mortality in gill-breathing tadpoles, but nongillbreathingmetamorphs,
juveniles, and adults were apparently unaffected. In the years following, tadpoles repopulated
all waters and population levels were similar to, or, in the case of YNP because of concurrent fish removal, higher
than pretreatment levels. In YNP, tadpole abundance and distribution decreased after westslope cutthroat trout
Oncorhynchus clarkii lewisi were stocked in the treated lake