Water-Quality and Fish-Community Data for the Niobrara National Scenic River, Nebraska, 2003-05

Dietsch, Benjamin J.

doi:10.3133/fs20073098

Cited by 2 publications

(2 citation statements)

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“…A study by the U.S. Geological Survey [26] found substantial amounts of pesticides, including atrazine and metolachlor, in water samples collected from the Elkhorn and Platte rivers, while pesticide levels in the Dismal River were considered negligible. Pesticide concentrations have also been measured in water samples collected from the Niobrara River [27]. Of the 65 pesticides measured, only 4 were detected (including atrazine and metolachlor) and each was found at trace concentrations.…”

Section: Pocissmentioning

confidence: 99%

Agrichemicals in nebraska, USA, watersheds: Occurrence and endocrine effects

Sellin

Snow

Schwarz

et al. 2009

Enviro Toxic and Chemistry

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The objective of the present study was to determine the occurrence and endocrine effects of agrichemicals in four Nebraska, USA, watersheds--the Elkhorn, Platte, Niobrara, and Dismal rivers. Land use in the Elkhorn River and Platte River watersheds is characterized by intense agriculture, including row crop and beef cattle production. In contrast, land within the Niobrara River and Dismal River watersheds consists primarily of grasslands. Polar organic chemical integrative samplers (POCIS) and caged fathead minnows were deployed at a site within each watershed for 7 d. The POCIS were analyzed for pesticides and hormones, while the caged minnows were analyzed for the expression of estrogen- and androgen-responsive genes. Amounts of pesticides recovered in POCIS extracts from the Elkhorn and Platte rivers were higher than those recovered from the Niobrara and Dismal rivers. Furthermore, female minnows deployed in the Elkhorn River experienced significant reductions in expression of two estrogen-responsive genes (vitellogenin and estrogen receptor α) relative to females deployed at the other sites, indicating alterations in endocrine function. However, the defeminization of these females could not be definitely linked to any of the agrichemicals detected in the POCIS recovered from the Elkhorn River.

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Section: Pocissmentioning

confidence: 99%

Agrichemicals in nebraska, USA, watersheds: Occurrence and endocrine effects

Sellin

Snow

Schwarz

et al. 2009

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

show abstract

“…For example, an area of the channel with depth less than 1 ft and velocity between 1 and 2 ft per second would be classified as "shallow-moderate." Although the hydraulic habitat niches originally were defined for fish species of the Platte River (Peters and Holland, 1992), many of the same fish species have been sampled in the main channel and tributaries of the Niobrara National Scenic River (Dietsch, 2007).…”

Section: Hydraulic Habitat At a Streamflow-gaging Stationmentioning

confidence: 99%