Skip Links

USGS - science for a changing world

Open-File Report 2006-1307

National Wetlands Research Center

Bioindicators from Mosquitofish (Gambusia affinis) Sampled from the Imperial Valley in Southern California

By Jill A. Jenkins and Rassa O. Draugelis-Dale

thumbnail of and link to report PDF (4 MB)Download Publication
Open-File Report
PDF (4 MB)
Right-Click to 'Download' or 'Save As'

The Sonny Bono Salton Sea National Wildlife Refuge (SSNWR) is located 64 km north of the Mexican border at the southern end of the Salton Sea in California’s Imperial Valley. Freshwater ponds and managed habitats at the SSNWR, Calipatria, Calif. are supplied with Colorado River water that carries compounds from upstream sources. Components include municipal and industrial discharges, agricultural drainage, and sewage plant inputs. Aquatic animals in these ecosystems are continuously exposed to multiple constituents, several of which have been demonstrated to be associated with hormonal disturbances. We investigated possible endocrine impacts to fish in the Imperial Valley, Calif., by addressing the null hypothesis that aquatic species in impacted sites did not exhibit evidence of endocrine disruption as compared with those from nonimpacted sites. The results presented are intended to provide managers with science-based information and interpretations about the condition of the animals in their ecosystems for the minimization of potential adverse effects to trust fish and wildlife resources and for the maximization of available water resources.

Version 1.0

Posted February 2007

Suggested citation:
Jenkins, J.A., Draugelis-Dale, R., 2006, Bioindicators from mosquitofish (Gambusia affinis) sampled from the Imperial Valley in southern California: U.S. Geological Survey Open-File Report 2006-1307, 48 p.

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to for free tools that allow visually impaired users to read PDF files.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
URL: http:// /of/2006/1307/index.html
Page Contact Information: Contact USGS
Page Last Modified: Saturday, 12-Jan-2013 22:25:15 EST