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U.S. GEOLOGICAL SURVEY
Data Series 286

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Acknowledgments

This study was funded by the U.S. Geological Survey and supported with in-kind services from the National Park Service, Bureau of Reclamation, U.S. Fish and Wildlife Service and the Nevada Department of Wildlife. The USGS Texas Cooperative Fish and Wildlife Research Unit is jointly supported by the U.S. Geological Survey, Texas Tech University, Texas Parks and Wildlife, U.S. Fish and Wildlife Service, and the Wildlife Management Institute. Specific assistance for electroshocking fish was provided by Jim Heinrich of Nevada Department of Wildlife. Tim Gross and technicians Carla Weiser, Shane Ruessler, and John Wiebe from the U.S. Geological Survey, Florida Integrated Science Center in Gainesville, Fla., provided substantial help planning the study, organizing trips, purchasing equipment and field assistance. Bill Burke and Bryan Moore of the National Park Service helped with field sampling, permits, and reconnaissance. Ken Covay of the U.S. Geological Survey, provided excellent assistance in all field sampling and shipping samples. Many helped analyzing samples in the laboratory including Melody Wainscott and Catherine Barry for fecundity, histology, and follicular diameter; Sonja Abney for analytical chemistry; Lita Hazlett for sperm quality; and Kevin Kroll for vitellogenin. Finally, we owe a debt of gratitude to Rachael Muir for her far sighted thinking to have the U.S. Geological Survey become involved in assessing endocrine disruption in aquatic resources in streams and rivers of the United States including Lake Mead.

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