Open-File Report 2012–1180
Executive SummaryPoor recruitment appears to limit the recovery of Lost River and shortnose sucker populations in Clear Lake Reservoir, California, but the cause is unknown. Adult suckers migrate up Willow Creek and its tributaries to spawn in some years, but low flow in Willow Creek may inhibit spawning migrations in other years. It is unclear whether spawning is successful, larvae survive, or juveniles persist to adulthood. Environmental variables associated with successful spawning or young-of-year survival have not been identified and early life history for these populations is poorly understood. The U.S. Geological Survey in cooperation with the U.S. Fish and Wildlife Service and Ruby Pipeline L.L.C. Corporation (El Paso, Tex.) initiated a study in 2011 to better understand juvenile sucker life history in Clear Lake Reservoir, and to identify constraints in the early life history that may limit recruitment to the adult spawning populations. This is a report on the 2011 pilot study for this project. |
First posted August 20, 2012 For additional information contact: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Burdick, S.M, and Rasmussen, J., 2012, Preliminary juvenile Lost River and shortnose sucker investigations in Clear Lake, California—2011 pilot study summary: U.S. Geological Survey Open-File Report 2012–1180, 18 p.
Executive Summary
Introduction
Study Area
Methods
Results
Implications for 2012 Field Study
Acknowledgments
References Cited