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Pacific Southwest Research Station
800 Buchanan Street
Albany, CA 94710-0011
Tahoe Science Projects supported by SNPLMA
Emerald Bay control and management: stressors and mechanisms controlling Asian clam populations in Emerald Bay
Final Report [pdf]
The Asian clam (Corbicula fluminea) is identified as an aquatic invasive species that is well established in Lake Tahoe. First recorded in Lake Tahoe in 2002, Asian clam densities of up to 5,000 individuals-m-2 have since been reported, and its range has expanded substantially throughout much of the Lake’s southeastern area. The Asian clam often dominates the benthos where it occurs in Lake Tahoe. It is associated, but not necessarily the cause of, filamentous algal blooms, and deposition of clam shells in the nearshore is considered a degradation of aesthetic conditions in Lake Tahoe.
Emerald Bay is a special management area, and there is strong interest from resource and regulatory agencies in preserving its natural character. The clam population discovered in 2009 was considered localized in extent, and of low density; thus, it was thought to have the potential for treatment in its entirety. However, the special designations of Lake Tahoe and Emerald Bay limit the methods available to control clam populations to mechanical treatments. In 2010, Agency personnel decided to pursue a large-scale clam control project in Emerald Bay using benthic barriers supplemented with organic material. Implementation of this project occurred between 2012 and 2014.
Benthic barrier and organic material deployment (and in-progress redeployment) to treat the Asian clam population in Emerald Bay occurred under the direction of agency personnel. Science investigations associated with benthic barrier deployment occurred under the direction of University of California, Davis, and University of Nevada, Reno personnel, and focused on:
This document presents key findings from the investigations described in Appendixes A and B, with the aim of answering the question of how to optimize the effectiveness of benthic barriers to treat the Asian clam population in Emerald Bay.
|Last Modified: Jul 27, 2016 03:56:38 PM|