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Overview
Basics
Basics
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.
Completed
2011
2012
2014
$320,867
Patricia Maloney (pemaloney@ucdavis.edu)
10/27/2017
10/27/2017
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| Location Information | Location Notes |
|---|---|
Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0100 - P087: Emerald Bay Control and Management: Stressors and Mechanisms Controlling Asian Clam Populations in Emerald Bay
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$320,867
$320,867
$0
| Total | |||
|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacific Southwest Research Station) (USFS - PSW) | $320,867 | $320,867 | $0 |
| Grand Total | $320,867 | $320,867 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2014 | 2013 | 2012 | 2011 | |
|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $320,867 | $80,217 | $80,217 | $80,217 | $80,216 |
| Grand Total | $320,867 | $80,217 | $80,217 | $80,217 | $80,216 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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he 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.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
No external links entered.
Notes
Notes
| 10/27/2017 2:24 PM | Matt Driscoll | Match Funding: $64,900 | ||
| 08/15/2017 8:30 AM | Kiara Cuerpo-Hadsall | Objectives: The proposed research will; • Assess whether the large-scale deployment of bottom barriers in Emerald Bay will depress or eliminate Asian clam populations; • Describe how dissolved oxygen (DO) and food supply drive the survival, depression or elimination of the Emerald Bay clam population under the barrier treatments. • Determine whether augmenting bottom barriers with organic carbon can further facilitate, depress, or eliminate the Emerald Bay clam population. Taken together, these data will help answer the key question of how to optimize the effectiveness of bottom barriers to treat the invasive Asian clam in Emerald Bay. |
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| 08/15/2017 8:29 AM | Kiara Cuerpo-Hadsall | Findings: • The sill in Emerald Bay is a dynamic and variable physical environment. Two-way water motion across the sill and through the sill is driven by baroclinic (water temperature) and barotropic (wind) forces. Water motion and substrate permeability affected both the integrity of the benthic barriers, and the ability to establish and maintain hypoxic conditions underneath the barriers. • Changes in nutrient concentrations underneath the benthic barriers were limited, and nutrient concentrations underneath the barriers rarely differed significantly from the ambient control. This is likely due to the low densities of benthic infauna (including Asian clams) occurring throughout the Emerald Bay sill. • We think the deployment of CurlexTM below the benthic barriers as an augmentation of organic material had little effect on in situ nutrient concentrations. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings. |
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| 08/15/2017 8:28 AM | Kiara Cuerpo-Hadsall | Management Implications: • The large scale deployment of gas impermeable benthic barriers in Emerald Bay, Lake Tahoe significantly reduced the density and caused significant mortality in the population of Asian clams. However, complete eradication from the area was not achieved and is highly improbable. • The data suggest that the stress caused from the benthic barriers forced clams to put less energy into reproduction and more into survival and metabolism. • The presence of benthic barriers did not affect the sediment carbon content. • These results suggest that gas impermeable barriers can be used to control for Asian clams, however many variables, such as upwelling, wave action, and temperature contribute to the success of these barriers. • It seems reasonable to expect that the future treatment of Asian clams in the sill area of Emerald Bay using benthic barriers would attain average clam mortality rates of between 45% and 70% during the summer period, with short-duration mortality rates exceeding 90%. Duration times of heightened mortality would likely increase with improved barrier integrity as discussed above. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional management implications. |
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| 08/15/2017 8:27 AM | Kiara Cuerpo-Hadsall | Publications: www.fs.fed.us/PSW/partnerships/tahoescience Paul R. Stumpner, Controls on Exchange Flow between Emerald Bay and Lake Tahoe, CA-NV. Masters Thesis, (Indiana University, Bloomington) 2004. Caldwell, T.J., Chandra, S., Beebe, B.A., Appendix A: Large scale deployment of gas impermeable benthic barriers to control invasive Asian clams in Emerald Bay, Lake Tahoe. Aquatic Ecosystems Analysis Laboratory, Department of Biology, University of Nevada – Reno, 2015. Zachary P. Hymanson, Katie J. Webb, Tom Mathis, and Alex Forrest, Principal Investigators: Allison Gamble, John Reuter, and Geoffrey Schladow, Appendix B: An Assessment of Physiochemical Conditions Associated with the Treatment of Asian Clams, (Corbicula fluminea) in Emerald Bay, Lake Tahoe, California. University of California Davis, Tahoe Environmental Research Center, July 31, 2015. |