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Overview
Basics
Basics
Curly-leaf pondweed (Potamogenton crispus) is a relatively recent example of a nearshore aquatic invasive species in LT. Due to its recent introduction, and restricted range in the southern portion of LT, curly-leaf pondweed is considered to be in an early invasion stage and thus could be a potential candidate for eradication or control if a feasible methodology can be found.
The goal of this research was to study turions produced by curly-leaf pondweed to determine their relationship to plant biomass and assess their susceptibility to non-chemical treatment using gas permeable and impermeable benthic bottom barriers.
Completed
2010
2011
2013
$125,800
Patricia Maloney (pemaloney@ucdavis.edu)
10/27/2017
10/27/2017
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| Location Information | Location Notes |
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Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0096 - P069: Potential for Pondweed Control in Lake Tahoe Using Bottom Barriers
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
$125,800
$125,800
$0
| Total | |||
|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacific Southwest Research Station) (USFS - PSW) | $125,800 | $125,800 | $0 |
| Grand Total | $125,800 | $125,800 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2013 | 2012 | 2011 | 2010 | |
|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $125,800 | $31,450 | $31,450 | $31,450 | $31,450 |
| Grand Total | $125,800 | $31,450 | $31,450 | $31,450 | $31,450 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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In? order? to? control? or? eradicate? Lake? Tahoe’s? established? aquatic? invasive? species,? it? is? necessary? to? understand? the? species-specific? ecology? combined? with? novel? applications? of? effective? low? cost? non- chemical ?treatments ?to? prevent ?population? growth.?
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
| 08/14/2017 3:31 PM | Kiara Cuerpo-Hadsall | Objectives: • Profile five sites around the South Shore of Lake Tahoe with existing curlyleaf pondweed populations. • Select three of the profiled sites to deploy three types of bottom barriers over adult curly-leaf pondweed populations and turions to determine the impact of anoxia. |
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| 08/14/2017 3:30 PM | Kiara Cuerpo-Hadsall | Findings: • As hypothesized in the literature,while a standing condition of anoxia in a water body may be an important mechanism inhibiting sprouting of turions and growth of curly-leaf pondweed, this appears to be fundamentally different than establishing a temporary condition of anoxia for the purpose of inhibiting turion sprouting. • Since turions are produced each year, bottom barriers would have to be installed annually, and then with only a 20-30 percent reduction in sprouting (i.e. incomplete control/management). • We did not find evidence to suggest that once the barriers were removed that in situ turion germination would not occur in the treated plots, provided the appropriate environmental conditions were present. • Bottom barriers have been used to control plant growth and biomass in Emerald Bay; however, since these barriers affect photosynthesis by blocking light, a distinction between material that are porous or non-porous to dissolved oxygen is not an issue. • In contrast the use of nonporous material is essential if the objective is to inhibit turion sprouting. |
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| 08/14/2017 3:29 PM | Kiara Cuerpo-Hadsall | Management Implications: • Based on our experiments we see no reason to recommend the large-scale application of non-porous bottom barriers for managing existing curly-leaf pondweed populations in Lake Tahoe that employs control of turion sprouting as a primary mechanism. • In reference to aquatic macrophyte control applied to infested waterbodies in general, previous studies concluded that benthic bottom barriers alone cannot eradicate 100 percent of the turions on their own, but that non-porous benthic bottom barriers could possibly be used in conjunction with other integrated methods for eradication of Potamogeton crispus turions. Such combined treatments may be able to selectively take advantage of the anoxic conditions that will enhance efficacy. This study does not recommend the use herbicide or other toxics for treatment of curly-leaf pondweed in the open waters of Lake Tahoe. Rather, we provide comments on ‘combined treatments’ to inform future discussions on this matter should the need arise. |
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| 08/14/2017 3:29 PM | Kiara Cuerpo-Hadsall | Publications: www.fs.fed.us/PSW/partnerships/tahoescience Allison Gamble, Thomas Barr, Brant Allen, Katie Webb, John Reuter, Marion Wittmann, Sudeep Chandra, and Geoff Schladow, Potential for Pondweed Control in Lake Tahoe using Bottom Barriers, June 2013. |