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Overview
Basics
Basics
Identify effects of ski resorts on marten populations by comparing population values within 3 pairs of treatment (ski resorts) and control areas (non-ski resorts).
Completed
2007
2008
2013
$446,671
Pat Manley (pmanley@fs.fed.us)
10/27/2017
10/27/2017
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| Location Information | Location Notes |
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Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0074 - P022: The Effect of Ski Resorts on Population Dynamics of the Pacific Marten in the Lake Tahoe Region of California and Nevada
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
$446,671
$446,671
$0
| Total | |||
|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacific Southwest Research Station) (USFS - PSW) | $446,671 | $446,671 | $0 |
| Grand Total | $446,671 | $446,671 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | |
|---|---|---|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $446,671 | $63,810 | $63,810 | $63,811 | $63,810 | $63,810 | $63,810 | $63,810 |
| Grand Total | $446,671 | $63,810 | $63,810 | $63,811 | $63,810 | $63,810 | $63,810 | $63,810 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
-
High-elevation conifer forests of the Sierra Nevada have historically provided some refuge from human impacts including trapping and timber harvest, but these forests have increasingly become focal areas for winter recreation. Because martens are active yearround and are most energetically stressed during winter, winter recreation has the potential to have significant negative impacts.
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 11:39 AM | Matt Driscoll | Match Funding: $ 223,200 | ||
| 07/27/2017 4:19 PM | Kiara Cuerpo-Hadsall | Objectives: The overall goal of this study was to determine whether ski resorts have a net negative, neutral, or positive effect on Pacific marten populations in the Lake Tahoe region. Specifically, we gathered information necessary to evaluate the influence of ski resorts on: • Loss and fragmentation of forest habitat; • Marten movement; • Marten seasonal occupancy and space use; • Marten abundance and survival; • Marten age structure and sex ratio; • Proportion of females that reproduce. |
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| 07/27/2017 4:19 PM | Kiara Cuerpo-Hadsall | Findings: • Martens were detected on all 6 study areas, with a total of 17 (13M:4F) individuals detected on the ski areas and 23 (14M:9F) on the control areas. While the number of male martens detected differed by only 1, the proportion of the stations used by male martens were lower at the resorts compared to the controls. More than twice the number of female martens were detected on controls (n = 9) versus ski areas (n = 4), yielding sex ratios (M:F) of 1.56 for controls versus 3.25 for ski areas. Females were detected at 62% more stations on controls than ski areas. • During the winter season we identified 36 used and 75 unused apparent marten movement paths between adjacent stations. Overall, martens showed highly significant selection (p = 0.0001) for movement paths with lower cumulative minimum ski run crossing distances. • The mean cumulative minimum ski run crossing distance at movement paths used by martens was 3-times lower, 17.5 m versus 54.8 m, than present at unused movement paths. There were no significant differences between the mean cumulative crossing distances between males and females during winter (p = 0.39) or between adult and sub-adult males (p = 0.87), adult and sub-adult females (p = 0.63), and adult males and females (p = 0.97). *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings. |
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| 07/27/2017 4:18 PM | Kiara Cuerpo-Hadsall | Management Implications: The overall results of our study suggest that winter ski recreation at developed ski areas may be compatible with the maintenance of marten populations in the Lake Tahoe region of the Sierra Nevada. However, ski area development and winter ski recreation activities do have negative, sex-specific effects on martens. Our results suggest that marten conservation within ski areas will be best achieved by considering the following suggestions: • Maintain reproductive habitat and its use by adult female martens. • Maintain or enhance habitat connectivity within ski operations areas. • Maintain or enhance the proportion of ski run crossings < 20m between non-reproductive habitat patches that are >10 ha and the operations areas boundary. Where smaller patches function as potential ‘stepping-stones’ between patches >10 ha and/or the operations boundary, maintain or enhance the proportions of ski run crossings that are < 20m. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional management implications. |