A Monitoring Program to Determine the Effect of Global Change on Alpine Plant Communities in the San Juan Mountains, SW Colorado
The Third Site in of the Global Observation Research Initiative in Alpine Environments (GLORIA) Program in North America
What is GLORIA and Why in the San Juan Mountains?
GLORIA is a long-term, global observation network for the comparative study of climate change impacts on mountain biodiversity, specifically plants. There are 42 GLORIA target regions worldwide, and nine are located in North America. GLORIA uses a multi-summit approach and standardized low-impact monitoring methodology, allowing the study of alpine plant communities and climate change impacts both within and among regions.
Ecosystems of the alpine life zone are considered to be particularly sensitive to global warming because they are adapted to low temperature conditions. Alpine communities are also limited in their migration ability to reach higher altitudes or latitudes due to the island nature of mountain tops. Alpine environments contain a relatively high number of endemic species (i.e., species that occur only locally) that risk extinction. A site in the San Juan Mountains is extremely useful in understanding alpine flora biodiversity, community patterns, and impacts of climate change, increasing air pollution, and spread of exotic plant species at a mid-latitude continental mountain range. In some areas of the San Juan Mountains, such as Silverton, temperatures have risen over one degree Celsius in the summer and four degrees Celsius in the winter since about 1970. It is crucial to understand how these increasing temperatures affect alpine tundra and treeline vegetation in this region.
What are the Benefits of the San Juan Mountain GLORIA Program?
- Establishment of a long-term observation system that can detect early warning signs of climate change and other stresses such as air pollution and exotic species invasions.
- Data on alpine plant communities that will aid in understanding changes to alpine biodiversity and spatial patterns in the San Juan Mountains and will allow comparison to mountain ranges throughout the world.
- Stewardship of alpine ecosystems.
- Education of undergraduate and graduate students.
What progress has been made?
Monitoring plots were installed and surveyed from July 29 to August 9, 2006 on four mountain summits on BLM public land near Lake City, Colorado. The summit elevations range from 12,195 to 13,800 ft. Temperatire dataloggers were dowloaded in summer 2008 and 2009. The plots are scheduled for monitoring every 5 years. The next monitoring phase will be in 2011.
An analysis of 2006 baseline data was completed by Julie Crawford for her PhD dissertation with the University of Pavia, Italy. Manuscripts are currently being prepared and submitted for publication in scientific journals.
MSI began planning the project more than a year prior to field work and several candidate locations were considered before picking the Lake City area. The project requires four summits along an elevation gradient beginning from just above treeline. The mountain tops have to be as conically-shaped as possible so that plots can be located on all four sides. Furthermore, geology and climate have to be very similar and peaks have to be as accessible as possible while avoiding areas impacted by recreation or mining.
The physical impacts associated with GLORIA projects are very minimal, by design. Each of the four summits is monitored using a specific observation protocol extending no farther than 10m below and 100m horizontal distance from a summit, with four main plots located at a specific distance below the summit in the primary cardinal directions. There are a total of 16 x 1 m2 temporary gridded quadrats (i.e., four in each plot). To facilitate repeat studies, small monument stakes (easily removed) or paint markers are installed to mark the summit origin point and the plot corners. The protocol also includes installation of a tiny, self-contained soil temperature monitoring sensor at a shallow depth inside each plot. The multi-summit array is observed at least once every five years with each summit requiring a team 2-3 full days to complete. Temperature sensors are downloaded every 2-3 years.
Marcie Demmy Bidwell, MSI; Dr. Julie Crawford
Thanks to our collaborators who helped on the project:
- Peggy Lyons – Botanist, Colorado Natural Heritage Program
- MSI staff & interns: Chris Peltz, Kyle Skaggs, Lindsey Lennek, Beth Adams, Michael Freer, Ellen Stein, and Michael Costello
- Dr. Michael Kelrick & his “Wilderness Conservation Biology” class from Truman State University.
Thanks to the project funders:
- 2011 Funds for Survey:
- Tres Rios Field Office of the Bureau of Land Management
- 2008-2009 funds for ongoing maitenance:
- San Juan Public Lands: USFS & BLM
- 2006 Funds for project initiation and baseline survey:
- San Juan Public Lands: USFS & BLM
- Mountain Studies Institute
- The Nature Conservancy of Colorado
- American Alpine Club
- Colorado Native Plant Society
- Colorado Mountain Club