Catalog Record: AVA-AK: Unalaska Vegetation Plots (Talbot et al. 2010)
Filename: unalaska.geojson




Aava unalaska stalbot 2010 sitephoto
Aava unalaska stalbot 2010 map anc
Aava unalaska stalbot 2010 cover metadata

AVA-AK: Unalaska Vegetation Plots (Talbot et al. 2010)

Arctic Vegetation Archive - Alaska: Unalaska Vegetation Plots.

In 2007, one of the first quantitative studies of vegetation from sea level to alpine on Unalaska Island in the Aleutian Islands was completed (Talbot et al. 2010). The focus of the study was to 1) describe the major plant communities along environmental gradients, 2) identify the main vegetation types and communities and determine their relationship to select site factors, and 3) compare these communities to other studies completed in southern Alaska. A combined Braun-Blanquet and multivariate analysis approach was applied to the data for the 70 plots and showed a complex gradient primarily influenced by soil moisture, elevation and pH. Funding for this project came from the U.S. Fish and Wildlife Service.

Cover-abundance was estimated for all vascular plants, bryophyte, and macrolichens using the nine-point original scale of Westhoff and van der Maarel (1973) in sixty-nine subjectively chosen plots on Unalaska Island and one plot on Amaknak Island. Eleven plant communities in six broad ecological groups were identified in this study. These plant communities occur in 6 broad habitat types including: 1) Dry coastal beach and sand dune vegetation (9 plots), 2) Willow, grass, fern, forb thickets (4 plots), 3) Wet acidic sedge, forb mire (9 plots), 4) Late snowbed communities (3 plots), 5) Moist and dry acidic dwarf-shrub and lichen heaths (Vaccinium uliginosum, Empetrum nigrum, Ledum decumbens, Spiraea beauverdiana, and Betula nana-lichen heaths (22 plots), and 6) Alder communities (23 plots).

Plots were 25 square meters (5 by 5 m) in area and environmental data collected include elevation, litter cover, slope inclination, ecological moisture regime, and mesotopography. Plots were not permanently marked but GPS locations in degrees, minutes, seconds were recorded. A single soil sample was collected from each plot and brought back to the lab for chemical assessment.

A summary of these data is presented in the publication listed below.


Talbot, S. S., W. B. Schofield, S. L. Talbot, and F. J. A. Daniels. 2010. Vegetation of eastern Unalaska Island, Aleutian Islands, Alaska. Botany 88:366-388.


Data and Resources

  • Download

    Download :: Unalaska Readme

    aava_unalaska_stalbot_2010_readme_metadata.pdf (23.3 KB)

  • Download

    Download :: Unalaska Data: species and environmental (source and Turboveg), map, publication, soil (chemical), and metadata

    unalaska_stalbot_2010_alldata.zip (2.55 MB)

  • View metadata
    Metadata :: Current AAVA Turboveg Data Dictionary and Panarctic Species List (PASL) and link to download Turboveg for Windows


Status: Complete
Start Date: 2007/08/03
Type: Data
End Date: 2007/08/22
Data Types: Database, Map, Report
Primary Contacts
Name: Stephen Talbot
Other Contacts
Name: Alaska Geobotany Center (AGC)
Email: uaf-agc@alaska.edu
Primary Organizations
Alaska Geobotany Center

Funding Organization
US Fish & Wildlife Service


All Vegetation Plot Data
Aleutian Islands

Direct Record Link
Direct Full Map Link