Density Estimates from Point Count Sampling (individuals per hectare)
Dates
Start Date
2008-07-01
End Date
2012-09-15
Summary
Density estimates of four mammal species in the upper subalpine and alpine zones of the Sierra Nevada range, 2008 - 2012. The estimates were derived from variable distance data collected 3-4 times per year at point count stations randomly located along line transects. There were 21 transects (10 km in length) that had been randomly selected from a pool of 53 potential routes, with 10 point count stations along each transect (minimum of 200 m spacing between stations). 45 stations were sampled in 2008 (5 stations on each of 9 transects), 60 stations were sampled in 2009 (5 stations on each of 12 transects),190 stations were sampled in 2010 (10 stations on each of 19 transects), 210 stations were sampled in 2011 (10 stations on each [...]
Summary
Density estimates of four mammal species in the upper subalpine and alpine zones of the Sierra Nevada range, 2008 - 2012. The estimates were derived from variable distance data collected 3-4 times per year at point count stations randomly located along line transects. There were 21 transects (10 km in length) that had been randomly selected from a pool of 53 potential routes, with 10 point count stations along each transect (minimum of 200 m spacing between stations). 45 stations were sampled in 2008 (5 stations on each of 9 transects), 60 stations were sampled in 2009 (5 stations on each of 12 transects),190 stations were sampled in 2010 (10 stations on each of 19 transects), 210 stations were sampled in 2011 (10 stations on each of 19 transects), and 170 stations were sampled in 2012 (10 stations on each of 17 transects). All counts were done in July and August each year. Replicate samples within a given year were done within 2-8 days of each other. All counts were done by single observers. The spreadsheet has eight worksheets, including five with density estimates for each species at different scales, one worksheet with definitions of the fields, one worksheet with the species names, and a worksheet that defines the scale and units of the estimates in the five worksheets for density
Click on title to download individual files attached to this item.
AllSpecies0812SNVPtsDensity_xls.xml Original FGDC Metadata
View
8.44 KB
application/fgdc+xml
AllSpecies0812SNVPtsDensity.xls
613.5 KB
application/vnd.ms-excel
Purpose
The data are being used in a number of ways. The five main ones include: 1. Evaluation of spatio-temporal patterns of abundance and occupancy 2. Evaluation of relationships of abundance with climatic, topographic, and land cover variables 3. Quantifying the niches of the four species 4. Model patterns of abundance and occupancy throughout the range 5. Evaluate spatio-temporal habitat use and selection patterns for the species individually and as an assemblage
Communities
National CASC
National and Regional Climate Adaptation Science Centers
