[Personnel: Last_Name='STEVENS', Middle_Name='B.', First_Name='TYLER']
A New Approach for Analyzing Bird Densitiies from Variable Circular-plot CountsEntry ID: brdpier0003
Abstract: An approach for calculating bird densities from variable circular-plot
is described. The approach differs from previous methods in that data from
several surveys are pooled and detection distances are adjusted as if all
distances were recorded by a single observer under a given set of field
conditions. Adjustments for covariates that affect detection distances such as
observer, weather, ... time of day, and vegetation type are made using coefficients
calculated by multiple linear regression. The effective area surveyed under
standard conditions is calculated from the pooled data set and then used to
determine the effective area surveyed at each sampling station under the actual
conditions when the station was sampled. The method was validated in two field
studies where the density of birds could be determined by independent methods.
Computer software for entering and analyzing data by this method is described.
Keauhou Ranch on the Island of Hawaii, mamane forest at Kanakaleonui, on the
eastern slope of Mauna Kea 1.5.2 Bounding Rectangle Coordinates
Density estimates calculated by the method described in the paper were
compared, to reasonably accurate density estimates derived by independent
methods for two study areas. In the first study area at Keauhou Ranch, 55
surveys using the VCP method with 8 min counts were conducted beginning in July
1977. Surveys were usually conducted three times each month at 25 stations
placed at 100-m intervals (Ralph and Fancy 1994). As a result of more than
62,000 net hours of banding effort and weekly searches of birds banded with
colored bands on a 16-ha gridded study site, the majority of resident
individuals were banded and closely monitored during the study.
Purpose: To calculate bird densities from variable circular-plot counts.
Data Set Citation
Dataset Originator/Creator: Steven G. Fancy
Dataset Title: A new approach for analyzing bird densities from variable circular-plot counts
Dataset Release Date: 1997
Dataset Release Place: Hawaii
Dataset Publisher: USGS, Pacific Island Ecosystems Research Center, Hawaii Field StationOnline Resource: https://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/3100/v...
BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS > FORESTS
BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS > ISLANDS
BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > BIRDS
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > RANGE CHANGES
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS
ISO Topic Category
Access Constraints None
Use Constraints None
Data Set Progress
Role: TECHNICAL CONTACT
Phone: (970) 225-3571
Email: steve_fancy at nps.gov
National Park Service Natural Resource Information Division 1201 Oak Ridge Drive, Suite 150
City: Fort Collins
Province or State: CO
Postal Code: 80525-5589
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Steven G. Fancy. 1997. A new approach for analyzing bird densities from
variable circular-plot counts, Pacific Science, 51(1), University of Hawaii
Press, Hawaii, pp. 107-114.
C. John Ralph and Steven G. Fancy. 1994. Demography and movements of the
endangered Akepa and Hawaii Creeper, Willson Bull., 106(4), pp. 615-628.
Steven G. Fancy, Thomas J. Snetsinger and James D. Jacobi. 1997. Translocation of the Palila, an endangered honeycreeper, Pacific Conservation Biology, 3, Surrey Beatty & Sons, Sydney, Australia, pp. 39-46.
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Creation and Review Dates
Last DIF Revision Date: 2016-11-18