Report Number: 24892
Permit Number: CRLA-2002-SCI-0004
Current Status: Checked in
Date Received: Apr 10, 2003
Reporting Year:
2002
Principal Investigator:
Dr Lawrence Powers,
Department of Natural Sciences,
Oregon Institute of Technology,
Klamath Falls, OR
Additional investigator(s):
Alan Buehrig, Alisha
Simonson, Shawna Nieraeth
Park-assigned Study Id. #
CRLA-00003
Permit Expiration Date:
Sep 30, 2002
Permit Start Date:
Jun 01, 2002
Study Starting Date:
Jun 01, 2002
Study Ending Date:
Sep 30, 2002
Study Status:
Completed
Activity Type:
Education
Subject/Discipline:
Birds / Ornithology
Objectives:
Characterize types of aggressive
displays in and between corvid species of birds (Clark's Nutcrackers, Stellar's
Jays, Gray Jays and Scrub Jays) at different elevations in the Klamath Basin and
adjoining Cascades Mountains, including sites within Crater Lake National Park.
Use ethological observations at potential interaction sites to characterize
behaviors. Characterize, if possible, habitat sites and elevation zones for the
four species.
Findings and Status: Crater Lake
National Park was one of several sites used in the Klamath basin to observe
territorial interactions among four corvid species of birds. Within the park,
observation sites included 1) Annie Creek picnic area near south entrance to
park; 2) Annie Creek picnic area 3 miles inside park; 3) area north of Annie
Creek Bridge; 4) Goodbye Picnic Area; 5) Godfrey Glen Trail parking area; 6)
CLNP headquarters area; 7) pumice field halfway up road to Rim Drive; 8) Steel
Bay overlook on West Rim Road; 9) Northeast Rim Road; 10) Cloudcap Overlook
area; 11) 2 miles north of Pinnacles Road on East Rim Drive; 12) rock quarry on
Sand Creek Fire Road; and 13) Flower Garden parking area. GPS coordinates and
times of observation are available for each of these sites.
Four observers remained in each of these
areas for 30 minutes to observe corvids. if no corvids were seen or heard, no
further observations for that site were made. In general, nutcrackers were
observed primarily at the Rim drive sites, with the exception of the Park
Headquarters. Gray Jays were seen at most sites, including the lower elevations
at the South Entrance and along the rim. Stellar's Jays were observed primarily
at Park Headquarters and roadside areas near Godfrey Glen and the Goodbye Picnic
area. No scrub jays were observed at CLNP by our team, although they do occur in
the park, particularly in the open lower elevation habitats. Another corvid, the
Common Raven, was also observed in picnic areas, near Park Headquarters, and in
parking areas along the rim. As was expected, bird densities were highest and
birds were most active near picnic sites. All corvid species are attracted to
activities that include food. Gray Jays, as noted many times by others, were
particularly aggressive and we fed a few of them by hand at the Annie Creek
picnic area near the South Entrance.
Interactions between species were not
directly observed. Several species overlapped at some sites (especially the Park
headquarters area), but we did not observe aggressive encounters between
species. We did observe some aggressive interactions between Stellar's Jays in
the Goodbye Picnic Area.
This study was done to educate a small group
of undergraduate students at the Oregon Institute of Technology on some field
techniques for ethological observation and to demonstrate zonation amongst
related species of birds. It also served as a preliminary (pilot) study for
potential longer term research on corvid territoriality and for use in biology
field trips taught by the principal investigator. The findings were of a
preliminary observational nature and were not intended for publication or to add
to specific knowledge of bird ethology. The studies and observations did
indicate, however, some of the problems and possible approaches to conducting
this type of study at CLNP.
For this study, were one or
more specimens collected and removed from the park but not destroyed during
analyses?
No
Funding provided this
reporting year by NPS:
0
Funding provided this
reporting year by other sources:
0
Full name of college or
university: n/a
Annual funding provided by
NPS to university or college this reporting year: 0
