Report Number: 35760
Reporting
Year: 2005
Permit Number: CRLA-2004-SCI-0007
Current Status: Checked in
Date Received: Mar 15, 2006
Principal Investigator:
Mr Andrew Duff,
Klamath Network Inventory and Monitoring
Program,
Ashland, OR
Additional investigator(s):
Daniel Sarr
(providing funding)
Park-assigned Study Id. # CRLA-04024
Permit Expiration
Date:
Dec 28, 2005
Permit Start Date:
Aug 01, 2004
Study Starting
Date:
Aug 01, 2004
Study Ending Date:
Dec 28, 2005
Study
Status:
Completed
Activity Type:
Inventory
Subject/Discipline:
Mammals
Objectives:
The objectives of this study were to: 1)
determine the diversity, relative abundance,
and activity of bats in CRLA, 2) determine
the distribution of bats in CRLA, 3) compare
acoustical and live capture techniques for
inventorying bats
Findings and Status:
At
CRLA, 119 bats representing 6 species were
captured in mist nets during 24 nights
(10,339 m2 net hours of netting effort).
Three species represented 68.1% of my mist
net captures: silver-haired bats (26.1%),
long-eared myotis (21.0%), and long-legged
myotis (21.0%). The remaining 31.9% of my
captures consisted of Yuma myotis (16.0%),
little brown myotis (11.8%), and big brown
bats (4.1%).
Three sites provided 105 (88.2%) of all
captures during 52.1% of all netting effort
in CRLA. Vidae Falls Picnic Area, Boundary
Springs, and Annie Spring provided the
highest relative abundance estimates.
Long-eared myotis and Yuma myotis appeared
to be the most widespread species being
captured at 6 (60%) sites. Silver-haired
bats were captured at 4 (40%) sites. At
CRLA, most (87.4%) of my captures were
males.
In addition to live capture techniques,
Anabat sequence files were recorded at 19
sites during 80 nights. At CRLA, 93.4% of
the activity during the first 2.5 hours of
the night was represented by 3 species or
species groups. Forty kHz myotis
(long-legged myotis and little brown
myotis), provided the highest bat activity
(a mean of 41.1 passes per hour for the
first 2.5 hours of the night). Long-eared
myotis provided the second highest activity
(11.6), followed by 50 kHz myotis
(California myotis and Yuma myotis) (11.3).
The remaining 6.6% of activity was
represented by big brown bats (2.4),
silver-haired bats (1.8), hoary bats (0.3),
Mexican free-tailed bats (0.06), and
California myotis (0.01).
Eight sites provided 72.7% of the activity
during the first 2.5 hours of the night at
CRLA, Wizard Island (a mean of 93.0 passes
per hour for the first 2.5 hours of the
night), Boundary Springs (69.0), Bear Creek
(62.3), Munson Valley (62.2), Ponderosa Pine
Picnic Area (58.0), Intersection of Wheeler
Creek and Grayback Road (52.4), Spruce Lake
(52.1), and Annie Spring (51.5). Median
activity at the all night monitoring sites
was 104.0 passes per night. Four of 9 sites
provided 78.3% of the activity at the static
monitoring locations in CRLA, Wizard Island
(a mean of 435.0 passes per night), Bear
Creek (346.7), Spruce lake (233.3), and
Sphagnum Bog (181.5). Based upon Anabat data
collected during the first 2.5 hours of the
night, 40 kHz myotis were most widespread,
being documented at 19 (100.0%) sites,
long-eared myotis were documented at 16
(84.2%), and 50 kHz myotis at 15 (78.9%).
Six species or species groups were captured,
recorded, and analyzed during 19 sampling
events at CRLA. I recognized that both
techniques likely missed species that were
capable of avoiding the respective device or
that flew outside the area sampled by these
devices. However, for comparison, it was
assumed that, at a given park, the total
number of species detected by either method
represented a complete inventory. Based upon
that assumption, captures accounted for
32.3% and acoustic sampling 67.6% of the
total occurrences. Where occurrences were
documented by both methods at a sampling
event, this accounted for 27.1% of the total
occurrences. A greater number of species
were detected by acoustic means than by
capture for all sites combined. The number
of species detected was greater for acoustic
sampling than captures (U = 45, P < 0.001).
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:
18000
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
