Transcript Use of bat detectors for the study of bats in the eastern

NATIONAL MILITARY FISH
AND WILDLIFE ASSOCIATION:
2015 BAT WORKING GROUP MEETING
Trish Cutler and Eric Britzke
Co-chairs
Outline
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Listing updates
Acoustic monitoring basics
Election
Other business
Northern long-eared bat
• Listing as endangered was
deemed warranted in
October 2013
• Final decision to be made
by 2 April 2015
• Proposed 4d rule and reopening of comment
period on listing decision
are open for comment
until 17 March
Other bats being assessed for
potential listing
• Tri-colored bat
– FWS is conducting status review
• Little brown bat
– An official status review is being conducted
– Date to be completed - ??????
Echolocation
Call Types
• Constant Frequency
(CF)
• Frequency Modulated
(FM)
Types of echolocation calls
• Search phase
• Approach phase
• Feeding buzzes
Picture of Analook file
Call Variation
Call Variation in Habitats
Open
Clutter
Factors affecting species ID
Recording
environment
Analysis
Acoustic ID
Impacts from the recording
environment
• Habitat clutter
• Site selection
• Orientation
• Efficiency of the program will vary with
these factors. To maximize accuracy and
utility of the results, detectors should be
placed in appropriate spots (a limitation of
all sampling methods)
Acoustic identifications are not
perfect (and will never be)
Classification rates (%) of mixture
DFA
MYAU
MYAU
MYGR
80
MYGR
93
20
3
MYSE
3
MYSE
MYSO
4
3
89
2
5
MYSO
Other
MYLU
3
1
94
MYLE
MYLU
MYLE
6
1
6
93
2
91