NATIONAL MILITARY FISH AND WILDLIFE ASSOCIATION:

2015 BAT WORKING GROUP MEETING

Trish Cutler and Eric Britzke

Co-chairs

Outline

• 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 re-opening 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

Acoustic ID

Analysis

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 MYGR MYLE MYLU MYSE MYSO

MYAU 80 3MYGR 94 1MYLE 93 4 3MYLU 20 3 89 6MYSE 2 93MYSO 5 6 2 91Other 3 1