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 OpenClutter
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 MYAUMYGRMYLEMYLUMYSEMYSO MYAU 803 MYGR 941 MYLE 9343 MYLU MYSE 293 MYSO Other 31