Journal of Ecology and The Natural Environment

Article Number - 859932242855


Vol.6(2), pp. 56-64 , February 2014

DOI: 10.5897/JENE2013.0424   Total Views: 477

ISSN: 2006-9847   Downloaded: 488


Full Length Research Paper

Effect of passive acoustic sampling methodology on detecting bats after declines from white nose syndrome










 Laci S. Coleman      W. Mark Ford      Chris A. Dobony      Eric R. Britzke   

Accepted: 09 December 2013      Published: 28 February 2014


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 Abstract

Concomitant with the emergence and spread of white-nose syndrome (WNS) and precipitous decline of many bat species in North America, natural resource managers need modified and/or new techniques for bat inventory and monitoring that provide robust occupancy estimates. We used Anabat acoustic detectors to determine the most efficient passive acoustic sampling design for optimizing detection probabilities of multiple bat species in a WNS-impacted environment in New York, USA. Our sampling protocol included: six acoustic stations deployed for the entire duration of monitoring as well as a 4 x 4 grid and five transects of 5-10 acoustic units that were deployed for 6-8 night sample durations surveyed during the summers of 2011-2012. We used Program PRESENCE to determine detection probability and site occupancy estimates. Overall, the grid produced the highest detection probabilities for most species because it contained the most detectors and intercepted the greatest spatial area. However, big brown bats (Eptesicus fuscus) and species not impacted by WNS were detected easily regardless of sampling array. Endangered Indiana (Myotis sodalis) and little brown (Myotis lucifugus) and tri-colored bats (Perimyotis subflavus) showed declines in detection probabilities over our study, potentially indicative of continued WNS-associated declines. Identification of species presence through efficient methodologies is vital for future conservation efforts as bat populations decline further due to WNS and other factors.   

 

Key words: White-nose syndrome, detection probability, Indiana bat, little brown bat.