Activity patterns of insectivorous bats during a seasonal transition period from hibernation to reproduction
Anna C. Doty A B D , Leroy Gonsalves C and Bradley S. Law C
+ Author Affiliations
- Author Affiliations
A Centre for Behavioural and Physiological Ecology, Zoology, University of New England, Armidale, NSW 2351, Australia.
B Present address: Department of Biological Sciences, Arkansas State University, Jonesboro, AR 72401, USA.
C Forest Science Unit, NSW Department of Primary Industries, Locked Bag 5123, Parramatta, NSW 2124, Australia.
D Corresponding author. Email: adoty@astate.edu
Australian Mammalogy 42(1) 1-10 https://doi.org/10.1071/AM18035
Submitted: 19 September 2018 Accepted: 5 January 2019 Published: 7 February 2019
Abstract
Bat activity is influenced by fluctuating environmental variables. It may also be influenced by energetic pressures related to pregnancy, lactation, and emergence following winter inactivity. We evaluated nightly changes in relative bat activity at Royal National Park in response to Julian date, ambient temperature, precipitation, wind speed and moon phase on a nightly scale for six weeks during spring, as insectivorous bats move out of hibernation or frequent, prolonged torpor, and into the maternal season. Interestingly, later Julian date (reflecting seasonal transition) was the sole variable that best predicted total nightly activity. In addition, we opportunistically assessed bat activity in response to a severe storm, considered a Category 1 cyclone, resulting in 96.4 mm of rain in one night and wind speeds up to 94 km h–1. Only one species of bat, Chalinolobus gouldii, was active during the storm, with activity restricted to the latter part of the evening when precipitation had reduced, indicating rapid resumption of activity following severe weather. The results of this research can be used as an indicator of emergence from winter inactivity and highlight activity patterns of bat species in relation to environmental variables to inform timing of monitoring programs, bat surveys, and targeted research.
Additional keywords: ecology, management strategies, Molossidae, Rhinolophidae, Vespertilionidae, wildlife management.
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