Passive acoustic monitoring and automated analysis as an alternative to
trapping for monitoring species richness and seasonal swarming behaviour
of Myotis bats
- R Thomas,
- Stephen Davison
Abstract
1. Bat abundance, diversity and behaviour can be monitored by capturing
bats for identification and measurement in the hand, but this has
several disadvantages. These include disturbance to the bats, which
limits the frequency with which captures can be made at an individual
capture site, and potentially alters the behaviours being studied. 2.
Passive recording and automated analysis and identification of bat calls
offers an alternative, non-invasive approach to monitoring bats. In this
study, we examine the effectiveness of acoustic monitoring in comparison
with capture-based monitoring of seasonal swarming behaviour among
several species of Myotis bats in southern Britain. 3. We show that both
approaches have advantages and disadvantages for different tasks, but
can be viewed as complementary methods for addressing different types of
research questions. 4. We applied these complementary approaches,
together with observations from infra-red video monitoring, to describe
seasonal, overnight and species-specific variation in swarming behaviour
in a multi-species community of Myotis bats. 5. In our study of swarming
behaviour, capture and examination of bats in the hand was necessary for
measuring sex ratios, reproductive status, and even for confirmation of
species identification for some difficult to separate taxa. Capture is
also an essential aspect of tagging bats for individual identification
and tracking studies. 6. Passive acoustic monitoring is a valuable
non-invasive method for continuous monitoring of within-night, seasonal
and between-year variation in the abundance of bat calls. These can be
used as an index of variation in relative abundance within -- but not
between -- bat species.31 Oct 2020Submitted to Ecology and Evolution 02 Nov 2020Submission Checks Completed
02 Nov 2020Assigned to Editor
10 Nov 2020Reviewer(s) Assigned
02 Dec 2020Review(s) Completed, Editorial Evaluation Pending
10 Dec 2020Editorial Decision: Revise Minor
27 Oct 20211st Revision Received
08 Jul 2022Submission Checks Completed
08 Jul 2022Assigned to Editor
08 Jul 2022Review(s) Completed, Editorial Evaluation Pending
22 Jul 2022Editorial Decision: Revise Minor
16 Aug 20222nd Revision Received
17 Aug 2022Submission Checks Completed
17 Aug 2022Assigned to Editor
17 Aug 2022Review(s) Completed, Editorial Evaluation Pending
06 Sep 2022Editorial Decision: Accept