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2015 ; 10
(9
): e0136146
Nephropedia Template TP
gab.com Text
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English Wikipedia
Distress Calls of a Fast-Flying Bat (Molossus molossus) Provoke Inspection
Flights but Not Cooperative Mobbing
#MMPMID26353118
Carter G
; Schoeppler D
; Manthey M
; Knörnschild M
; Denzinger A
PLoS One
2015[]; 10
(9
): e0136146
PMID26353118
show ga
Many birds and mammals produce distress calls when captured. Bats often approach
speakers playing conspecific distress calls, which has led to the hypothesis that
bat distress calls promote cooperative mobbing. An alternative explanation is
that approaching bats are selfishly assessing predation risk. Previous playback
studies on bat distress calls involved species with highly maneuverable flight,
capable of making close passes and tight circles around speakers, which can look
like mobbing. We broadcast distress calls recorded from the velvety free-tailed
bat, Molossus molossus, a fast-flying aerial-hawker with relatively poor
maneuverability. Based on their flight behavior, we predicted that, in response
to distress call playbacks, M. molossus would make individual passing inspection
flights but would not approach in groups or approach within a meter of the
distress call source. By recording responses via ultrasonic recording and
infrared video, we found that M. molossus, and to a lesser extent Saccopteryx
bilineata, made more flight passes during distress call playbacks compared to
noise. However, only the more maneuverable S. bilineata made close approaches to
the speaker, and we found no evidence of mobbing in groups. Instead, our findings
are consistent with the hypothesis that single bats approached distress calls
simply to investigate the situation. These results suggest that approaches by
bats to distress calls should not suffice as clear evidence for mobbing.