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2017 ; 7
(1
): 11736
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Nestlings reduce their predation risk by attending to predator-information
encoded within conspecific alarm calls
#MMPMID28916776
Barati A
; McDonald PG
Sci Rep
2017[Sep]; 7
(1
): 11736
PMID28916776
show ga
Predation is one of the main threats to altricial nestlings, with predators often
locating nests via eavesdropping on begging signals. Nestlings may be able to
adjust their begging based on the current level of risk by monitoring both intra-
and interspecific alarm calls near the nest. We show that noisy miner (Manorina
melanocephala) nestlings can differentiate between terrestrial and aerial alarm
calls of their own species, as they suppressed begging behaviour for longer in
response to terrestrial rather than aerial alarm calls. This differential
response is potentially due to greater danger that terrestrial calls encode. In
contrast, nestlings ignored alarm calls of the sympatric grey butcherbird
(Cracticus torquatus) and continued to beg but reduced begging intensity in
response to the non-alarm calls of a sympatric eastern rosella (Platycercus
eximius), suggesting nestlings were likely responding based upon similarity to a
known signal as opposed to expressing a learnt behaviour. Results show that
nestlings respond adaptively to two different intraspecific alarm signals but
have not learnt to respond to the alarm calls of sympatric species. These suggest
that nestlings are able to take advantage of the complex vocal repertoire that
adults produce, although discernment is an issue when filtering out irrelevant
stimuli.