Size does matter: crocodile mothers react more to the voice of smaller offspring.

Abstract:

:Parental care is widespread in Archosaurs (birds, crocodilians, dinosaurs and pterosaurs), and this group provides a useful model for the evolution of parent-offspring interactions. While offspring signalling has been well-studied in birds, the modulation of parental care in crocodilians remains an open question. Here we show that acoustic communication has a key role in the dynamics of crocodilian' mother-offspring relationships. We found embedded information about the emitter's size in juvenile calls of several species, and experimentally demonstrated that Nile crocodile mothers breeding in the wild are less receptive to the calls of larger juveniles. Using synthetized sounds, we further showed that female' reaction depends on call pitch, an important cue bearing size information. Changes in acoustic interactions may thus go with the break of maternal care as well as dispersal of juvenile crocodilians. This process could have characterized other archosaurs displaying rapid early growth such as dinosaurs and pterosaurs.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Chabert T,Colin A,Aubin T,Shacks V,Bourquin SL,Elsey RM,Acosta JG,Mathevon N

doi

10.1038/srep15547

subject

Has Abstract

pub_date

2015-10-23 00:00:00

pages

15547

issn

2045-2322

pii

srep15547

journal_volume

5

pub_type

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