Foraging behaviour alters with social environment in a juvenile songbird.


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Type
Article
Change log
Authors
Franks, Victoria R 
McCready, Mhairi 
Abstract

Early independence from parents is a critical period where social information acquired vertically may become outdated, or conflict with new information. However, across natural populations, it is unclear if newly independent young persist in using information from parents, or if group-level effects of conformity override previous behaviours. Here, we test if wild juvenile hihi (Notiomystis cincta, a New Zealand passerine) retain a foraging behaviour from parents, or if they change in response to the behaviour of peers. We provided feeding stations to parents during chick-rearing to seed alternative access routes, and then tracked their offspring's behaviour. Once independent, juveniles formed mixed-treatment social groups, where they did not retain preferences from their time with parents. Instead, juvenile groups converged over time to use one access route- per group, and juveniles that moved between groups switched to copy the locally favoured option. Juvenile hihi did not copy specific individuals, even if they were more familiar with the preceding bird. Our study shows that early social experiences with parents affect initial foraging decisions, but social environments encountered later on can update transmission of arbitrary behaviours. This suggests that conformity may be widespread in animal groups, with potential cultural, ecological and evolutionary consequences.

Description
Keywords
conformity, horizontal transmission, passerine, social information, vertical transmission, Animals, Feeding Behavior, Learning, New Zealand, Passeriformes, Social Behavior, Social Environment, Songbirds
Journal Title
Proc Biol Sci
Conference Name
Journal ISSN
0962-8452
1471-2954
Volume Title
287
Publisher
The Royal Society
Rights
All rights reserved
Sponsorship
Natural Environment Research Council (NE/K00929X/1)
We would like to thank the Department of Conservation and Supporters of Tiritiri Matangi for their assistance during this study. We are grateful to Neeltje Boogert, Lucy Aplin, and Erica van de Waal for helpful discussions on study design and analyses, and two anonymous reviewers whose comments greatly improved the manuscript. VF was supported by a Balfour PhD studentship (Department of Zoology, University of Cambridge); RT was supported by an Independent Research Fellowship from the Natural Environment Research Council UK (NE/K00929X/1) and a start-up grant from the Helsinki Institute of Life Science (HiLIFE), University of Helsink