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Information integration for nutritional decision-making in desert locusts

Yannick Günzel, Felix B. Oberhauser, Einat Couzin-Fuchs
doi: https://doi.org/10.1101/2022.05.16.492099
Yannick Günzel
aInternational Max Planck Research School for Quantitative Behaviour, Ecology and Evolution from lab to field, 78464 Konstanz, Germany
bDepartment of Biology, University of Konstanz, 78464 Konstanz, Germany
cDepartment of Collective Behaviour, Max Planck Institute of Animal Behaviour, 78464 Konstanz, Germany
dCentre for the Advanced Study of Collective Behaviour, University of Konstanz, 78464 Konstanz, Germany
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Felix B. Oberhauser
cDepartment of Collective Behaviour, Max Planck Institute of Animal Behaviour, 78464 Konstanz, Germany
dCentre for the Advanced Study of Collective Behaviour, University of Konstanz, 78464 Konstanz, Germany
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Einat Couzin-Fuchs
bDepartment of Biology, University of Konstanz, 78464 Konstanz, Germany
cDepartment of Collective Behaviour, Max Planck Institute of Animal Behaviour, 78464 Konstanz, Germany
dCentre for the Advanced Study of Collective Behaviour, University of Konstanz, 78464 Konstanz, Germany
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  • For correspondence: einat.couzin@uni-konstanz.de
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1 Abstract

Swarms of the migratory desert locust can extend over several hundred square kilometres, and starvation compels this ancient pest to devour everything in its path. Theory suggests that gregarious behaviour benefits foraging efficiency over a wide range of spatial food distributions. However, despite the importance of identifying the processes by which swarms locate and select feeding sites to predict their progression, the role of social cohesion during foraging remains elusive. We investigated the evidence accumulation and information integration processes that underlie locusts’ nutritional decision-making by employing a Bayesian formalism on high-resolution tracking data from foraging locusts. We tested individual gregarious animals and groups of different sizes in a 2-choice behavioural assay in which food patch qualities were either different or similar. We then predicted the decisions of individual locusts based on personally acquired and socially derived evidence by disentangling the relative contributions of each information class. Our study suggests that locusts balance incongruent evidence but reinforce congruent ones, resulting in more confident assessments when evidence aligns. We provide new insights into the interplay between personal experience and social context in locust foraging decisions which constitute a powerful empirical system to study local individual decisions and their consequent collective dynamics.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted May 16, 2022.
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Information integration for nutritional decision-making in desert locusts
Yannick Günzel, Felix B. Oberhauser, Einat Couzin-Fuchs
bioRxiv 2022.05.16.492099; doi: https://doi.org/10.1101/2022.05.16.492099
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Information integration for nutritional decision-making in desert locusts
Yannick Günzel, Felix B. Oberhauser, Einat Couzin-Fuchs
bioRxiv 2022.05.16.492099; doi: https://doi.org/10.1101/2022.05.16.492099

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