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Fish pool their experience to solve problems collectively

Abstract

Access to information is a key advantage of grouping. Although experienced animals can lead others to solve problems, less is known about whether partially informed individuals can pool experiences to overcome challenges collectively. Here we provide evidence of such ‘experience-pooling’. We presented shoals of sticklebacks (Gasterosteus aculeatus) with a two-stage foraging task requiring them to find and access hidden food. Individual fish were either inexperienced or had knowledge of just one of the stages. Shoals containing individuals trained in each of the stages pooled their expertise, allowing more fish to access the food, and to do so more rapidly, compared with other shoal compositions. Strong social effects were identified: the presence of experienced individuals increased the likelihood of untrained fish completing each stage. These findings demonstrate that animal groups can integrate individual experience to solve multi-stage problems, and have implications for our understanding of social foraging, migration and social systems.

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Figure 1: Number and rate of goal zone and feeder entries.
Figure 2: Proportion of naive fish entering the goal and feeder areas.

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Acknowledgements

This work was funded by an ERC Advanced Grant to K.N.L. (EVOCULTURE, ref. 232823). We thank K. Meacham for assistance in preparing the manuscript.

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M.M.W. designed and performed the experiments. M.M.W., A.W. and K.N.L. analysed the data and co-authored the paper.

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Correspondence to Mike M. Webster.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Information

Supplementary Methods; Supplementary Figures 1–4; Supplementary Tables 1–3 (PDF 308 kb)

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Webster, M., Whalen, A. & Laland, K. Fish pool their experience to solve problems collectively. Nat Ecol Evol 1, 0135 (2017). https://doi.org/10.1038/s41559-017-0135

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