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The effects of personality on survival and trappability in a wild mouse during a population cycle

  • Behavioral ecology – original research
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Abstract

The pace-of-life syndrome (POLS) theory provides an evolutionary explanation for the existence of consistent among-individual variation in behaviour, or animal personality. Herein, individuals with a fast lifestyle are considered to be bolder and should take more risks resulting in a lower life expectancy compared to shyer individuals with a slower lifestyle. However, this assumption depends on the levels of intra-specific competition that the individuals experience which has rarely been tested in species that experience large changes in competition on a very short time scale. We used the multimammate mice (Mastomys natalensis) as a model system to study the POLS assumption by investigating the effects of two personality traits (exploration and stress-sensitivity) on survival, maturation (a proxy for reproductive investment) and recapture probability during one population cycle (Nindividuals = 201). Such a cycle consists of two phases in which the levels of intra-specific competition vary drastically. We found that only one personality trait, namely stress-sensitivity, had a negative effect on both survival and recapture probability but none of them affected maturation. This suggests that less stress-sensitive individuals take more risks in the wild and have a higher survival probability compared to high stress-sensitive individuals. However, the effect of personality on survival was only present during the population decrease phase, when the levels of intra-specific competition are high due to a scarcity of food. This suggests that seasonal changes in competition might be important in the evolution and maintenance of animal personalities in species whose population dynamics have a clear seasonal component.

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The data will be archived online on the Center for Open Science (OSF), a public and digital repository, should the manuscript be accepted.

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Acknowledgements

We would like to that the staff at the Pest Management Center (Sokoine University of Agriculture) for their excellent assistance during the fieldwork, specifically Shabani Lutea, Goefrey Sabuni, Omary Kibwana, Baraka Edson, Maddy Wheatley, Aurelia Bongers and Steven Van den Panhuyzen. Special thanks to Bert Thys for his assistance during the whole process.

Funding

BVB was funded by the Ph.D. fellowship from the Research Foundation Flanders (FWO) (Grant ID: 11A0817N).

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Authors and Affiliations

Authors

Contributions

BVB, JM, AM, EM and HL conceived and designed the study. BVB collected the data with the support of JM, CAS and AM. BVB and VS performed the data analysis with input from JM, EM and HL. The first draft was written by BVB and all authors contributed substantially to revisions.

Corresponding author

Correspondence to Bram Vanden Broecke.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All experimental procedures were approved by the University of Antwerp Ethical Committee for Animal Experimentation (LA1100135) and adhered to the EEC Council Directive 2010/63/EU and followed the Animal Ethics guidelines of the Research Policy of Sokoine University of Agriculture.

Additional information

Communicated by Janne Sundell.

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Supplementary file1 (DOCX 27 KB)

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Vanden Broecke, B., Sluydts, V., Mariën, J. et al. The effects of personality on survival and trappability in a wild mouse during a population cycle. Oecologia 195, 901–913 (2021). https://doi.org/10.1007/s00442-021-04897-9

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  • DOI: https://doi.org/10.1007/s00442-021-04897-9

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