A1 Journal article (refereed)
Balancing food, activity and the dangers of sunlit nights (2019)

Bleicher, S. S., Haapakoski, M., Morin, D. J., Käpylä, T., & Ylönen, H. (2019). Balancing food, activity and the dangers of sunlit nights. Behavioral Ecology and Sociobiology, 73(7), Article 95. https://doi.org/10.1007/s00265-019-2703-y

JYU authors or editors

Publication details

All authors or editors: Bleicher, Sonny S.; Haapakoski, Marko; Morin, Dana J.; Käpylä, Teemu; Ylönen, Hannu

Journal or series: Behavioral Ecology and Sociobiology

ISSN: 0340-5443

eISSN: 1432-0762

Publication year: 2019

Volume: 73

Issue number: 7

Article number: 95

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/s00265-019-2703-y

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65168


Living in northern latitudes poses challenges to the animals that live in those habitats. The harsh environment provides a short breeding season where the sunlit summer nights provide little reprieve from visibility to predators and increased risk. In this paper, we tested the activity and food choice patterns of bank voles Myodes glareolus in early spring season, categorized by 18 h of daylight and 6 h of dusk in every day cycle. We found that territorial females showed a less predictable pattern of activity than males that were most active during the hours of dusk. The voles also showed preference to forage on high carbohydrate foods at sunset, while switching over to a more protein and fat-based diet towards sunrise. This shift is suggestive of a diet that is a direct adaptation to day-long fasts. Our results suggest a sensitive mechanism between food choice and predator avoidance in a system where light summer nights increase the predation risk considerably.

Keywords: evolutionary ecology; animal behaviour; game theory; nutrition; predation; Clethrionomys glareolus

Free keywords: foraging ecology; subarctic forests; vole-weasel model system; sex bias and social behaviour; evolutionary game theory; physiological energetics

Contributing organizations

Related projects

Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2

Last updated on 2023-03-10 at 12:13