Emergence Behaviour of the Serotine Bat (Eptesicus Serotinus) Under Predation Risk

Zukal, Jan; Petrželková, Klára J.

doi:10.1163/156854201x00170

Neth J Zool

2001

DOI: 10.1163/156854201x00170

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Emergence Behaviour of the Serotine Bat (Eptesicus Serotinus) Under Predation Risk

Jan Zukal¹,

Klára J. Petrželková

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Cited by 2 publications

References 33 publications

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Antipredator responses of bats during short boreal nights with variable climatic conditions

Suutari,

Lehikoinen,

Lehto

et al. 2024

Journal of Mammalogy

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The threat of predation can influence the behavior of animals. To minimize the impact of predation, animals rely on antipredatory responses and effectively balance these responses with other activities to maximize survival. Boreal bats are nocturnal animals that must forage within a narrow time frame during short, light summer nights with unpredictable weather. Despite having no specialized predators, boreal bats are still subject to predation. However, whether they express antipredatory responses has not been established. We studied antipredatory responses and responses to climatic conditions in boreal bats in 2 settings: 1) during roost emergence; and 2) during foraging within Tawny Owl territories and at locations with no Tawny Owl sightings. Acoustic data were collected at 23 roosts and 10 foraging grounds. Two controlled predation threats were used—playbacks of Tawny Owl calls and fledgling calls. Fledgling calls were only played during roost emergence. In both experiments, music and no treatment were used as controls. We also incorporated weather variables in the model. According to our results, bats tend to delay their emergence by 16 min when Tawny Owl calls were played outside the roost, but this effect was not noticeable when weather variables were included. There was no difference in exit time when music or fledgling sounds were played. While foraging, bats reduced their activity in Tawny Owl territories when calls of owls or music were played compared to no treatment. These results suggest that bats might display variable antipredatory responses, but weather influences behavior of bats more than predation risk, highlighting the importance of energy-saving strategies at northerly latitudes.

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Antipredator responses of bats during short boreal nights with variable climatic conditions

Suutari,

Lehikoinen,

Lehto

et al. 2024

Journal of Mammalogy

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show abstract

Nonrandom patterns of roost emergence in big brown bats,Eptesicus fuscus

2011

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In most colonial species of bats individuals emerge en masse from day roosts each evening to begin foraging. Although some aspects of emergence behavior are understood, one previously unexplored area is the specific order in which individuals emerge. The goal of our research was to determine if big brown bats, Eptesicus fuscus, fitted with passive integrated transponder tags emerge from roosts in buildings each evening in a nonrandom order. We assessed relative and absolute order of emergence to determine if order is concordant across nights and whether individuals consistently emerge in close association with specific roost mates. We found significant concordance in rank order among nights at all roosts. At 5 roosts concordance decreased as time between dates increased. Association rates between individuals were low, and temporal analyses revealed that associations rapidly degraded over time, indicating that bats do not emerge each evening consistently with the same group of roost mates. We discuss how social structure, information transfer, and/or individual energetic needs could be responsible for the observed nonrandom patterns of emergence. Our results suggest that emergence order represents behavioral information that traditionally has been overlooked and that might be useful for characterizing aspects of the ecology and social behavior of bats and other species with cryptic behavior.

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Emergence Behaviour of the Serotine Bat (Eptesicus Serotinus) Under Predation Risk

Cited by 2 publications

References 33 publications

Antipredator responses of bats during short boreal nights with variable climatic conditions

Antipredator responses of bats during short boreal nights with variable climatic conditions

Nonrandom patterns of roost emergence in big brown bats,Eptesicus fuscus

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