Prolonged foraging bouts of a solitary gleaning/hawking bat, Myotis evotis

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We investigated the foraging behaviour of reproductive female long-eared bats, Myotis evotis, roosting solitarily in natural habitat in the badlands of the South Saskatchewan River valley, Alberta, Canada. Myotis evotis behaved differently than other temperate-zone insectivorous species studied previously. Individuals foraged all night, every night, regardless of ambient temperature or reproductive condition, and only spent a small proportion of the night roosting (less than 10% of the time spent out of the roost). A high daily energy demand and an energetically costly mode of flight may necessitate this behaviour. The ability to both aerial-hawk and glean prey from surfaces may make night-long foraging profitable for M. evotis, and for other flying nocturnal insectivores that can glean.

Nous avons étudié le comportement de quête de nourriture chez des femelles reproductrices du vespertilion à longues oreilles, Myotis evotis, un percheur solitaire, dans son habitat naturel dans les badlands de la vallée de la Saskatchewan du Sud, en Alberta, Canada. Cette chauve-souris a un comportement différent de celui des autres chauves-souris insectivores de la zone tempérée étudiées précédemment. Les individus cherchent leur nourriture la nuit entière, toutes les nuits, quelle que soit la température ou leur condition reproductive, et ne se perchent que pour une courte période de la nuit (moins de 10 % de leur temps loin du perchoir). La demande énergétique quotidienne élevée et le mode de vol exigeant du point de vue énergétique peuvent nécessiter ce comportement. La capacité de chasser au vol et d'écumer les surfaces pour ramasser des proies font en sorte que la quête de nourriture pendant toute la nuit peut être une stratégie avantageuse pour M. evotis et pour d'autres insectivores nocturnes qui volent et qui sont capables d'écumer les surfaces.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2003

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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