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Canopy and edge activity of bats in a quaking aspen (Populus tremuloides) forest

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Characteristics of edges affect the behavior of species that are active in and near edges. Forest canopies may provide edge-like habitat for bats, though bat response to edge orientation has not been well examined. We sampled bat activity in quaking aspen (Populus tremuloides Michx.) forest canopies and edges in Heber Valley, Utah, during summer 2009 using Anabat detectors. Categorization and regression tree (CART) analysis of echolocation characteristics (e.g., frequency, duration) identified two guilds based on characteristic frequency (i.e., high- and low-frequency guilds). We used linear regression to compare characteristics of canopy and edge vegetation (e.g., tree height, diameter at breast height) to bat activity levels. Activity levels of high-frequency bats did not respond differentially to edge vegetation; low-frequency bat activity seemed to respond to canopy height. Activity levels of high-frequency bats were significantly greater than low-frequency bats in both edges and canopies. We detected significantly more bat activity in forest edges than in forest canopies, indicating the importance of edges to bats in forests.

Keywords: Anabat SD1; canopy; echolocation; edge; forest; forêt; frequency guild; guilde selon la fréquence; lisière; long-legged myotis (Myotis volans); quaking aspen (Populus tremuloides); tremble (Populus tremuloides); vespertilion à longues oreilles de l’Ouest (Myotis evotis); vespertilion à longues pattes (Myotis volans); voûte; western long-eared myotis (Myotis evotis); écholocation

Document Type: Research Article


Publication date: July 19, 2012

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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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