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Roosts and home ranges of spotted bats (Euderma maculatum) in northern Arizona

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Roosting ecology and foraging behavior of spotted bats (Euderma maculatum (J.A. Allen, 1891)) are poorly known. We captured 47 spotted bats at three locations in northern Arizona and attached radio transmitters to 16 bats to identify roosts and home ranges. We identified 14 roosts for 12 bats. Female roosts faced south; males did not select a roost aspect. Bats used a mean of 1.4 roosts during 10 days. Mean distances from capture site and nearest perennial water source to roosts were 15.1 and 5.8 km, respectively. Maximum and minimum distances from capture to roost site were 36.3 and 2.3 km, respectively. Home ranges (95% use, minimum convex polygon method) for bats averaged 297 km2, which was much larger than reported for spotted bats elsewhere in their range and other insectivorous bats. Maximum flight speed was 53 km/h. Most foraging locations were in desert scrub vegetation, but bats also used woodlands and forests, perhaps seeking seasonal prey or cooler sites to reduce water stress. Maternity roosts were remote, difficult to access, and within protected areas in northern Arizona. Foraging areas and ponds used for drinking, however, included private and public lands managed for a variety of uses.

Document Type: Research Article


Affiliations: 1: School of Forestry, Northern Arizona University, P.O. Box 15018, Flagstaff, AZ 86011, USA. 2: Bureau of Land Management, Arizona Strip Field Office, St. George, UT 84790, USA. 3: 575 East 43rd Avenue, Eugene, OR 97405, USA. 4: Navajo Natural Heritage Program, P.O. Box 1480, Window Rock, AZ 86515, USA. 5: Department of Evolution, Ecology, and Organismal Biology, 260 Jennings Hall, The Ohio State University, 1735 Neil Avenue, Columbus, OH 43210, USA. 6: Department of Ecology, Evolution, and Organismal Biology, 253 Bessey Hall, Iowa State Universities, Ames, IA 50011, USA.

Publication date: December 16, 2011

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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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