Acta Chiropterologica 7(1):101-109. 2005
doi: 10.3161/1733-5329(2005)7[101:FAREOA]2.0.CO;2

Foraging and roosting ecology of a rare insectivorous bat species, Laephotis wintoni (Thomas, 1901), Vespertilionidae

David S. Jacobs1, Robert M. R. Barclay12, M. Corrie Schoeman1

1Department of Zoology, University of Cape Town, Private Bag, Rondebsoch 7701, South Africa, E-mail of DJ:

2Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada

ABSTRACT

Laephotis wintoni is a rare bat and little is known about its biology. We studied this species at Algeria Forestry Station in the Western Cape Province, South Africa. A female caught in November 2002 was pregnant and three females caught in November 2004 were all lactating. The three lactating females were radio tagged and roosted in crevices or narrow fissures in a cliff face above the valley where they foraged. Laephotis wintoni is a small insectivorous bat (body mass, ± SD = 9.6 ± 0.5 g, n = 4) with low wing loading (7.0 ± 0.7 Nm−2, n = 4), low aspect ratio (5.7 ± 0.5, n = 4), low wingtip shape index (1.2 ± 0.2, n = 4) and long ears (20.9 ± 2.3 mm, n = 2). Its morphology suggests that it is a slow manoeuvrable flyer that can fly close to vegetation, or the ground or over water surfaces. Its relatively pointed wings suggest that it probably does not fly in dense clutter. Furthermore, it combines this wing shape with echolocation calls of relatively low intensity, short duration (2.6 ± 0.8 ms, n = 5), narrow band (13.5 ± 2.9 kHz, n = 5) and surprisingly low peak frequency (22.1 ± 0.6 kHz, n = 5). The latter two parameters make it unlikely that the calls are used to overcome masking effects associated with flying in dense clutter. Instead, we propose that its echolocation calls are adapted to be less audible to tympanate insects. This is supported by the fact its diet is dominated by moths in a habitat where tympanate moths comprise 90% of the moth population.

Received: March 16, 2005; Accepted: June 2, 2005



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Cited by

Chad M. Hoxeng, Matthew M. Apling, Peter I. Ritson, Christine V. Portfors. (2007) Light tagging disrupts social dynamics of bat harems. Acta Chiropterologica 9:1, 161-169
Online publication date: 1-Apr-2007.

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