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

• Autorzy: Jacobs D.S. , Barclay R. M. R. , Corrie Schoeman M.
• Języki publikacji: EN

Abstrakty

EN

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, x̄ ± 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.

• Wydawca: -
• Czasopismo: Acta Chiropterologica
• Rocznik: 2005
• Tom: 07
• Numer: 1
• Opis fizyczny: p.101–109,fig.,ref.

Twórcy

autor

Jacobs D.S.

• Department of Zoology, University of Cape Town, Private Bag, Rondebsoch 7701, South Africa

autor

Barclay R. M. R.

autor

Corrie Schoeman M.

Bibliografia

• Acharya, L, and M. B. Fenton. 1999. Bat attacks and moth defensive behaviour around streetlights. Canadian Journal of Zoology, 77: 27-33.
• Aldridge, H. D. J. N. and R. M. Brigham. 1988. Load carrying and manoeuvrability in an insectivorous bat: a test of the 5% ‘rule’ of radiotelemetry. Journal of Mammalogy, 69: 379-382.
• Anthony, E. L. 1988. Age determination in bats. Pp. 47-58, in Ecological and behavioural methods for the study of bats (T. H. Kunz, ed.). Smithsonian Institution Press, Washington D.C., 533 pp.
• Bowie, R. C. K., D. S. Jacobs, and P. J. Taylor. 1999. Resource use by two morphologically similar insectivorous bats (Nycteris thebaica and Hipposideros caffer). South African Journal of Zoology, 34: 27-33.
• Chruszcz, B. J., and R. M. R. Barclay. 2002. Thermoregulation and roost selection by a solitary bat in southeastern Alberta, Canada. Functional Ecology, 16: 18-26.
• Fenton, M. B., and W. Bogdanowicz. 2002. Relationships between external morphology and foraging behaviour: bats in the genus Myotis. Canadian Journal of Zoology, 80: 1004-1013.
• Fenton, M. B., and J. H. Fullard. 1979. The influence of moth hearing on bat echolocation strategies. Journal of Comparative Physiology, 132: 77-86.
• Fullard, J. H. 1987. Sensory ecology and neuroethology of bats and moths: interactions on a global perspective. Pp. 244-272, in Recent advances in the study of bats (M. B. Fenton, P. Racey, and J. M. V. Rayner, eds.). Cambridge University Press, Cambridge, ix + 470 pp.
• Fullard J. H., and J. D. Dawson. 1997. The echolocating calls of the spotted bat, Euderma maculatum, are relatively inaudible to moths. Journal of Experimental Biology, 200: 129-137.
• Kalko, E. K. V., and H.-U. Schnitzler. 1998. How echolocating bats approach and acquire food. Pp. 197-204, in Bat biology and conservation (T. Kunz and P. A. Racey, eds.). Smithsonian Institute Press, Washington D.C., xiv + 365 pp.
• Kearney, T. C., and E. C. J. Seamark. In press. Morphometric analysis of cranial and external characters of Laephotis Thomas, 1901 (Mammalia: Chiroptera: Vespertilionidae) occurring in southern Africa. Annals of the Transvaal Museum.
• Koopman, K. F. 1994. Chiroptera: systematics. Pp. 1-217, in Handbook of zoology, Vol. 8, Part 60: (Mammalia) (J. Niethammer, H. Schliemann, and D. Starck, eds.). Walter de Gruyter, Berlin, 217 pp.
• Kunz, T. H. 1973. Resource utilization: Temporal and spatial components of bat activity in central Iowa. Journal of Mammalogy, 54: 14-32.
• Kunz, T. H. 1974. Feeding ecology of a temperate insectivorous bat (Myotis velifer). Ecology, 55: 693-711.
• Lausen, C., and R. M. R. Barclay. 2003. Thermoregulation and roost selection by reproductive female big brown bats (Eptesicus fuscus) roosting in rock crevices. Journal of Zoology (London), 260: 235-244.
• Meester, J. A. J., I. L. Rautenbach, N. J. Dippenaar, and C. M. Baker. 1986. Classification of southern African mammals. Transvaal Museum Monograph, 5: 1-359.
• Miller, L. A. 1983. How insects detect and avoid bats. Pp. 251-266, in Neuroethology and behavioural physiology (F. Huber and H. Markl, eds.). Springer, Berlin, 353 pp.
• Norberg, U. M., and J. M. V. Rayner. 1987. Ecological morphology and flight in bats (Mammalia: Chiroptera): wing adaptations, flight performance, foraging strategy and echolocation. Philosophical Transactions of the Royal Society of London B, 316: 335-427.
• Novick, A. 1977. Acoustic orientation. Pp 73-287, in Biology of bats, Vol. III (W. A. Wimsatt, ed.). Academic Press, New York, xvi + 651 pp.
• O’Farrell, M. J., B. W. Miller, and W. L. Gannon. 1999. Qualitative identification of free-flying bats using the Anabat detector. Journal of Mammalogy, 80: 11-23.
• Racey, P. A. 1988. Reproductive assessment in bats. Pp. 31-45, in Ecological and behavioural methods for the study of bats (T. H. Kunz, ed.). Smithsonian Institution Press, Washington D.C., 533 pp.
• Rautenbach, I. L., and J. A. Nel. 1978. Three species of microchiropteran bats recorded for the first time from the south-west Cape biotic zone. Annals of the Transvaal Museum, 31: 157-163.
• Roeder, K. D. 1967. Nerve cells and insect behavior. Harvard University Press, Cambridge, 188 pp.
• Roeder, K. D., and A. E. Treat. 1957. Ultrasonic reception by the tympanic organ of noctuid moths. Journal of Experimental Zoology, 134: 127-157.
• Ruedi, M., and F. Mayer. 2001. Molecular systematics of bats of the genus Myotis (Vespertilionidae) suggests deterministic ecomorphological convergences. Molecular Phylogenetics and Evolution, 21: 436-448.
• Rydell, J. 1992. Exploitation of insects around streetlamps in Sweden. Functional Ecology, 9: 744-750.
• Saunders, M. B., and R. M. R. Barclay. 1992. Ecomorphology of insectivorous bats: a test of predictions using two morphologically similar species. Ecology, 73: 1335-1345.
• Schmidt, S., S. Hanke, and J. Pillat. 2000. The role of echolocation in the hunting of terrestrial prey — new evidence for an underestimated strategy in the gleaning bat, Megaderma lyra. Journal of Comparative Physiology B, 186: 975-988.
• Schnitzler, H.-U., and E. K.V. Kalko, 1998. How echolocating bats search and find food. Pp. 183-196, in Bat biology and conservation (T. H. Kunz and P. A. Racey, eds.). Smithsonian Institution Press, Washington D.C., xiv + 365 pp.
• Schoeman, M. C., and D. S. Jacobs. 2003. Support for the allotonic frequency hypothesis in an insectivorous bat community. Oecologia, 134: 154-162.
• Scholtz, C. H., and E. Holm. 1996. Insects of Southern Africa. Butterworth Publishers (Pty) Ltd., Pretoria, 502 pp.
• Skinner, J. D., and R. H. N. Smithers. 1990. The mammals of the Southern African subregion. University of Pretoria, Pretoria, xxxii + 771 pp.
• Stanley, W. T., and D. Kock. 2004. New records and notes on Laephotis Thomas, 1901 (Chiroptera: Vespertilionidae). Mammalian Biology, 69: 173-181.
• Stoffberg, S., and D. S. Jacobs. 2004. The influence of wing morphology and echolocation on the gleaning ability of the insectivorous bat Myotis tricolor. Canadian Journal of Zoology, 82: 1854-1863.
• Surlykke, A. 1988. Interaction between echolocating bats and their prey. Pp. 551-566, in Animal sonar: processes and performance (P. E. Nachtigall and P. W. B. Moore, eds.). Plenum Press, New York, xv + 862 pp.
• Swift, S. M. 1980. Activity patterns of Pipistrelle bats (Pipistrellus pipistrellus) in north-east Scotland. Journal of Zoology, London, 190: 285-295.
• Taylor, P. J. 2000. Bats of southern Africa. University of Natal Press, Pietermaritzburg, 206 pp.
• Watson, J. P. 1990. New distribution of Laephotis in South Africa and Lesotho, Navorsinge van die Nasionale Museum Bloemfontein, 7: 61-70.
• Whitaker, J. O., Jr. 1988. Food habits analysis of insectivorous bats. Pp. 171-189, in Ecological and behavioural methods for the study of bats (T. H. Kunz, ed.). Smithsonian Institution Press, Washington D.C., 533 pp.

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