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1 December 2004 Habitat use of the Pacific Sheath-Tailed Bat (Emballonura semicaudata) on Aguiguan, Mariana Islands
Jacob A. Esselstyn, Gary J. Wiles, Arjun Amar
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We tested for differential habitat use by Pacific sheath-tailed bats (Emballonura semicaudata) in three major vegetation types on Aguiguan, Mariana Islands. Acoustic surveys of bat activity were conducted on a 370-m grid with 50 stations that covered the entire island. We controlled for a variety of extraneous factors through sampling design and use of a generalized linear model. Bat activity was significantly higher in native and nonnative forests than in non-forest habitats. There was no significant difference between activity levels in the two forest types. However, our sample size in non-native forest was limited to seven stations, thus the conclusion that non-native forest is an important habitat for the species should be viewed with caution. Our finding that E. semicaudata may be reliant on forest is critical because forests on Aguiguan are threatened by feral goats.



P. L. Bruner , and H. D. Pratt . 1979. Notes on the status and natural history of Micronesian bats. 'Elapaio, 40: 1–4. Google Scholar


B. M. Butler 1992. An archaeological survey of Aguiguan (Aguijan), Mariana Islands. Micronesian Archaeological Survey Report No. 29. Division of Historic Preservation, Commonwealth of the Northern Mariana Islands, Saipan, 260 pp. Google Scholar


J. Engbring , F. L. Ramsey , and V. J. Wildman . 1986. Micronesian forest bird survey, 1982: Saipan, Tinian, Agiguan, and Rota. U.S. Fish and Wildlife Service, Honolulu, 143 pp. Google Scholar


T. F. Flannery 1995. Mammals of the south-west Pacific & Moluccan Islands. Cornell University Press, Ithaca, 464 pp. Google Scholar


G. S. Grant , S. A. Banack , and P. Trail . 1994. Decline of the sheath-tailed bat Emballonura semicaudata (Chiroptera: Emballonuridae) on American Samoa. Micronesica, 27: 133–137. Google Scholar


J. P. Hayes 2000. Assumptions and practical considerations in the design and interpretation of echolocation-monitoring studies. Acta Chiropterologica, 2: 225–236. Google Scholar


A. M. Hutson , S. P. Mickleburgh , and P. A. Racey . 2001. Microchiropteran bats: Global status survey and conservation action plan. IUCN/SSC Chiroptera Specialist Group, International Union for the Conservation of Nature and Natural Resources, Gland, 259 pp. Google Scholar


K. F. Koopman 1997. The subspecies of Emballonura semicaudata (Chiroptera: Emballonuridae). Journal of Mammalogy, 78: 358–360. Google Scholar


T. O. Lemke 1986. Distribution and status of the sheath-tailed bat (Emballonura semicaudata) in the Mariana Islands. Journal of Mammalogy, 67: 743–746. Google Scholar


M. E. Oustalet 1895. Les mammifères et les oiseaux des Iles Mariannes. Nouvelles Archives du Muséum d'Histoire Naturelle de Paris, Séries 3, 7: 141–228. Google Scholar


Sas Institute . 1999. SAS/STAT users' guide, version 8. SAS Institute Inc., Cary, North Carolina, 752 pp. Google Scholar


D. W. Steadman 1999. The prehistory of vertebrates, especially birds, on Tinian, Aguiguan, and Rota, Northern Mariana Islands. Micronesica, 31: 319–345. Google Scholar


M. K. Tarburton 2002. Demise of the Polynesian sheath-tailed bat Emballonura semicaudata in Samoa. Micronesica, 34: 105–108. Google Scholar


O. Van Der Brug 1985. Compilation of water resources development and hydrologic data of Saipan, Mariana Islands. Water Resources Investigation Report 84-4121. U.S. Geological Survey, Honolulu, 578 pp. Google Scholar


G. J. Wiles , T. O. Lemke , and N. H. Payne . 1989. Population estimates of fruit bats (Pteropus mariannus) in the Mariana Islands. Conservation Biology, 3: 66–76. Google Scholar


G. J. Wiles , J. Engbring , and D. Otobed . 1997. Abundance, biology, and human exploitation of bats in the Palau Islands. Journal of Zoology (London), 241: 203–227. Google Scholar


M. Y. Yamashina 1943. On a new subspecies of Emballonura semicaudata from the Mariana Islands. Bulletin of the Biogeographical Society of Japan, 13: 99–100. [In Japanese]. Google Scholar
© Museum and Institute of Zoology PAS
Jacob A. Esselstyn, Gary J. Wiles, and Arjun Amar "Habitat use of the Pacific Sheath-Tailed Bat (Emballonura semicaudata) on Aguiguan, Mariana Islands," Acta Chiropterologica 6(2), 303-308, (1 December 2004).
Received: 30 May 2004; Accepted: 1 October 2004; Published: 1 December 2004

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