Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/29730

Diets of the Sympatric Pacific Sheath-Tailed Bat (Emballonura semicaudata rotensis) and Mariana Swiftlet (Aerodramus bartschi) on Aguiguan, Mariana Islands

File SizeFormat 
vol65n3-301-309.pdf159.62 kBAdobe PDFView/Open

Item Summary

Title: Diets of the Sympatric Pacific Sheath-Tailed Bat (Emballonura semicaudata rotensis) and Mariana Swiftlet (Aerodramus bartschi) on Aguiguan, Mariana Islands
Authors: Valdez, Ernest W.
Wiles, Gary J.
O'Shea, Thomas J.
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.
Issue Date: Jul 2011
Publisher: Honolulu, University of Hawaii
Citation: Valdez E, Wiles G, O'Shea T. Diets of the Sympatric Pacific Sheath-Tailed Bat (Emballonura semicaudata rotensis) and Mariana Swiftlet (Aerodramus bartschi) on Aguiguan, Mariana Islands. Pac Sci 65(3): 301-309.
Series/Report no.: vol. 65, no. 3
Abstract: The Pacific sheath-tailed bat (Emballonura semicaudata rotensis) and Mariana swiftlet (Aerodramus bartschi ) are two rare insectivorous taxa restricted
to the southern Mariana Islands in western Micronesia. It is believed that populations of both have dwindled because of impacts to their food resources. However, there is little information on the food habits of A. bartschi and none exists for E. s. rotensis. In an effort to better understand the habits of both, we investigated their diets using guano analysis. Guano was collected from two roosts in caves during a 2-week period in June and July at the onset of the rainy season. Important orders of insects consumed (percentage volume) by bats roosting at one cave included hymenopterans (64%), coleopterans (10%), lepidopterans (8%), isopterans (8%), and psocopterans (5%), whereas those at a second cave included lepidopterans (45%), hymenopterans (41%), coleopterans (10%), and isopterans (5%). Swiftlets, which roosted in only one of the caves, fed mostly on hymenopterans (88%) and hemipterans (6%). Significant differences existed between the two taxa in several insect orders eaten, with E. s. rotensis consuming more lepidopterans and coleopterans and A. bartschi taking more hymenopterans and hemipterans. Within Hymenoptera, bats fed more on ichneumoideans, whereas swiftlets ate more formicid alates and chalicidoideans. This new information on the feeding habits of E. s. rotensis and A. bartschi provides insight on the complexity of their diets during June and July, and serves as baseline information for future studies and management of their habitat.
Description: v. ill. 23 cm.
Also available through BioOne: http://www.bioone.org/doi/abs/10.2984/65.3.301
Quarterly
Pages/Duration: 10 pages
URI/DOI: http://hdl.handle.net/10125/29730
ISSN: 0030-8870
DOI: http://dx.doi.org/10.2984/65.3.301
Appears in Collections:Pacific Science, Volume 65, Number 3, 2011



Items in ScholarSpace are protected by copyright, with all rights reserved, unless otherwise indicated.