Wetland, forest, and open paddy land are the key foraging habitats for Germain’s swiftlet (Aerodramus inexpectatus Germani) in southern Thailand

Journal article

Authors/Editors

GEORGE ANDREW GALE

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Publication Details

Author list: Petkliang N., Gale G.A., Brunton D.H., Bumrungsri S.

Publisher: SAGE Publications

Publication year: 2017

Journal: Tropical Conservation Science (1940-0829)

Volume number: 10

ISSN: 1940-0829

eISSN: 1940-0829

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034585935&doi=10.1177%2f1940082917698467&partnerID=40&md5=c8008942237848a39989a82477bc0d0d

Languages: English-Great Britain (EN-GB)

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Abstract

Germain’s swiftlets (Aerodramus inexpectatus germani) are farmed regularly in Southeast Asia and produce highly valuable nests for which there is an increasing demand. Some populations of this species are thought to be decreasing, but little is known about the habitat used by swiftlets for foraging. Here, we focused on this swiftlet’s foraging habitat selection and describe their daily and seasonal variations in habitat use. We predict that the prey capture attempts would be highest during twilight periods of each day, but that overall capture rates would vary with season and habitat type. Prey capture attempts at different times of the day and seasons in five different habitats were investigated and compared to flying insect availability (estimate as biomass). For each habitat, insects were trapped immediately 5–10m above vegetation levels (i.e., tree canopy and open paddies) and 0–5m above water surfaces in water body habitat. The highest foraging intensity occurred over water bodies, forest, and open paddy land; all of which contained high numbers of major prey insects (Hymenoptera, Diptera, and Hemiptera). Foraging during the wet season was at a greater intensity than during the dry season which was associated with increased insect availability. This suggested that food supply in each habitat type, time of day, and season influenced the bird’s foraging habitat use. To conserve populations of this swiftlet, it is therefore important to protect wetlands, forest areas, and open paddy land to support natural insect prey within the foraging range of local swiftlets. © The Author(s) 2017.

Keywords

Aerodramus fuciphagus, Edible-nest swiftlet, Feeding habitat, Insect availability, Southern Thailand