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A five-year study of Hawaiian hoary bat (Lasiurus cinereus semotus) occupancy on the island of Hawai`i

July 1, 2013

Using acoustic recordings of the vocalizations of the endangered Hawaiian hoary bat (Lasiurus
cinereus semotus) collected over a five-year period (2007–2011) from 25 survey areas across
the island of Hawai`i, we modeled the relationship between habitat attributes and bat
occurrence. Our data support the conclusion that hoary bats concentrate in the coastal lowlands
of Hawai`i during the breeding season, May through October, and migrate to interior highlands
during the winter non-breeding season. Highest occupancy peaked on the Julian date 15
September across the five-year average and during the season of fledging by the young of the
year. Although the Hawaiian hoary bat is a habitat generalist species and occurs from sea level
to the highest volcanic peaks on Hawai`i, there was a significant association between
occupancy and the prevalence of mature forest cover. Trends in occupancy were stable to
slightly increasing during the breeding season over the five years of our surveys.

Citation Information

Publication Year 2013
Title A five-year study of Hawaiian hoary bat (<i>Lasiurus cinereus semotus</i>) occupancy on the island of Hawai`i
Authors Marcos P. Gorressen, Frank J. Bonaccorso, Corinna A. Pinzari, Christopher M. Todd, Kristina Montoya-Aiona, Kevin W. Brinck
Publication Type Report
Publication Subtype Other Government Series
Series Title
Series Number HCSU-041
Index ID 70048501
Record Source USGS Publications Warehouse
USGS Organization Pacific Island Ecosystems Research Center