Technical Report # 140. Fraser, H.R., V. Parker-Geisman and G.R. Parish, IV. April 2007. Hawaiian hoary bat inventory in national parks on the islands of Hawai`i, Maui and Moloka`i

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Because bats are often the only native terrestrial mammals on geographically isolated
island systems, they are critical to the biodiversity of mammalian fauna. The endemic
Hawaiian hoary bat (Lasiurus cinereus semotus) is the only extant species of bat found in
the Hawaiian Islands. The objectives of the Hawaiian hoary bat inventory were to
determine presence/no detection of bats in national parks and adjacent areas on the
islands of Hawai`i, Maui, and Moloka`i, assess distribution of bats in these national
parks, and make general associations between bats and selected habitats and elevations.
We used acoustic detection systems, along with visual observations, to accomplish these
objectives. Through repeat surveys of points established in Hawai`i Volcanoes National
Park, we found that bats occupied 33% of study sites from April to July 2005. In
addition, we found that bats occupied 44% of sites established on the west side of
Hawai`i Island in Kaloko-Honokōhau National Historical Park, Pu`ukoholā Heiau
National Historic Site, and Pu`uhonua o Hōnaunau National Historical Park. Since we
were only able to do a brief survey of Haleakalā National Park and Kalaupapa National
Historical Park, we did not calculate site occupancy proportions for these parks. Results
of our survey show that from April to June, Hawaiian hoary bats are most active 40-60
minutes after sunset, but they begin to emerge earlier in July. Furthermore, they appear
to be opportunistic and forage in a variety of habitats, including native and non-native
forests and shrublands, along roads and trails, and over areas of fresh/brackish water and
open ocean.

Title page, table of contents, list of tables and list of figures

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Introduction and methods

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Results and discussion

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Literature cited

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