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Title: Movement Patterns of Hawaiian Petrels and Newell's Shearwaters on the Island of Hawai'i 
Author: Day, Robert H.; Cooper, Brian A.; Blaha, Richard J.
Date: 2003-04
Publisher: University of Hawai'i Press
Citation: Day RH, Cooper BA, Blaha RJ. 2003. Movement patterns of Hawaiian Petrels and Newell's Shearwaters on the island of Hawai'i. Pac Sci 57(2): 147-159.
Abstract: We studied movements and distribution and abundance of endangered
Hawaiian Petrels ('Ua'u [Pterodroma sandwichensis Ridgway]) and threatened
Newell's Shearwaters ('A'o [Puffinus auricularis newelli Henshaw]) on the
island of Hawai'i in May-June 2001 and 2002. We recorded radar targets of
either species at 14 of the 18 sites but recorded no birds visually at any site.
Movement rates of petrels and shearwaters were very low (0-3.2 targets per
hour) over all except one of the sites (Waipi'o Valley: 25.8 targets per hour). We
saw radar targets moving from shortly after sunset throughout the rest of the
sampling, suggesting that both petrels and shearwaters were present. Highest
movement rates occurred 1-2 hr after sunset, when primarily Newell's Shearwaters
are flying. Timing of evening movements suggests that Hawaiian Petrels
fly over the northern and southern parts of the island and may dominate on
Mauna Loa and Mauna Kea. In contrast, timing suggests that Newell's Shearwaters
fly over essentially the entire island (except in the southwestern part,
where no birds appear to occur), dominate numerically in the Kohala Mountains,
and occur in low numbers on Mauna Loa, in the Puna District, and on the
northern slopes of Mauna Kea. Evening flight directions were predominantly
inland at all sites except four. The limited radar data suggest that a substantial
population change did not occur in the Puna District from 1995 to 2001-2002.
ISSN: 0030-8870

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