Patterns of Spatial use and movement of the Poóuli – a critically endangered Hawaiian honeycreeper |
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Authors: | Jim J Groombridge Bill Sparklin Trent Malcolm Chris N Brosius Marcy M Okada James C Bruch |
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Institution: | (1) Maui Forest Bird Recovery Project, 2465 Olinda Road, 96768 Makawao, HI;(2) Present address: Durrell Institute of Conservation and Ecology, University of Kent, Canterbury, CT2 7NZ, UK;(3) Present address: Kahoólawe Island Reserve Commission, 811 Kolu Street, Suite 201, Wailuku, Hawaii, 96793 |
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Abstract: | The Poóuli (Melamprosops phaeosoma) is a highly endangered Hawaiian honeycreeper endemic to Maui, and is currently one of the World's rarest birds. Only two
wild individuals of this species are now known to exist, and they are restricted to the windward slopes of Haleakala volcano
on east Maui. Studies of the more common honeycreepers on the Hawaiian islands describe a diverse array of spatial use and
movement patterns, which vary according to specific ecological needs. In contrast, spatial use and movement of Poóuli are
very poorly known, despite continuous field monitoring of all three individuals since 1997. We analyzed annual data by breeding
season between 1995 and 2001 for three individuals, and eight days of telemetry data derived from the radio-tracking of one
individual in 2002, using GIS and conventional methods, to estimate home range size, and to interpret these data alongside
those for other honeycreepers. We estimated mean home range sizes of 8.43 hectares (ha) from annual re-sights using kernel
analysis and 2.14 ha using minimum convex polygons, and 8.44 and 3.51 ha respectively from telemetry data. Our estimates conform
to those derived for other insectivorous honeycreepers, but indicate that Poóuli may forage widely to support their diet of
forest snails. Our home range size estimates are compatible with estimates of population density for Poóuli that were derived
from field transects between 1975 and 1985, suggesting that such field methods may be a reliable density estimator for rare
forest birds.
Jim J. Groombridge and Bill Sparklin: Joint first author |
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Keywords: | Home range Honeycreeper Movement Poóuli Territory |
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