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Abstract
The palila (Loxioides bailleui) population on Mauna Kea Volcano, Hawai‘i Island, was estimated from annual surveys in 2019−2021, and a trend analysis was performed on survey data from 1998−2021. The 2019 population was estimated at 1,030−1,899 birds (point estimate: 1,432), the 2020 population was estimated at 964−1,700 birds (point estimate: 1,312), and the 2021 population was estimated at 452−940 birds (point estimate: 678). Since 1998, a visual inspection of the size of the area containing palila detections on the western slope based on the minimum/maximum elevations has not shown a substantial change, indicating that the range of the species has remained stable; although this area represents only about 5% of its historical extent. During 1998−2005, palila numbers fluctuated between 4,000 and 6,000, followed by a steep decline. After 2010, palila estimates stabilized around an abundance of 2,000 with a much slower rate of decline. The decline during 1998−2021 was on average 229 birds per year with very strong statistical support for an overall downward trend in abundance. Over the 23-year monitoring period, the estimated rate of change equated to an 89% decline in the population.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | State or Local Government Series |
| Title | 2019-2021 Palila abundance estimates and trend |
| Series title | Hawaii Cooperative Studies Unit Technical Report |
| Series number | 101 |
| Year Published | 2022 |
| Language | English |
| Publisher | Hawai‘i Cooperative Studies Unit, University of Hawai‘i at Hilo |
| Contributing office(s) | Pacific Island Ecosystems Research Center |
| Description | iii, 17 p. |
| Country | United States |
| State | Hawaii |
| Other Geospatial | Mauna Kea Volcano |
| Google Analytic Metrics | Metrics page |