2019–2021 Palila abundance estimates and trend

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dc.contributor.authorGenz, Ayesha S.
dc.contributor.authorBrinck, Kevin W.
dc.contributor.authorAsing, Chauncey K.
dc.contributor.authorBerry, Lainie
dc.contributor.authorCamp, Richard J.
dc.contributor.authorBanko, Paul C.
dc.date.accessioned2022-01-24T13:49:04Z
dc.date.available2022-01-24T13:49:04Z
dc.date.issued2022-01-24
dc.descriptionBiological sciences technical reporten_US
dc.description.abstractThe 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.en_US
dc.format.extent20 pagesen_US
dc.identifier.urihttp://hdl.handle.net/10790/6858
dc.language.isoen-USen_US
dc.relation.ispartofseriesHCSU Technical Report Series;101
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectabundance estimationen_US
dc.subjectBird surveysen_US
dc.subjectHawaii--Hawaii Islanden_US
dc.subjectHawaii--Mauna Keaen_US
dc.subjectpalilaen_US
dc.subjectpoint-transect samplingen_US
dc.subjecttrend detectionen_US
dc.title2019–2021 Palila abundance estimates and trenden_US
dc.typeTechnical Reporten_US
dc.type.dcmiTexten_US

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