Nihoa and Laysan Island passerines population abundances, trends, and habitat utilization

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dc.contributor.editorNash, Sarah
dc.coverage.spatialNihoa and Laysan Island, Northwestern Hawaiian Islands
dc.coverage.temporal2010 to 2022
dc.creatorBak, Trevor
dc.creatorCamp, Richard
dc.creatorFarmer, Chris
dc.creatorRounds, Rachel
dc.creatorPlentovich, Sheldon
dc.creatorVetter, John
dc.creatorBanko, Paul
dc.date.accessioned2024-06-19T01:37:13Z
dc.date.available2024-06-19T01:37:13Z
dc.date.issued2024-06-18
dc.description.abstractNihoa and Laysan Island, part of the Northwestern Hawaiian Islands, are host to three endangered passerine species—Nihoa finch (Telespiza ultima), Nihoa millerbird (Acrocephalus familiaris kingi), and Laysan finch (Telespiza cantans). Using point-transect distance sampling survey records from 2010 to 2022 for Nihoa and 2013 to 2019 for Laysan Island, we estimated the density and abundance of all three species. We also compared densities between habitats for both islands, classifying Nihoa habitat as Eragrostis (grass) or mixed shrub and Laysan Island as open or dense habitat. The population of Nihoa finch remained stable with slight fluctuations among years, with a population size of 6,592 (4,954–8,655) birds for the most recent sampling year, 2022. Laysan finch also remained stable with a total population in both dense and open habitat of 17,657 (11,994–23,320) for the most recent sampling year, 2019. The Nihoa millerbird significantly increased on both Nihoa and Laysan Island with a global population of 1,907 (1,291–2,766) in 2019, the most recent year both islands were sampled. Overall, the populations of these three endangered species were stable or increasing. The increase of Nihoa millerbird on Laysan Island, after being translocated to the island in 2011 and 2012, represents the successful establishment of a second viable population, leading to a decrease in the species’ IUCN extinction risk status (from critically endangered to endangered). Continued population monitoring of these endangered species can help inform future management actions and ensure their preservation into the future.
dc.formatTechnical Report
dc.format.extent35 pages
dc.identifier.urihttps://hdl.handle.net/10790/5393
dc.languageeng
dc.rightshttp://rightsstatements.org/vocab/NoC-NC/1.0/
dc.subjectendangered species
dc.subjectLaysan finch
dc.subjectLaysan Island
dc.subjectNihoa
dc.subjectNihoa finch
dc.subjectNihoa millerbird
dc.subjectNorthwestern Hawaiian Islands
dc.subjectpopulation trends
dc.titleNihoa and Laysan Island passerines population abundances, trends, and habitat utilization
dcterms.rightsCannot be altered
dcterms.typeText
prism.endingpage31
prism.number107
prism.publicationnameHawai'i Cooperative Studies Unit Technical Report Series
prism.startingpagei

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