Distribution and trends of endemic Hawaiian waterbirds, 1986–2023

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dc.coverage.spatialHawaiian Islands
dc.creatorP. Marcos Gorresen
dc.creatorRichard J. Camp
dc.creatorEben H. Paxton
dc.date.accessioned2024-10-07T22:07:20Z
dc.date.available2024-10-07T22:07:20Z
dc.date.issued2024-10-07
dc.description.abstractThis study updates the status assessment of four endemic endangered Hawaiian waterbird species—ae‘o (Hawaiian stilt, Himantopus mexicanus knudseni), ‘alae ke‘oke‘o (Hawaiian coot, Fulica alai), ‘alae ‘ula (Hawaiian gallinule, Gallinula galeata sandvicensis), and koloa maoli (Hawaiian duck, Anas wyvilliana)—from 1986 to 2016 by incorporating new data from 2017–2023. State-space models, which account for biological and sampling variation, were fitted to estimate population sizes and trends from both core and non-core wetland survey sites. Long-term trends (1986–2023) largely show increasing populations for all four species, but recent short-term trajectories (2013–2023) are to a greater degree than previous analyses, predominantly negative, indicating accentuated declines in some island populations. Summer counts have declined relative to winter counts over the 38-year period, indicating potential changes in habitat availability and breeding patterns due to shifting rainfall patterns. Although negative trends were apparent in some non-core wetlands, our study underscores the importance of both core and non-core wetlands for waterbird populations.
dc.formatTechnical Report
dc.format.extent41 pages
dc.identifier.citationP. Marcos Gorresen, Richard J. Camp, and Eben H. Paxton. 2024. Distribution and trends of endemic Hawaiian waterbirds, 1986–2023. Hawai‘i Cooperative Studies Unit Technical Report HCSU-113. University of Hawai‘i at Hilo. 40 pages. http://hdl.handle.net/10790/5396
dc.identifier.urihttps://hdl.handle.net/10790/5396
dc.languageeng
dc.languagehaw
dc.rightshttp://rightsstatements.org/vocab/NoC-NC/1.0/
dc.subjectae‘o
dc.subject‘alae ke‘oke‘o
dc.subject‘alae ‘ula
dc.subjectAnas wyvilliana
dc.subjectendemic Hawaiian waterbird
dc.subjectFulica alai
dc.subjectGallinula galeata sandvicensis
dc.subjectHawaiian coot
dc.subjectHawaiian duck
dc.subjectHawaiian gallinule
dc.subjectHawaiian stilt
dc.subjectHimantopus mexicanus knudseni
dc.subjectkoloa maoli
dc.subjectpopulation trends
dc.subjectwetlands
dc.titleDistribution and trends of endemic Hawaiian waterbirds, 1986–2023
dcterms.rightsWork cannot be altered.
dcterms.typeText

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