2021 Tinian Island forest bird abundance estimates

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dc.contributor.authorCamp, Richard J.
dc.contributor.authorBak, Trevor
dc.contributor.authorGenz, Ayesha S.
dc.date.accessioned2022-05-26T07:34:16Z
dc.date.available2022-05-26T07:34:16Z
dc.date.issued2022-05-26
dc.descriptionTechnical reporten_US
dc.description.abstractThe U.S. Navy, through Micronesian Environmental Services, surveyed landbirds in the Military Lease Area on Tinian Island in May and June 2021 using point-transect distance sampling methods. There were 2,074 individuals of 14 species detected during 123 point counts. Six species were detected during >50% of the counts and were observed at relatively high abundances, while eight species occurred at <50% of the counts and were uncommon to rare. Densities of native landbirds in the Military Lease Area ranged from the uncommon Mariana kingfisher (Todiramphus albicilla) at 0.46 birds/ha (95% confidence interval [CI] = 0.33–0.63) to the very abundant bridled white-eye (Zosterops conspicillatus) at 102.63 birds/ha (95%CI = 86.70–122.91). Most distances recorded during the 2021 Military Lease Area survey were rounded to distance intervals of 0 and 5. Measuring exact distances of detected animals is preferable to collecting distances grouped into bins or rounding. Direct comparison with previously published estimates was not possible because of changes in the sampling frame; however, densities of six species were greater, two were smaller, and one was similar to the 2008 survey estimates for the Hagoi, Diablo, and Masalog regions. Our findings indicate that the landbird community in the Military Lease Area appears to be dynamic and resilient.en_US
dc.format.extent22 pagesen_US
dc.identifier.urihttp://hdl.handle.net/10790/5388
dc.language.isoen-USen_US
dc.relation.ispartofseriesHCSU Technical Report Series;105
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.subjectlandbird surveysen_US
dc.subjectpoint-transect distance samplingen_US
dc.subjectMariana Islands--Tinianen_US
dc.title2021 Tinian Island forest bird abundance estimatesen_US
dc.typeTechnical Reporten_US
dc.type.dcmiTexten_US

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