Characteristics associated with Newell's Shearwater (Puffinus newelli) and Hawaiian Petrel (Pterodroma sandwichensis) burrows on Kauai, Hawaii, USA

TitleCharacteristics associated with Newell's Shearwater (Puffinus newelli) and Hawaiian Petrel (Pterodroma sandwichensis) burrows on Kauai, Hawaii, USA
Publication TypeJournal Article
Year of Publication2016
AuthorsTroy J.R, Hotmes N.D, Joyce T., Behnke J.H, Green M.C
JournalWaterbirds
Volume39
Pagination199-204
Date Published2016/06
Type of ArticleArticle
ISBN Number1524-4695
Accession NumberWOS:000378186900009
Keywordsburrows; conservation; Hawaiian Islands; Hawaiian Petrel; nesting habitat; Newell's; Pterodroma sandwichensis; Puffinus newelli; seabird; Shearwater
Abstract

Small-scale environmental characteristics associated with nesting burrows of the Newell's Shearwater (Puffinus newelh) and Hawaiian Petrel (Pterodronta sandwichensis) were documented in mesic and wet montane forest on the island of Kauai, Hawaii, USA. Most plots containing burrows were located on steep slopes, ranging from 28 degrees to 48 degrees (median = 39 degrees) for the Newell's Shearwater and 0 to 67 degrees (median = 34.5 degrees) for the Hawaiian Petrel. Plots generally contained > 20% to 40% up to > 80% to 100% estimated vegetation cover 0-1 m above ground and > 0% to 20% up to > 60% to 80% cover 1-2 m above ground. Plots were also associated with estimated canopy cover from > 0% to 10% up to > 80% to 90% for the Newell's Shearwater and 0% up to > 70% to 80% for the Hawaiian Petrel. Soil in Newell's Shearwater plots tended to be harder 7.62-22.86 cm below ground, which might provide increased burrow stability. Additionally, maximum vegetation height tended to be greater above Newell's Shearwater plots (median = 6.00 m) than Hawaiian Petrel plots (median = 3.25 m). Taller trees may serve as climbing structures helping Newell's Shearwaters become airborne in thickly vegetated regions that are farther from ridgelines and associated with lighter wind speeds aloft.

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