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Granary-Site Selection by Acorn Woodpeckers in the Willamette Valley,

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dc.creator Johnson, Eric M.
dc.creator Rosenberg, Daniel K.
dc.date.accessioned 2010-06-10T14:27:46Z
dc.date.available 2010-06-10T14:27:46Z
dc.date.issued 2006-07-14
dc.identifier.citation Johnson, E. M., and D. K. Rosenberg. "Granary-Site Selection by Acorn Woodpeckers in the Willamette Valley, Oregon." Northwest Science 80.3 (2006): 177-83. en
dc.identifier.uri http://hdl.handle.net/1957/16207
dc.description © 2006 by the Northwest Scientific Association en
dc.description.abstract The acorn woodpecker is among the most common primary cavity nesting bird of the Oregon white oak woodlands. In most of their range, acorn woodpeckers are dependent on granaries for acorn storage, yet little is known about their selection of granary sites. We compared habitat characteristics within 12 m of granary and non-granary trees at 20 acorn woodpecker colonies in Benton County, Oregon during the winter of 2001. Compared to non-granaries, granary plots consistently had greater oak basal area and shorter shrub height, and granary trees were of larger diameter. Within each of the 20 sites, oak basal area was greater near granary than non-granary trees. This, together with the selection for larger diameter granaries, suggests acorn woodpeckers are more likely to locate granaries in the immediate area of high acorn production. Increased acorn production in the vicinity of granaries is likely beneficial to the birds because minimal effort is expended in caching maximum forage. Our results shed light on granary selection at the spatial scale of the immediate area surrounding granaries and suggest factors associated with acorn woodpecker distribution at the landscape scale. en
dc.language.iso en_US en
dc.publisher Northwest Scientific Association en
dc.relation.ispartofseries Northwest science en
dc.relation.ispartofseries Vol. 80 No. 3 (2006) en
dc.subject Melanerpes formicivorus en
dc.subject Woodpecker en
dc.subject Granary-Site en
dc.title Granary-Site Selection by Acorn Woodpeckers in the Willamette Valley, en
dc.type Article en

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