Ruddy Turnstones recorded per party hr on the Honolulu
Christmas Count, O'ahu, 1949-2007 (see Count
Page). The decline during the
1950s-1970s, and increase during the 1970s-2000s could
reflect either population dynamics (e.g., perhaps related to Pacific Decadal Oscillation)
or it might reflect changes in foraging habitat in se. O'ahu.
Graphs of Christmas Count data
developed as part of The Birds of the Hawaiian Islands: Occurrence, History, Distribution, and
Status by Robert L. Pyle and Peter Pyle http://hbs.bishopmuseum.org/birds/rlp-monograph/2009/