Hawaiian Coots recorded per party hr on the Waipi'o
Christmas Count, 1977-2007 (see Count
Page), showing a declining
trend, opposite to that of the Kapa'a Christmas Count. These trends
may relate to local wetland conditions and/or increased emigration of birds from Kaua'i to O'ahu.
Fluctuations in numbers apart from the trends reflect favorable and unfavorable
conditions for breeding, as related primarily to rainfall totals (see also Common Moorhen and Hawaiian Stilt). 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/