NOTE UPDATED VERSION 2 (2017) AVAILABLE HERE
Hawaii Christmas Bird Count Data
More-recent trends in the occurrence of many bird species in Hawaii have been inferred by data collected during Christmas Bird Counts through 2007 (see Introduction for more information). Graphs have been prepared based on five Christmas Counts that have extended consistently for at least 20 consecutive years, at Kapa'a (1971-2007) and Lihue (1972-1992) on Kaua'i, at Waipi'o (1977-2007) and Honolulu (1944-2007) on O'ahu, and at Volcano (1972-2007) on Hawai'i Island. Species were selected based on observations of at least 70 individuals during at least 13 years of the count, and graphs were prepared for species of interest and those counts with trends or discernable cyclic patterns. Regressions were performed on number of birds observed per party hour against year, and significant trends (based on P < 0.05) are reported for species recorded throughout the time frame of the count.
The following table indicates selected species and provides links to graphs when created. In the table, "Increase" and "Decrease" indicate species that either have significant trends throughout the count period, or species with populations that either came into or became extirpated from, respectively, the count circle during the period. "Cyclic" indicates a species that shows apparent cycles, peaks, or periods of low numbers within the count time frame but do not show significant overall linear trends. Links to graphs are provided for species with increasing, decreasing, and cyclic patterns. "No Trend" indicates stable or fluctuating numbers but no significant linear trend or apparent cyclic patterns; graphs were not created for most of these species.
Click on species name for pdf versions of species accounts.
Version 1 completed Dec 2009 and will not be updated for content until Version 2 is posted (typos and bad links may be fixed). Plans are to complete Version 2 sometime in 2011-2013, with further updated versions to be completed every 2-4 years thereafter. Comments, errors, typos, bad links, updated information, any other suggestions: Please contact Peter Pyle at ppyle@bishopmuseum.org.
Citation: Pyle, R.L., and P. Pyle. 2009. The Birds of the Hawaiian Islands: Occurrence, History, Distribution, and Status. B.P. Bishop Museum, Honolulu, HI, U.S.A. Version 1 (31 December 2009) http://hbs.bishopmuseum.org/birds/rlp-monograph/2009