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Showing 1 to 2 of 2 for “"Christmas Bird Counts"”.
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The expansion of the eastern house finch population and its impact on populations of house sparrows, purple finches and American goldfinches
… Purple Finches in Indiana. Data from the Annual Christmas Bird Counts of the National Audubon Society (CBC) were used to construct five winter range maps to show the expansion of the House Finch population since 1940. A population density map based on the CBCs of 1988 and 1989 was constructed …
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Population Increase and Range Expansion of Three Psittacids in Florida and California
… viridigenalis</em>). I gathered data from the Christmas Bird Counts (CBCs) for California, Florida, and the United States since the early 1970s. I then performed linear and curvilinear regression statistics on percentage of birds seen per party-hour versus year, percentage of CBCs containing …