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Chart #2: |
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From 28 June 1982 through 30 June 2012 at Hilton Pond Center for Piedmont Natural History, 57,525 individuals and 126 species of birds have been banded. Of these, more than 400 individuals were banded for each of the top 23 species (above). The 8,891 House Finches (Carpodacus mexicanus) and 7,909 Purple Finches (C. purpureus) made them among the most common species. American Goldfinches (Carduelis tristis) come in second at 8,453. Pine Siskins (C. pinus) were regular in the middle- and late-1980's but dropped off drastically, with only 16 banded in 14 winters from 1994-95 through 2007-08. There was finally another incursion of 224 in the winter of 2008-09 and then an all-time high of 663 in the winter of 1010-11. (Siskins are highly irruptive in the Southeast, so it is difficult to determine what these fluctuating numbers might mean.) Nonetheless, through June 2012 these four "winter finches" together made up nearly half of all birds banded (27,655 or 48.07%); the highest level for these four species was on 12 April 1993 when they made up 48.53% of all birds that had been banded at the Center. The most common non-finches have been 4,491 Ruby-throated Hummingbirds (Archilochus colubris) that are a primary focus for summer bird research at Hilton Pond Center. The top nine species (more than 1,000 bandings each) made up 70.3% of all bandings (n = 40,467). |
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