Biology of the peregrine and gyrfalcon in Greenland
A ten year study began in 1972 in West Greenland to investigate the breeding biology of the peregrine falcon. Data on nesting gyrfalcons were also collected. Thirty-four peregrine nesting sites were examined in the 6050 km2 inland study area near Søndre Strømfjord. Limited research also centered in...
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Danish Polar Center/Museum Tusculanum Press
1984
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ftsbaarhusojs:oai:ojs.tidsskrift.dk:article/142332 2024-01-28T10:05:23+01:00 Biology of the peregrine and gyrfalcon in Greenland Burnham, William A. Mattox, William G. 1984-05-30 application/pdf https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332 eng eng Danish Polar Center/Museum Tusculanum Press https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332/185984 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332 Meddelelser om Grønland. Bioscience; Vol. 14 (1985): Meddelelser om Grønland. Bioscience; 25 pp. Meddelelser om Grønland. Bioscience; Årg. 14 (1985): Meddelelser om Grønland. Bioscience; 25 pp. 0106-1054 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1984 ftsbaarhusojs 2024-01-03T23:59:24Z A ten year study began in 1972 in West Greenland to investigate the breeding biology of the peregrine falcon. Data on nesting gyrfalcons were also collected. Thirty-four peregrine nesting sites were examined in the 6050 km2 inland study area near Søndre Strømfjord. Limited research also centered in Disko Bugt and Frederikshåb. Peregrines were found nesting predominantly on high, south-facing cliffs which overlooked large areas. The mean minimum distance between peregrine eyries was 7.7 km for the inland area (1972 and 1973) and 55 km for the coast (1974). Approximately 60 percent of the inland nesting sites were occupied each year. A ten-year average production of 1.90 young per occupied site and 2.78 young per successful site was determined. Lapland longspurs, snow buntings, wheatears, and redpolls comprised 90 percent of the peregrine's diet. Raven nests and prey availability may affect gyrfalcon nesting. Gyrfalcons and peregrines did not breed successfully on the same cliffs as they do in Alaska where prey species number and density is greater. Competition for nest sites probably occurs, but prey availability may be the most significant factor affecting falcon density. Addled peregrine eggs, eggshell fragments, and peregrine prey species were collected. Whole eggs averaged 14.3 ppm wet weight (305 ppm lipid weight) DDE, while eggshell measurements showed a 16 percent thinning compared with pre-1940 eggs from Greenland. Prey species carried low levels of DDE. The peregrine population appears to be at a near critical contamination level, and a small increase in DDE level could contribute to a population decline. No indication of a decline has been observed during the study, and the population appears stable. The project banded 185 peregrines, from which 8 recoveries occurred. The recoveries suggest peregrines migrate south to winter in South America. Article in Journal/Newspaper Disko bugt Greenland gyrfalcon peregrine falcon Søndre strømfjord Alaska Lapland Aarhus University: OJS at The State and University Library Greenland |
institution |
Open Polar |
collection |
Aarhus University: OJS at The State and University Library |
op_collection_id |
ftsbaarhusojs |
language |
English |
description |
A ten year study began in 1972 in West Greenland to investigate the breeding biology of the peregrine falcon. Data on nesting gyrfalcons were also collected. Thirty-four peregrine nesting sites were examined in the 6050 km2 inland study area near Søndre Strømfjord. Limited research also centered in Disko Bugt and Frederikshåb. Peregrines were found nesting predominantly on high, south-facing cliffs which overlooked large areas. The mean minimum distance between peregrine eyries was 7.7 km for the inland area (1972 and 1973) and 55 km for the coast (1974). Approximately 60 percent of the inland nesting sites were occupied each year. A ten-year average production of 1.90 young per occupied site and 2.78 young per successful site was determined. Lapland longspurs, snow buntings, wheatears, and redpolls comprised 90 percent of the peregrine's diet. Raven nests and prey availability may affect gyrfalcon nesting. Gyrfalcons and peregrines did not breed successfully on the same cliffs as they do in Alaska where prey species number and density is greater. Competition for nest sites probably occurs, but prey availability may be the most significant factor affecting falcon density. Addled peregrine eggs, eggshell fragments, and peregrine prey species were collected. Whole eggs averaged 14.3 ppm wet weight (305 ppm lipid weight) DDE, while eggshell measurements showed a 16 percent thinning compared with pre-1940 eggs from Greenland. Prey species carried low levels of DDE. The peregrine population appears to be at a near critical contamination level, and a small increase in DDE level could contribute to a population decline. No indication of a decline has been observed during the study, and the population appears stable. The project banded 185 peregrines, from which 8 recoveries occurred. The recoveries suggest peregrines migrate south to winter in South America. |
format |
Article in Journal/Newspaper |
author |
Burnham, William A. Mattox, William G. |
spellingShingle |
Burnham, William A. Mattox, William G. Biology of the peregrine and gyrfalcon in Greenland |
author_facet |
Burnham, William A. Mattox, William G. |
author_sort |
Burnham, William A. |
title |
Biology of the peregrine and gyrfalcon in Greenland |
title_short |
Biology of the peregrine and gyrfalcon in Greenland |
title_full |
Biology of the peregrine and gyrfalcon in Greenland |
title_fullStr |
Biology of the peregrine and gyrfalcon in Greenland |
title_full_unstemmed |
Biology of the peregrine and gyrfalcon in Greenland |
title_sort |
biology of the peregrine and gyrfalcon in greenland |
publisher |
Danish Polar Center/Museum Tusculanum Press |
publishDate |
1984 |
url |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Disko bugt Greenland gyrfalcon peregrine falcon Søndre strømfjord Alaska Lapland |
genre_facet |
Disko bugt Greenland gyrfalcon peregrine falcon Søndre strømfjord Alaska Lapland |
op_source |
Meddelelser om Grønland. Bioscience; Vol. 14 (1985): Meddelelser om Grønland. Bioscience; 25 pp. Meddelelser om Grønland. Bioscience; Årg. 14 (1985): Meddelelser om Grønland. Bioscience; 25 pp. 0106-1054 |
op_relation |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332/185984 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142332 |
_version_ |
1789331661456932864 |