Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska
ABSTRACT. We summarize information available on natural history, numbers, distribution, and status of bald eagles (Haliaeetus leucocephalus) in six regions of interior Alaska: Upper Yukon, Lower Yukon, Tanana, Kuskokwim, Susitna, and Upper Copper. We identified 347 nesting territories using informat...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.576.2514 2023-05-15T13:09:39+02:00 Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska Robert J. Ritchie Skip Ambrose The Pennsylvania State University CiteSeerX Archives 1995 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.2514 http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.2514 http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf text 1995 ftciteseerx 2016-01-08T12:45:55Z ABSTRACT. We summarize information available on natural history, numbers, distribution, and status of bald eagles (Haliaeetus leucocephalus) in six regions of interior Alaska: Upper Yukon, Lower Yukon, Tanana, Kuskokwim, Susitna, and Upper Copper. We identified 347 nesting territories using information from local researchers, a raptor nest atlas, unpublished raptor survey reports, and our own surveys. Nearly 85 % of these territories were from the Copper, Susitna, and Tanana drainages. Extrapolating from the number of known nests and approximate survey coverage per drainage, we estimate that 525 to 725 pairs of bald eagles nest in interior Alaska. Observations also suggest that this population has increased substantially since the middle of this century and that numbers in some areas continue to increase. Reasons for these increases may include (1) improving health of individuals in this population; (2) reduced persecution in Alaska and in wintering areas outside the state; (3) immigration into interior Alaska from rebounding or expanding populations elsewhere; and (4) changing environmental conditions (e.g., warmer temperatures). Banding and migration data suggest that part of the population that nests north of the Alaska Range may winter in areas different from those used by populations that nest south of the Alaska Range. No environmental contaminants measured in eggs occurred at concentrations known to result in sublethal or lethal effects, and most organochlorine pesticide and mercury concentrations were an order of magnitude lower than concentrations in bald eagle eggs elsewhere in the United States. Key words: bald eagles, Haliaeetus leucocephalus, Alaska, breeding ecology, migration, contaminants RÉSUMÉ. On fait la synthèse de l’information disponible sur l’histoire naturelle, l’inventaire, la distribution et le statut du Text alaska range Arctic Kuskokwim Alaska Yukon Unknown Yukon |
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ftciteseerx |
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English |
description |
ABSTRACT. We summarize information available on natural history, numbers, distribution, and status of bald eagles (Haliaeetus leucocephalus) in six regions of interior Alaska: Upper Yukon, Lower Yukon, Tanana, Kuskokwim, Susitna, and Upper Copper. We identified 347 nesting territories using information from local researchers, a raptor nest atlas, unpublished raptor survey reports, and our own surveys. Nearly 85 % of these territories were from the Copper, Susitna, and Tanana drainages. Extrapolating from the number of known nests and approximate survey coverage per drainage, we estimate that 525 to 725 pairs of bald eagles nest in interior Alaska. Observations also suggest that this population has increased substantially since the middle of this century and that numbers in some areas continue to increase. Reasons for these increases may include (1) improving health of individuals in this population; (2) reduced persecution in Alaska and in wintering areas outside the state; (3) immigration into interior Alaska from rebounding or expanding populations elsewhere; and (4) changing environmental conditions (e.g., warmer temperatures). Banding and migration data suggest that part of the population that nests north of the Alaska Range may winter in areas different from those used by populations that nest south of the Alaska Range. No environmental contaminants measured in eggs occurred at concentrations known to result in sublethal or lethal effects, and most organochlorine pesticide and mercury concentrations were an order of magnitude lower than concentrations in bald eagle eggs elsewhere in the United States. Key words: bald eagles, Haliaeetus leucocephalus, Alaska, breeding ecology, migration, contaminants RÉSUMÉ. On fait la synthèse de l’information disponible sur l’histoire naturelle, l’inventaire, la distribution et le statut du |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Robert J. Ritchie Skip Ambrose |
spellingShingle |
Robert J. Ritchie Skip Ambrose Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
author_facet |
Robert J. Ritchie Skip Ambrose |
author_sort |
Robert J. Ritchie |
title |
Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
title_short |
Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
title_full |
Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
title_fullStr |
Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
title_full_unstemmed |
Distribution and Population Status of Bald Eagles (Haliaeetus leucocephalus) in Interior Alaska |
title_sort |
distribution and population status of bald eagles (haliaeetus leucocephalus) in interior alaska |
publishDate |
1995 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.2514 http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
alaska range Arctic Kuskokwim Alaska Yukon |
genre_facet |
alaska range Arctic Kuskokwim Alaska Yukon |
op_source |
http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.2514 http://pubs.aina.ucalgary.ca/arctic/arctic49-2-120.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766191544284479488 |