Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska
ABSTRACT. Reproductive success and foraging effort of Pacific loons (Gavia pacifica) were compared between impoundments and natural ponds in the Prudhoe Bay oil field, Alaska, in 1992 and 1993. Pacific loons successfully reproduced on both impoundments and ponds. Though success tended to be lower on...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.587.1213 2023-05-15T13:19:51+02:00 Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska Kenneth Kertell The Pennsylvania State University CiteSeerX Archives 1996 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.587.1213 http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.587.1213 http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf text 1996 ftciteseerx 2016-01-08T13:18:22Z ABSTRACT. Reproductive success and foraging effort of Pacific loons (Gavia pacifica) were compared between impoundments and natural ponds in the Prudhoe Bay oil field, Alaska, in 1992 and 1993. Pacific loons successfully reproduced on both impoundments and ponds. Though success tended to be lower on impoundments, no significant differences were detected between the two water body types. The principal cause of reproductive failure on both impoundments and ponds in 1993 appears to have been predation by arctic foxes (Alopex lagopus) during incubation. Predation losses on impoundments often were associated with large water-level drawdowns, which apparently increased opportunities for predation of stranded clutches. I found no differences in chick mortality or adult foraging effort between impoundments and ponds. Over 99 % of the prey items delivered to chicks were invertebrates captured in freshwater wetlands. Reproductive output of Pacific loons may be improved by increasing the stability of water levels at impoundments used for nesting. I found no evidence that draining impoundments would improve habitat for loons (or invertebrate-eating waterfowl species) at Prudhoe Bay. Key words: Pacific loon, Gavia pacifica, Prudhoe Bay, impoundments, impact assessment, Alaska RÉSUMÉ. En 1992 et 1993, on a établi une comparaison du taux de réussite de la reproduction et de la quête de nourriture du huart du Pacifique (Gavia pacifica) entre les bassins de retenue et les étangs naturels situés dans le champ pétrolifère de Prudhoe Bay Text Alopex lagopus Arctic Arctic Prudhoe Bay Alaska Unknown Arctic Pacific |
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ftciteseerx |
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English |
description |
ABSTRACT. Reproductive success and foraging effort of Pacific loons (Gavia pacifica) were compared between impoundments and natural ponds in the Prudhoe Bay oil field, Alaska, in 1992 and 1993. Pacific loons successfully reproduced on both impoundments and ponds. Though success tended to be lower on impoundments, no significant differences were detected between the two water body types. The principal cause of reproductive failure on both impoundments and ponds in 1993 appears to have been predation by arctic foxes (Alopex lagopus) during incubation. Predation losses on impoundments often were associated with large water-level drawdowns, which apparently increased opportunities for predation of stranded clutches. I found no differences in chick mortality or adult foraging effort between impoundments and ponds. Over 99 % of the prey items delivered to chicks were invertebrates captured in freshwater wetlands. Reproductive output of Pacific loons may be improved by increasing the stability of water levels at impoundments used for nesting. I found no evidence that draining impoundments would improve habitat for loons (or invertebrate-eating waterfowl species) at Prudhoe Bay. Key words: Pacific loon, Gavia pacifica, Prudhoe Bay, impoundments, impact assessment, Alaska RÉSUMÉ. En 1992 et 1993, on a établi une comparaison du taux de réussite de la reproduction et de la quête de nourriture du huart du Pacifique (Gavia pacifica) entre les bassins de retenue et les étangs naturels situés dans le champ pétrolifère de Prudhoe Bay |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Kenneth Kertell |
spellingShingle |
Kenneth Kertell Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
author_facet |
Kenneth Kertell |
author_sort |
Kenneth Kertell |
title |
Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
title_short |
Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
title_full |
Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
title_fullStr |
Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
title_full_unstemmed |
Response of Pacific Loons (Gavia pacifica) to Impoundments at Prudhoe Bay, Alaska |
title_sort |
response of pacific loons (gavia pacifica) to impoundments at prudhoe bay, alaska |
publishDate |
1996 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.587.1213 http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Alopex lagopus Arctic Arctic Prudhoe Bay Alaska |
genre_facet |
Alopex lagopus Arctic Arctic Prudhoe Bay Alaska |
op_source |
http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.587.1213 http://pubs.aina.ucalgary.ca/arctic/arctic49-4-356.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766349946676576256 |