Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho
This study documented the nesting chronology, productivity, and nestling growth of northern goshawks in west-central Idaho in 1998 and 1999. Egg laying began in late April, and fledging occurred in mid-July. Goshawks used >35% of historical territories and eleven new territories were discovered....
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ftboisestateu:oai:scholarworks.boisestate.edu:bio_facpubs-1321 2023-10-29T02:38:55+01:00 Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho Hanauska-Brown, Lauri A. Bechard, Marc J. Roloff, Gary J. 2003-01-01T08:00:00Z https://scholarworks.boisestate.edu/bio_facpubs/322 unknown ScholarWorks https://scholarworks.boisestate.edu/bio_facpubs/322 Biology Faculty Publications and Presentations Biology text 2003 ftboisestateu 2023-09-29T15:10:34Z This study documented the nesting chronology, productivity, and nestling growth of northern goshawks in west-central Idaho in 1998 and 1999. Egg laying began in late April, and fledging occurred in mid-July. Goshawks used >35% of historical territories and eleven new territories were discovered. Of 46 occupied territories, 80% were successful, fledging one to four young. Productivity averaged 2.1 fledglings/successful nest in 1998 and 2.0 fledglings/successful nest in 1999. Failure rates were similar between years; 17% of occupied territories failed in 1998 and 21% failed in 1999. We also measured nestling growth, a variable not previously reported for goshawks in any northwestern studies. Time for nestlings to grow from 10 to 90% of their fledging mass ranged from 16 to 35 days and their growth-rate constants, k, ranged from 0.13 to 0.27. Nestling growth rates were similar within nests, but varied among nests. The fastest mean growth at a nest was 17 days to reach 90% of fledging mass, while the slowest mean growth was 33 days to reach 90% of fledging mass. Variability in growth among nests suggested there were differences in energy intake by nestlings, potentially due to adult condition or habitat quality. Nestling growth may be a valuable indicator of habitat quality and adult breeding condition during the nestling stage. In contrast, productivity (as defined in this study) can be viewed as a more encompassing expression of habitat quality including quality of the adult winter range and breeding habitat. Text Northern Goshawk Boise State University: Scholar Works |
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Boise State University: Scholar Works |
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Biology |
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Biology Hanauska-Brown, Lauri A. Bechard, Marc J. Roloff, Gary J. Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
topic_facet |
Biology |
description |
This study documented the nesting chronology, productivity, and nestling growth of northern goshawks in west-central Idaho in 1998 and 1999. Egg laying began in late April, and fledging occurred in mid-July. Goshawks used >35% of historical territories and eleven new territories were discovered. Of 46 occupied territories, 80% were successful, fledging one to four young. Productivity averaged 2.1 fledglings/successful nest in 1998 and 2.0 fledglings/successful nest in 1999. Failure rates were similar between years; 17% of occupied territories failed in 1998 and 21% failed in 1999. We also measured nestling growth, a variable not previously reported for goshawks in any northwestern studies. Time for nestlings to grow from 10 to 90% of their fledging mass ranged from 16 to 35 days and their growth-rate constants, k, ranged from 0.13 to 0.27. Nestling growth rates were similar within nests, but varied among nests. The fastest mean growth at a nest was 17 days to reach 90% of fledging mass, while the slowest mean growth was 33 days to reach 90% of fledging mass. Variability in growth among nests suggested there were differences in energy intake by nestlings, potentially due to adult condition or habitat quality. Nestling growth may be a valuable indicator of habitat quality and adult breeding condition during the nestling stage. In contrast, productivity (as defined in this study) can be viewed as a more encompassing expression of habitat quality including quality of the adult winter range and breeding habitat. |
format |
Text |
author |
Hanauska-Brown, Lauri A. Bechard, Marc J. Roloff, Gary J. |
author_facet |
Hanauska-Brown, Lauri A. Bechard, Marc J. Roloff, Gary J. |
author_sort |
Hanauska-Brown, Lauri A. |
title |
Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
title_short |
Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
title_full |
Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
title_fullStr |
Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
title_full_unstemmed |
Northern Goshawk Breeding Ecology and Nestling Growth in Mixed Coniferous Forests of West-Central ldaho |
title_sort |
northern goshawk breeding ecology and nestling growth in mixed coniferous forests of west-central ldaho |
publisher |
ScholarWorks |
publishDate |
2003 |
url |
https://scholarworks.boisestate.edu/bio_facpubs/322 |
genre |
Northern Goshawk |
genre_facet |
Northern Goshawk |
op_source |
Biology Faculty Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/bio_facpubs/322 |
_version_ |
1781065373527834624 |