Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska
The time—activity budget of breeding Calidris pusilla was studied at Barrow, Alaska USA, in 1973 by observing several individually marked birds. Feeding, incubating and young—attending were the most time—consuming activities: °70% and 80% of the time was spent feeding by the female during laying per...
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Online Access: | http://dx.doi.org/10.2307/1936615 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1936615 |
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crwiley:10.2307/1936615 2024-09-15T17:58:14+00:00 Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska Ashkenazie, Shoshana Safriel, Uriel N. 1979 http://dx.doi.org/10.2307/1936615 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1936615 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology volume 60, issue 4, page 783-799 ISSN 0012-9658 1939-9170 journal-article 1979 crwiley https://doi.org/10.2307/1936615 2024-08-13T04:17:03Z The time—activity budget of breeding Calidris pusilla was studied at Barrow, Alaska USA, in 1973 by observing several individually marked birds. Feeding, incubating and young—attending were the most time—consuming activities: °70% and 80% of the time was spent feeding by the female during laying period by both sexes prior to southbound migration, respectively. Up to 50% of the time was spent incubating or attending young during the incubation the young—attending periods. The time—activity budget was converted into an estimate of energy requirements by using available estimates for energetic cost of activities. Although both environmental conditions and activity patterns changed throughout the season, the daily energetic cost fluctuated between only 159 kJ/d during the prelaying stage and 222 kJ/d during the laying stage for the female, and between 155 kJ/d during the prelaying stage and 167 kJ/d during the territorial stage for the male. But because females leave the area about the time of hatching, a female requires less energy from the tundra than a male; on the average, °7.1 x 10 3 and 8.0 x 10 3 kJ were required during the whole season by female and male, respectively. Energy uptake was estimated by: (a) using available data on diet composition, the energy content of prey items and their digestibility, and (b) combining them with observed feeding rates and estimated capture rates. The resultant energy budget was generally negative for the whole season and, indeed, female weights declined significantly. We conclude that either energy uptake was underestimated or the birds rely heavily upon resources obtained at wintering grounds and during migration prior to arrival at Barrow. We suggest that females, having an average daily energy requirement 15° higher than males, and entering the young—attending stage with an accumulated energy deficit, increase their fitness by deserting to better feeding grounds rather than staying with the young after they hatch. Thus females enhance their own survival to the next ... Article in Journal/Newspaper Barrow Tundra Alaska Wiley Online Library Ecology 60 4 783 799 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The time—activity budget of breeding Calidris pusilla was studied at Barrow, Alaska USA, in 1973 by observing several individually marked birds. Feeding, incubating and young—attending were the most time—consuming activities: °70% and 80% of the time was spent feeding by the female during laying period by both sexes prior to southbound migration, respectively. Up to 50% of the time was spent incubating or attending young during the incubation the young—attending periods. The time—activity budget was converted into an estimate of energy requirements by using available estimates for energetic cost of activities. Although both environmental conditions and activity patterns changed throughout the season, the daily energetic cost fluctuated between only 159 kJ/d during the prelaying stage and 222 kJ/d during the laying stage for the female, and between 155 kJ/d during the prelaying stage and 167 kJ/d during the territorial stage for the male. But because females leave the area about the time of hatching, a female requires less energy from the tundra than a male; on the average, °7.1 x 10 3 and 8.0 x 10 3 kJ were required during the whole season by female and male, respectively. Energy uptake was estimated by: (a) using available data on diet composition, the energy content of prey items and their digestibility, and (b) combining them with observed feeding rates and estimated capture rates. The resultant energy budget was generally negative for the whole season and, indeed, female weights declined significantly. We conclude that either energy uptake was underestimated or the birds rely heavily upon resources obtained at wintering grounds and during migration prior to arrival at Barrow. We suggest that females, having an average daily energy requirement 15° higher than males, and entering the young—attending stage with an accumulated energy deficit, increase their fitness by deserting to better feeding grounds rather than staying with the young after they hatch. Thus females enhance their own survival to the next ... |
format |
Article in Journal/Newspaper |
author |
Ashkenazie, Shoshana Safriel, Uriel N. |
spellingShingle |
Ashkenazie, Shoshana Safriel, Uriel N. Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
author_facet |
Ashkenazie, Shoshana Safriel, Uriel N. |
author_sort |
Ashkenazie, Shoshana |
title |
Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
title_short |
Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
title_full |
Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
title_fullStr |
Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
title_full_unstemmed |
Time‐Energy Budget of the Semipalmated Sandpiper Calidris Pusilla at Barrow, Alaska |
title_sort |
time‐energy budget of the semipalmated sandpiper calidris pusilla at barrow, alaska |
publisher |
Wiley |
publishDate |
1979 |
url |
http://dx.doi.org/10.2307/1936615 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1936615 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1936615 |
genre |
Barrow Tundra Alaska |
genre_facet |
Barrow Tundra Alaska |
op_source |
Ecology volume 60, issue 4, page 783-799 ISSN 0012-9658 1939-9170 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/1936615 |
container_title |
Ecology |
container_volume |
60 |
container_issue |
4 |
container_start_page |
783 |
op_container_end_page |
799 |
_version_ |
1810434628137254912 |