Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds
Abstract Stable-isotope analyses of egg components can illuminate the contributions of endogenous and exogenous nutrients to egg formation in cases where birds move from one isotopic biome to another just before egg-laying, as in Red Knots (Calidris canutus islandica) and Ruddy Turnstones (Arenaria...
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Online Access: | http://dx.doi.org/10.1093/auk/121.2.333 http://academic.oup.com/auk/article-pdf/121/2/333/29687272/auk0333.pdf |
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croxfordunivpr:10.1093/auk/121.2.333 2024-09-15T17:54:39+00:00 Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds Morrison, R. I Guy Hobson, Keith A. Burger, A. E. 2004 http://dx.doi.org/10.1093/auk/121.2.333 http://academic.oup.com/auk/article-pdf/121/2/333/29687272/auk0333.pdf en eng Oxford University Press (OUP) The Auk volume 121, issue 2, page 333-344 ISSN 1938-4254 0004-8038 journal-article 2004 croxfordunivpr https://doi.org/10.1093/auk/121.2.333 2024-07-29T04:19:45Z Abstract Stable-isotope analyses of egg components can illuminate the contributions of endogenous and exogenous nutrients to egg formation in cases where birds move from one isotopic biome to another just before egg-laying, as in Red Knots (Calidris canutus islandica) and Ruddy Turnstones (Arenaria interpres interpres) nesting in the northeastern Canadian High Arctic. Those populations use inshore marine habitats during the winter and northward migration periods, but switch to feeding and breeding in terrestrial C-3 habitats in the Arctic. Upon the birds' arrival at Alert, Nunavut, Canada, stable carbon (δ13C) and nitrogen (δ15N) isotope values for their red blood cells were consistent with those expected from an inshore marine diet. After the birds switched to a terrestrial diet, those values decayed in a negative exponential fashion until they reached asymptotic values consistent with a local terrestrial C-3 diet. Components of eggs laid later in the season, including lipid-free yolk, albumen, yolk lipid, and albumen lipid, generally showed isotope values consistent with routing from exogenous (i.e. local) nutrient sources, which supports the notion that High Arctic shorebirds are primarily income and not capital breeders. However, eggs in earliest clutches were enriched in 13C and 15N, which suggests that some residual marine nutrients were available for reproduction. The extent to which endogenous stores are transferred to eggs in High Arctic shorebirds may depend on year and climatic conditions. Article in Journal/Newspaper Arenaria interpres Calidris canutus Nunavut Oxford University Press The Auk 121 2 333 344 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract Stable-isotope analyses of egg components can illuminate the contributions of endogenous and exogenous nutrients to egg formation in cases where birds move from one isotopic biome to another just before egg-laying, as in Red Knots (Calidris canutus islandica) and Ruddy Turnstones (Arenaria interpres interpres) nesting in the northeastern Canadian High Arctic. Those populations use inshore marine habitats during the winter and northward migration periods, but switch to feeding and breeding in terrestrial C-3 habitats in the Arctic. Upon the birds' arrival at Alert, Nunavut, Canada, stable carbon (δ13C) and nitrogen (δ15N) isotope values for their red blood cells were consistent with those expected from an inshore marine diet. After the birds switched to a terrestrial diet, those values decayed in a negative exponential fashion until they reached asymptotic values consistent with a local terrestrial C-3 diet. Components of eggs laid later in the season, including lipid-free yolk, albumen, yolk lipid, and albumen lipid, generally showed isotope values consistent with routing from exogenous (i.e. local) nutrient sources, which supports the notion that High Arctic shorebirds are primarily income and not capital breeders. However, eggs in earliest clutches were enriched in 13C and 15N, which suggests that some residual marine nutrients were available for reproduction. The extent to which endogenous stores are transferred to eggs in High Arctic shorebirds may depend on year and climatic conditions. |
author2 |
Burger, A. E. |
format |
Article in Journal/Newspaper |
author |
Morrison, R. I Guy Hobson, Keith A. |
spellingShingle |
Morrison, R. I Guy Hobson, Keith A. Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
author_facet |
Morrison, R. I Guy Hobson, Keith A. |
author_sort |
Morrison, R. I Guy |
title |
Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
title_short |
Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
title_full |
Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
title_fullStr |
Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
title_full_unstemmed |
Use of Body Stores in Shorebirds After Arrival on High-Arctic Breeding Grounds |
title_sort |
use of body stores in shorebirds after arrival on high-arctic breeding grounds |
publisher |
Oxford University Press (OUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1093/auk/121.2.333 http://academic.oup.com/auk/article-pdf/121/2/333/29687272/auk0333.pdf |
genre |
Arenaria interpres Calidris canutus Nunavut |
genre_facet |
Arenaria interpres Calidris canutus Nunavut |
op_source |
The Auk volume 121, issue 2, page 333-344 ISSN 1938-4254 0004-8038 |
op_doi |
https://doi.org/10.1093/auk/121.2.333 |
container_title |
The Auk |
container_volume |
121 |
container_issue |
2 |
container_start_page |
333 |
op_container_end_page |
344 |
_version_ |
1810430992082534400 |