Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds?
Abstract We examined changes in body composition of Red Knots (Calidris canutus islandica) following arrival on their High Arctic breeding grounds at Alert, Ellesmere Island, Canada. Knots arrived in late May and early June with large fat and muscle stores. In the next two weeks, fat and protein sto...
Published in: | The Condor |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2005
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/condor/107.2.449 http://academic.oup.com/condor/article-pdf/107/2/449/29713887/condor0449.pdf |
id |
croxfordunivpr:10.1093/condor/107.2.449 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/condor/107.2.449 2024-09-15T18:00:47+00:00 Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? Morrison, R. I Guy Davidson, Nick C. Piersma, Theunis 2005 http://dx.doi.org/10.1093/condor/107.2.449 http://academic.oup.com/condor/article-pdf/107/2/449/29713887/condor0449.pdf en eng Oxford University Press (OUP) The Condor volume 107, issue 2, page 449-457 ISSN 0010-5422 1938-5129 journal-article 2005 croxfordunivpr https://doi.org/10.1093/condor/107.2.449 2024-07-29T04:22:28Z Abstract We examined changes in body composition of Red Knots (Calidris canutus islandica) following arrival on their High Arctic breeding grounds at Alert, Ellesmere Island, Canada. Knots arrived in late May and early June with large fat and muscle stores. In the next two weeks, fat and protein stores (pectoral muscles) declined, while increases occurred in gizzard, proventriculus, gut length, heart, liver, and possibly gonads. Most stores were used before egg laying occurred and were therefore not available for egg formation. Early development of ova in some females suggests that body stores may be incorporated into the earliest eggs. While stores may be used for survival when conditions are difficult after arrival, their rapid loss and the concomitant increase in other organs suggests that a major function may be to facilitate a transformation from a physiological state suitable for migration to one suitable, and possibly required, for successful breeding. Transformaciones a Altas Latitudes: ¿Por qué Calidris canutus islandica Lleva Reservas Corporales a los Sitios de Nidificación? Resumen. Examinamos los cambios en la condición corporal de individuos de Calidris canutus islandica luego de que éstos llegaran a sus territorios reproductivos a altas latitudes en el Ártico en Alert, isla Ellesmere, Canadá. Los individuos de C. c. islandica llegaron a fines de mayo y comienzos de junio con grandes reservas de grasa y músculo. Durante las dos semanas siguientes, las reservas de grasa y proteína (músculos pectorales) disminuyeron, mientras que la molleja, los proventrículos, el largo del intestino, el hígado y posiblemente las gónadas aumentaron de tamaño. La mayoría de las reservas fueron usadas antes del período de puesta de huevos, por lo que éstas no estuvieron disponibles para la formación de los huevos. En algunas hembras, el desarrollo temprano de los óvulos sugiere que las reservas corporales pueden ser incorporadas en los primeros huevos. Si bien las reservas pueden ser usadas para sobrevivir en el momento ... Article in Journal/Newspaper Calidris canutus Ellesmere Island Oxford University Press The Condor 107 2 449 457 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
Abstract We examined changes in body composition of Red Knots (Calidris canutus islandica) following arrival on their High Arctic breeding grounds at Alert, Ellesmere Island, Canada. Knots arrived in late May and early June with large fat and muscle stores. In the next two weeks, fat and protein stores (pectoral muscles) declined, while increases occurred in gizzard, proventriculus, gut length, heart, liver, and possibly gonads. Most stores were used before egg laying occurred and were therefore not available for egg formation. Early development of ova in some females suggests that body stores may be incorporated into the earliest eggs. While stores may be used for survival when conditions are difficult after arrival, their rapid loss and the concomitant increase in other organs suggests that a major function may be to facilitate a transformation from a physiological state suitable for migration to one suitable, and possibly required, for successful breeding. Transformaciones a Altas Latitudes: ¿Por qué Calidris canutus islandica Lleva Reservas Corporales a los Sitios de Nidificación? Resumen. Examinamos los cambios en la condición corporal de individuos de Calidris canutus islandica luego de que éstos llegaran a sus territorios reproductivos a altas latitudes en el Ártico en Alert, isla Ellesmere, Canadá. Los individuos de C. c. islandica llegaron a fines de mayo y comienzos de junio con grandes reservas de grasa y músculo. Durante las dos semanas siguientes, las reservas de grasa y proteína (músculos pectorales) disminuyeron, mientras que la molleja, los proventrículos, el largo del intestino, el hígado y posiblemente las gónadas aumentaron de tamaño. La mayoría de las reservas fueron usadas antes del período de puesta de huevos, por lo que éstas no estuvieron disponibles para la formación de los huevos. En algunas hembras, el desarrollo temprano de los óvulos sugiere que las reservas corporales pueden ser incorporadas en los primeros huevos. Si bien las reservas pueden ser usadas para sobrevivir en el momento ... |
format |
Article in Journal/Newspaper |
author |
Morrison, R. I Guy Davidson, Nick C. Piersma, Theunis |
spellingShingle |
Morrison, R. I Guy Davidson, Nick C. Piersma, Theunis Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
author_facet |
Morrison, R. I Guy Davidson, Nick C. Piersma, Theunis |
author_sort |
Morrison, R. I Guy |
title |
Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
title_short |
Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
title_full |
Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
title_fullStr |
Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
title_full_unstemmed |
Transformations at High Latitudes: Why do Red Knots Bring Body Stores to the Breeding Grounds? |
title_sort |
transformations at high latitudes: why do red knots bring body stores to the breeding grounds? |
publisher |
Oxford University Press (OUP) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1093/condor/107.2.449 http://academic.oup.com/condor/article-pdf/107/2/449/29713887/condor0449.pdf |
genre |
Calidris canutus Ellesmere Island |
genre_facet |
Calidris canutus Ellesmere Island |
op_source |
The Condor volume 107, issue 2, page 449-457 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/107.2.449 |
container_title |
The Condor |
container_volume |
107 |
container_issue |
2 |
container_start_page |
449 |
op_container_end_page |
457 |
_version_ |
1810437945675481088 |