Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival
We investigated the ecology of juvenile stream-type chinook salmon (Oncorhynchus tshawytscha) in Croucher Creek, a small non-natal tributary of the upper Yukon River, in 1998 and 1999. Underyearling (age 0+) salmon enter Croucher Creek from the Yukon River in June, and by midsummer reached an averag...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | French |
Published: |
Canadian Science Publishing
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/z01-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-165 |
id |
crcansciencepubl:10.1139/z01-165 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/z01-165 2024-04-07T07:56:27+00:00 Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival Bradford, Michael J Grout, Jeff A Moodie, Sue 2001 http://dx.doi.org/10.1139/z01-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-165 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 79, issue 11, page 2043-2054 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2001 crcansciencepubl https://doi.org/10.1139/z01-165 2024-03-08T00:37:47Z We investigated the ecology of juvenile stream-type chinook salmon (Oncorhynchus tshawytscha) in Croucher Creek, a small non-natal tributary of the upper Yukon River, in 1998 and 1999. Underyearling (age 0+) salmon enter Croucher Creek from the Yukon River in June, and by midsummer reached an average density of >0.5/m 2 . Fish were most commonly found in small pools. Their mean size increased until the end of August, but growth virtually ceased after that, when water temperatures fell. Juveniles remained in the stream through winter, and their distribution and survival were strongly influenced by aufeis, a thick layer of ice that develops from the freezing of groundwater. Over-winter survival was not dependent on fish size. Those fish that survived the winter grew rapidly and doubled in body mass in the spring. About 900 yearling fish emigrated from Croucher Creek in late June and early July at a mean length of 89 mm and mass of 7.2 g. Most of the migrants overwintered in a 700 m long reach of the creek that was downstream from groundwater sources and did not experience severe icing conditions. We suggest that small streams may be important habitats for juvenile salmon in the Yukon drainage, especially if there is a year-round source of groundwater flow that creates conditions suitable for overwintering. Article in Journal/Newspaper Yukon river Yukon Canadian Science Publishing Yukon Croucher Creek ENVELOPE(-135.080,-135.080,60.780,60.780) Canadian Journal of Zoology 79 11 2043 2054 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
French |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Bradford, Michael J Grout, Jeff A Moodie, Sue Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
We investigated the ecology of juvenile stream-type chinook salmon (Oncorhynchus tshawytscha) in Croucher Creek, a small non-natal tributary of the upper Yukon River, in 1998 and 1999. Underyearling (age 0+) salmon enter Croucher Creek from the Yukon River in June, and by midsummer reached an average density of >0.5/m 2 . Fish were most commonly found in small pools. Their mean size increased until the end of August, but growth virtually ceased after that, when water temperatures fell. Juveniles remained in the stream through winter, and their distribution and survival were strongly influenced by aufeis, a thick layer of ice that develops from the freezing of groundwater. Over-winter survival was not dependent on fish size. Those fish that survived the winter grew rapidly and doubled in body mass in the spring. About 900 yearling fish emigrated from Croucher Creek in late June and early July at a mean length of 89 mm and mass of 7.2 g. Most of the migrants overwintered in a 700 m long reach of the creek that was downstream from groundwater sources and did not experience severe icing conditions. We suggest that small streams may be important habitats for juvenile salmon in the Yukon drainage, especially if there is a year-round source of groundwater flow that creates conditions suitable for overwintering. |
format |
Article in Journal/Newspaper |
author |
Bradford, Michael J Grout, Jeff A Moodie, Sue |
author_facet |
Bradford, Michael J Grout, Jeff A Moodie, Sue |
author_sort |
Bradford, Michael J |
title |
Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
title_short |
Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
title_full |
Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
title_fullStr |
Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
title_full_unstemmed |
Ecology of juvenile chinook salmon in a small non-natal stream of the Yukon River drainage and the role of ice conditions on their distribution and survival |
title_sort |
ecology of juvenile chinook salmon in a small non-natal stream of the yukon river drainage and the role of ice conditions on their distribution and survival |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/z01-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-165 |
long_lat |
ENVELOPE(-135.080,-135.080,60.780,60.780) |
geographic |
Yukon Croucher Creek |
geographic_facet |
Yukon Croucher Creek |
genre |
Yukon river Yukon |
genre_facet |
Yukon river Yukon |
op_source |
Canadian Journal of Zoology volume 79, issue 11, page 2043-2054 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z01-165 |
container_title |
Canadian Journal of Zoology |
container_volume |
79 |
container_issue |
11 |
container_start_page |
2043 |
op_container_end_page |
2054 |
_version_ |
1795674373487591424 |