Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin.
Upriver movements were determined for Chinook salmon Oncorhynchus tshawytscha returning to the Yukon River, a large, virtually pristine river basin. These returns have declined dramatically since the late 1990s, and information is needed to better manage the run and facilitate conservation efforts....
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ftdoajarticles:oai:doaj.org/article:1ebfa436137240a6ac247767773b9adc 2023-05-15T18:45:58+02:00 Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. John H Eiler Allison N Evans Carl B Schreck 2014-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0123127 https://doaj.org/article/1ebfa436137240a6ac247767773b9adc EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4412830?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0123127 https://doaj.org/article/1ebfa436137240a6ac247767773b9adc PLoS ONE, Vol 10, Iss 4, p e0123127 (2014) Medicine R Science Q article 2014 ftdoajarticles https://doi.org/10.1371/journal.pone.0123127 2022-12-31T15:35:48Z Upriver movements were determined for Chinook salmon Oncorhynchus tshawytscha returning to the Yukon River, a large, virtually pristine river basin. These returns have declined dramatically since the late 1990s, and information is needed to better manage the run and facilitate conservation efforts. A total of 2,860 fish were radio tagged during 2002-2004. Most (97.5%) of the fish tracked upriver to spawning areas displayed continual upriver movements and strong fidelity to the terminal tributaries entered. Movement rates were substantially slower for fish spawning in lower river tributaries (28-40 km d-1) compared to upper basin stocks (52-62 km d-1). Three distinct migratory patterns were observed, including a gradual decline, pronounced decline, and substantial increase in movement rate as the fish moved upriver. Stocks destined for the same region exhibited similar migratory patterns. Individual fish within a stock showed substantial variation, but tended to reflect the regional pattern. Differences between consistently faster and slower fish explained 74% of the within-stock variation, whereas relative shifts in sequential movement rates between "hares" (faster fish becoming slower) and "tortoises" (slow but steady fish) explained 22% of the variation. Pulses of fish moving upriver were not cohesive. Fish tagged over a 4-day period took 16 days to pass a site 872 km upriver. Movement rates were substantially faster and the percentage of atypical movements considerably less than reported in more southerly drainages, but may reflect the pristine conditions within the Yukon River, wild origins of the fish, and discrete run timing of the returns. Movement data can provide numerous insights into the status and management of salmon returns, particularly in large river drainages with widely scattered fisheries where management actions in the lower river potentially impact harvests and escapement farther upstream. However, the substantial variation exhibited among individual fish within a stock can complicate these ... Article in Journal/Newspaper Yukon river Yukon Directory of Open Access Journals: DOAJ Articles Yukon PLOS ONE 10 4 e0123127 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q John H Eiler Allison N Evans Carl B Schreck Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
topic_facet |
Medicine R Science Q |
description |
Upriver movements were determined for Chinook salmon Oncorhynchus tshawytscha returning to the Yukon River, a large, virtually pristine river basin. These returns have declined dramatically since the late 1990s, and information is needed to better manage the run and facilitate conservation efforts. A total of 2,860 fish were radio tagged during 2002-2004. Most (97.5%) of the fish tracked upriver to spawning areas displayed continual upriver movements and strong fidelity to the terminal tributaries entered. Movement rates were substantially slower for fish spawning in lower river tributaries (28-40 km d-1) compared to upper basin stocks (52-62 km d-1). Three distinct migratory patterns were observed, including a gradual decline, pronounced decline, and substantial increase in movement rate as the fish moved upriver. Stocks destined for the same region exhibited similar migratory patterns. Individual fish within a stock showed substantial variation, but tended to reflect the regional pattern. Differences between consistently faster and slower fish explained 74% of the within-stock variation, whereas relative shifts in sequential movement rates between "hares" (faster fish becoming slower) and "tortoises" (slow but steady fish) explained 22% of the variation. Pulses of fish moving upriver were not cohesive. Fish tagged over a 4-day period took 16 days to pass a site 872 km upriver. Movement rates were substantially faster and the percentage of atypical movements considerably less than reported in more southerly drainages, but may reflect the pristine conditions within the Yukon River, wild origins of the fish, and discrete run timing of the returns. Movement data can provide numerous insights into the status and management of salmon returns, particularly in large river drainages with widely scattered fisheries where management actions in the lower river potentially impact harvests and escapement farther upstream. However, the substantial variation exhibited among individual fish within a stock can complicate these ... |
format |
Article in Journal/Newspaper |
author |
John H Eiler Allison N Evans Carl B Schreck |
author_facet |
John H Eiler Allison N Evans Carl B Schreck |
author_sort |
John H Eiler |
title |
Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
title_short |
Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
title_full |
Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
title_fullStr |
Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
title_full_unstemmed |
Migratory Patterns of Wild Chinook Salmon Oncorhynchus tshawytscha Returning to a Large, Free-Flowing River Basin. |
title_sort |
migratory patterns of wild chinook salmon oncorhynchus tshawytscha returning to a large, free-flowing river basin. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2014 |
url |
https://doi.org/10.1371/journal.pone.0123127 https://doaj.org/article/1ebfa436137240a6ac247767773b9adc |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Yukon river Yukon |
genre_facet |
Yukon river Yukon |
op_source |
PLoS ONE, Vol 10, Iss 4, p e0123127 (2014) |
op_relation |
http://europepmc.org/articles/PMC4412830?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0123127 https://doaj.org/article/1ebfa436137240a6ac247767773b9adc |
op_doi |
https://doi.org/10.1371/journal.pone.0123127 |
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PLOS ONE |
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10 |
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e0123127 |
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