Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape
Abstract Poor growth and survival in freshwater and marine environments have been implicated as responsible for Chinook salmon ( Oncorhynchus tshawytscha ) declines across Alaska. Lateral connectivity of river main stems with off‐channel habitats may play an integral role in sustaining Alaskan salmo...
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crwiley:10.1111/fwb.13232 2024-09-30T14:31:23+00:00 Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape Huntsman, Brock M. Falke, Jeffrey A. Alaska Department of Fish and Game 2019 http://dx.doi.org/10.1111/fwb.13232 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffwb.13232 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fwb.13232 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Freshwater Biology volume 64, issue 3, page 433-446 ISSN 0046-5070 1365-2427 journal-article 2019 crwiley https://doi.org/10.1111/fwb.13232 2024-09-17T04:49:32Z Abstract Poor growth and survival in freshwater and marine environments have been implicated as responsible for Chinook salmon ( Oncorhynchus tshawytscha ) declines across Alaska. Lateral connectivity of river main stems with off‐channel habitats may play an integral role in sustaining Alaskan salmonid populations because off‐channel habitats commonly provide greater growth opportunities than main stem habitats through greater macroinvertebrate productivity and warmer water temperatures. However, off‐channel habitats may impose greater mortality risks to juvenile salmonids, as these habitats are typically more susceptible to drying and are often occupied by potential predators. We used a hierarchical Bayesian count model to describe juvenile Chinook salmon distributions throughout the Chena River, Alaska in main stem and off‐channel habitats and employed diet, prey availability, and bioenergetic analyses to explain these habitat selection decisions from data collected in the summer of 2015. We found salmon to be most abundant in off‐channel habitats as summer temperature increased, which suggested that salmon dispersed to off‐channel habitats to take advantage of energetically favourable growth conditions as indicated by the higher prey biomass in benthic and diet samples collected within off‐channel habitats. Our results could have significant implications for juvenile salmon under a warming Alaskan climate as access to productive off‐channel habitats may be important to offset increased energetic costs as temperature warms. Article in Journal/Newspaper Arctic Alaska Wiley Online Library Arctic Freshwater Biology 64 3 433 446 |
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Wiley Online Library |
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English |
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Abstract Poor growth and survival in freshwater and marine environments have been implicated as responsible for Chinook salmon ( Oncorhynchus tshawytscha ) declines across Alaska. Lateral connectivity of river main stems with off‐channel habitats may play an integral role in sustaining Alaskan salmonid populations because off‐channel habitats commonly provide greater growth opportunities than main stem habitats through greater macroinvertebrate productivity and warmer water temperatures. However, off‐channel habitats may impose greater mortality risks to juvenile salmonids, as these habitats are typically more susceptible to drying and are often occupied by potential predators. We used a hierarchical Bayesian count model to describe juvenile Chinook salmon distributions throughout the Chena River, Alaska in main stem and off‐channel habitats and employed diet, prey availability, and bioenergetic analyses to explain these habitat selection decisions from data collected in the summer of 2015. We found salmon to be most abundant in off‐channel habitats as summer temperature increased, which suggested that salmon dispersed to off‐channel habitats to take advantage of energetically favourable growth conditions as indicated by the higher prey biomass in benthic and diet samples collected within off‐channel habitats. Our results could have significant implications for juvenile salmon under a warming Alaskan climate as access to productive off‐channel habitats may be important to offset increased energetic costs as temperature warms. |
author2 |
Alaska Department of Fish and Game |
format |
Article in Journal/Newspaper |
author |
Huntsman, Brock M. Falke, Jeffrey A. |
spellingShingle |
Huntsman, Brock M. Falke, Jeffrey A. Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
author_facet |
Huntsman, Brock M. Falke, Jeffrey A. |
author_sort |
Huntsman, Brock M. |
title |
Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
title_short |
Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
title_full |
Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
title_fullStr |
Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
title_full_unstemmed |
Main stem and off‐channel habitat use by juvenile Chinook salmon in a sub‐Arctic riverscape |
title_sort |
main stem and off‐channel habitat use by juvenile chinook salmon in a sub‐arctic riverscape |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/fwb.13232 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffwb.13232 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fwb.13232 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_source |
Freshwater Biology volume 64, issue 3, page 433-446 ISSN 0046-5070 1365-2427 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/fwb.13232 |
container_title |
Freshwater Biology |
container_volume |
64 |
container_issue |
3 |
container_start_page |
433 |
op_container_end_page |
446 |
_version_ |
1811635968383385600 |