Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures
Stream temperature is a key driver of physiological function in ectothermic fish, and fish have clear upper and lower limits to thermal habitat use. Stream temperature increases from climate change are a major threat to coldwater taxa like Athabasca Rainbow Trout (Oncorhynchus mykiss), listed as End...
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| Language: | English |
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Canadian Science Publishing
2025-01-01
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| Series: | FACETS |
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| Online Access: | https://facetsjournal.com/doi/10.1139/facets-2023-0241 |
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| author | Sarah Hnytka Jordan Rosenfeld Eva C. Enders |
| author_facet | Sarah Hnytka Jordan Rosenfeld Eva C. Enders |
| author_sort | Sarah Hnytka |
| collection | DOAJ |
| description | Stream temperature is a key driver of physiological function in ectothermic fish, and fish have clear upper and lower limits to thermal habitat use. Stream temperature increases from climate change are a major threat to coldwater taxa like Athabasca Rainbow Trout (Oncorhynchus mykiss), listed as Endangered under Canada's Species at Risk Act. To better understand their vulnerability to climate change and prioritize recovery locations, Athabasca Rainbow Trout were collected in August 2021 from three streams in the upper Athabasca River, Alberta, Canada, across a gradient of thermal regimes ranging from cold to warm. Individual thermal tolerance was measured using two physiological metrics: agitation temperature (Tag) and critical thermal maxima (CTmax) using a portable streamside laboratory. Tag is a behavioural indicator of a thermal avoidance threshold, whereas CTmax is a physiological response that can be interpreted as the upper thermal limit where long term survival is reduced. Results provide strong evidence that CTmax is a plastic metric in Athabasca Rainbow Trout; however, Tag is not. This suggests that Athabasca Rainbow Trout demonstrate some thermal plasticity in terms of CTmax, yet the lack of plasticity in Tag indicates potential limitations in their adaptability to warming stream temperatures. |
| format | Article |
| id | doaj-art-b8d776abe7e446faa3e044a68fa35c49 |
| institution | OA Journals |
| issn | 2371-1671 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Canadian Science Publishing |
| record_format | Article |
| series | FACETS |
| spelling | doaj-art-b8d776abe7e446faa3e044a68fa35c492025-08-20T02:31:44ZengCanadian Science PublishingFACETS2371-16712025-01-011011110.1139/facets-2023-0241Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperaturesSarah Hnytka0Jordan Rosenfeld1Eva C. Enders2Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, Manitoba R3T 2N6, CanadaMinistry of Environment, Vancouver, Vancouver, BC, CanadaInstitut national de la recherche scientifique, Quebec City, Quebec G1K 9A9, CanadaStream temperature is a key driver of physiological function in ectothermic fish, and fish have clear upper and lower limits to thermal habitat use. Stream temperature increases from climate change are a major threat to coldwater taxa like Athabasca Rainbow Trout (Oncorhynchus mykiss), listed as Endangered under Canada's Species at Risk Act. To better understand their vulnerability to climate change and prioritize recovery locations, Athabasca Rainbow Trout were collected in August 2021 from three streams in the upper Athabasca River, Alberta, Canada, across a gradient of thermal regimes ranging from cold to warm. Individual thermal tolerance was measured using two physiological metrics: agitation temperature (Tag) and critical thermal maxima (CTmax) using a portable streamside laboratory. Tag is a behavioural indicator of a thermal avoidance threshold, whereas CTmax is a physiological response that can be interpreted as the upper thermal limit where long term survival is reduced. Results provide strong evidence that CTmax is a plastic metric in Athabasca Rainbow Trout; however, Tag is not. This suggests that Athabasca Rainbow Trout demonstrate some thermal plasticity in terms of CTmax, yet the lack of plasticity in Tag indicates potential limitations in their adaptability to warming stream temperatures.https://facetsjournal.com/doi/10.1139/facets-2023-0241critical thermal maximaagitation temperaturethermal physiologyAthabasca Rainbow Troutstreamside laboratoryclimate change |
| spellingShingle | Sarah Hnytka Jordan Rosenfeld Eva C. Enders Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures FACETS critical thermal maxima agitation temperature thermal physiology Athabasca Rainbow Trout streamside laboratory climate change |
| title | Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures |
| title_full | Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures |
| title_fullStr | Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures |
| title_full_unstemmed | Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures |
| title_short | Determining the upper thermal tolerance of Athabasca Rainbow Trout (Oncorhynchus mykiss) across naturally varying stream temperatures |
| title_sort | determining the upper thermal tolerance of athabasca rainbow trout oncorhynchus mykiss across naturally varying stream temperatures |
| topic | critical thermal maxima agitation temperature thermal physiology Athabasca Rainbow Trout streamside laboratory climate change |
| url | https://facetsjournal.com/doi/10.1139/facets-2023-0241 |
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