Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures
Abstract Anthropogenic influences, including climate change, are increasing river temperatures in northern and temperate regions and threatening the thermal habitats of native salmonids. When river temperatures exceed the tolerance levels of brook trout and Atlantic salmon, individuals exhibit behav...
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crwiley:10.1002/rra.3570 2024-09-09T19:30:27+00:00 Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures Wilbur, Nathan M. O'Sullivan, Antóin M. MacQuarrie, Kerry T. B. Linnansaari, Tommi Curry, R. Allen Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada 2020 http://dx.doi.org/10.1002/rra.3570 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.3570 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3570 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3570 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor River Research and Applications volume 36, issue 5, page 769-783 ISSN 1535-1459 1535-1467 journal-article 2020 crwiley https://doi.org/10.1002/rra.3570 2024-08-27T04:29:07Z Abstract Anthropogenic influences, including climate change, are increasing river temperatures in northern and temperate regions and threatening the thermal habitats of native salmonids. When river temperatures exceed the tolerance levels of brook trout and Atlantic salmon, individuals exhibit behavioural thermoregulation by seeking out cold‐water refugia – often created by tributaries and groundwater discharge. Thermal infrared (TIR) imagery was used to map cold‐water anomalies along a 53 km reach of the Cains River, New Brunswick. Trout and salmon parr did not use all identified thermal anomalies as refugia during higher river temperature periods (>21°C). Most small‐bodied trout (8–30 cm) were observed in 80% of the thermal anomalies sampled. Large‐bodied trout (>35 cm) required a more specific set of physical habitat conditions for suitable refugia, that is, 100% of observed large trout used 30% of the anomalies sampled and required water depths >65 cm within or adjacent to the anomaly. Densities of trout were significantly higher within anomalies compared with areas of ambient river temperature. Salmon parr were less aligned with thermal anomalies at the observed temperatures, that is, 59% were found in 65% of the sampled anomalies; and densities were not significantly different within/ outside anomalies. Salmon parr appeared to aggregate at 27°C, and after several events over 27°C variability in aggregation behaviour was observed – some fish aggregated at 25°C, others did not. We stipulate this is due to variances of thermal fatigue. Habitat suitability curves were developed for velocity, temperature, depth, substrate, and deep water availability to characterize conditions preferred by fish during high‐temperature events. These findings are useful for managers as our climate warms, and can potentially be used as a tool to help conserve and enhance thermal refugia for brook trout and Atlantic salmon in similar systems. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library River Research and Applications 36 5 769 783 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Anthropogenic influences, including climate change, are increasing river temperatures in northern and temperate regions and threatening the thermal habitats of native salmonids. When river temperatures exceed the tolerance levels of brook trout and Atlantic salmon, individuals exhibit behavioural thermoregulation by seeking out cold‐water refugia – often created by tributaries and groundwater discharge. Thermal infrared (TIR) imagery was used to map cold‐water anomalies along a 53 km reach of the Cains River, New Brunswick. Trout and salmon parr did not use all identified thermal anomalies as refugia during higher river temperature periods (>21°C). Most small‐bodied trout (8–30 cm) were observed in 80% of the thermal anomalies sampled. Large‐bodied trout (>35 cm) required a more specific set of physical habitat conditions for suitable refugia, that is, 100% of observed large trout used 30% of the anomalies sampled and required water depths >65 cm within or adjacent to the anomaly. Densities of trout were significantly higher within anomalies compared with areas of ambient river temperature. Salmon parr were less aligned with thermal anomalies at the observed temperatures, that is, 59% were found in 65% of the sampled anomalies; and densities were not significantly different within/ outside anomalies. Salmon parr appeared to aggregate at 27°C, and after several events over 27°C variability in aggregation behaviour was observed – some fish aggregated at 25°C, others did not. We stipulate this is due to variances of thermal fatigue. Habitat suitability curves were developed for velocity, temperature, depth, substrate, and deep water availability to characterize conditions preferred by fish during high‐temperature events. These findings are useful for managers as our climate warms, and can potentially be used as a tool to help conserve and enhance thermal refugia for brook trout and Atlantic salmon in similar systems. |
author2 |
Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Wilbur, Nathan M. O'Sullivan, Antóin M. MacQuarrie, Kerry T. B. Linnansaari, Tommi Curry, R. Allen |
spellingShingle |
Wilbur, Nathan M. O'Sullivan, Antóin M. MacQuarrie, Kerry T. B. Linnansaari, Tommi Curry, R. Allen Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
author_facet |
Wilbur, Nathan M. O'Sullivan, Antóin M. MacQuarrie, Kerry T. B. Linnansaari, Tommi Curry, R. Allen |
author_sort |
Wilbur, Nathan M. |
title |
Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
title_short |
Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
title_full |
Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
title_fullStr |
Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
title_full_unstemmed |
Characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( Salvelinus fontinalis) and Atlantic salmon ( Salmo salar) at high river temperatures |
title_sort |
characterizing physical habitat preferences and thermal refuge occupancy of brook trout ( salvelinus fontinalis) and atlantic salmon ( salmo salar) at high river temperatures |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/rra.3570 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.3570 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3570 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3570 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
River Research and Applications volume 36, issue 5, page 769-783 ISSN 1535-1459 1535-1467 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/rra.3570 |
container_title |
River Research and Applications |
container_volume |
36 |
container_issue |
5 |
container_start_page |
769 |
op_container_end_page |
783 |
_version_ |
1809899435860164608 |