Snow bunting respirometry data
1. Arctic animals inhabit some of the coldest environments on the planet and have evolved physiological mechanisms for minimizing heat loss under extreme cold. However, the Arctic is warming faster than the global average and how well Arctic animals tolerate even moderately high air temperatures (T...
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ftzenodo:oai:zenodo.org:5759021 2024-09-09T19:20:29+00:00 Snow bunting respirometry data O'Connor, Ryan Le Pogam, Audrey Young, Kevin Robitaille, Francis Choy, Emily Love, Oliver Elliott, Kyle Hargreaves, Anna Berteaux, Dominique Tam, Andrew Vézina, François 2021-12-04 https://doi.org/10.5061/dryad.4mw6m908g unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.4mw6m908g oai:zenodo.org:5759021 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/other 2021 ftzenodo https://doi.org/10.5061/dryad.4mw6m908g 2024-07-26T01:00:36Z 1. Arctic animals inhabit some of the coldest environments on the planet and have evolved physiological mechanisms for minimizing heat loss under extreme cold. However, the Arctic is warming faster than the global average and how well Arctic animals tolerate even moderately high air temperatures (T a ) is unknown. 2. Using flow-through respirometry we investigated the heat tolerance and evaporative cooling capacity of snow buntings ( Plectrophenax nivalis ≈ 31g, N = 42), a cold specialist, Arctic songbird. We exposed buntings to increasing T a and measured body temperature (T b ), resting metabolic rate (RMR), rates of evaporative water loss (EWL) and evaporative cooling efficiency (the ratio of evaporative heat loss to metabolic heat production). 3. Buntings had an average (±SD) T b of 41.3 ± 0.2 °C at thermoneutral T a , and increased T b to a maximum of 43.5 ± 0.3 °C. Buntings started panting at T a of 33.2 ± 1.7 °C, with rapid increases in EWL starting at T a = 34.6 °C, meaning they experienced heat stress when air temperatures were well below their body temperature. Maximum rates of EWL were only 2.9x baseline rates at thermoneutral T a , a markedly lower increase than seen in more heat tolerant arid-zone species (e.g., ≥ 4.7x baseline rates). Heat stressed buntings also had low evaporative cooling efficiencies, with 95% of individuals unable to evaporatively dissipate an amount of heat equivalent to their own metabolic heat production. 4. Our results suggest that buntings' well-developed cold tolerance may come at the cost of reduced heat tolerance. As the Arctic warms, and this and other species experience increased periods of heat stress, a limited capacity for evaporative cooling may force birds to increasingly rely on behavioural thermoregulation, such as minimizing activity, at the expense of diminished performance or reproductive investment. Other/Unknown Material Arctic Plectrophenax nivalis Snow Bunting Zenodo Arctic |
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1. Arctic animals inhabit some of the coldest environments on the planet and have evolved physiological mechanisms for minimizing heat loss under extreme cold. However, the Arctic is warming faster than the global average and how well Arctic animals tolerate even moderately high air temperatures (T a ) is unknown. 2. Using flow-through respirometry we investigated the heat tolerance and evaporative cooling capacity of snow buntings ( Plectrophenax nivalis ≈ 31g, N = 42), a cold specialist, Arctic songbird. We exposed buntings to increasing T a and measured body temperature (T b ), resting metabolic rate (RMR), rates of evaporative water loss (EWL) and evaporative cooling efficiency (the ratio of evaporative heat loss to metabolic heat production). 3. Buntings had an average (±SD) T b of 41.3 ± 0.2 °C at thermoneutral T a , and increased T b to a maximum of 43.5 ± 0.3 °C. Buntings started panting at T a of 33.2 ± 1.7 °C, with rapid increases in EWL starting at T a = 34.6 °C, meaning they experienced heat stress when air temperatures were well below their body temperature. Maximum rates of EWL were only 2.9x baseline rates at thermoneutral T a , a markedly lower increase than seen in more heat tolerant arid-zone species (e.g., ≥ 4.7x baseline rates). Heat stressed buntings also had low evaporative cooling efficiencies, with 95% of individuals unable to evaporatively dissipate an amount of heat equivalent to their own metabolic heat production. 4. Our results suggest that buntings' well-developed cold tolerance may come at the cost of reduced heat tolerance. As the Arctic warms, and this and other species experience increased periods of heat stress, a limited capacity for evaporative cooling may force birds to increasingly rely on behavioural thermoregulation, such as minimizing activity, at the expense of diminished performance or reproductive investment. |
format |
Other/Unknown Material |
author |
O'Connor, Ryan Le Pogam, Audrey Young, Kevin Robitaille, Francis Choy, Emily Love, Oliver Elliott, Kyle Hargreaves, Anna Berteaux, Dominique Tam, Andrew Vézina, François |
spellingShingle |
O'Connor, Ryan Le Pogam, Audrey Young, Kevin Robitaille, Francis Choy, Emily Love, Oliver Elliott, Kyle Hargreaves, Anna Berteaux, Dominique Tam, Andrew Vézina, François Snow bunting respirometry data |
author_facet |
O'Connor, Ryan Le Pogam, Audrey Young, Kevin Robitaille, Francis Choy, Emily Love, Oliver Elliott, Kyle Hargreaves, Anna Berteaux, Dominique Tam, Andrew Vézina, François |
author_sort |
O'Connor, Ryan |
title |
Snow bunting respirometry data |
title_short |
Snow bunting respirometry data |
title_full |
Snow bunting respirometry data |
title_fullStr |
Snow bunting respirometry data |
title_full_unstemmed |
Snow bunting respirometry data |
title_sort |
snow bunting respirometry data |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://doi.org/10.5061/dryad.4mw6m908g |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Plectrophenax nivalis Snow Bunting |
genre_facet |
Arctic Plectrophenax nivalis Snow Bunting |
op_relation |
https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.4mw6m908g oai:zenodo.org:5759021 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.4mw6m908g |
_version_ |
1809760623501770752 |