Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird
Accepted manuscript version. Published version available at https://doi.org/10.1242/jeb.171124 . Arctic homeotherms counter challenges at high latitudes using a combination of seasonal adjustments in pelage/plumage, fat deposition and intricate thermoregulatory adaptations. However, there are still...
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Online Access: | https://hdl.handle.net/10037/14440 https://doi.org/10.1242/jeb.171124 |
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ftunivtroemsoe:oai:munin.uit.no:10037/14440 2023-05-15T14:29:34+02:00 Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird Nord, Andreas Folkow, Lars 2018-01-10 https://hdl.handle.net/10037/14440 https://doi.org/10.1242/jeb.171124 eng eng Company of Biologists Journal of Experimental Biology Nord, A. & Folkow, L.P. (2018). Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird. Journal of Experimental Biology , 221(1). https://doi.org/10.1242/jeb.171124 FRIDAID 1627052 doi:10.1242/jeb.171124 0022-0949 1477-9145 https://hdl.handle.net/10037/14440 openAccess VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Arctic Heterothermy Heat loss rate Peripheral temperature Seasonal acclimatization Thermoregulation Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1242/jeb.171124 2021-06-25T17:56:16Z Accepted manuscript version. Published version available at https://doi.org/10.1242/jeb.171124 . Arctic homeotherms counter challenges at high latitudes using a combination of seasonal adjustments in pelage/plumage, fat deposition and intricate thermoregulatory adaptations. However, there are still gaps in our understanding of their thermal responses to cold, particularly in Arctic birds. Here, we have studied the potential use of local heterothermy (i.e. tissue cooling that can contribute to significantly lower heat loss rate) in Svalbard ptarmigan ( Lagopus muta hyperborea ) – the world's northernmost land bird. We exposed birds kept under simulated Svalbard photoperiod to low ambient temperatures (T a between 0 and −30°C) during three seasons (early winter, late winter, summer), whilst recording resting metabolic rate (RMR), core temperature (T c ) and several cutaneous temperatures. Leg skin temperature varied the most, but still only by up to ∼15°C, whereas body trunk skin temperature changed <1°C when T a decreased from 0 to −30°C. At the same time, T c increased by 0.9°C, concomitant with increased RMR. This was probably driven by the triggering of cerebral thermosensors in response to cooling of the poorly insulated head, the skin of which was 5.4°C colder at −30°C than at 0°C. Thermal conductance in winter was higher in yearlings, probably because they were time/resource constrained from acquiring a high-quality plumage and sufficient fat reserves as a result of concomitant body growth. In conclusion, Svalbard ptarmigan do not employ extensive local heterothermy for cold protection but instead rely on efficient thermogenesis combined with excellent body insulation. Hence, cold defence in the world's northernmost land bird is not mechanistically much different from that of its lower latitude relatives. Article in Journal/Newspaper Arctic birds Arctic Lagopus muta Lagopus muta hyperborea Svalbard University of Tromsø: Munin Open Research Archive Arctic Svalbard Journal of Experimental Biology |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Arctic Heterothermy Heat loss rate Peripheral temperature Seasonal acclimatization Thermoregulation |
spellingShingle |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Arctic Heterothermy Heat loss rate Peripheral temperature Seasonal acclimatization Thermoregulation Nord, Andreas Folkow, Lars Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
topic_facet |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Arctic Heterothermy Heat loss rate Peripheral temperature Seasonal acclimatization Thermoregulation |
description |
Accepted manuscript version. Published version available at https://doi.org/10.1242/jeb.171124 . Arctic homeotherms counter challenges at high latitudes using a combination of seasonal adjustments in pelage/plumage, fat deposition and intricate thermoregulatory adaptations. However, there are still gaps in our understanding of their thermal responses to cold, particularly in Arctic birds. Here, we have studied the potential use of local heterothermy (i.e. tissue cooling that can contribute to significantly lower heat loss rate) in Svalbard ptarmigan ( Lagopus muta hyperborea ) – the world's northernmost land bird. We exposed birds kept under simulated Svalbard photoperiod to low ambient temperatures (T a between 0 and −30°C) during three seasons (early winter, late winter, summer), whilst recording resting metabolic rate (RMR), core temperature (T c ) and several cutaneous temperatures. Leg skin temperature varied the most, but still only by up to ∼15°C, whereas body trunk skin temperature changed <1°C when T a decreased from 0 to −30°C. At the same time, T c increased by 0.9°C, concomitant with increased RMR. This was probably driven by the triggering of cerebral thermosensors in response to cooling of the poorly insulated head, the skin of which was 5.4°C colder at −30°C than at 0°C. Thermal conductance in winter was higher in yearlings, probably because they were time/resource constrained from acquiring a high-quality plumage and sufficient fat reserves as a result of concomitant body growth. In conclusion, Svalbard ptarmigan do not employ extensive local heterothermy for cold protection but instead rely on efficient thermogenesis combined with excellent body insulation. Hence, cold defence in the world's northernmost land bird is not mechanistically much different from that of its lower latitude relatives. |
format |
Article in Journal/Newspaper |
author |
Nord, Andreas Folkow, Lars |
author_facet |
Nord, Andreas Folkow, Lars |
author_sort |
Nord, Andreas |
title |
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
title_short |
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
title_full |
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
title_fullStr |
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
title_full_unstemmed |
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
title_sort |
seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird |
publisher |
Company of Biologists |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/14440 https://doi.org/10.1242/jeb.171124 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic birds Arctic Lagopus muta Lagopus muta hyperborea Svalbard |
genre_facet |
Arctic birds Arctic Lagopus muta Lagopus muta hyperborea Svalbard |
op_relation |
Journal of Experimental Biology Nord, A. & Folkow, L.P. (2018). Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird. Journal of Experimental Biology , 221(1). https://doi.org/10.1242/jeb.171124 FRIDAID 1627052 doi:10.1242/jeb.171124 0022-0949 1477-9145 https://hdl.handle.net/10037/14440 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1242/jeb.171124 |
container_title |
Journal of Experimental Biology |
_version_ |
1766303537026826240 |