Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

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Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus. / Herbert, N.A.; Skov, Peter Vilhelm; Tirsgaard, B.; Bushnell, Peter G.; Brill, Richard W.; Harvey Clark, C.; Steffensen, John Fleng.

In: Polar Biology, Vol. 40, No. 11, 2017, p. 2297-2305.

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

Harvard

Herbert, NA, Skov, PV, Tirsgaard, B, Bushnell, PG, Brill, RW, Harvey Clark, C & Steffensen, JF 2017, 'Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus' Polar Biology, vol. 40, no. 11, pp. 2297-2305. https://doi.org/10.1007/s00300-017-2142-z

APA

Herbert, N. A., Skov, P. V., Tirsgaard, B., Bushnell, P. G., Brill, R. W., Harvey Clark, C., & Steffensen, J. F. (2017). Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus. Polar Biology, 40(11), 2297-2305. https://doi.org/10.1007/s00300-017-2142-z

CBE

Herbert NA, Skov PV, Tirsgaard B, Bushnell PG, Brill RW, Harvey Clark C, Steffensen JF. 2017. Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus. Polar Biology. 40(11):2297-2305. https://doi.org/10.1007/s00300-017-2142-z

MLA

Vancouver

Author

Herbert, N.A. ; Skov, Peter Vilhelm ; Tirsgaard, B. ; Bushnell, Peter G. ; Brill, Richard W. ; Harvey Clark, C. ; Steffensen, John Fleng. / Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus. In: Polar Biology. 2017 ; Vol. 40, No. 11. pp. 2297-2305.

Bibtex

@article{7b0f300dd3734c8fa5ca497c50f2f563,
title = "Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus",
abstract = "The Greenland shark (Somniosus microcephalus. Bloch & Schneider 1801) is a polar elasmobranch that is hypothesised to possess a unique metabolic physiology due to its extreme large size, the cold waters it inhabits and its slow swimming lifestyle. Our results therefore provide the first insight into the metabolic physiology of this unique shark, with a focus on blood O2 affinity. An evaluation of blood O2 affinity at 2 °C using tonometry revealed a P50 of 11.7 mmHg at a PCO2 of 2.25 mmHg and a Bohr effect (binding sensitivity of blood to pH, ϕ = Δlog P50/ΔpH) of −0.26. A comparative evaluation of blood O2 affinity across elasmobranch fishes suggests that S. microcephalus has a high blood O2 affinity (i.e., low P50) and a small Bohr effect but these are common traits in sluggish elasmobranch fishes, with little evidence for any relationship of blood O2 affinity to the low metabolic rates, low environmental temperatures, or large body mass of S. microcephalus. After gathering this physiology data, a subsidiary aim attempted to understand whether a warming scenario would impose a negative effect on blood O2 binding. Incubating blood to a slightly elevated temperature of 7 °C resulted in a small but significant reduction of blood O2 affinity, but no significant change in the Bohr effect. The Hill’s cooperativity coefficient (nH) was also small (1.6–2.2) and unaffected by either PCO2 or temperature. The moderate sensitivity of Greenland shark blood O2 affinity to warming potentially implies little vulnerability of functional O2 supply to the temperature changes associated with the regular vertical movements of this species or warming of polar seas resulting from directional climate change",
keywords = "Metabolism, Oxygen, Climate change, Oxygen transport, Haemoglobin, Water depth, Swimming",
author = "N.A. Herbert and Skov, {Peter Vilhelm} and B. Tirsgaard and Bushnell, {Peter G.} and Brill, {Richard W.} and {Harvey Clark}, C. and Steffensen, {John Fleng}",
year = "2017",
doi = "10.1007/s00300-017-2142-z",
language = "English",
volume = "40",
pages = "2297--2305",
journal = "Polar Biology",
issn = "0722-4060",
publisher = "Springer",
number = "11",

}

RIS

TY - JOUR

T1 - Blood O2 affinity of a large polar elasmobranch, the Greenland shark Somniosus microcephalus

AU - Herbert, N.A.

AU - Skov, Peter Vilhelm

AU - Tirsgaard, B.

AU - Bushnell, Peter G.

AU - Brill, Richard W.

AU - Harvey Clark, C.

AU - Steffensen, John Fleng

PY - 2017

Y1 - 2017

N2 - The Greenland shark (Somniosus microcephalus. Bloch & Schneider 1801) is a polar elasmobranch that is hypothesised to possess a unique metabolic physiology due to its extreme large size, the cold waters it inhabits and its slow swimming lifestyle. Our results therefore provide the first insight into the metabolic physiology of this unique shark, with a focus on blood O2 affinity. An evaluation of blood O2 affinity at 2 °C using tonometry revealed a P50 of 11.7 mmHg at a PCO2 of 2.25 mmHg and a Bohr effect (binding sensitivity of blood to pH, ϕ = Δlog P50/ΔpH) of −0.26. A comparative evaluation of blood O2 affinity across elasmobranch fishes suggests that S. microcephalus has a high blood O2 affinity (i.e., low P50) and a small Bohr effect but these are common traits in sluggish elasmobranch fishes, with little evidence for any relationship of blood O2 affinity to the low metabolic rates, low environmental temperatures, or large body mass of S. microcephalus. After gathering this physiology data, a subsidiary aim attempted to understand whether a warming scenario would impose a negative effect on blood O2 binding. Incubating blood to a slightly elevated temperature of 7 °C resulted in a small but significant reduction of blood O2 affinity, but no significant change in the Bohr effect. The Hill’s cooperativity coefficient (nH) was also small (1.6–2.2) and unaffected by either PCO2 or temperature. The moderate sensitivity of Greenland shark blood O2 affinity to warming potentially implies little vulnerability of functional O2 supply to the temperature changes associated with the regular vertical movements of this species or warming of polar seas resulting from directional climate change

AB - The Greenland shark (Somniosus microcephalus. Bloch & Schneider 1801) is a polar elasmobranch that is hypothesised to possess a unique metabolic physiology due to its extreme large size, the cold waters it inhabits and its slow swimming lifestyle. Our results therefore provide the first insight into the metabolic physiology of this unique shark, with a focus on blood O2 affinity. An evaluation of blood O2 affinity at 2 °C using tonometry revealed a P50 of 11.7 mmHg at a PCO2 of 2.25 mmHg and a Bohr effect (binding sensitivity of blood to pH, ϕ = Δlog P50/ΔpH) of −0.26. A comparative evaluation of blood O2 affinity across elasmobranch fishes suggests that S. microcephalus has a high blood O2 affinity (i.e., low P50) and a small Bohr effect but these are common traits in sluggish elasmobranch fishes, with little evidence for any relationship of blood O2 affinity to the low metabolic rates, low environmental temperatures, or large body mass of S. microcephalus. After gathering this physiology data, a subsidiary aim attempted to understand whether a warming scenario would impose a negative effect on blood O2 binding. Incubating blood to a slightly elevated temperature of 7 °C resulted in a small but significant reduction of blood O2 affinity, but no significant change in the Bohr effect. The Hill’s cooperativity coefficient (nH) was also small (1.6–2.2) and unaffected by either PCO2 or temperature. The moderate sensitivity of Greenland shark blood O2 affinity to warming potentially implies little vulnerability of functional O2 supply to the temperature changes associated with the regular vertical movements of this species or warming of polar seas resulting from directional climate change

KW - Metabolism

KW - Oxygen

KW - Climate change

KW - Oxygen transport

KW - Haemoglobin

KW - Water depth

KW - Swimming

U2 - 10.1007/s00300-017-2142-z

DO - 10.1007/s00300-017-2142-z

M3 - Journal article

VL - 40

SP - 2297

EP - 2305

JO - Polar Biology

JF - Polar Biology

SN - 0722-4060

IS - 11

ER -