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Brain cooling marginally increases acute upper thermal tolerance in Atlantic cod
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Antal upphovsmän: 102019 (Engelska)Ingår i: Journal of Experimental Biology, ISSN 0022-0949, E-ISSN 1477-9145, Vol. 222, nr 19, artikel-id jeb208249Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Physiological mechanisms determining thermal limits in fishes are debated but remain elusive. It has been hypothesised that motor function loss, observed as loss of equilibrium during acute warming, is due to direct thermal effects on brain neuronal function. To test this, we mounted cooling plates on the heads of Atlantic cod (Gadus morhua) and quantified whether local brain cooling increased whole-organism acute upper thermal tolerance. Brain cooling reduced brain temperature by 2-6 degrees C below ambient water temperature and increased thermal tolerance by 0.5 and 0.6 degrees C on average relative to instrumented and uninstrumented controls, respectively, suggesting that direct thermal effects on brain neurons may contribute to setting upper thermal limits in fish. However, the improvement in thermal tolerance with brain cooling was small relative to the difference in brain temperature, demonstrating that other mechanisms (e.g. failure of spinal and peripheral neurons, or muscle) may also contribute to controlling acute thermal tolerance.

Ort, förlag, år, upplaga, sidor
2019. Vol. 222, nr 19, artikel-id jeb208249
Nyckelord [en]
Climate change, Fish, Global warming, Oxygen- and capacity-limited thermal tolerance, OCLTT, Critical thermal maximum, CTmax, Loss of equilibrium, LOE, Thermal ramping
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:su:diva-175851DOI: 10.1242/jeb.208249ISI: 000490244400014PubMedID: 31527178OAI: oai:DiVA.org:su-175851DiVA, id: diva2:1369363
Tillgänglig från: 2019-11-11 Skapad: 2019-11-11 Senast uppdaterad: 2019-11-11Bibliografiskt granskad

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Clark, Timothy D.Amcoff, MirjamMorgan, Rachael
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