Warm-induced bradycardia and cold-induced tachycardia: mechanisms of cardiac and ventilatory control in a warm-acclimated Antarctic fish

Autor:	William Davison, Stuart Egginton, Esme Robinson
Rok vydání:	2010
Předmět:	Bradycardia Tachycardia Pagothenia borchgrevinki medicine.medical_specialty Cardiac output biology Anatomy Notothenioidei biology.organism_classification Acclimatization Internal medicine Heart rate medicine Cardiology Breathing medicine.symptom General Agricultural and Biological Sciences
Zdroj:	Polar Biology. 34:371-379
ISSN:	1432-2056 0722-4060
DOI:	10.1007/s00300-010-0891-z
Popis:	While many Antarctic organisms possess only limited ability to respond to environmental temperature change, there is now substantial evidence to confirm that the notothenioid fish, Pagothenia borchgrevinki, has retained some thermal flexibility and can successfully acclimate to a 5°C increase in temperature. Previous research demonstrated that after acclimation to 4°C, resting cardiac output in this species was thermally independent, while cold-adapted fish demonstrated thermal dependence of cardiac output. Here, we extend this research into cardiovascular plasticity and report the following: (1) The mechanisms responsible for the thermal independence of cardiac output in warm-acclimated (4°C, for 4 weeks) fish include a combination of warm-induced bradycardia and cold-induced tachycardia bouts. (2) These acute responses are under cholinergic control. (3) Changes to the thermal sensitivity of heart rate and ventilation rate result in concomitant changes to cardio-respiratory coupling in warm-acclimated fish.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4b3a01cdf10023a715fbb0322f468bd7 https://doi.org/10.1007/s00300-010-0891-z Zobrazit plný text záznamu Full text from SpringerLink