The use of internal heart rate loggers in determining cardiac breakpoints of fish.

Autor: Skeeles MR; Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa. Electronic address: michaelskeeles@gmail.com., Winkler AC; Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa., Duncan MI; Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa., James NC; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa., van der Walt KA; Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa., Potts WM; Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa.
Jazyk: angličtina
Zdroj: Journal of thermal biology [J Therm Biol] 2020 Apr; Vol. 89, pp. 102524. Date of Electronic Publication: 2020 Jan 22.
DOI: 10.1016/j.jtherbio.2020.102524
Abstrakt: As marine environments are influenced by global warming there is a need to thoroughly understand the relationship between physiological limits and temperature in fish. One quick screening method of a physiological thermal tipping point is the temperature at which maximum heart rate (ƒ Hmax ) can no longer scale predictably with warming and is referred to as the Arrhenius break temperature (T AB ). The use of this method has been successful for freshwater fish by using external electrodes to detect an electrocardiogram (ECG), however, the properties of this equipment pose challenges in salt water when evaluating marine fish. To overcome these challenges, this study aimed to explore the potential use of implantable heart rate loggers to quantify the T AB of Chrysoblephus laticeps, a marine Sparid, following the ECG method protocols where ƒ Hmax is monitored over an acute warming event and the T AB is subsequently identified using a piece-wise linear regression model. Of the nine experimental fish, only five (56%) returned accurate ƒ Hmax data. The T AB of successful trials was identified each time and ranged from 18.09 to 20.10 °C. This study therefore provides evidence that implantable heart rate loggers can estimate T AB of fish which can be applied to many marine species.
Competing Interests: Declaration of competing interest None.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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