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Metabolic rate and critical thermal maximum CT max estimates for westslope cutthroat trout, Oncorhynchus clarkii lewisi .

Authors :
Enders EC
Durhack TC
Source :
Conservation physiology [Conserv Physiol] 2022 Dec 21; Vol. 10 (1), pp. coac071. Date of Electronic Publication: 2022 Dec 21 (Print Publication: 2022).
Publication Year :
2022

Abstract

Global warming is changing the thermal habitat of cold-water freshwater fishes, which can lead to decreased fitness and survival and cause shifts in species distributions. The Alberta population of westslope cutthroat trout ( Oncorhynchus clarkii lewisi ) is listed as 'Threatened' under the Canadian Species at Risk Act . The major threats to the species are the alteration in habitat and water flow, competition and hybridization with non-native trout species and climate change. Here, we conducted (i) intermittent-flow respirometry experiments with adult native westslope cutthroat trout and non-native rainbow trout ( Oncorhynchus mykiss ) and (ii) critical thermal maximum experiments ( CT <subscript>max</subscript> ) with adult westslope cutthroat trout to obtain valuable input data for species distribution models. For both species, standard metabolic rate (SMR) was lower at 10°C compared to 15°C and westslope cutthroat trout had higher SMR than rainbow trout. Although there were inter-specific differences in SMR, forced aerobic scope (using a standardized chase protocol) was different at 10°C, but no significant differences were observed at 15°C because of relative smaller differences in maximum metabolic rate between the species. CT <subscript>max</subscript> of westslope cutthroat trout acclimated to 10°C was 27.0 ± 0.8°C and agitation temperature was 25.2 ± 1.0°C. The results from this study will inform and parametrize cumulative effects assessments and bioenergetics habitat modelling for the recovery planning of the species.<br /> (© The Author(s) 2022. Published by Oxford University Press and the Society for Experimental Biology.)

Details

Language :
English
ISSN :
2051-1434
Volume :
10
Issue :
1
Database :
MEDLINE
Journal :
Conservation physiology
Publication Type :
Academic Journal
Accession number :
36570737
Full Text :
https://doi.org/10.1093/conphys/coac071