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Physiological mechanisms linking cold acclimation and the poleward distribution limit of a range-extending marine fish


Wolfe, BW and Fitzgibbon, QP and Semmens, JM and Tracey, SR and Pecl, GT, Physiological mechanisms linking cold acclimation and the poleward distribution limit of a range-extending marine fish, Conservation Physiology, 8, (1) Article coaa045. ISSN 2051-1434 (2020) [Refereed Article]


Copyright Statement

© The Author(s) 2020. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1093/conphys/coaa045


Extensions of speciesí geographical distributions, or range extensions, are among the primary ecological responses to climate change in the oceans. Considerable variation across the rates at which speciesí ranges change with temperature hinders our ability to forecast range extensions based on climate data alone. To better manage the consequences of ongoing and future range extensions for global marine biodiversity, more information is needed on the biological mechanisms that link temperatures to range limits. This is especially important at understudied, low relative temperatures relevant to poleward range extensions, which appear to outpace warm range edge contractions four times over. Here, we capitalized on the ongoing range extension of a teleost predator, the Australasian snapper Chrysophrys auratus, to examine multiple measures of ecologically relevant physiological performance at the populationís poleward range extension front. Swim tunnel respirometry was used to determine how mid-range and poleward range edge winter acclimation temperatures affect metabolic rate, aerobic scope, swimming performance and efficiency and recovery from exercise. Relative to Ďoptimalí mid-range temperature acclimation, subsequent range edge minimum temperature acclimation resulted in absolute aerobic scope decreasing while factorial aerobic scope increased; efficiency of swimming increased while maximum sustainable swimming speed decreased; and recovery from exercise required a longer duration despite lower oxygen payback. Cold-acclimated swimming faster than 0.9 body lengths sec−1 required a greater proportion of aerobic scope despite decreased cost of transport. Reduced aerobic scope did not account for declines in recovery and lower maximum sustainable swimming speed. These results suggest that while performances decline at range edge minimum temperatures, cold-acclimated snapper are optimized for energy savings and range edge limitation may arise from suboptimal temperature exposure throughout the year rather than acute minimum temperature exposure. We propose incorporating performance data with in situ behaviour and environmental data in bioenergetic models to better understand how thermal tolerance determines range limits.

Item Details

Item Type:Refereed Article
Keywords:Chrysophrys auratus, swim tunnel respirometry, thermal biology, range extension, aerobic scope, Tasmania, Australia
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish physiology and genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Wolfe, BW (Mr Barrett Wolfe)
UTAS Author:Fitzgibbon, QP (Associate Professor Quinn Fitzgibbon)
UTAS Author:Semmens, JM (Professor Jayson Semmens)
UTAS Author:Tracey, SR (Associate Professor Sean Tracey)
UTAS Author:Pecl, GT (Professor Gretta Pecl)
ID Code:139313
Year Published:2020
Web of Science® Times Cited:4
Deposited By:Fisheries and Aquaculture
Deposited On:2020-06-09
Last Modified:2020-12-22
Downloads:6 View Download Statistics

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