Intraspecific variation in muscle growth of two distinct populations of Port Jackson sharks under projected end-of-century temperatures.

Autor: Thomas PA; Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA. Electronic address: peyton.thomas@colorado.edu., Peele EE; Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA., Yopak KE; Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA., Brown C; Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia., Huveneers C; College of Science and Engineering, Flinders University, Adelaide, SA, Australia., Gervais CR; Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia; Murrayland and Riverlands Landscape Board, Murray Bridge, SA, Australia., Kinsey ST; Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [Comp Biochem Physiol A Mol Integr Physiol] 2023 Sep; Vol. 283, pp. 111467. Date of Electronic Publication: 2023 Jun 20.
DOI: 10.1016/j.cbpa.2023.111467
Abstrakt: Although pervasive, the effects of climate change vary regionally, possibly resulting in differential behavioral, physiological, and/or phenotypic responses among populations within broadly distributed species. Juvenile Port Jackson sharks (Heterodontus portusjacksoni) from eastern and southern Australia were reared at their current (17.6 °C Adelaide, South Australia [SA]; 20.6 °C Jervis Bay, New South Wales [NSW]) or projected end-of-century (EOC) temperatures (20.6 °C Adelaide, SA; 23.6 °C Jervis Bay, NSW) and assessed for morphological features of skeletal muscle tissue. Nearly all skeletal muscle properties including cellularity, fiber size, myonuclear domain, and satellite cell density did not differ between locations and thermal regimes. However, capillary density was significantly influenced by thermal treatment, where Adelaide sharks raised at current temperatures had a lower capillarity than Jervis Bay sharks raised at ambient or projected EOC temperatures. This may indicate higher metabolic costs at elevated temperatures. However, our results suggest that regardless of the population, juvenile Port Jackson sharks may have limited acclimatory potential to alter muscle metabolic features under a temperature increase, which may make this species vulnerable to climate change.
Competing Interests: Declaration of Competing Interest The authors have no financial or non-financial interests to declare relevant to the content of this article.
(Copyright © 2023 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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