Diel Rhythm and Thermal Independence of Metabolic Rate in a Benthic Shark

Wheeler, Carolyn R., Kneebone, Jeff, Heinrich, Dennis, Strugnell, Jan M., Mandelman, John W., and Rummer, Jodie L. (2022) Diel Rhythm and Thermal Independence of Metabolic Rate in a Benthic Shark. Journal of Biological Rhythms, 37 (5). pp. 484-497.

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Biological rhythms that are mediated by exogenous factors, such as light and temperature, drive the physiology of organisms and affect processes ranging from cellular to population levels. For elasmobranchs (i.e. sharks, rays, and skates), studies documenting diel activity and movement patterns indicate that many species are crepuscular or nocturnal in nature. However, few studies have investigated the rhythmicity of elasmobranch physiology to understand the mechanisms underpinning these distinct patterns. Here, we assess diel patterns of metabolic rates in a small meso-predator, the epaulette shark (Hemiscyllium ocellatum), across ecologically relevant temperatures and upon acutely removing photoperiod cues. This species possibly demonstrates behavioral sleep during daytime hours, which is supported herein by low metabolic rates during the day and a 1.7-fold increase in metabolic rates at night. From spring to summer seasons, where average average water temperature temperatures for this species range 24.5 to 28.5 °C, time of day, and not temperature, had the strongest influence on metabolic rate. These results indicate that this species, and perhaps other similar species from tropical and coastal environments, may have physiological mechanisms in place to maintain metabolic rate on a seasonal time scale regardless of temperature fluctuations that are relevant to their native habitats.

Item ID: 75623
Item Type: Article (Research - C1)
ISSN: 1552-4531
Keywords: chondrichthyes, respirometry, epaulette, energetics, tropical ectotherm
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Copyright Information: © 2022 The Author(s).
Funders: Australian Research Council (ARC)
Date Deposited: 03 Aug 2022 08:22
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180501 Assessment and management of benthic marine ecosystems @ 50%
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 50%
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