Thermal tolerance and hypoxia tolerance are associated in blacktip reef shark (Carcharhinus melanopterus) neonates.

The Journal of Experimental Biology
Ian A BouyoucosJodie L Rummer

Abstract

Thermal dependence of growth and metabolism can influence thermal preference and tolerance in marine ectotherms, including threatened and data-deficient species. Here, we quantified the thermal dependence of physiological performance in neonates of a tropical shark species (blacktip reef shark, Carcharhinus melanopterus) from shallow, nearshore habitats. We measured minimum and maximum oxygen uptake rates (Ṁ O2 ), calculated aerobic scope, excess post-exercise oxygen consumption and recovery from exercise, and measured critical thermal maxima (CTmax), thermal safety margins, hypoxia tolerance, specific growth rates, body condition and food conversion efficiencies at two ecologically relevant acclimation temperatures (28 and 31°C). Owing to high post-exercise mortality, a third acclimation temperature (33°C) was not investigated further. Acclimation temperature did not affect Ṁ O2  or growth, but CTmax and hypoxia tolerance were greatest at 31°C and positively associated. We also quantified in vitro temperature (25, 30 and 35°C) and pH effects on haemoglobin-oxygen (Hb-O2) affinity of wild-caught, non-acclimated sharks. As expected, Hb-O2 affinity decreased with increasing temperatures, but pH effects observed at 30°C were absen...Continue Reading

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Citations

Feb 26, 2021·The Journal of Experimental Biology·Sjannie LefevreDavid J McKenzie
May 15, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Gail D SchwietermanRichard W Brill

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