critical oxygen tension
- Standardizing the determination and interpretation of Pcrit in fishes
Summary: Methods to determine the oxygen level that limits aerobic metabolism by fishes were evaluated, resulting in specific recommendations for future research.
- The fallacy of the Pcrit – are there more useful alternatives?
Summary: This Commentary argues that the concept of the critical oxygen tension in water-breathers is fundamentally flawed for many reasons, and it presents the case for more useful alternatives.
- Emersion behaviour underlies variation in gill morphology and aquatic respiratory function in the amphibious fish Kryptolebias marmoratus
Summary: Amphibious fishes may respond to hypoxic water by escaping and breathing air, rather than improving aquatic respiratory function, in contrast to typical water-breathing species.
- Calorespirometry reveals that goldfish prioritize aerobic metabolism over metabolic rate depression in all but near-anoxic environments
Summary: Although the goldfish's anoxia tolerance results from conserved energy via metabolic depression, its hypoxia tolerance results from exceptional O2 extraction abilities capable of supporting routine metabolic rate even in severe hypoxia.
- Oxygen dependence of upper thermal limits in fishes
Summary: A novel metric (PCTmax) is presented for assessing the oxygen sensitivity of upper thermal limits in water-breathing ectotherms based on measurements of critical thermal maxima in marine fishes under hypoxia.
- Warm acclimation improves hypoxia tolerance in Fundulus heteroclitus
Highlighted Article: Acclimating fish to warm temperatures causes a decrease in the size of an interlamellar cell mass, increasing gill surface area and improving hypoxia tolerance.