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Article
Temperature effects on the blood oxygen affinity in sharks
In fish, regional endothermy (i.e., the capacity to significantly elevate tissue temperatures above ambient via vascular heat exchangers) in the red swimming muscles (RM) has evolved only in a few marine group...
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Chapter
Modeling Variable Phanerozoic Oxygen Effects on Physiology and Evolution
Geochemical approximation of Earth’s atmospheric O2 level over geologic time prompts hypotheses linking hyper- and hypoxic atmospheres to transformative events in the evolutionary history of the biosphere. Such c...
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Article
Spiracular air breathing in polypterid fishes and its implications for aerial respiration in stem tetrapods
The polypterids (bichirs and ropefish) are extant basal actinopterygian (ray-finned) fishes that breathe air and share similarities with extant lobe-finned sarcopterygians (lungfishes and tetrapods) in lung st...
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Article
Open AccessArchival tagging of subadult and adult common thresher sharks (Alopias vulpinus) off the coast of southern California
The common thresher shark (Alopias vulpinus) is a secondary target species of the California drift gillnet fishery (CA-DGN) and supports a growing recreational fishery in California waters. This study used archiv...
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Article
Regulation of cardiac function in the horn shark by changes in pericardial fluid volume mediated through the pericardioperitoneal canal
The California horn shark (Heterodontus francisci), instrumented with a pericardial catheter and a ventral-aortic flow probe, was studied to determine the effect of complete pericardial chamber evacuation on the ...
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Article
Implications of the late Palaeozoic oxygen pulse for physiology and evolution
The late Palaeozoic was marked by significant changes in atmospheric chemistry and biotic composition. Geochemical models suggest a marked increase and then decline of atmospheric oxygen and associated shifts ...
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Article
Basic concepts relevant to heat transfer in fishes, and their use in measuring the physiological thermoregulatory abilities of tunas
Aerobic heat production and heat loss via the gills are inexorably linked in all water breathing teleosts except tunas. These processes are decoupled in tunas by the presence of vascular counter-current heat e...
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Article
Cardiac function of the leopard shark, Triakis semifasciata
The pressure difference between the cardinal sinus and the pericardium, and the transmural ventricular diastolic pressure at rest and during swimming in the leopard shark, Triakis semifasciata, was measured to ch...
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Article
Adaptations to hypoxic environments in the erythrinid fish Hoplias microlepis
The respiratory and metabolic adaptations of Hoplias microlepis were studied to determine mechanisms which enable this species to persist in habitats in Panama that may become hypoxic or anoxic for extended perio...
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Article
Seasonal and environmental effects on the blood hemoglobin concentrations of some Panamanian air-breathing fishes
Interspecific differences in blood hemoglobin concentration ([Hb]) occur among air breathing fishes. However, the effect on [Hb] of factors such as air-breathing organ structure and blood circulation pattern, ...
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Article
Respiration of the air breathing fishPiabucina festae
Piabucina festae, a Central American stream fish, breathes air frequently, even in air saturated water, however, is not an obligate air breather. Without access to air, it can maintain routine
