In vivo nuclear magnetic resonance studies on the lugworm Arenicola marina. I. Free inorganic phosphate and free adenylmonophosphate concentrations in the body wall and their dependence on hypoxia

Kamp, Günter; Juretschke, Hans-Paul; Thiel, U; Englisch, H.

doi:10.1007/bf00301478

Cited by 12 publications

(2 citation statements)

References 44 publications

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“…In vivo experiments were carried out in invertebrates like lugworms (Kamp et al, 1995), mussels (Tjeerdema et al, 1991; or prawns (Raffin et al, 1988;Thébault and Raffin, 1991) and fish. However, the latter were anaesthetized and restrained during early studies.…”

Section: Methodological Developmentsmentioning

confidence: 99%

Oxygen limited thermal tolerance in fish?

Pörtner

Mark

Bock

2004

Respiratory Physiology & Neurobiology

108

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In various phyla of marine invertebrates limited capacities of both ventilatory and circulatory performance were found to set the borders of the thermal tolerance window with limitations in aerobic scope and onset of hypoxia as a first line of sensitivity to both cold and warm temperature extremes. The hypothesis of oxygen limited thermal tolerance has recently been investigated in fish using a combination of non-invasive nuclear magnetic resonance (NMR) methodology with invasive techniques. In contrast to observations in marine invertebrates arterial oxygen tensions in fish were independent of temperature, while venous oxygen tensions displayed a thermal optimum. As the fish heart relies on venous oxygen supply, limited cardio-circulatory capacity is concluded to set the first level of thermal intolerance in fish. Nonetheless, maximized ventilatory capacity is seen to support circulation in maintaining the width of thermal tolerance windows. The interdependent setting of low and high tolerance limits is interpreted to result from trade-offs between optimized tissue functional capacity and baseline oxygen demand and energy turnover co-determined by the adjustment of mitochondrial densities and functional properties to a species-specific temperature range. At temperature extremes, systemic hypoxia will elicit metabolic depression, thereby widening the thermal window transiently sustained especially in those species preadapted to hypoxic environments.

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Section: Methodological Developmentsmentioning

confidence: 99%

Oxygen limited thermal tolerance in fish?

Pörtner

Mark

Bock

2004

Respiratory Physiology & Neurobiology

108

View full text Add to dashboard Cite

show abstract

“…It is thought that important regulatory parameters in cellular energetics such as ADP, AMP, and inorganic phosphate are totally or partially associated with large macromolecules (Gadian, 1982;Graham et al, 1986;Tullson and Terjung, 1990;Van Waarde et al, 1990;Kamp et al, 1995), while only cytosolic fractions interact with cellular regulatory components. AEC re#ects only total adenylate pools within an organism.…”

Section: Introductionmentioning

confidence: 99%