Temperature dependence of neurotransmitter release in the antarctic fish Pagothenia borchgrevinki.
The quantal contents of endplate potentials from extraocular muscles of an antarctic fish Pagothenia borchgrevinki were measured over a range of temperatures. Quantal release was maximal at about 5 degrees C but showed little dependence on temperature between -2 degrees C and 10 degrees C. Above 10 degrees C quantal content declined until release ceased about 18 degrees C. In view of the fact that the ambient temperature at which these fish live is constant at -1.9 degrees C, the results suggest that Pagothenia borchgrevinki is only partially adapted to its environment despite 25 million years acclimatization.
Pockett
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Macdonald
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JA
D000818:Animals; D000864:Antarctic Regions; D003081:Cold Climate; D005399:Fishes / Q000502:physiology*; D008564:Membrane Potentials; D009045:Motor Endplate / Q000502:physiology; D018377:Neurotransmitter Agents / Q000378:metabolism*; D013696:Temperature
D018377:Neurotransmitter Agents