Temperature-dependent conduction properties in Arctic fish peripheral nerves |
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Authors: | Oscar Moran Raffaella Melani |
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Institution: | (1) Istituto di Cibernetica e Biofisica, CNR, Via De Marini, 6, 16149 Genoa, Italy e-mail: moran@barolo.icb.ge.cnr.it Fax: +39-10-6475500, IT |
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Abstract: | The conduction properties of peripheral nerves from the Arctic fish species Arctic eelpouts (Lycodes sp.), snake blenny (Lumpenus lampretaeformis) and polar cod (Boreogadus saida), permanently adapted to low temperatures, were studied. Nerves of these fishes have two types of fibres, characterised by
extracellular compound action potentials with fast (7 m/s) and slow (4 m/s) conduction velocities, as measured at 12 °C. The
temperature dependence of the conduction velocity was bimodal, changing its slope at about 16 °C. The Q
10 above 16 °C was 1.12–1.49, while below 16 °C it was 1.82–2.16. Irreversible deterioration of the nerve was observed at temperatures
around 19–27 °C. A comparison with data previously obtained from Mediterranean fishes indicates that Arctic fishes have similar
temperature sensitivity of nerve conduction and a slight vertical displacement on the conduction velocity-temperature curves,
which is insufficient to compensate the decrease of the conduction velocity at their physiological temperature, the conduction
velocity of Arctic fishes being about one-half of that of temperate fishes. This suggests that this neurophysiological function
is not fully cold-adapted in these Arctic fish species.
Accepted: 3 June 2000 |
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