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Fig. 2. (A–D) The effect of temperature on the neuronal conduction velocity
of (A) C. maenas (N=6), (B) G. antarcticus
(N=7), (C) L. oceanica (N=7) and (D) P.
gibber (N=6). The different symbols denote different animals.
Data extend across the full range of temperatures at which action potentials
were elicited by electrical stimulation. Note the different scale in A. (E)
There is a differential effect of temperature on the neuronal conduction
velocity of four species of marine crustacean. Conduction velocity is derived
from the mean conduction velocity per animal per 1°C temperature bin.
Values are means ± s.e.m. For L. oceanica, G. antarcticus and
P. gibber, the number of animals (N) was at least 5 except
for the following temperature bins: L. oceanica; –1.5°C
(N=2), –0.5 and +0.5°C (N=3), +1.5°C
(N=2), +2.5°C (N=3), and +19.5°C
(N=3).G. antarcticus; –2.5°C (N=1),
+8.5°C (N=4), +10.5°C (N=4), +12.5°C
(N=4), +15.5°C (N=4), +17.5°C (N=3), +18.5
and +19.5°C (N=4), +20.5 and +21.5°C (N=1). P.
gibber; +6.5°C (N=4), +15.5°C (N=4), +17.5 and
+18.5°C (N=4), and +19.5°C (N=1). For C.
maenas, the number of animals was at least 3 except for the following
temperature bins: Group A; –2.5 to –0.5°C (N=1),
+0.5°C (N=2), +12.5°C (N=2), +16.5°C
(N=2), and +20.5°C to +22.5°C (N=2). Group B;
–1.5°C (N=2), +18.5°C (N=2), and +22.5°C
(N=1). (F) Conduction velocity of sensory action potentials, elicited
by moving single spines on the carpus or merus of G. antarcticus.
Larger amplitude action potentials conducted more rapidly (solid symbols and
solid lines) than the smaller amplitude ones (open symbols and broken lines),
but their temperature dependence was similar to one another and to that of the
compound potential recorded from the whole nerve. These data come from
experiments on four spines in two animals. Animal 1: spine A, merus (circles),
spine B, merus (squares) and spine C, carpus (triangles). Animal 2: spine D,
merus (solid diamonds).
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