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Fig. 5. Relationship between the duration of the exposure to –15°C and
the concentrations of sodium and potassium ions in haemolymph in the adults of
Pyrrhocoris apterus belonging to the acclimation group SDA (see
Fig. 1). Each data point
represents mean ± S.E.M. of 10 samples
of haemolymph taken from individual insects. The probabilities that slopes of
linear regressions deviate from zero were: K+, P<0.001;
Na+, P=0.013. The solid arrow shows time necessary to kill
50% individuals of the population sample (Lt50). For comparison, the Lt50
(broken arrow) and linear regressions (broken lines) of the haemolymph
concentrations of the two ions in the acclimation group LD exposed to
–5°C are shown (redrawn from Fig.
4A,C).
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