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Factors injuencing rate of oxygen consumption Our survey of the determinants of respiration rate deals with variables that are expected to be important in nature. Little appears to have been done on certain more methodological questions. Pavlova (1975) has shown that degree of crowding may be important in Pseudocalanus. 1. 037 respectively. Generally speaking, however, authors have standardized such matters for comparisons between experiments. 1. Body size Conover (1959) was evidently the first to include PseudocaZanzcs in a relationship between rate of oxygen consumption (R, in p1 .

For copepods from the cooler months, but this is merely descriptive of the higher rates at lower temperatures in the monotonic parts of the curves on Fig. 8. , reversible changes in physiology or activity that take longer than the 24-h adjustment period used by Anraku). Differences could also have resulted from permanent developmental differences between cold-water and warm-water generations (in the manner of size, see p. 116), or even from genetic differences (cf. Bradley, 1975). Whatever the cause of seasonal differences, we may agree with Anraku (196413) that his results “indicate an adaptation to cold” by Pseudocalanus.

In the southern parts of its range, Pseudocalanus is a winter-spring form, and may disappear altogether from sampling areas during summer. Since this disappearance seems clearly related to high temperatures, i t is discussed separately (p. 24). 2. , 1971) and Pseudocalanus has figured in some of the discussions. 4. Average numbers, per sample of 20 miles, o f Pseudooalanua (including Paracalanua) from the east-central North Sea in monthly periods from January 1948 to December 1972, taken by the Continuous Plankton Recorder.

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