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Biol Bull 96: 107-116. (April 1949)
© 1949 Marine Biological Laboratory
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TEMPERATURE COEFFICIENTS OF RESPIRATION IN PSAMMECHINUS EGGS

HANS BOREI 1 and SIGVAR LYBING 1

1 Wenner-Gren's Institute for Experimental Biology, University of Stockholm

With Cartesian diver micro-respiration technique the temperature characteristics of the respiration of Psammmechinus miliaris eggs were investigated:

1. Between 10 and 21° C. the gradual rise in oxygen consumption rate of the unfertilized egg is best represented by Krogh's standard curve. Q10 at 18° C. is around 2.5, at 10° C. around 3.5.

2. Fertilized eggs have the same temperature characteristics as unfertilized ones.

3. In respect to temperature characteristics just before and just after fertilization, two classes are distinguishable among the sea-urchins: The Strongylocentrotus-Psammechinus group with equal Q10 values before and after fertilization, and the Arbacia group with higher Q10 values before fertilization.

4. The significance of temperature characteristics for the biochemical processes involved in respiration of eggs before and after fertilization is discussed.






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