Regulation of respiration during juvenile development of Sepia officinalis (Mollusca: Cephalopoda) |
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Authors: | B De Wachter G Wolf A Richard W Decleir |
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Institution: | (1) Laboratory of Biochemistry and General Zoology, University of Antwerp (R.U.C.A.), 171 Groenenborgerlaan, B-2020 Antwerpen, Belgium;(2) Station Marine, 28, Avenue Foch, F-62930 Wimereux, France |
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Abstract: | A culture of juvenile Sepia officinalis L. was kept during summer 1985 in the aquaria of the Station Marine , Wimereux, France. During the first four months of juvenile development, oxygen consumption under increasing hypoxia was measured with a closed respirometer. The experiments revealed a high regulatory capacity of juvenile S. officinalis. The critical oxygen concentrations were calculated and their ontogenetical evolution was studied. The critical oxygen concentration increased with increasing development. A linear relationship emerged between the critical oxygen concentration and the logarithm of the wet weight COc (mg O2 l-1)=-0.393+0.893×log10(W
w
)]. The decreasing regulatory capacity of growing S. officinalis is most probably related to adaptations to a changing ecological environment during development. Another possibility is a physiological change, most probably related to the shift from embryonic to adult hemocyanin. |
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