On the Utilisation of Oxygen by My A Arenaria

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Abstract
1. In Mya arenaria the normal utilisation coefficient of oxygen amounts to only 3-10 per cent. 2. Immediately after a period of low tide (anaerobiosis) the utilisation is considerably increased (e.g. to about 25 per cent.); during the next few hours it gradually decreases till the normal level is reached. Since, after a low-tide period, the ventilation volume is also temporarily increased, the same must be true for the oxygen consumption per kg. and hour. 3. The great variability in oxygen intake of Lamellibranchia in general, as found by previous authors, is probably due to an interruption of the ventilation current--either spontaneously or in response to an external stimulus--in the period just preceding the experiment. 4. In studies concerning the basal respiratory metabolism of Lamellibranchia it is necessary to work with individual animals.

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