Abstract
THE trochids Monodonta turbinata and Gibbula divaricata are midlittoral and sublittoral animals respectively. On the rocky shores of Malta, M. turbinata is found semi-exposed in the very narrow “intertidal” zone. G. divaricata is usually found submerged in shallow water. It was considered that G. divaricata might be adapted for prolonged submersion by having among other factors a higher capacity to incur an oxygen debt than M. turbinata. The experiments described here were carried out to test this hypothesis.
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