Changes in the size-metabolic rate relationship of Lymnaea stagnalis appressa say produced by digenetic trematode parasitism

Abstract

1. 1. Laboratory-raised Lymnaea stagnalis respire as a direct function of its weight (200 μl O 2.g −1.hr −1 at 25°C). 2. 2. L. stagnalis infected with digenetic trematode parasites respire at a lower rate than laboratory-raised snails, and as a group are more variable. 3. 3. The “third metabolic type” of von Bertalanffy and other does not exist.