During sampling, snails retracted into their shells and lay inactive at the bottom of the microcosm and under the tile pieces, confirming unfavorable environmental conditions. Another possible explanation is that the reduced growth observed in the present study may be due to the snails' impaired feeding activity. Indeed, we observed at each sampling that feeding, though not quantified, was markedly inhibited, suggesting that it may indicate a non-palatability of the C. pilulifera to
snails.
During sampling, snails retracted into their shells and lay inactive at the bottom of the microcosm and under the tile pieces, confirming unfavorable environmental conditions. Another possible explanation is that the reduced growth observed in the present study may be due to the snails' impaired feeding activity. Indeed, we observed at each sampling that feeding, though not quantified, was markedly inhibited, suggesting that it may indicate a non-palatability of the C. pilulifera to
snails.
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