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Insect retention probability. Mean (±s.e.) retention rates of two fly species (the blow-fly Calliphora vomitoria and the fruit-fly Drosophila melanogaster) and two ant species (the big ant Polyrhachis pruinosa and the smaller one Camponotus schmitzi) in the fluids of different age categories (Y = young, M= middle age, O = old) of four Nepenthes species and a water control. Numbers above columns indicate the sample size.
