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Size, dry weight, ash, and concentration of C, H, N, P, and Ca of Daphnia hyalina from Lago Monate (northern Italy) have been investigated. The concentration of the elements varies with age of the individuals. Eggs have the maximum concentration of C and H, the new‐born of P, and the young of N. No seasonal variation was observed for individuals of the same size.
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Baudouin et al. (1972) studied this question.
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