Nitrogen Output and Ecdysis in Crustacea


IT has been observed1 that nitrogen output in the shore crab, Carcinides, is very low prior to moulting, but begins to increase over the last few days. An indication that it rises sharply after ecdysis has now been confirmed in Asellus aquaticus (Fig. 1). Feeding individuals were isolated in 2 ml. of water at 23 ± 0.5° C.; the water was renewed daily, and its content of ammonia and amino-nitrogen (as in Carcinides the predominant nitrogen-compounds excreted) was estimated by a micro-adaptation of the Sørensen method. Estimates were monitored by the use of Russell's phenate–hypochlorite method2.

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  1. 1

    Needham, A. E., Physiol. Comp. et Oecol. (in the press).

  2. 2

    Russell, J. A., J. Biol. Chem., 156, 457 (1944).

  3. 3

    Needham, A. E., J. Embryol. Exp. Morph., 3, 189 (1955).

  4. 4

    Carlisle, D. B., and Dohrn, P. F. R., Publ. Staz. Zool. Napoli, 24, 69, 279 (1953).

  5. 5

    Nieland, K. A., and Scheer, B. T., Physiol. Comp. et Oecol., 3, 321 (1953).

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    O'Farrell, A. F., and Stock, A., Austral. J. Biol. Sci., 6, 485; 7, 302, 525 (1953–54).

  7. 7

    Needham, A. E., “Regeneration and Wound-Healing” (Methuen, London, 1952).

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