On the nutrition and metabolism of zooplankton. IV. The forms of nitrogen excreted by Calanus
Corner, E.D.S. and Newell, B.S. (1967) On the nutrition and metabolism of zooplankton. IV. The forms of nitrogen excreted by Calanus. Journal of the Marine Biological Association of the United Kingdom, 47 (1). pp. 113-120.
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A study has been made of the nitrogenous compounds excreted by Calanus helgolandicus (Claus) collected at Plymouth. Most of the excreted nitrogen is in the form of ammonia which accounts for 6o-roo % (average 74'3 %) of the total, and some of the remainder may be lost as urea. There is no evidence for the excretion of measurable amounts of amino acids. Whether the animals are starved or fed they are primarily ammonotelic, andthe quantity of ammonia produced at roO C (3'33 jtg/mg. dry body wt/day) is not significantly changed when the animals are used at an abnormally highexperimental density. This latter condition does, however, lead to the production of large quantities of additional nitrogenous substances that give a positive reaction with ninhydrin.
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