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THE CALORIFIC VALUE OF CAENORHABDITIS ELEGANS (RHABDITIDAE) BY W. L. NICHOLAS and AIMORN CHAICHARN STEWART Department of Zoology, Australian National University, Canberra, ACT, Australia The calorific value of populations of Caenorhabditis elegans was measured by bomb-calorimetry. A value of 27.59 kj per g ash-free dry weight was obtained (= 6,316 calories per g). This value is high, but agrees well with calculations based on previously published analyses of lipid and glycogen reserves in Caenorhabditis sp. It is suggested that when harvested from a rich culture of bacteria Caenorhabditis has substantial lipid reserves accounting for its high calorific value. The calorific equivalent of an animal, or a population of animals, is important in ecological energetics. Cummins & Waycheck (1971) discuss its significance, and tabulate values of the calorific equivalents published by many authors for a great variety of organisms. No free-living nematode was included in their tables, but three estimates have since been published. Each of the authors used a micro- comb calorimeter to measure the calorific value, which was expressed as calories per g ash-free dry weight of the population, comprising nematodes at all stages of development. Yeates (1971) reported populations of Plectus sp. and Poikilolaimu.r sp. as
Nematologica – Brill
Published: Jan 1, 1978
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