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Oxygen and the Hatch of Eggs and Development of Larvae of Aphelenchoides Composticola and Ditylenchus Myceliophagus

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For more content, see Nematology.

The minimum oxygen concentration for the optimum hatch of eggs of Aphelenchoides composticola was 1.5 % and for Ditylenchus myceliophugus, 2 %. This result probably reflects the difference in the size of eggs of each nematode rather than a difference in the affinity for oxygen of the enzymes at the sites of terminal oxidation in each species. The maximum rate of development of both nematodes occurred at concentrations of oxygen greater than 5 %. The ecological implications of the higher requirement for oxygen for development of larvae than for hatch of eggs are obscure. The increased demand for oxygen during development may occur because of the greater energy requirements of the larvae and adults. Evidence from this study supports a hypothesis that a cytochrome system is involved in the respiration of these nematodes. Results also indicate that concentrations of oxygen sufficiently low to prevent hatch of eggs or subsequent development of larvae will occur only in scattered, localised sites in most arable soils.

Affiliations: 1: Department of Agricultural Botany, The University of Sydney, New South Wales, Australia


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