The Relationship of Oxygen Diffusion Rates To the Survival, Movement, and Reproduction of Hemicycliophora Arenaria

Publisher： Brill

ISSN： 1875-2926

Source： Nematologica, Vol.9, Iss.4, 1963-01, pp. : 605-612

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Abstract

The platinum-microelectrode technique for measuring oxygen diffusion rates in water films was used to determine the oxygen availability at the interface between the solution in which the nematodes reside and the air in the pore spaces. Established populations of Hemicycliophora arenaria on tomato plants were exposed to oxygen diffusion rates from 4 to 40 × 10^-8 g cm^-2 min^-1 for one month. There was a linear relationship between oxygen diffusion rates of 10 to 40 × 10^-8 g cm^-2 min^-1 and numbers of nematodes recovered from the soil. As the oxygen availability increased in the soil, so did the nematode populations. In vitro studies showed that egg production, nematodes in the process of molting, and survival of the males were the phases most sensitive to insufficient oxygen supply. These were followed closely by inhibition in egg hatching. The movement and survival of the 4th-stage female larvae and the females were least influenced by low levels of oxygen.