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Population Development and Oxygen Consumption of Three Isolates of Aphelenchus a Venae (Nematoda: Aphelenchidae)

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For more content, see Nematology.

Three populations of Aphelenchus avenae differed in rates of population growth, but had similar rates of oxygen consumption (QO2) at 30°C which varied little with the age of culture. The QO2 of isolates increased linearly with temperature but Arrhenius plots (Log. QO2 vs 1/°K) showed "intersecting" type discontinuities around 25°C in two U.K. isolates, ic and F; an amphimictic isolate, M, from Malawi showed a discontinuity below 20°C. Arrhenius plots of population growth rates between 10°C and 30°C showed similarities with the QO2 data, confirming the occurrence of "thermotypes" in A. avenae. The Malawi isolate was very sensitive to low temperature. The QO2 of all isolates at 23°C was unchanged after 48 hours but at 30°C differences were seen after 24 hours.

Affiliations: 1: Imperial College at Silwood Park, Ashurst Lodge, Sunninghill, Ascot, Berks., SL5 7DE, U.K.


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