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A Multiple Regression Model for the Respiratory Activity of Soil Nematodes

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For more content, see Nematology.

On four dates (P) within one year, nematodes were extracted from soil samples taken from deciduous woodland. The respiratory rates (R) of nematodes of seven size classes (W) were measured at six temperatures (T), at three soil moisture levels (C) and on four different days (D) following their extraction from the soil. The results from the 288 combinations of experimental conditions for each size class were used to produce a multiple regression model, including 12 significant partial coefficients, by a stepdown elimination procedure. The model indicates that: the value of the regression coefficient 'b' between respiratory rate and nematode weight, is temperature dependent; the respiratory rate of nematodes shows temperature acclimation during the year which makes reliance upon temperature corrections from Krogh's normal curve undesirable; it is important to measure nematodes' respiratory rates immediately following their extraction; the respiratory rate of nematodes is related to soil moisture levels implying that caution must be exercised in the use of respiratory data based upon free swimming nematodes.

Affiliations: 1: Luton College of Higher Education, Bedfordshire, England


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