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Fungal Diet and the Morphometric Relationships in Aphelenchus Avenae

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Measurements of seven morphological characters were taken from 20 females of Aphelenchus avenae fed on each of 43 fungi. The data were subjected to multivariate analyses. In the Principal Components analysis which included log population density, the first two axes accounted 83% of the variation. Axis I was essentially a size axis from which log density was virtually eliminated, Axis II was also a size axis: however log density had an appreciable weight that went hand-in-hand with body length but was not otherwise size sensitive. The same analysis without log density promoted pure size accounting for 80% of the total variation. In the Canonical analysis log density was excluded because the value of this character was constant within any one group. The first axis of variation reflected pure size while the second reflected robustness.

Affiliations: 1: Agriculture Canada, Research Station, Vineland Station, Ontario, Canada; 2: Department of Zoology, Trinity College University of Dublin, Dublin, Eire


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