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A method for summarising the degree of spatial covariance (intra-plot correlation) among different plant species using plant abundance data is presented. The method will provide an alternative test of the hypothesis of neutrality in uniform environments, and we apply it in this study to data derived from two different grasslands. There is a significant positive intra-plot correlation in both grasslands...
A transgenic Arabidopsis thaliana genotype, which produce a significant amount of dhurrin in the leaves and consequently is resistant to the flea beetle Phyllotreta nemorum, fitted a hyperbolic seed production—density regression significantly different from the isogenic non-modified wildtype. The cumulative seed production per area of the transgenic genotype was significantly lower at the highest...
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