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Buffer zones for biodiversity of plants and arthropods: is there a compromise on width?

Model 16 Generalised linear model for analysing the possible correlation between arthropods and between arthropods and total number of dicotyledonous species. In order to avoid that the possible correlation was introduced by the difference between treated and untreated plots the model include the effect of treatment as fixed factor as well as possible significant effect of field. The model also allowed the correlation to depend on weather the plot were treated or untreated. The unreduced model may be written as:

Model 16 Generalised linear model for analysing the possible correlation between arthropods and between arthropods and total number of dicotyledonous species. In order to avoid that the possible correlation was introduced by the difference between treated and untreated plots the model include the effect of treatment as fixed factor as well as possible significant effect of field. The model also allowed the correlation to depend on weather the plot were treated or untreated. The unreduced model may be written as:

For the relation between species of arthropods and plants the total number of dicotyledonous species was used as the covariate while the number of butterflies was used as the covariate for the relations between different groups of arthropods.

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Version 1.0 November 2009, © Danish Environmental Protection Agency