Diversity effect on growth and herbivore damage.

<p>Summary of results from generalized linear mixed models testing for the effects of (a) big-leaf mahogany (<i>Swietenia macrophylla</i> King, Meliaceae) genotypic diversity and (b) tree species diversity on mahogany growth and damage by the specialist <i>Hypsipyla grandella</i> (number of attack sites per plant). We tested the effect of mahogany genotypic diversity by comparing genotypic monocultures to genotypic polycultures, whereas to test for a species diversity effect we compared genotypic monocultures and species polycultures. F-values and associated significance levels (<i>P</i>) are shown, as well as numerator and denominator degrees of freedom (subscripts).