I am using Redundancy analysis to explore the effect of plant community composition on invertebrate abundances (log-transformed values) within sampling sites.  I am using the vegan package in R and have been getting a result where my plant community explains more than 60% of the variation in the invertebrate community, but is not significant (through anova.cca function).  When I use an environmental matrix to explain the invertebrates, it explains much less variation but is usually significant.  I'm wondering that since my plant community is based on presence/absence, if this is what is causing the issue.  I would appreciate any suggestions or direction to help with this.  

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