Minimum AIC mixed model selection

Hi!

I am trying to know which habitat variables most affect bird counts in a
radius of 100m. I obtained bird counts in 2751 spatial points, and measured
percentage of 21 habitat variables in these points.

I am applying a mixed model using the ?lmer? function to the data, but I do
not know how to select the best model using AIC here. Is there a way to do
this automatically with R?


Thank you for any help!

Silvia

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