[R-sig-ME] Beta-binomial distributions with lmer?

[Christine Griffiths]

Hi R users,

Just a query as to whether lme4 can handle beta-binomial distributions as I 
read that this was not available.

If not, any suggestions on how to handle such a distribution to plot the 
following model:
y<-cbind(Biotic,Abiotic)
m1<-lmer(y~Treatment+Month.rain+(1|Month)+(1|Block/EnclosureID/Quadrat))

y referring to percentage cover of biotic matter.

Cheers,
Christine