Lilith,

>> No the big mystery is the Tukey test. I just can't find the mistake, it
>> keeps telling me, that 
>> there are " less than two groups"
>> ...
>> ### Tukey test ## 
>> summary(glht(PAM.lme, linfct = mcp(Provenancef = "Tukey"))) 
>>
>> Error message: 
>> Fehler in glht.matrix(model = list(modelStruct = list(reStruct =
>> list(Code  .808654423456211,  : 
>>  ‘ncol(linfct)’ is not equal to ‘length(coef(model))’

You need to look, in particular, at what's in your variable "Provenancef." 

##
PAMdata$Provenancef
levels(PAMdata$Provenancef)

And if the call to glht() is returning an object you need to inspect
obj$linfct. It contains the contrast matrix (for Tukey contrasts) and needs
to match the number of coefficients in your model. Try the following for
further clues:

glht(PAM.lme, linfct = mcp(Provenancef = "Tukey"))$linfct
coef(PAMaov)

Regards, Mark.
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