GLMM for data with many zeros: poisson, lognormal-poisson or zero-inflated?

I am sorry, one of the colummns of the example data was oddly
displaced. Here it should be right (I hope).

rev         site        species  repl        cover     treat      seedlings

1             1             0             1             low        A
         3

1             1             0             1             low        C
         0

1             1             0             1             low        E
          0

1             1             0             2             low        A
         5

1             1             0             2             low        C
         0

1             1             0             2             low        E
          3

1             1             0             3             high       A
         1

1             1             0             3             high       C
         0

1             1             0             3             high       E
          0

1             1             0             4             high       A
         0

1             1             0             4             high       C
         0

1             1             0             4             high       E
          0

1             1             1             1             low        A
         2

1             1             1             1             low        C
         0

1             1             1             1             low        E
          4

1             1             1             2             low        A
         0

1             1             1             2             low        C
         0

1             1             1             2             low        E
          1

1             1             1             3             high       A
         0

1             1             1             3             high       C
         0

1             1             1             3             high       E
          0

1             1             1             4             high       A
         2

1             1             1             4             high       C
         0

1             1             1             4             high       E
          0

1             2             0             1             low        A
         0

1             2             0             1             low        C
         0

1             2             0             1             low        E
          0

1             2             0             2             low        A
         0

1             2             0             2             low        C
         0

1             2             0             2             low        E
          0


Alicia Vald?s Rapado
PhD Student
Dpto. Biolog?a Organismos y Sistemas - Unidad de Ecolog?a
Universidad de Oviedo
Espa?a - Spain
e-mail: valdesalicia.uo at uniovi.es