[R-sig-ME] modeling question

Joaquín Aldabe joaquin.aldabe at gmail.com
Mon Jan 16 20:06:17 CET 2017

Dear all, I'm interested in modeling the effect of invertebrate biomass on
the density of a grassland shorebird (they eat invertebrates). For this, I
picked 8 plots and sampled invertebrates and birds 6 times in each plot for
about 30 days. This is, I went to each plot and did repeated measures of
invertebrates biomass and shorebird density separated in time by four or
five days, as invertebrates biomass may change over time and it is expected
that birds density change accordingly.

So, I'm trying to see a general pattern of the effect of changes in biomass
on the density of this shorebird species at a plot scale. Plot identity is
not important; I consider them as particular events of a random process.

Is this model correct:

lme(Bird.density~Invertebrate biomass, random=~1|Plot_identity, data=)

Thank you very much,


*Joaquín Aldabe*

*Grupo Biodiversidad, Ambiente y Sociedad*
Centro Universitario de la Región Este, Universidad de la República
Ruta 15 (y Ruta 9), Km 28.500, Departamento de Rocha

*Departamento de Conservación*
Aves Uruguay
BirdLife International
Canelones 1164, Montevideo


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