Hi Kátia,
See adonis function in vegan library (?adonis). I think it could be useful
for your aims.
Cheers.


2011/8/8 Kátia Emidio <kat.emidio@gmail.com>

> Dear all,
> I have a data from inventory of plants in 6 fragmented forests of the same
> size,randomly selected, measured during 3 periods of time, and I'd like to
> know about changes in species composition over time. It is a good idea to
> use NMDS for each period of time
> and then to compare the changes in the ordination diagram?? What kind of
> analysis could be better??
> Cheers,
> Katia
>
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Pedro Higuchi
Departamento de Engenharia Florestal
Centro de Cięncias Agroveterinárias - Universidade do Estado de Santa
Catarina
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