[R-sig-eco] Multivariate analysis

[Jakub Szymkowiak]

Hi Edith,
you should read also about some direct gradient analysis, for example 
canonical correspondence analysis (CCA).

Greetings,
Jakub




-----Oryginalna wiadomość----- 
From: Marcelino de la Cruz
Sent: Monday, November 14, 2011 9:19 AM
To: Edith Lachance ; r-sig-ecology at r-project.org
Subject: Re: [R-sig-eco] Multivariate analysis


Hi Edith,

Maybe you could find some ideas here:
    * Hooper, E.R., P. Legendre and R. Condit.
2004.
<http://www.bio.umontreal.ca/legendre/reprints/Hooper_Ecology.pdf>Factors
affecting community composition of forest
regeneration in deforested, abandoned land in Panama. Ecology 85: 3313-3326



HTH,

Marcelino


At 15:57 11/11/2011, Edith Lachance wrote:
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>Dear all,
>
>I am doing a master degree in forestry and I
>have in my possession floristic composition (%
>cover of understory plants) of plots that are
>settled in two types of environment (one in an
>open env. and another in a more closed env.).
>The plots are paired together and are part of a
>hierarchical design. The hierarchy goes this
>way: three sectors within which there is 5
>clearcuts per sector, and within each of the 5
>clearcuts there are 6 pairs of plots (one plot
>in an retention tree group [the closed env.] and
>another in the adjacent clearcut zone [the open env.]).
>
>I wish to perform a multivariate analysis to
>find out which species are associated with the
>retention tree group and which ones are
>associated with the clearcut area. The problem
>is that I don't know which type of multivariate
>analysis I should use, would anyone have some
>advice? Moreover, I don't know if I can insert
>my hierarchical design into the multivariate
>analysis or if the two types of environment can
>act as a gradient in the analysis.
>
>Thank you for your time and consideration,
>
>Edith Lachance, Biol.
>Candidate à la maîtrise en sciences forestières
>Département des sciences du bois et de la forêt
>Université Laval, Québec
>
>
>
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____________________________________

Marcelino de la Cruz Rot
Depto. Biologia Vegetal
EUIT Agricola
Universidad Politecnica de Madrid

tel: 34 + 913365435
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