[R-sig-eco] Characterizing direction and magnitude of community change in response to a continuous predictor?

[Pedro Pequeno]

Hi Brian,

a simple approach would be to summarize species composition using some
ordination method (e.g. PCoA) and then use it as a response variable
in a linear model where the predictors would be the environmental
gradient and region. Therefore, you could explicitly test for an
interaction between gradient and region, i.e. whether the response of
species composition to the gradient changes across regions. The
resulting slopes could be a measure of direction and magnitude of
change.

Cheers,

Pedro

Em ter., 7 de jun. de 2022 às 13:19, Brian A. Gill
<gillbriana using gmail.com> escreveu:
>
> Hi R-sig-ecology.
>
> Sorry if this question is vague.
>
> How can we characterize the direction and magnitude of change of biological
> communities (species by site matrix or derived matrix of distances) in
> response to a continuous environmental predictor?
>
> I want to do this for several different regions and be able to compare the
> directions and magnitudes of community changes among regions.
>
> Maybe this is as simple as using a correlation coefficient...
>
> Any help is much appreciated.
>
> Thanks.
>
>
> Brian
>
>
>
> --
> Brian A. Gill, Ph.D. (He/Him)
>
> Postdoctoral Research Associate
> School of Natural Resources and the Environment
> University of Arizona, Tucson, Arizona, USA
> www.BrianGillPhD.com
>
>         [[alternative HTML version deleted]]
>
> _______________________________________________
> R-sig-ecology mailing list
> R-sig-ecology using r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology