I would like to use the package "ecodist" to compute Mantel correlograms
for particular variables for each of 6 different time points. Each sample
at each time point has  unique x and y coordinates on a plot. I have saved
a test file as a matrix, and can read in R that "x" and "y" as well as my
variables of interest are all present in the matrix file.

I just don't know how to write the command for a Mantel correlogram for
(e.g.) Cmic (one variable) for a particular sampling date, as well as Cmic
for all 6 sampling dates (which, if they could be plotted all on one graph
would be super.)

The point of this is to see how Cmic (and other variables) changes in both
space and time over my plot. I will then look at other belowground
variables and aboveground plant biomass data for each date in the same way.

I'm not even sure Mantel correlograms are the best choice here, but sadly,
my lag distances for my samples aren't close enough together for me to get
nice semivariograms. Originally I had hoped to have both conventional stats
for changes over time coupled with maps to show changes in space at each
time point. It was suggested to me that Mantel correlograms would be an
alternative way to visualize spatial variability on my plot.

I apologize in advance for my clumsiness with R. I have read the Legendre
and Goslee papers, have studied (as best I can) both the books and the
online info for this package, but since I have no (absolutely NO)
experience with program languages, the help is often impenetrable to me.

Any and all suggestions most welcome!

Thanks very much -Kathy

-- 
Kathleen Regan

University of Hohenheim

Institute of Soil Science and Land Evaluation

Soil Biology Section

Emil-Wolff-Str. 27

D-70593 Stuttgart-Hohenheim

"Traveler, there is no road. We make the road by walking."

phone: +49(0)711 459 23118

fax: +49(0)711 459 23117
E-mail:kath.regan@gmail.com

	[[alternative HTML version deleted]]

