1494GEOSTATS: sampling methods question
- Feb 21, 2000Hello.
I've been watching this list for only a short time and I hope someone
out there may be able to help me. I'll try to be brief.
I am looking at patterns of parasitic plant infection on tree hosts. I
would like to address questions such as: Are infected individuals
clustered? If so, at what scale? Is the clustering related to host
distribution or size? to underlying habitat heterogeneity? What is the PDF
of the seed distribution with respect to the parents? Are seed deposition
rates a good proximate measure of the infection rates? I am examining
processes and mechanisms of parasite transmission in other experiments and
observations of vector behavior. And I hope to integrate both parts into a
model of parasite transmission and spread.
I have mapped (ARCVIEW) trees, parasites and seeds (infective
propagules) on approximately 4 hectares (about 900 trees) using GPS. I'm
not sure this is a large enough scale at which to detect patterns. I am
wondering if there is a way to further subsample at a larger scale
(complete mapping at a larger scale is too time-consuming right now). Given
that I need to sample several non-contiguous areas for another part of the
project (before my field season ends and before I will be able to analyze
what I already have), perhaps I could choose locations that I could use for
the spatial analysis as well. For example could I use the plot I have
mapped and sample at different lag distances? Would I have to sample in
concentric circles or could I just sample points? What would be a point? 50
trees? 1 tree? in a circle? line?
Thank you very much. I would be grateful for any suggestions.
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