Science Environment for Ecological Knowledge
Ecoinformatics site parent site of Partnership for Biodiversity Informatics site parent site of SEEK - Home
Science Environment for Ecological Knowledge









 

 

 



Analytical Components

Difference between version 19 and version 15:

At line 32 added 7 lines.
+ ;__Site by species matrix__:
+ ** ''Citation:'' From Beam Working Group meeting ([BeamKnowledgeRepSept04])
+ ** ''Description:'' In the matrix, every row is a site, like a different quadrat, every column is a different species in the matrix, the value could be abundance, but typically is just species/absence (1 or 0's). Then, if you sum across the row, you know the number of species, e.g.. There might be also be a separate set of columns for location of the plot. You can then compute/estimate, via re-sampling (different algorithms for this), the species-area curves. Also, the goal is to capture the abundance, not just the presence/absence ... you want to use the abundance when possible. Also, there are tons of uses of these matrices. Abundance measured in various ways: relative and absolute, you can compute relative to absolute but not the other way; total biomass is an absolute / percent cover is a relative. Relative: hits, cover, touches. Absolute: count stems, biomass.
+ ** ''Application:'' Given any marked up dataset, we should be able to construct one of these matrixes automatically.
+ ** ''Caveat:'' The species area curves are really used within a decision making context typically... You want ways to analyze the species/area relationship varies with productivity.
+
+

Back to Analytical Components, or to the Page History.