I have trait data and would like to look at whether traits are more convergent or more divergent compared to a null community. I think the best way to do this is to maintain the same species richness and total abundance as the original communities but can't seem to find a way to do this when using abundance data. Any thoughts?
There are some studies working on some points you raised. There are solutions concerning abundance and null models performance.
http://www.cfbiodiv.org/userfiles/Kraft2007_%20Trait%20evolution,%20community%20assembly.pdf
http://www.irstea.fr/sites/default/files/ckfinder/userfiles/files/Schleuter_et_al_2010.pdf
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2435.2010.01695.x/full
http://onlinelibrary.wiley.com/doi/10.1890/07-1206.1/abstract
http://onlinelibrary.wiley.com/doi/10.1111/j.1654-1103.2009.01042.x/full
Null models:
http://onlinelibrary.wiley.com/doi/10.1111/j.1466-8238.2011.00682.x/full
http://onlinelibrary.wiley.com/resolve/reference/XREF?id=10.1007/s00442-014-3170-9
http://onlinelibrary.wiley.com/doi/10.1111/jvs.12031/full
There are some studies working on some points you raised. There are solutions concerning abundance and null models performance.
http://www.cfbiodiv.org/userfiles/Kraft2007_%20Trait%20evolution,%20community%20assembly.pdf
http://www.irstea.fr/sites/default/files/ckfinder/userfiles/files/Schleuter_et_al_2010.pdf
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2435.2010.01695.x/full
http://onlinelibrary.wiley.com/doi/10.1890/07-1206.1/abstract
http://onlinelibrary.wiley.com/doi/10.1111/j.1654-1103.2009.01042.x/full
Null models:
http://onlinelibrary.wiley.com/doi/10.1111/j.1466-8238.2011.00682.x/full
http://onlinelibrary.wiley.com/resolve/reference/XREF?id=10.1007/s00442-014-3170-9
http://onlinelibrary.wiley.com/doi/10.1111/jvs.12031/full
Dear Elizabeth,
Can you look at this study done by Bell in 2000 ? I think it is helpfull for your case.
Hi Elizabeth, you may use the SPACODI package in R.
https://cran.r-project.org/web/packages/spacodiR/index.html
It allows you to use both presence/absence and abundance data including both functional and phylogenetic information. The different null models that can be used in SPACODI are explained in detail in Hardy (2008).
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2745.2008.01421.x/abstract
There is also a stand-alone version of the software that runs in windows http://ebe.ulb.ac.be/ebe/SPACoDi.html (I never used it though).
Best regards
Marcelo
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