[Biomod-commits] using Migration

Wilfried Thuiller wilfried.thuiller at ujf-grenoble.fr
Fri Sep 7 10:14:51 CEST 2012

Hi Viorel,

It has been a long time I did not have a look at this function. 
What is the resolution of your data? 
Just for a first try, what does it happen if you set MaxMig at 0. 


Le 6 sept. 2012 à 20:04, Viorel Popescu a écrit :

> Hi everyone,
> I have a few questions about using Migration and how/if it feeds into the Biomod.RangeSize function. I produced current and future distributions using Ensemble.Forecasting, but now I would like to add more realism using the Migration() function and the dispersal parameter MaxMigr. I understand that the MaxMigr units have to be in decimal degrees, but no matter if MaxMigr = 1000 or MaxMigr = 0.16667, the resulting objects (Future20a1b.Migration in my case) are completely identical in terms of probability values.
> Migration(CurrentPred = Total_consensus_Current[,,2], FutureProj = Total_consensus_Future20a1b[,,2],
> X=LatLong[,1], Y=LatLong[,2], MaxMigr=100, Pred.Save="Future20a1b.Migration")
> Moreover, when trying to plot the Current, Limited Dispersal and Unlimited Dispersal distributions, the latter 2 look identical (again, regardless of the value given to MaxMigr)  
> par(mfrow=c(1,3))
> level.plot(Resp.Var[,'Sp21'], XY=LatLong, show.scale=FALSE, title="current distribution", cex=0.8)
> level.plot(Future20a1b.Migration[,21], XY=LatLong, show.scale=F, title="limited migration", cex=0.8)
> level.plot(Total_consensus_Future20a1b_Bin[,21,2], XY=LatLong, show.scale=FALSE, title="unlimited migration", cex=0.8)
> Am I doing something wrong with Migration? Also, does the information from Migration feed into the RangeSize function? If so, it is not clear to me how...
> Thanks in advance for any advice
> Cheers,
> Viorel
> -- 
> Viorel D. Popescu, PhD
> David H. Smith Conservation Research Fellow
> University of California - Santa Cruz &
> Simon Fraser University, Biological Sciences
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Dr. Wilfried Thuiller
Laboratoire d'Ecologie Alpine, UMR CNRS 5553
Université Joseph Fourier
BP53, 38041 Grenoble cedex 9, France
tel: +33 (0)4 76 51 44 97
fax: +33 (0)4 76 51 42 79

Email: wilfried.thuiller at ujf-grenoble.fr
Personal website: http://www.will.chez-alice.fr
Team website: http://www-leca.ujf-grenoble.fr/equipes/emabio.htm

ERC Starting Grant TEEMBIO project: http://www.will.chez-alice.fr/Research.html
FP6 European EcoChange project: http://www.ecochange-project.eu

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