what is needed? raster maps of the study area, can be obtained by a different software like arcgis....
TRANSCRIPT
![Page 1: What is needed? Raster maps of the study area, can be obtained by a different software like ArcGis. -Raster map of the location of the target species (.csv](https://reader036.vdocument.in/reader036/viewer/2022082712/56649ccf5503460f9499b662/html5/thumbnails/1.jpg)
What is needed?• Raster maps of the study area,
can be obtained by a different software like ArcGis.
• -Raster map of the location of the target species (.csv format).
• -Raster maps that contains the continuous values for each descriptive variable (.asc format).
• Each cell of the location map raster can be associated to a vector whose components are the measured variables in the underlying.
REMEMBER ALL RASTER HAVE TO BE THE SAME EXTENT AND THEY HAVE TO BE GRIDS BEFORE THEY BECOME ASCII.
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To run ENFA
• In R, we need to load the adehabitat and ade4 packages. Developed by Clement Calenge in 2006, designed originally for animal habitat selection.
• Adehabitat contains more than a 100 functions giving tools (including ENFA)frequently used in ecology.
• Very good graphical output.
![Page 3: What is needed? Raster maps of the study area, can be obtained by a different software like ArcGis. -Raster map of the location of the target species (.csv](https://reader036.vdocument.in/reader036/viewer/2022082712/56649ccf5503460f9499b662/html5/thumbnails/3.jpg)
Marginality and specialization
Marginality (deviation from the global mean) values ranges between 0 to 1. Values close to 1 means that the species have a habitat preference.
If specialization (niche breadth) is occurring, any values exceeding (or close to) one indicate some form of specialization.
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Today’s exercise
• Load adehabitat and ade4• Download the files• Run ENFA for all the individuals• Run ENFA for each stage• Analyze the outputs
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Diststreams contribute the most to the marginality. This plant is found more likely in areas close to streams.
DEM and Canopp contribute the most to the specialization.