Dear List,

I am using the package adehabitat to analyze the movement patterns and home range of the manta ray (Manta birostris) in Hawaii.  The manta rays in this study stayed close to shore, often feeding along the shore line or in small bays.  Since they can not go on land (being fish) their home range is obviously limited to the ocean area.  In calculating home range statistics, is there a way to limit the avalible area to the ocean.  I have read through the papers on Adehabitat but have not found a way to limit the area. The closest I have found is the function buffer().  Have I missed something?  Is there a way to constrain the movements so that kernels will only be computed for data points located in the ocean?

I appreciate your help and guidence.

Tim Clark
PhD Student 
University of Hawaii
Honolulu, HI 96816



      
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