Assessment of animal movement patterns around features which are avoided?

Discussion created by kkober on Jul 8, 2011
Hi all,
I've got a bit of a tricky question and probably did not describe it very well in the title.
I am working with seabirds in the marine environment. My question right now is: which marine areas are within reach of the seabirds when they are at their colony if we assume that they avoid flying over land.
I know the maximum distance they can go in a straight line (e.g. 300km), and at first I simply used a buffer of this size around the colony to determine a flight range. However, that does not take into account that they won't fly over land, which would probably alter the resulting marine areas quite a bit.
Is there any way of generating a foraging range by taking the avoidance of areas into account?

Thanks for your help!