search for: oecologia

...tter understand not just the 'path tortuosity', in an animal's trajectory, but also the scale level at which 'search patterns' occur, i.e. an indirect index of the scale at which habtat resources are 'perceived'. It has already been shown using simulations (Nams 2005; Oecologia 143: 179-188) that the fractal dimension D of a trajectory changes within scales, and that the fractal dimension could be a valuable tool in multiscale analysis of wildlife movement patterns. The adehabitat package, increasingly used as a free-open source alternative in radiiotracking and anima...

I would like to be able to randomise presence-absence (i.e. binary) matrices whilst keeping both the row and column totals constant. Is there a function in R that would allow me to do this? I'm working with vegetation presence-absence matrices based on field observations. The matrices are formatted to have sites as rows and species as columns. The presence of a species on a site is