Analyzing habitat selection in animals without well-defined home ranges

S. M. Arthur and colleagues presented a statistical framework that allows h abitat availability to change for each observation of an animal, thus makin g habitat-use analysis possible when the habitat changes or it is difficult to determine a home range for each individual. I here modify their method by letting habitat availability vary on a continuous scale, rather than def ining the area within a circle as equally available. The modified method al so makes it possible to deal with continuously varying time intervals betwe en observations and the influence of environmental variables (e.g., tempera ture, time of day) on movement activity. As an example, I use this method t o analyze habitat selection of a bush-cricket (the wart-biter, Decticus ver rucivorus).