NICHE — Programs for Niche Breadth, Overlap and Hypervolumes

摘要: The concept of niche involves two complementary aspects, one related to the hypervolume occupied by a species or community in ecological space (e.g. Hutchinson 1957, 1978; Feoli, Ganis and Woldu 1988) other pattern resources exploitation competition May 1975a, 1975b, Hulbert 1978, 1981; Pianka Maurer, 1982; Smith Giller 1984; Holt, 1987). Many overlap indices have been proposed used ecologists: some them are frequently equated with coefficient, others can be classified as distance measure (Levins 1968), association (Cody 1974), correlation coefficient (Pianka 1973), information measures (Horn 1966). actual relationship between is not clear. Abrams (1980) specifies that mere resource use does necessarily lead vice versa intensity cannot degree overlap.