The Contiguity of Upslope and Downslope Boundaries of Species in a Zoned Community

Abstract

A method is presented testing whether the downslope boundary of 1 sp. in a zoned community is followed by the upslope boundary of another significantly often. The test is applied to data collected on transects through zoned communities of marine algae. The number of contiguities of downslope and upslope boundaries is not generally significantly greater than the number expected on a transect. The proportion, 110/139, of transects with more contiguities than expected is significantly greater than 1/2.