title: Salt marsh vegetation: Latitudinal gradients in the zonation patterns.
abstract: Zonation patterns of salt marsh vegetation were examined at latitudes ranging from 44°40'N at Halifax, Nova Scotia, to 58°50'N at Churchill, Manitoba. It was found that in all areas examined the landward boundaries of the species' zones were more nearly coincident (i.e., more clustered) than their seaward boundaries. A conspicuous latitudinal trend was found: the clustering of both landward and seaward boundaries increased with increasing latitude. Evidence that between-species competition influences the locations of zone boundaries was also obtained. Possible implications of the results in terms of a relationship between intrapopulation polymorphism and latitude are discussed.
authors.affiliation: Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: E C
authors.initials: EC
authors.lastname: Pielou
authors.affiliation: Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: R D
authors.initials: RD
authors.lastname: Routledge