"A similar term exists in linguistics and mathematics. An ecocline, or biological cline, is a related concept; however, may be better placed as a child of a class like \"ecotone\"."^^ . . "2013-10-06T20:10:13Z"^^ . "pbuttigieg"^^ . . "A cline is a comparatively thin, typically horizontal layer within a fluid, in which a property of the fluid varies greatly over a relatively short vertical distance."^^ . "ENVO"^^ . "ENVO:01000258"^^ . "cline"^^ .