Ecosystems are thus phenotypic and functional images of our environment and are divided up and delimited in different ways. New concepts such as agricultural ecosystems, urban ecosystems, etc... are now coming to be accepted. Together with natural, nearly natural and seminatural ecosystems they provide the pattern which makes up a landscape.

Universitas: A Quarterly German Review of the Arts and Sciences, Volume 26, Number 2, 1984 (p. 88)