zu Forschungsansätzen in Grenz- und Übergangsbiotopen vgl.: Matthew M. Yarrow & Victor H. Marin (2007): Toward Conceptual Cohesiveness: a Historical Analysis of the Theory and Utility of Ecological Boundaries and Transition Zones. Ecosystems 10: 462–476. doi:10.1007/s10021-007-9036-9