Toward a Unified Ecology (Paperback)
Columbia University Press, 9780231069199, 384pp.
Publication Date: September 23, 1993
Offers the best general summary of the field, with a view toward fostering common disciplinary goals. Allen and Hoekstra begin with hierarchy theory as a basic premise and explain that the conventional 'levels' (ecosystems, landscapes, communities, populations, organisms) are not levels in themselves but criteria for observation.