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Published online by Cambridge University Press: 08 April 2016
Cowen and Stockton (1978) seem to agree with one of our main conclusions (Mark and Flessa 1977, p. 21): “Problems of ecological classification, taxonomic consistency and temporal and geographic scale need resolution before evolutionary equilibrium models can be more than heuristic.” Their discussion points out other difficulties with hypotheses of evolutionary equilibrium and with tests for their validity.