Changes in Prey Populations (recent appear at top)

Duffy and Wissel. 1988. Models of fish school size in relation to environmental productivity. Ecological Modeling. 40: 201-211

Duffy, D. C. 1988. Predator-prey interactions between common terns and butterfish. Ornis Scandinavica. 19: 160-163

Duffy, D.C., R.P. Wilson, and M.P. Wilson. 1987. Spatial and temporal change in the diet of the Cape cormorant off the coast of Southern Africa. The Condor. 89: 830-834

Duffy, D.C., Wilson and Berruti. 1985. Anchovy in the diets of Dyer Island Penguins: a tests of two models of anchovy distribution. South African Journal of Science. 81: 552-554

Ricklefs, Duffy and Coulter. 1984. Weight gain of blue-footed booby chicks: an indication of marine resources. Ornis Scandinavica. 15: 162-166

Duffy. 1983. The foraging ecology of Peruvian seabirds. Auk. 100: 800-810

Duffy, D. C. 1983. Environmental uncertainty and commercial fishing: effects on Peruvian Guano birds. Biological Conservation. 26: 227-238

Duffy, D.C. and L.J.B. Laurenson. 1983. Pellets of Cape cormorants as indicators of diet. Condor. 85: 305-307

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