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Working Paper Fisheries and the Prisoner's Dilemma Game: Conditions for the Evolution of Cooperation among Users of Common Property Resources(1987) Berkes, Fikret; Kence, Aykut"Recent studies using Prisoner's Dilemma framework have led to a theory of cooperation based on repeated encounters and the development of reciprocity. The theory is applicable to a diversity of disciplines and has implications fort he use of common property resources such as fisheries, i.e. what are the conditions under which the users of a fishery resource will cooperate to avoid, what some consider, the inevitable 'tragedy of the commons'? The Prisoner's Dilemma approach helps formalize some of the recent theoretical developments on conditions of successful common property use. In particular, it offers insights regarding the importance of probability of encounter among users, development of reciprocal relations among them, the number of users in an area and the degree of crowding, heterogeneity of user groups, the importance of local residency, and the supply-demand characteristics of the resource."Journal Article Preliminary Impacts of the James Bay Hydroelectric Project, Quebec, on Estukarine Fish and Fisheries(1982) Berkes, Fikret"Flow alterations related to hydroelectric development have affected both the fish stocks and the Cree Indian subsistence fishery in the lower LaGrande River, northern Quebec. Evaluated against several years of baseline data, thei nitial biological impact of the project on fish populations, mostly whitefish (Coregonus clupeaformis) and cisco (C. artedii), appeared to be relatively small. Nevertheless, fishing activity in the lower river and the estuary largely ceased from 1979 to 1981, due to physical modifications of traditional fishing areas and other social and economic effects related to the hydro project. Some fishermen modified their methods and continued harvesting in the affected area, but others abandoned the affected area and fished lakes and rivers along the recently constructed road network. It is concluded that earlier impact assessments fell short of predicting these impacts."