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Opportunity for natural selection among three migrant groups of fishermen of Puri, India.

Abstract Pregnancy histories of 470 ever‐married women aged 40 years and older from three endogamous groups of marine fishermen of Puri, Orissa, are analyzed to estimate Crow's index of opportunity for selection. All these populations are migrants. The value of I ranges from 0.63 to 1.08. The results are interpreted in the light of their ethno‐historical, migratory backgrounds, degree of isolation, and population sizes. A comparison with published Indian data is also made.