BIOCHEMICAL AND CYTOLOGICAL DIFFERENTIATION AMONG CICHLID FISHES OF THE SEA OF GALILEE

Among vertebrates, fishes of the family Cichlidae stand out as an evolutionary success. Cichlids are diverse ecologically and dominate the ichthyofauna of Africa and tropical America. Some species with broad ecological tolerances are widely distributed, while other more specialized forms have very restricted distributions. Members of endemic species flocks may exhibit complex taxonomic relationships because of multiple episodes of ecological convergence. In the great lakes of Africa, high rates of speciation are characteristic of some genera within species flocks (Greenwood, 1974; Kornfield, 1978). Although novel modes of speciation have been repeatedly postulated to explain this apparent diversity (see Fryer and lIes, 1972; Fryer, 1977), the genetic changes associated with cladogenesis have not been studied in a systematic manner. Descriptive cytological studies have indicated that there is limited variation in chromosome number and morphology among Old World species (Jakowska, 1950; jalabert et aI., 1971; Natarajan and Subrahmanyam, 1968; Post, 1965; Thompson, 1976). Similarly, little inter-

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