Speciation in Fishes Distribution in Time and Space of Seven Dominant Multiple Alleles in Platypoecilus maculatus
1947; Elsevier BV; Linguagem: Inglês
10.1016/s0065-2660(08)60484-8
ISSN0065-2660
Autores Tópico(s)Genetic diversity and population structure
ResumoThis chapter discusses the genetics of speciation in seven dominant multiple alleles in Platypoecilus maculates (P. maculates). The pattern names and the genetic symbols used for them are as follows: one-spot (Po), twin-spot (PT), crescent complete (PCc), moon complete (PMc), crescent (Pc), moon (PM), and comet (PCo). The patterns have been used as indices in the analysis of the genetic composition of natural fish populations of the Rios Jamapa, Papaloapan, Coatzacoalcos and Usumacinta of Mexico, and Guatemala. The genes are Po, PM, PMc, Pc, PCc, PCo, PT, and P+ the recessive. The entire series of seven patterns is found only in the platyfish populations of the Rio Papaloapan. The Rio Jamapa platyfish lack the genes PM and PMc. The platyfish of the Rios Coatzacoalcos and the Usumacinta lack Pc and PCo but these populations may be distinguished on the basis of the frequencies of their other genes. All seven patterns are formed by precise groupings of many small melanophores. Fortunately, the melanic patterns so produced arc unaffected by the preserving fluids. As a result, it has been possible to utilize and examine collections of P. maculatus in various museums, and classify the fish with respect to this and other series of heritable patterns. In this way a comparison of their gene frequency distributions at various time levels has been made of population from the same general area; some collections were taken 70 years apart.
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