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Taxonomic status and genetic differentiation among West African populations of the Chrysichthys auratus complex (Pisces, Siluriforme), based on protein electrophoresis
Author(s) -
AGNESE J. F.
Publication year - 1991
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1991.tb00512.x
Subject(s) - biology , taxon , genetic divergence , zoology , genetic distance , allele , genus , genetic variation , ecology , genetic diversity , genetics , population , gene , demography , sociology
. Thirteen populations of Chrysichthys auratus longifilis (Pfaff) and C. filamentosus (Boulenger) from five West African drainages were studied using enzymatic protein electrophoresis to estimate genetic differentiation and verify their taxonomic status. Twenty seven alleles were observed at 19 loci. Only five loci were polymorphic. Genetic distance and cladistical analyses based on presences/absences of alleles did not separate the populations in groups corresponding to the two taxa. The maximum genetic distances between two populations (D= 0·112) is lower than the level of maximum divergence observed between conspecific populations of species of the genus in other studies using the same enzymatic systems (D = 0·289 in C. maurus ; D = 0·304 in C nigrodigitatus ). These results confirm those of Risch (1986a) who, using morphological data, considered the two taxa to be synonyms. Genetic variability in several of these populations is also low (0·00