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Phylogeny of five Prosopium species with comparisons with other Coregonine fishes based on isozyme electrophoresis *
Author(s) -
Vuorinen J. A.,
Bodaly R. A.,
Reist J. D.,
Luczynski M.
Publication year - 1998
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1998.tb00453.x
Subject(s) - biology , coregonus , genetic distance , zoology , sister group , reproductive isolation , phylogenetic tree , taxon , hybrid , genetic divergence , genetic variation , clade , ecology , genetic diversity , genetics , botany , population , fish <actinopterygii> , fishery , gene , demography , sociology
Phylogenetic relationships of Prosopium gemmifer, P. spilonotus, P. williamsoni, P. cylindraceum and P. coulteri species were determined based on variation at 37 allozyme loci, and compared with Stenodus and nine species of Coregonus . Of the three genera, Prosopium was the most distinct with Nei genetic distances to Coregonus of D =0·55—1·05 and to Stenodus of D =0·58—0·92. Stenodus and Coregonus were closely related but grouped as sister taxa with a mean genetic distance of 0·31 (range 0·22—0·40). These results agree with the degree of morphological differentiation among the genera as well as with observations concerning hybridization, e.g. many Coregonus species hybridize with Stenodus , but no natural hybrids are known between Prosopium and other coregonines. Within Prosopium, P. coulteri was the most divergent species branching out at D =0·51 from the others and followed by P. cylindraceum at D =0·28. The three remaining species are closely related. Among them P. williamsoni joins P. gemmifer and P. spilonotus at 0·04, and the distance between the two Bear Lake endemics is only 0·004. The distance between P. cylindraceum and the remaining Prosopium species is similar to distances between Stenodus and Coregonus . The small genetic distance between P. spilonotus and P. gemmifer suggests their recent divergence. Even though no fixed differences were found between them, diVerent alleles were present at two loci at large enough frequencies to indicate reproductive isolation. This confirms that P. gemmifer and P. spilonotus are good biological species as indicated by their distinct morphology and ecology.