Phylogenetic relationship of the genus Oncorhynchus species inferred fromnuclear and mitochondrial markers.

Abstract

The phylogenetic relationship among the salmonid fishes of the genus Oncorhynchus has been analyzed using various kinds of markers for a long time. However, there are three major disagreements among those studies; (1) the authenticity of the Pacific salmon group as a monophyletic cluster, (2) the phylogenetic relationship among three Pacific salmons (pink salmon, sockeye salmon, and chum salmon), and (3) the phylogenetic position of masu salmon. We used allozyme electrophoresis to clarify the phylogenetic relationship between the Pacific salmon group and the Pacific trout group. Furthermore, we reanalysed published mitochondrial DNA D-loop sequences (Shedlock et al., 1992). Allozymic data and mtDNA data indicated the following consistent results; (1) all Pacific salmons formed a monophyletic cluster, (2) chum salmon and pink salmon were clustered within those Pacific salmons, (3) masu salmon formed a cluster with other Pacific salmons and diverged first in this group.

Mitochondrial cytochrome b sequence variation in Korean salmonids

“…Trees obtained from sequence data for other mitochondrial regions show the same relationships (data not shown). This finding is supported by many previous works: morphology (Stearley & Smith, 1993), mtDNA sequences (Thomas & Beckenbach, 1989;Kitano et al, 1997;Shedlock et al, 1992), mtDNA restriction fragment length polymorphisms (RFLPs) (Thomas et al, 1986), nuclear and mitochondrial DNA sequence data (Domanico et al, 1997), and short interspersed repetitive elements (SINES) (Murata et al, 1993). As here, most phylogenetic studies have found that cherry salmon forms a cluster with other Pacific salmons.…”

“…Allozyme electrophoresis (Kitano et al, 1997), ribosomal DNA (rDNA) RFLP (Phillips et al, 1992) data, and the nucleotide sequence data of the D intron of growth hormone 2 (GH2D) (Mackay et al, 1996) suggest that cherry salmon is closer to the Pacific trout than the other Pacific salmons. T V. The phylogenetic relationships among six salmonid species.…”

“…Cherry salmon is found only in Asia and first diverged from the common ancestor of the genus Oncorhynchus (Tsuyuki & Roberts, 1966;McKay et al, 1996;Kitano et al, 1997), but there remains an unresolved problem of the phylogenetic position of this taxon. To clarify the problem on the phylogenetic relationship of Oncorhynchus species, further work seems to be needed in various aspects.…”

Latitudinal cline in allele length provides evidence for selection in a circadian rhythm gene

“…However, in these two species, the direction of the correlation was variable. Our results with kokanee are similar in magnitude and direction to the cline previously observed in chum salmon (O'Malley et al ., ); we hypothesize that this similarity may have a phylogenetic basis, given that kokanee have a closer evolutionary relationship to chum than to Chinook salmon (Murata et al ., ; Kitano, Matsuoka & Saitou, ). Quantification of OtsClock1b length variation in anadromous sockeye salmon would provide additional insights into the historical context of these observed patterns.…”

Phylogeny of Salmonine Fishes Based on Growth Hormone Introns: Atlantic (Salmo) and Pacific (Oncorhynchus) Salmon Are Not Sister Taxa

“…Despite an unusually large number of phylogenetic studies conducted on some groups of salmonidsespecially Oncorhynchus (Domanico et al, 1997;Kitano et al, 1997;Oohara et al, 1997;reviewed in Phillips and Oakley, 1997)-other important groups are understudied. The result has been a paucity of information about deeper divergence within Salmonidae.…”