Phylogeny of Pacific salmon and trout based on growth hormone type-2 and mitochondrial NADH dehydrogenase subunit 3 DNA sequences

The phylogeny of Oncorhynchus has previously been studied using a variety of morphological and genetic characters, but two unresolved problems remain: the position of masu (O. masou) and amago (O. rhodurus) salmon and the relationships within the group containing sockeye (O. nerka), pink (O. gorbusc...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 1996-05, Vol.53 (5), p.1165-1176
Main Authors: McKay, S J, Devlin, R H, Smith, M J
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Marine
Oncorhynchus
Oncorhynchus clarki
Oncorhynchus gorbuscha
Oncorhynchus keta
Oncorhynchus masou
Oncorhynchus mykiss
Oncorhynchus nerka
Oncorhynchus rhodurus
Salmo salar
Salvelinus namaycush
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
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Summary:The phylogeny of Oncorhynchus has previously been studied using a variety of morphological and genetic characters, but two unresolved problems remain: the position of masu (O. masou) and amago (O. rhodurus) salmon and the relationships within the group containing sockeye (O. nerka), pink (O. gorbuscha), and chum (O. keta) salmon. The relationships were examined among nine Oncorhynchus species, Atlantic salmon (Salmo salar), and lake trout (Salvelinus namaycush) using DNA sequence analyses of the mitochondrial NADH dehydrogenase subunit 3 gene and a portion of the nuclear growth hormone type-2 gene. Phylogenetic trees inferred using both cladistic and distance approaches were highly concordant except in the placement of the outgroup; strong support is provided for the proposition that pink and chum salmon are sister species, and that masu and amago salmon are closer to the Pacific trout than the other Pacific salmon. The phylogeny inferred by total evidence cladistic analysis of the data combined with five different morphological, biochemical, and DNA character sets provides evidence that the common ancestor of rainbow (O. mykiss) and cutthroat (O. clarki) trout was the first to diverge from the proto-Oncorhynchus evolutionary line, which then radiated to form the seven extant Pacific salmon species.
ISSN:0706-652X
1205-7533
DOI:10.1139/f96-042