Molecular phylogenetic perspective on speciation in the genus Sebastes (Scorpaenidae) from the Northwest Pacific and the position of Sebastes within the subfamily Sebastinae

Kai, Yoshiaki; Nakayama, Kouji; Nakabo, Tetsuji

doi:10.1007/s10228-003-0163-9

Cited by 46 publications

(34 citation statements)

References 9 publications

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“…For example, S. melanops and S. serranoides share depth preference and have identical rhodopsin genotypes, even sharing synonymous substitutions. Yet, S. melanops groups with S. flavidus , and not S. serranoides on the cytochrome b tree, a relationship strongly supported in this and other analyses (Johns & Avise, 1998; Rocha‐Olivares et al , 1999a; Kai et al , 2003; Hyde & Vetter, 2007). This phylogenetic discrepancy could arise as a result of parallel substitutions at rhodopsin in S. melanops and S. serranoides as adaptations to shallow environments.…”

Section: Discussionsupporting

confidence: 76%

Parallel amino acid replacements in the rhodopsins of the rockfishes (Sebastes spp.) associated with shifts in habitat depth

Sivasundar

Palumbi

2010

J of Evolutionary Biology

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Among various groups of fishes, a shift in peak wavelength sensitivity has been correlated with changes in their photic environments. The genus Sebastes is a radiation of marine fish species that inhabit a wide range of depths from intertidal to over 600 m. We examined 32 species of Sebastes for evidence of adaptive amino acid substitution at the rhodopsin gene. Fourteen amino acid positions were variable among these species. Maximum likelihood analyses identify several of these to be targets of positive selection. None of these correspond to previously identified critical amino acid sites, yet they may in fact be functionally important. The occurrence of independent parallel changes at certain amino acid positions reinforces this idea. Reconstruction of habitat depths of ancestral nodes in the phylogeny suggests that shallow habitats have been colonized independently in different lineages. The evolution of rhodopsin appears to be associated with changes in depth, with accelerated evolution in lineages that have had large changes in depth.

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Section: Discussionsupporting

confidence: 76%

Parallel amino acid replacements in the rhodopsins of the rockfishes (Sebastes spp.) associated with shifts in habitat depth

Sivasundar

Palumbi

2010

J of Evolutionary Biology

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“…The rockfish genus Sebastes, the most speciose genus in the family Scorpaenidae, encompassing over 110 species (Nelson 2006) characterized by great morphological variability, has been the subject of a number of recent studies of their evolutionary relationships (e.g., Rocha-Olivares et al 1999a;Kai et al 2003;Hyde and Vetter 2007). Although the large assemblage of species in Sebastes was thought to have resulted from an ancient explosive speciation event (Johns and Avise 1998), many species complexes that exhibit few or almost no morphological differences were shown to have speciated more recently upon the application of molecular markers, including variations in mitochondrial DNA (mtDNA), allozymes, microsatellites or AFLPs (Roques et al 1999;RochaOlivares et al 1999b;Kai et al 2002a, b;Narum et al 2004;Hawkins et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Genetic and morphological divergence within the Sebastes pachycephalus complex (Scorpaeniformes: Scorpaenidae)

2011

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Genetic and morphological divergence among the four subspecies in the Sebastes pachycephalus complex (S. pachycephalus pachycephalus, S. p. nigricans, S. p. nudus and S. p. chalcogrammus) was clarified. Principal coordinate analysis (PCoA) based on AFLP clearly divided 55 specimens of the complex into two groups, the S. p. pachycephalus-S. p. nigricans group (P-Ni group) and the S. p. nudus-S. p. chalcogrammus group (Nu-C group), although three specimens occupied intermediate positions.The minimum spanning network (MSN) based on partial sequences of the mitochondrial control region (mtCR) failed to separate either the P-Ni and Nu-C groups or the four subspecies into distinct clades, although restricted gene flow and genetic differentiation between the former were indicated by the F ST estimation. Differences in morphological characters, including counts of pectoral fin rays and counts of dorsal fin spines lacking basal scales, were also evident between the two groups. However, little or no genetic or morphological difference was found between the two subspecies within each group. It was concluded that the P-Ni and Nu-C groups of the S. pachycephalus complex actually represent two different species, which is further supported by their sympatric distribution. Differences in dorsal body coloration and the presence or absence of brown spots on the ventral surface, which were formerly used to discriminate between four ''subspecies,'' may simply represent intraspecific variation. The three specimens occupying intermediate positions in the AFLP PCoA also occupied equivocal positions between the two species in the principal component analysis (PCA) based on morphometric characters, suggesting that they were hybrids between the two species. The star-shaped MSN of mtCR, which lacks distinct clades representing the two species, may be due to not only interspecific hybridization but also the sharing of ancestral haplotypes.

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“…Several previously recognized groupings within rockfish (variably designated genera or subgenera), identified on the basis of external morphology, contained species from both the NEP and the NWP (Matsubara 1943;Chen 1985;Kendall Jr. 2000), implying frequent dispersal between regions. However, later molecular studies clearly demonstrated that most of these groups were polyphyletic, consisting of NEP and NWP species that were distantly related despite their phenotypic resemblance (Kai et al 2003;Hyde and Vetter 2007), and that dispersal between regions was relatively rare. Each region is home to substantial clades that have diversified in situ, and the NEP in particular contains multiple lineages that have independently arrived at similar ecological strategies (such as benthic vs. open-water habitat use; Love et al 2002).…”

Section: Introductionmentioning

confidence: 99%

The Geography of Morphological Convergence in the Radiations of PacificSebastesRockfishes

Ingram

Kai²

2014

The American Naturalist

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The evolution of convergent phenotypes in lineages subject to similar selective pressures is a common feature of adaptive radiation. In geographically replicated radiations, repeated convergence occurs between clades occupying distinct regions or islands. Alternatively, a clade may repeatedly reach the same adaptive peaks in broadscale sympatry, resulting in extensive convergence within a region. Rockfish (Sebastes sp.) have radiated in both the northeast and northwest Pacific, allowing tests of the extent and geographic pattern of convergence in a marine environment. We used a suite of phylogenetically informed methods to test for morphological convergence in rockfish. We examined patterns of faunal similarity using nearest neighbor distances in morphospace and the frequency of morphologically similar yet distantly related species pairs. The extent of convergence both between regions and within the northeast Pacific exceeds the expectation under a Brownian motion null model, although constraints on trait space could account for the similarity. We then used a recently developed method (SURFACE) to identify adaptive peak shifts in Sebastes evolutionary history. We found that the majority of convergent peak shifts occur within the northeast Pacific rather than between regions and that the signal of peak shifts is strongest for traits related to trophic morphology. Pacific rockfish thus demonstrate a tendency toward morphological convergence within one of the two broad geographic regions in which they have diversified.

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Molecular phylogenetic perspective on speciation in the genus Sebastes (Scorpaenidae) from the Northwest Pacific and the position of Sebastes within the subfamily Sebastinae

Cited by 46 publications

References 9 publications

Parallel amino acid replacements in the rhodopsins of the rockfishes (Sebastes spp.) associated with shifts in habitat depth

Parallel amino acid replacements in the rhodopsins of the rockfishes (Sebastes spp.) associated with shifts in habitat depth

Genetic and morphological divergence within the Sebastes pachycephalus complex (Scorpaeniformes: Scorpaenidae)

The Geography of Morphological Convergence in the Radiations of PacificSebastesRockfishes

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