Genetic Divergence between Gopher Rockfish (Sebastes carnatus) and Black and Yellow Rockfish (Sebastes chrysomelas)

Narum, Shawn R.; Buonaccorsi, Vincent P.; Kimbrell, Carol A.; Vetter, Russell D.

doi:10.1643/cg-02-061r2

Cited by 32 publications

(46 citation statements)

References 15 publications

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“…In fact, body coloration and marking patterns have often been shown to be useful for species discrimination within Sebastes (Kai et al 2002a;Narum et al 2004;Hawkins et al 2005;Orr and Hawkins 2008). Although no significant genetic differences were found between the ''subspecies'' of the species (P-Ni and Nu-C) recognized here, further studies based on additional markers from more specimens may reveal genetic differences within each pair of ''subspecies.…”

Section: Discussionmentioning

confidence: 99%

“…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). Such species complexes may be evidence for active speciation mechanisms within the genus (Alesandrini and Bernardi 1999;Hyde and Vetter 2007), and may provide useful examples for the study of speciation in marine fishes.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2011

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“…, 2001). Collectively these findings of recent and cryptic speciation, combined with the suggestion of ecological speciation between congeners (Larson, 1980; Alesandrini & Bernardi, 1999; Narum et al. , 2004), provide substantial evidence of contemporary speciation within the genus.…”

Section: Introductionmentioning

confidence: 87%

Demographic history, geographical distribution and reproductive isolation of distinct lineages of blue rockfish (Sebastes mystinus), a marine fish with a high dispersal potential

Burford

2009

J of Evolutionary Biology

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Understanding the barriers to genetic exchange in taxonomic groups that have a high dispersal potential will provide critical information on speciation in general. Blue rockfish (Sebastes mystinus) are good taxa to examine speciation because they are nonmigratory inhabitants of shallow rocky reef habitats along the eastern North Pacific with a pelagic larval stage lasting 3–5 months. The goal of this study was to analyse the evolutionary history and distribution patterns of different lineages within S. mystinus described previously and use this information to understand the speciation process in this group of high dispersal fish. The molecular data derived from specimens sampled over approximately 1650 km of the S. mystinus range revealed a northerly and southerly distribution for the two lineages. Almost equal frequencies of both lineages occurred at centrally located sample locations, with evidence of reproductive isolation between the lineages. A demographic analysis showed that the two lineages diverged and experienced sudden expansion prior to the last glacial maximum, which affected the observed pattern of genetic structure. The spatial distribution, demographic history and degree of genetic distinctiveness found from the genetic analysis, despite the high potential for dispersal in S. mystinus, suggest both lineages diverged in allopatry.

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“…A greater level of divergence was found between the two types of blue rockfish than has been reported between the sister species gopher rockfish (S. carnatus) and black and yellow rockfish (S. chrysomelas) (Narum et al 2004). Examples of both types of blue rockfish were found within kilometers of each other, suggesting their ability to maintain genetic isolation persists in the absence of physical isolation.…”

Section: Species Identificationmentioning

confidence: 63%

“…In at least a few cases, color is indicative of distinct species and genetic methods have confirmed some of those relationships. Narum et al (2004) used microsatellites to explore speciation in the sympatric species pair gopher rockfish (S. carnatus) and black and yellow rockfish (S. chrysomelas). They found clear evidence for genetic differentiation between the two groups, with strong concordance to color morph (98%).…”

Section: Species Identificationmentioning

confidence: 99%

The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

Berntson

Moran

2008

Rev Fish Biol Fisheries

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Rockfishes (Sebastes spp.) represent a speciose and ecologically important group of marine fishes found in both the Pacific and Atlantic oceans, with approximately 105 species found world-wide (Hyde and Vetter 2007). They also comprise the majority of species found in the Pacific groundfish fishery. Thorough species assessments in terms of harvest management have been done for only 11 species, and of the 11 species, seven have been declared overfished. Having accurate genetic information is critical to the continuing effort at stock assessments, but sampling is often difficult in marine fishes. Genetic techniques are a powerful tool in the effort to better characterize the ecology of these species. These techniques can be used to investigate multiple biological traits, including species identity, intra-and interspecific genetic variation, migration patterns, and effective population size. There are important caveats and limitations when applying specific genetic methods, especially in marine species that lack discrete spawning aggregates. Nevertheless, it is clear from a review of recent literature that genetic tools have already provided very specific insight regarding rockfish population dynamics. The results are diverse and difficult to synthesize; however, existing studies show five primary patterns to population groupings in rockfishes: no obvious pattern of structure, structure consistent with isolation by distance, structure evident but inconsistent with isolation by distance, structure that correlates to oceanographic features, and potential genetic introgression. Clearly the study of rockfish population genetics is poised for rapid expansion that will unquestionably aid management of the rockfish fisheries and general understanding of rockfish evolutionary systematics. A principle challenge at this point is to derive generalized inferences from such a diverse array of study results across the vast North Pacific range of Sebastes. This review summarizes existing genetic studies in Sebastes spp. in the North Pacific to assist in identifying knowledge gaps for this ecologically important and diverse group.

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Genetic Divergence between Gopher Rockfish (Sebastes carnatus) and Black and Yellow Rockfish (Sebastes chrysomelas)

Cited by 32 publications

References 15 publications

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

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

Demographic history, geographical distribution and reproductive isolation of distinct lineages of blue rockfish (Sebastes mystinus), a marine fish with a high dispersal potential

The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

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