Evolution of a Mitochondrial CytochromebGene Sequence in the Species-Rich GenusSebastes(Teleostei, Scorpaenidae) and Its Utility in Testing the Monophyly of the SubgenusSebastomus

Rocha‐Olivares, Axayácatl; Kimbrell, Carol A.; Eitner, Blaise J.; Vetter, Russell D.

doi:10.1006/mpev.1998.0584

Cited by 61 publications

(69 citation statements)

References 35 publications

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“…This remarkable level of crossspecies microsatellite conservation is a clear indication of the close molecular relatedness of species of Sebastes that has surfaced in other microsatellite studies (e.g. Miller et al, 2000;Roques et al, 1999;Wimberger et al, 1999) as well as other molecular investigations (Rocha-Olivares et al, 1999a;RochaOlivares et al, 2000;Rocha-Olivares et al, 1999b;Rocha-Olivares et al, 1999c). Most loci analysed were polymorphic, except for one.…”

Section: Genetic Diversitysupporting

confidence: 52%

Microsatellite variation in the Mexican rockfish <i>Sebastes macdonaldi</i>

Rocha‐Olivares¹,

Leal-Navarro²,

Kimbrell³

et al. 2003

Sci. Mar.

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SUMMARY: The Mexican rockfish Sebastes macdonaldi is the Northeast Pacific rockfish with the southernmost distribution, featuring isolated populations in the Gulf of California. We analysed seven microsatellite loci in 111 organisms collected throughout most of its geographical range to test long-standing hypotheses regarding its disjunct distribution. One locus was fixed and the number of alleles in polymorphic loci ranged from 2 to 24 (average 13.5). We found very high levels of polymorphism (overall He = 0.75) comparable to other congeneric species but no significant differences in genetic diversity among localities or between Pacific and Gulf of California populations (p > 0.1). Significant shifts in allelic and genotypic frequencies were detected at three loci, which resulted in a small but significant partitioning of genetic variance among California, Baja California and Gulf of California populations (F ST = 0.007, p = 0.03) and between Gulf and Pacific populations (F ST = 0.01, p = 0.004). The latter but not the former result was corroborated by analyses of molecular variance (AMOVA) using the number of distinct alleles (F ST ) and the sum of square differences of allele sizes (R ST ) as Euclidean distances. The evidence argues against contemporary gene flow between the gulf and the Pacific ocean and against an ancient invasion of the gulf with a founder effect. The small level of divergence favours a recent dispersal but a larger data set including DNA sequences amenable to phylogenetic analyses will help to test alternative hypotheses of dispersal versus vicariance.Key words: Mexican rockfish, disjunct distribution, microsatellites, genetic structure, Baja California, México. RESUMEN: VARIACIÓN DE MICROSATÉLITES EN EL ROCKOT MEXICANO SEBASTES MACDONALDI. -El rockot mexicanoSebastes macdonaldi es la especie de Sebastes del Pacífico nororiental con la distribución geográfica más sureña e incluye poblaciones aisladas dentro del Golfo de California. Analizamos siete loci microsatelitales en 111 organismos que se colectaron a lo largo de gran parte de su distribución geográfica para probar hipótesis acerca de su distribución discontinua. Un locus se encontró fijado y el número de alelos en loci polimórficos varió entre 2 y 24 (media 13.5). Encontramos altos niveles de polimorfismo (en general He = 0.75) comparables con otras especies congenéricas, sin embargo no se encontraron diferencias en los niveles de diversidad entre las localidades ni entre las poblaciones del Pacífico y del Golfo de California (p > 0.1). Se detectaron cambios significativos en las frecuencias alélicas y genotípicas en tres loci, que resultaron en una división pequeña pero significativa de la variancia genética entre California, Baja California y el Golfo de California (F ST = 0.007, p = 0.03) y entre las poblaciones del golfo y del Pacífico (F ST = 0.01, p = 0.004). Solamente esta última diferenciación fue corroborada por un análisis de variancia molecular (AMOVA) en el que se utilizaron el número de alelos distintos (F ST ) y la su...

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Section: Genetic Diversitysupporting

confidence: 52%

Microsatellite variation in the Mexican rockfish <i>Sebastes macdonaldi</i>

Rocha‐Olivares¹,

Leal-Navarro²,

Kimbrell³

et al. 2003

Sci. Mar.

Self Cite

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“…Notochord flexion begins soon after larvae reach 6.2 mm and is completed by about 7.7 mm. Transformation to the pelagic juvenile stage begins near 20 mm and is complete by about 27 mm (Rocha-Olivares et al, 2000).…”

Section: Descriptionmentioning

confidence: 99%

“…A dorsal saddle may form on the trunk as well, late during the postflexion stage or during transformation to the pelagic juvenile stage (e.g., Rocha-Olivares et al, 1999). On the basis of these characters, larval Sebastomus can be distinguished from larvae of most, but not all, Sebastes species described to date.…”

Section: Comparisonsmentioning

confidence: 99%

“…Differences among larvae of Sebastomus species are quite small (e.g., Moser, 1996b;Rocha-Olivares, 1998;RochaOlivares et al, 2000), and currently larvae of none of these species can be reliably identified with traditional morphological and pigment characters. Complete larval development for any Sebastomus species is still unknown; to date, extrusion larvae are known for 7 of the 15 species, and some later stages are known for 4 species, including the cape redfish (S. capensis) of the Southern Hemisphere (e.g., Westrheim et al 1 ;Moser, 1967;Moser et al, 1977;Richardson and Laroche, 1979;Moser and Butler, 1987;Matarese et al, 1989;Sabatés and Olivar, 1990;Moser, 1996b;Rocha-Olivares et al, 2000). Larvae of another species, probably buccaneer rockfish (S. exsul) or spinyeye rockfish (S. spinorbis), have been described through the postflexion stage (Moser et al, 1977).…”

mentioning

confidence: 99%

“…Larvae of another species, probably buccaneer rockfish (S. exsul) or spinyeye rockfish (S. spinorbis), have been described through the postflexion stage (Moser et al, 1977). Early development of S. ensifer is known only from newly extruded larvae (Moser, 1967) and from large, transforming larvae (≥19.8 mm standard length) and pelagic juveniles (Rocha-Olivares et al, 2000). The purpose of this article is to describe external morphology and pigmentation of larval S. ensifer from the early preflexion stage through the early postflexion stage, nearly the full developmental range not previously described in the literature and a range that encompasses most of the rockfish larvae routinely collected in standard plankton tows (e.g., Moser, 1996b).…”

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confidence: 99%

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