Genetic variation in marine teleosts: High variability in habitat specialists and low variability in habitat generalists

Smith, Peter; Fujio, Yoshihisa

doi:10.1007/bf00396955

Cited by 135 publications

(73 citation statements)

References 28 publications

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“…Although showing a reduced discriminating power when compared to the morphometric traits, meristic counts of the number of rays on the pectoral and caudal fins and the number of sublabial barbells were also important factors in sample differentiation. Allozymes revealed that the genetic variability of H. didactylus along the Portuguese coast was similar to that determined by Smith and Fujio (1982) over a large number of marine teleosts (mean heterozygosities of 0.006). The mean F ST value found in the analysis of all loci (0.042) was lower than that reported by Ward et al (1994) for fishes (0.14) but was in accordance with the low spatial genetic heterogeneity suggested by Gyllensten (1985) for marine teleosts.…”

Section: Discussionsupporting

confidence: 52%

Genetic and morphologic differentiation of the Lusitanian toadfish (Halobatrachus didactylus) between estuarine and coastal areas in Portugal

Marques¹,

Rego²,

Costa³

et al. 2006

Sci. Mar.

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SUMMARY: The Lusitanian toadfish, Halobatrachus didactylus (Bloch and Schneider, 1801), is distributed from the Ghana coast to the Iberian Peninsula, being particularly abundant on the south coast of Portugal. The differentiation of this species along the Portuguese coast was assessed through the analysis of 10 samples, considering morphological characters (20 morphometric and 16 meristic) and genetic markers (10 allozymes, 11 loci). Southern samples included estuaries and their adjacent coastal areas, given that this species inhabits both environments, whereas western samples only comprised estuaries. Morphometric and meristic data discriminant analysis evidenced some differentiation between estuarine and coastal populations. This was not entirely corroborated by the genetic analysis, which showed an overall pattern of low F ST (0.042) and Nei's genetic distance, even between geographically distant areas. However, higher values of these parameters were found between estuaries of the south coast and their adjacent coastal areas, suggesting that estuarine systems play a major role in such differentiation. Results are discussed regarding toadfish life-history pattern and Portuguese coast geomorphology, giving an insight into the biological and environmental factors influencing population sub-structuring.Keywords: Halobatrachus didactylus differentiation, allozymes, morphology, population structure, coastal areas RESUMEN: DIFERENCIACIÓN MORFOLÓGICA Y GENÉTICA DEL PEJESAPO (HALOBATRACHUS DIDACTYLUS) ENTRE ESTUARIOS Y ÁREAS COSTERAS DE PORTUGAL. -El pejesapo, Halobatrachus didactylus (Bloch y Schneider, 1801), está distribuido desde la costa de Ghana hasta la Península Ibérica, siendo particularmente abundante en la costa sur portuguesa. La diferenciación de esta especie a lo largo de la costa Portuguesa se ha evaluado a través del análisis de diez muestras, considerando caracteres morfológicos (20 características morfométricas y 16 merísticas) y genéticos (10 aloenzimas, 11 loci). Hacia el sur, las muestras incluyen estuarios y sus áreas costeras adyacentes, ya que esta especie habita ambos ambientes, mientras que las muestras del oeste están relacionadas sólo a estuarios. El análisis discriminante de los datos morfométricos y merísticos evidenciaron diferenciación entre poblaciones de estuarios y costeras, lo cual no fue enteramente corroborado por el análisis genético, el cual mostró un patrón general de bajo F ST (0.042) y distancia genética de Nei, incluyendo áreas geográficamente distantes. Sin embargo, valores más altos de estos parámetros fueron encontrados entre estuarios de la costa sur y sus áreas costeras adyacentes, sugiriendo que los sistemas de estuarios juegan un papel importante en tal diferenciación. Los resultados son discutidos considerando los patrones de historia de vida del pejesapo y la geomorfología de la costa portuguesa, dando una perspectiva de cómo los procesos biológicos y factores ambientales influyen la sub-estructuración poblacional.Palabras clave: Halobatrachus didactylus diferenciac...

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Section: Discussionsupporting

confidence: 52%

Genetic and morphologic differentiation of the Lusitanian toadfish (Halobatrachus didactylus) between estuarine and coastal areas in Portugal

Marques¹,

Rego²,

Costa³

et al. 2006

Sci. Mar.

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“…A general pattern of low genetic divergence among populations of marine fish species has been pointed out by several authors (e.g. Smith and Fujio, 1982;Gyllensten, 1985), who report that the level of differentiation (F ST ) expected for high mobile species usually ranges from 0 to 0.028 (Waples, 1987). Nevertheless, for some marine species with high dispersal capabilities, several studies have pointed out the existence of population differentiation.…”

Section: Discussionmentioning

confidence: 91%

Genetic differentiation of Solea solea (Linnaeus, 1758) and Solea senegalensis Kaup, 1858, (Pisces: Pleuronectiformes) from several estuarine systems of the Portuguese coast

Cabral¹,

Castro²,

Linhares³

et al. 2003

Sci. Mar.

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SUMMARY:The genetic differentiation of Solea solea and Solea senegalensis from several estuarine systems along the Portuguese coast was studied. Nine polymorphic isozyme loci (ACP-1*, ACP-2*, GPI-1*, GPI-2*, sMDH*, ME-1*, ME-2*, MPI* and PGM*) were analysed using starch gel electrophoresis and isoelectric focusing. Differentiation between the species was high (mean average Nei distance of 0.93). The most efficient loci in the diagnosis of the two species were ACP-1*, ME-2* and GPI-2*. S. solea showed a higher genetic diversity than S. senegalensis. Within each species a low genetic differentiation between the samples analysed was found. Although with a low magnitude the interpopulational genetic differentiation of S. solea was higher than that of S. senegalensis. This could probably be explained by some particularities of the life cycles of these species, namely the more extended period of occurrence of larval stages of S. senegalensis in the plankton. Although no clear evidence about the population structure model emerged from the analysis of several Atlantic and Mediterranean populations of S. solea, the significant correlations obtained between genetic and geographical distances support an isolation by distance model.

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“…Another four loci were scored for all populations except that of Pernambuco (Table 3). Observed heterozygosities (average Hardy-Weinberg expected heterozygosity, He = 0.1917; Table 3) were high (Smith and Fujio, 1982;Ward et al, 1994). Overall, the populations were found to be genetically structured (F ST = 0.0277; 95% confidence interval (bootstrapping over loci) = 0.00078-0.05648; standard error (jacknifing across loci) = 0.0195 reject the null hypothesis of population homogeneity).…”

Section: Allozyme Electrophoresismentioning

confidence: 90%

Genetic and morphometric differences between yellowtail snapper (Ocyurus chrysurus, Lutjanidae) populations of the tropical West Atlantic

Vasconcellos

Vianna²,

Paiva

et al. 2008

Genet. Mol. Biol.

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Populations of Ocyurus chrysurus were compared genetically and morphometrically along the West Atlantic coast to test the null hypothesis of population homogeneity in the area. Brazilian populations were found to be differentiated in shape (canonical variates analysis; F [48,515] = 10.84, p < 0.0001). Analyses of mitochondrial DNA sequences (663 bp of the control region) did not show any differences between Brazilian populations but could detect differences between Brazilian and Caribbean (Belize) populations. The samples from Pernambuco differed significantly from the other Brazilian populations in allozyme frequencies (11 loci; F ST = 0.167; p < 0.05), but this may have resulted from the small number of samples analysed for that population. Sequence variation of Belize samples departed from neutral expectations (Fu's FS = -8.88; p < 0.001). A mismatch distribution analysis points to an ancient population expansion in that area. We conclude that the genetic data do not allow the rejection of the null hypothesis of panmixia for Brazilian yellowtail snapper populations which should be treated as a single genetic stock, with a latitudinal gradient on their morphology which probably results from phenotypic plasticity. On the other hand, there is a severe restriction to gene flow between O. chrysurus populations from the Caribbean and from the southwestern Atlantic.

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Genetic variation in marine teleosts: High variability in habitat specialists and low variability in habitat generalists

Cited by 135 publications

References 28 publications

Genetic and morphologic differentiation of the Lusitanian toadfish (<i>Halobatrachus didactylus</i>) between estuarine and coastal areas in Portugal

Genetic and morphologic differentiation of the Lusitanian toadfish (<i>Halobatrachus didactylus</i>) between estuarine and coastal areas in Portugal

Genetic differentiation of <i>Solea solea</i> (Linnaeus, 1758) and <i>Solea senegalensis</i> Kaup, 1858, (Pisces: Pleuronectiformes) from several estuarine systems of the Portuguese coast

Genetic and morphometric differences between yellowtail snapper (Ocyurus chrysurus, Lutjanidae) populations of the tropical West Atlantic

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