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Invasive cyprinid fish in Europe originate from the single introduction of an admixed source population followed by a complex pattern of spread.

Simon A, Britton R, Gozlan R, van Oosterhout C, Volckaert FA, Hänfling B - PLoS ONE (2011)

Bottom Line: A highly invasive freshwater fish, it is currently found in at least 32 countries outside its native range.Based on coalescent theory, all introduced and some native populations showed a relative excess of nucleotide diversity compared to haplotype diversity.Furthermore, it was preceded by, or associated with, the admixture of genetically diverse source populations that may have augmented its invasive-potential.

View Article: PubMed Central - PubMed

Affiliation: Evolutionary Biology Group, Department of Biological Sciences, University of Hull, Hull, United Kingdom. a.simon@2007.hull.ac.uk

ABSTRACT
The Asian cyprinid fish, the topmouth gudgeon (Pseudorasbora parva), was introduced into Europe in the 1960s. A highly invasive freshwater fish, it is currently found in at least 32 countries outside its native range. Here we analyse a 700 base pair fragment of the mitochondrial cytochrome b gene to examine different models of colonisation and spread within the invasive range, and to investigate the factors that may have contributed to their invasion success. Haplotype and nucleotide diversity of the introduced populations from continental Europe was higher than that of the native populations, although two recently introduced populations from the British Isles showed low levels of variability. Based on coalescent theory, all introduced and some native populations showed a relative excess of nucleotide diversity compared to haplotype diversity. This suggests that these populations are not in mutation-drift equilibrium, but rather that the relative inflated level of nucleotide diversity is consistent with recent admixture. This study elucidates the colonisation patterns of P. parva in Europe and provides an evolutionary framework of their invasion. It supports the hypothesis that their European colonisation was initiated by their introduction to a single location or small geographic area with subsequent complex pattern of spread including both long distance and stepping-stone dispersal. Furthermore, it was preceded by, or associated with, the admixture of genetically diverse source populations that may have augmented its invasive-potential.

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Plot of nucleotide (π) diversity versus haplotype (H) of the introduced (open circles) and native populations (solid circles).Also shown is the expected relationship between nucleotide diversity (±5–95% CI) and haplotype diversity of simulated populations (crosses) under mutation-drift equilibrium for populations. Excluded is the Polish population PU because its high value nucleotide diversity.
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pone-0018560-g005: Plot of nucleotide (π) diversity versus haplotype (H) of the introduced (open circles) and native populations (solid circles).Also shown is the expected relationship between nucleotide diversity (±5–95% CI) and haplotype diversity of simulated populations (crosses) under mutation-drift equilibrium for populations. Excluded is the Polish population PU because its high value nucleotide diversity.

Mentions: After bootstrapping to account for differences in sample size, the genetic diversity of the native populations varied widely among geographical regions. Whereas the two populations of the Hai He drainage showed relatively high diversity (H = 0.34, 0.76; π = 0.006, 0.010), the populations from other drainages of mainland China and Taiwan where much less variable (H = 0.00–0.46; π = 0.000–0.002). (Table 2, Figure 5). Genetic variation in introduced populations also varied considerably. The two recently established British populations showed low levels of variability (H = 0.00, 0.20; π = 0.000, 0.001) whereas the populations from continental Europe showed relatively high levels of variation (H = 0.20–0.66); π = 0.003–0.026). The highest nucleotide diversity was found in the Polish (PU) population (π = 0.026); this population contained one extremely divergent haplotype that clustered with a G. gobio haplotype, suggesting hybridisation and so was excluded from further comparisons. Overall genetic diversity in native populations (mean±SD; Hs = 0.27±0.29; π = 0.003±0.004) and invasive populations (mean±SD; Hs = 0.43±0.19; π = 0.008±0.006) was not significantly different (H, P = 0.108; π, P = 0.068). However, a more detailed analysis revealed that there were significant differences among certain groups of native and invasive populations. When the recently introduced UK populations were excluded from the analysis, both haplotype diversity and nucleotide diversity and were significantly higher in the invasive populations than native (P = 0.043 and, P = 0.014, respectively).


Invasive cyprinid fish in Europe originate from the single introduction of an admixed source population followed by a complex pattern of spread.

Simon A, Britton R, Gozlan R, van Oosterhout C, Volckaert FA, Hänfling B - PLoS ONE (2011)

Plot of nucleotide (π) diversity versus haplotype (H) of the introduced (open circles) and native populations (solid circles).Also shown is the expected relationship between nucleotide diversity (±5–95% CI) and haplotype diversity of simulated populations (crosses) under mutation-drift equilibrium for populations. Excluded is the Polish population PU because its high value nucleotide diversity.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3108587&req=5

pone-0018560-g005: Plot of nucleotide (π) diversity versus haplotype (H) of the introduced (open circles) and native populations (solid circles).Also shown is the expected relationship between nucleotide diversity (±5–95% CI) and haplotype diversity of simulated populations (crosses) under mutation-drift equilibrium for populations. Excluded is the Polish population PU because its high value nucleotide diversity.
Mentions: After bootstrapping to account for differences in sample size, the genetic diversity of the native populations varied widely among geographical regions. Whereas the two populations of the Hai He drainage showed relatively high diversity (H = 0.34, 0.76; π = 0.006, 0.010), the populations from other drainages of mainland China and Taiwan where much less variable (H = 0.00–0.46; π = 0.000–0.002). (Table 2, Figure 5). Genetic variation in introduced populations also varied considerably. The two recently established British populations showed low levels of variability (H = 0.00, 0.20; π = 0.000, 0.001) whereas the populations from continental Europe showed relatively high levels of variation (H = 0.20–0.66); π = 0.003–0.026). The highest nucleotide diversity was found in the Polish (PU) population (π = 0.026); this population contained one extremely divergent haplotype that clustered with a G. gobio haplotype, suggesting hybridisation and so was excluded from further comparisons. Overall genetic diversity in native populations (mean±SD; Hs = 0.27±0.29; π = 0.003±0.004) and invasive populations (mean±SD; Hs = 0.43±0.19; π = 0.008±0.006) was not significantly different (H, P = 0.108; π, P = 0.068). However, a more detailed analysis revealed that there were significant differences among certain groups of native and invasive populations. When the recently introduced UK populations were excluded from the analysis, both haplotype diversity and nucleotide diversity and were significantly higher in the invasive populations than native (P = 0.043 and, P = 0.014, respectively).

Bottom Line: A highly invasive freshwater fish, it is currently found in at least 32 countries outside its native range.Based on coalescent theory, all introduced and some native populations showed a relative excess of nucleotide diversity compared to haplotype diversity.Furthermore, it was preceded by, or associated with, the admixture of genetically diverse source populations that may have augmented its invasive-potential.

View Article: PubMed Central - PubMed

Affiliation: Evolutionary Biology Group, Department of Biological Sciences, University of Hull, Hull, United Kingdom. a.simon@2007.hull.ac.uk

ABSTRACT
The Asian cyprinid fish, the topmouth gudgeon (Pseudorasbora parva), was introduced into Europe in the 1960s. A highly invasive freshwater fish, it is currently found in at least 32 countries outside its native range. Here we analyse a 700 base pair fragment of the mitochondrial cytochrome b gene to examine different models of colonisation and spread within the invasive range, and to investigate the factors that may have contributed to their invasion success. Haplotype and nucleotide diversity of the introduced populations from continental Europe was higher than that of the native populations, although two recently introduced populations from the British Isles showed low levels of variability. Based on coalescent theory, all introduced and some native populations showed a relative excess of nucleotide diversity compared to haplotype diversity. This suggests that these populations are not in mutation-drift equilibrium, but rather that the relative inflated level of nucleotide diversity is consistent with recent admixture. This study elucidates the colonisation patterns of P. parva in Europe and provides an evolutionary framework of their invasion. It supports the hypothesis that their European colonisation was initiated by their introduction to a single location or small geographic area with subsequent complex pattern of spread including both long distance and stepping-stone dispersal. Furthermore, it was preceded by, or associated with, the admixture of genetically diverse source populations that may have augmented its invasive-potential.

Show MeSH
Related in: MedlinePlus