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A test for within ‐ lake niche differentiation in the nine ‐ spined sticklebacks ( Pungitius pungitius )

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ABSTRACT

Specialization for the use of different resources can lead to ecological speciation. Accordingly, there are numerous examples of ecologically specialized pairs of fish “species” in postglacial lakes. Using a polymorphic panel of single nucleotide variants, we tested for genetic footprints of within‐lake population stratification in nine‐spined sticklebacks (Pungitius pungitius) collected from three habitats (viz. littoral, benthic, and pelagic) within a northern Swedish lake. Analyses of admixture, population structure, and relatedness all supported the conclusion that the fish from this lake form a single interbreeding unit.

No MeSH data available.


Analysis of population structure among three samples (littoral, benthic, and pelagic) of nine‐spined sticklebacks from a single lake based on principal component analysis of kinship matrix.
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ece32182-fig-0002: Analysis of population structure among three samples (littoral, benthic, and pelagic) of nine‐spined sticklebacks from a single lake based on principal component analysis of kinship matrix.

Mentions: The degree of genetic differentiation among the three putative populations was low, with Fst = 0.0002. Principal component analyses supported the lack of population structure in the data: The plot of the two first principal components of the kinship matrix did not reveal any clustering, suggesting that the sampled individuals came from the same population (Fig. 2). Comparison of the observed Fst in the data with the simulation results revealed that, for a population divided into three subpopulations with an Fst of ~ 0.1, our result was never part of the sampling distribution (Fig. S1A). This suggests that it is very unlikely that our data could have been sampled from a population with that level of Fst between subpopulations. On the other hand, when comparing the empirically derived Fst with a simulated population with three subpopulations having Fst ≈ 0.0025, the empirical Fst was not significantly different than what could be expected from a random sample from this population (empirical P‐value = 0.11; Fig. S1B). These results suggest that the lake population is genetically very weakly structured, most likely at a level no greater than Fst ≈ 0.0025.


A test for within ‐ lake niche differentiation in the nine ‐ spined sticklebacks ( Pungitius pungitius )
Analysis of population structure among three samples (littoral, benthic, and pelagic) of nine‐spined sticklebacks from a single lake based on principal component analysis of kinship matrix.
© Copyright Policy - creativeCommonsBy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4979704&req=5

ece32182-fig-0002: Analysis of population structure among three samples (littoral, benthic, and pelagic) of nine‐spined sticklebacks from a single lake based on principal component analysis of kinship matrix.
Mentions: The degree of genetic differentiation among the three putative populations was low, with Fst = 0.0002. Principal component analyses supported the lack of population structure in the data: The plot of the two first principal components of the kinship matrix did not reveal any clustering, suggesting that the sampled individuals came from the same population (Fig. 2). Comparison of the observed Fst in the data with the simulation results revealed that, for a population divided into three subpopulations with an Fst of ~ 0.1, our result was never part of the sampling distribution (Fig. S1A). This suggests that it is very unlikely that our data could have been sampled from a population with that level of Fst between subpopulations. On the other hand, when comparing the empirically derived Fst with a simulated population with three subpopulations having Fst ≈ 0.0025, the empirical Fst was not significantly different than what could be expected from a random sample from this population (empirical P‐value = 0.11; Fig. S1B). These results suggest that the lake population is genetically very weakly structured, most likely at a level no greater than Fst ≈ 0.0025.

View Article: PubMed Central - PubMed

ABSTRACT

Specialization for the use of different resources can lead to ecological speciation. Accordingly, there are numerous examples of ecologically specialized pairs of fish “species” in postglacial lakes. Using a polymorphic panel of single nucleotide variants, we tested for genetic footprints of within‐lake population stratification in nine‐spined sticklebacks (Pungitius pungitius) collected from three habitats (viz. littoral, benthic, and pelagic) within a northern Swedish lake. Analyses of admixture, population structure, and relatedness all supported the conclusion that the fish from this lake form a single interbreeding unit.

No MeSH data available.