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Environmental and climatic determinants of molecular diversity and genetic population structure in a coenagrionid damselfly.

Wellenreuther M, SΓ‘nchez-GuillΓ©n RA, Cordero-Rivera A, Svensson EI, Hansson B - PLoS ONE (2011)

Bottom Line: We found low to moderate genetic sub-structuring between populations (mean F(ST)β€Š=β€Š0.06, D(est)β€Š=β€Š0.12), and an effect of longitude, but not latitude, on genetic diversity.No significant effects of geographic boundaries (e.g. water bodies) were found.Finally, we did not detect any molecular signatures of range expansions or an effect of geographic suitability, although local precipitation had a strong effect on genetic differentiation.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, Lund University, Lund, Sweden. maren.wellenreuther@biol.lu.se

ABSTRACT
Identifying environmental factors that structure intraspecific genetic diversity is of interest for both habitat preservation and biodiversity conservation. Recent advances in statistical and geographical genetics make it possible to investigate how environmental factors affect geographic organisation and population structure of molecular genetic diversity within species. Here we present a study on a common and wide ranging insect, the blue tailed damselfly Ischnuraelegans, which has been the target of many ecological and evolutionary studies. We addressed the following questions: (i) Is the population structure affected by longitudinal or latitudinal gradients?; (ii) Do geographic boundaries limit gene flow?; (iii) Does geographic distance affect connectivity and is there a signature of past bottlenecks?; (iv) Is there evidence of a recent range expansion and (vi) what is the effect of geography and climatic factors on population structure? We found low to moderate genetic sub-structuring between populations (mean F(ST)β€Š=β€Š0.06, D(est)β€Š=β€Š0.12), and an effect of longitude, but not latitude, on genetic diversity. No significant effects of geographic boundaries (e.g. water bodies) were found. F(ST)-and D(est)-values increased with geographic distance; however, there was no evidence for recent bottlenecks. Finally, we did not detect any molecular signatures of range expansions or an effect of geographic suitability, although local precipitation had a strong effect on genetic differentiation. The population structure of this small insect has probably been shaped by ecological factors that are correlated with longitudinal gradients, geographic distances, and local precipitation. The relatively weak global population structure and high degree of genetic variation within populations suggest that I. elegans has high dispersal ability, which is consistent with this species being an effective and early coloniser of new habitats.

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Related in: MedlinePlus

Linear regression between longitude and allelic richness of                                I. elegans populations                            (nβ€Š=β€Š22, rβ€Š=β€Š0.51,                            p<0.0015).
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pone-0020440-g002: Linear regression between longitude and allelic richness of I. elegans populations (nβ€Š=β€Š22, rβ€Š=β€Š0.51, p<0.0015).

Mentions: The geographic pattern of genetic variation measured as the number of alleles of I. elegans populations revealed a significant longitudinal cline (rβ€Š=β€Š0.51, r2β€Š=β€Š0.26, p<0.015; Figure 2A). There was a border-line significant relationship between longitude and expected heterozygosity (rβ€Š=β€Š0.40, r2β€Š=β€Š0.16, pβ€Š=β€Š0.069; Figure 2B). Regressions between longitude and observed heterozygosity and allelic richness were not significant, but both were positive in sign (rβ€Š=β€Š0.32 and rβ€Š=β€Š0.27, respectively). None of the regressions between genetic diversity and latitude were significant (p>0.05) and are therefore not shown.


Environmental and climatic determinants of molecular diversity and genetic population structure in a coenagrionid damselfly.

Wellenreuther M, SΓ‘nchez-GuillΓ©n RA, Cordero-Rivera A, Svensson EI, Hansson B - PLoS ONE (2011)

Linear regression between longitude and allelic richness of                                I. elegans populations                            (nβ€Š=β€Š22, rβ€Š=β€Š0.51,                            p<0.0015).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3105071&req=5

pone-0020440-g002: Linear regression between longitude and allelic richness of I. elegans populations (nβ€Š=β€Š22, rβ€Š=β€Š0.51, p<0.0015).
Mentions: The geographic pattern of genetic variation measured as the number of alleles of I. elegans populations revealed a significant longitudinal cline (rβ€Š=β€Š0.51, r2β€Š=β€Š0.26, p<0.015; Figure 2A). There was a border-line significant relationship between longitude and expected heterozygosity (rβ€Š=β€Š0.40, r2β€Š=β€Š0.16, pβ€Š=β€Š0.069; Figure 2B). Regressions between longitude and observed heterozygosity and allelic richness were not significant, but both were positive in sign (rβ€Š=β€Š0.32 and rβ€Š=β€Š0.27, respectively). None of the regressions between genetic diversity and latitude were significant (p>0.05) and are therefore not shown.

Bottom Line: We found low to moderate genetic sub-structuring between populations (mean F(ST)β€Š=β€Š0.06, D(est)β€Š=β€Š0.12), and an effect of longitude, but not latitude, on genetic diversity.No significant effects of geographic boundaries (e.g. water bodies) were found.Finally, we did not detect any molecular signatures of range expansions or an effect of geographic suitability, although local precipitation had a strong effect on genetic differentiation.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, Lund University, Lund, Sweden. maren.wellenreuther@biol.lu.se

ABSTRACT
Identifying environmental factors that structure intraspecific genetic diversity is of interest for both habitat preservation and biodiversity conservation. Recent advances in statistical and geographical genetics make it possible to investigate how environmental factors affect geographic organisation and population structure of molecular genetic diversity within species. Here we present a study on a common and wide ranging insect, the blue tailed damselfly Ischnuraelegans, which has been the target of many ecological and evolutionary studies. We addressed the following questions: (i) Is the population structure affected by longitudinal or latitudinal gradients?; (ii) Do geographic boundaries limit gene flow?; (iii) Does geographic distance affect connectivity and is there a signature of past bottlenecks?; (iv) Is there evidence of a recent range expansion and (vi) what is the effect of geography and climatic factors on population structure? We found low to moderate genetic sub-structuring between populations (mean F(ST)β€Š=β€Š0.06, D(est)β€Š=β€Š0.12), and an effect of longitude, but not latitude, on genetic diversity. No significant effects of geographic boundaries (e.g. water bodies) were found. F(ST)-and D(est)-values increased with geographic distance; however, there was no evidence for recent bottlenecks. Finally, we did not detect any molecular signatures of range expansions or an effect of geographic suitability, although local precipitation had a strong effect on genetic differentiation. The population structure of this small insect has probably been shaped by ecological factors that are correlated with longitudinal gradients, geographic distances, and local precipitation. The relatively weak global population structure and high degree of genetic variation within populations suggest that I. elegans has high dispersal ability, which is consistent with this species being an effective and early coloniser of new habitats.

Show MeSH
Related in: MedlinePlus