Population genetic structure and hybridization patterns in the cryptic sister species Chironomus riparius and Chironomus piger across differentially polluted freshwater systems

Pedrosa, João A.M.; Cocchiararo, Berardino; Verdelhos, Tiago; Soares, Amadeu M.V.M.; Pestana, João L.T.; Nowak, Carsten

doi:10.1016/j.ecoenv.2017.03.004

Cited by 7 publications

(9 citation statements)

References 66 publications

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“…Hybridisation of the sister-species is possible under laboratory conditions (Keyl 1963 and own observations), though previous studies found little evidence for ongoing hybridisation in the field (Hägele 1999;Pedrosa et al 2017b;Pfenninger & Nowak 2008;Pfenninger et al 2007).…”

Section: Population Genetic Simulations Underestimate Neutral Divergementioning

confidence: 85%

“…The closest relative to C. riparius is the morphologically cryptic sisterspecies C. piger that shares the same habitats (Schmidt et al 2013). C. piger is described to occur in Northern and Central Europe (Grebenjuk & Tomilina 2014;Ilkova et al 2007;Michailova et al 2015;Pedrosa et al 2017b;Sokolova et al 1992), widely overlapping with the C. riparius distribution range. During sampling for this study, we also found co-occurrence of the two species at the Northern-most sampling sites (MG and NMF) and the discrepancy between empirical and simulated F ST distributions was especially large in comparisons with those two populations.…”

Section: Population Genetic Simulations Underestimate Neutral Divergementioning

confidence: 99%

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The genomic footprint of climate adaptation inChironomus riparius

Oppold

Wieser

Schell

et al. 2017

Preprint

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The gradual heterogeneity of climatic factors pose varying selection pressures across geographic distances that leave signatures of clinal variation in the genome. Separating signatures of clinal adaptation from signatures of other evolutionary forces, such as demographic processes, genetic drift, and adaptation to non-clinal conditions of the immediate local environment is a major challenge. Here, we examine climate adaptation in five natural populations of the harlequin fly Chironomus riparius sampled along a climatic gradient across Europe. Our study integrates experimental data, individual genome resequencing, Pool-Seq data, and population genetic modelling. Common-garden experiments revealed a positive correlation of population growth rates corresponding to the population origin along the climate gradient, suggesting thermal adaptation on the phenotypic level. Based on a population genomic analysis, we derived empirical estimates of historical demography and migration. We used an F ST outlier approach to infer positive selection across the climate gradient, in combination with an environmental association analysis. In total we identified 162 candidate genes as genomic basis of climate adaptation. Enriched functions among these candidate genes involved the apoptotic process and molecular response to heat, as well as functions identified in other studies of climate adaptation in other insects. Our results show that local climate conditions impose strong selection pressures and lead to genomic adaptation despite strong gene flow. Moreover, these results imply that selection to different climatic conditions seems to converge on a functional level, at least between different insect species.

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Section: Population Genetic Simulations Underestimate Neutral Divergementioning

confidence: 85%

Section: Population Genetic Simulations Underestimate Neutral Divergementioning

confidence: 99%

The genomic footprint of climate adaptation inChironomus riparius

Oppold

Wieser

Schell

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…During sampling for this study, we also found cooccurrence of the two species at the Northern‐most sampling sites (MG and NMF), and the discrepancy between empirical and simulated F ST distributions was especially large in comparisons with those two populations. Hybridization of the sister species is possible under laboratory conditions (Keyl, and own observations), though previous studies found little evidence for ongoing hybridization in the field (Hägele, ; Pedrosa, Cocchiararo, Verdelhos et al., ; Pfenninger & Nowak, ; Pfenninger et al., ). Experimental analysis of niche segregation between the sister species showed that C. riparius had a higher fitness at higher constant temperatures and larger daily temperature ranges (Nemec, Hess, Nowak, & Pfenninger, ).…”

Section: Discussionmentioning

confidence: 96%

“…The closest relative to C. riparius is the morphologically cryptic sister-species C. piger that shares the same habitats (Schmidt, Greshake, Feldmeyer, Hankeln, & Pfenninger, 2013). C. piger is described to occur in Northern and Central Europe (Grebenjuk & Tomilina, 2014;Ilkova et al, 2007;Michailova, Ilkova, Dean, & White, 2015;Pedrosa, Cocchiararo, Verdelhos et al, 2017;Sokolova, Paliy, & Izvekova, 1992), widely overlapping with the C. riparius distribution range. During sampling for this study, we also found cooccurrence of the two species at the Northern-most sampling sites (MG and NMF), and the discrepancy between empirical and simulated F ST distributions was especially large in comparisons with those two populations.…”

mentioning

confidence: 99%

The genomic footprint of climate adaptation in Chironomus riparius

et al. 2018

View full text Add to dashboard Cite

The gradual heterogeneity of climatic factors poses varying selection pressures across geographic distances that leave signatures of clinal variation in the genome. Separating signatures of clinal adaptation from signatures of other evolutionary forces, such as demographic processes, genetic drift and adaptation, to nonclinal conditions of the immediate local environment is a major challenge. Here, we examine climate adaptation in five natural populations of the harlequin fly Chironomus riparius sampled along a climatic gradient across Europe. Our study integrates experimental data, individual genome resequencing, Pool-Seq data and population genetic modelling. Common-garden experiments revealed significantly different population growth rates at test temperatures corresponding to the population origin along the climate gradient, suggesting thermal adaptation on the phenotypic level. Based on a population genomic analysis, we derived empirical estimates of historical demography and migration. We used an F outlier approach to infer positive selection across the climate gradient, in combination with an environmental association analysis. In total, we identified 162 candidate genes as genomic basis of climate adaptation. Enriched functions among these candidate genes involved the apoptotic process and molecular response to heat, as well as functions identified in studies of climate adaptation in other insects. Our results show that local climate conditions impose strong selection pressures and lead to genomic adaptation despite strong gene flow. Moreover, these results imply that selection to different climatic conditions seems to converge on a functional level, at least between different insect species.

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“…Investigations were conducted at reference sites contaminated by metals in northwestern Portugal by Pedrosa et al (2017). The aim was to determine the variation in genetics in populations of the model species having ecotoxicological importance such as chironomus riparius and its cryptic sister species chironomus piger.…”

Section: Broad Field Studies and Surveysmentioning

confidence: 99%

Effects of Pollution on Freshwater Organisms

Choudri

Charabi²,

Ahmed³

2018

Water Environment Research

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The scientific literature review in this paper includes research papers published in 2017 on issues related to pollutants from human activity and its effects on organisms of freshwater reported from the different parts of the world. The fist part of the literature review highlights on two broad sections that are focused on research conducted at the field level as well as surveys based on field experiments. A number of sections categorized in order to reflect the different class of pollutants follows the first part of literature review. Sections in this part of review includes non-point source pollution, stormwater, wastewater, nutrients, sediment cap materials and suspended clays, botanical extracts, surfactants, metals, persistent organic pollutants, pharmaceuticals, endocrine disruptors, pesticides, petroleum hydrocarbons and polycyclic aromatic hydrocarbons, nanomaterials and ionic liquids. The final part of the literature review highlights the published research on recent innovations of recent in addressing problem of pollution in the freshwater and its management.

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Population genetic structure and hybridization patterns in the cryptic sister species Chironomus riparius and Chironomus piger across differentially polluted freshwater systems

Cited by 7 publications

References 66 publications

The genomic footprint of climate adaptation inChironomus riparius

The genomic footprint of climate adaptation inChironomus riparius

The genomic footprint of climate adaptation in Chironomus riparius

Effects of Pollution on Freshwater Organisms

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