Genome‐wide single‐generation signatures of local selection in the panmictic <scp>E</scp>uropean eel

Pujolar, J. M.; Jacobsen, Marianne; Als, Thomas Damm; Frydenberg, Jane; Munch, Kasper; Jónsson, Bjarni; Jian, Jinbao; Cheng, Lei; Maes, Grégory E.; Bernatchez, Louis; Hansen, Martin

doi:10.1111/mec.12753

Cited by 140 publications

(178 citation statements)

References 80 publications

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“…Consistent with this, we have observed evidence for both phenotypic plasticity and genetic adaptation to climate across a number of eucalypt species. Genomic surveys suggest that genetic adaptation to climate is likely to be a genome-wide phenomenon, involving a range of mutations in a diversity of genes and gene families across all chromosomes (Turner et al 2008;Pujolar et al 2014;Nicotra et al 2015 As it becomes feasible to analyse larger and more strategic datasets that minimise autocorrelations among climate variables, it will be possible to gain more specific insights into the drivers and mechanisms underpinning climate adaptation (e.g. maximum temperature thresholds).…”

Section: Discussionmentioning

confidence: 99%

Climate adaptation and ecological restoration in eucalypts

Prober¹,

Potts²,

Bailey³

et al. 2016

Proc. R. Soc. Vic.

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Eucalypts are the cornerstone of ecological restoration efforts across the highly modified agricultural landscapes of southern Australia. \u27Local provenancing\u27 is the established strategy for sourcing germplasm for ecological restoration plantings, yet this approach gives little consideration to the persistence of these plantings under future climates. This paper provides a synopsis of recent and ongoing research that the authors are undertaking on climate adaptation in eucalypts, combining new genomic approaches with ecophysiological evidence from provenance trials. These studies explore how adaptive diversity is distributed within and among populations, whether populations are buffered against change through capacity for phenotypic plasticity, and how this informs provenancing strategies. Results to date suggest that eucalypts have some capacity to respond to future environmental instability through adaptive phenotypic plasticity or selection of putatively adaptive alleles. Despite this, growing evidence suggests that eucalypts will still be vulnerable to change. Provenancing strategies that exploit adaptations found in non-local provenances could thus confer greater climate-resilience in ecological restoration plantings, although they will also need to account for potential interactions between climate adaptations and other factors (e.g. cryptic evolutionary variation, non-climate-related adaptations, herbivory and elevated CO2)

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Section: Discussionmentioning

confidence: 99%

Climate adaptation and ecological restoration in eucalypts

Prober¹,

Potts²,

Bailey³

et al. 2016

Proc. R. Soc. Vic.

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“…The individuals belonged to samples genotyped based on either the Fluidigm 96.96 Dynamic Arrays (N = 12) this study) or RAD sequencing (N = 7) . The seven RAD sequenced individuals from Pujolar et al (2014b) were previously analyzed using STRUCTURE and the 'gensback' (G) option. This option allows testing whether an individual has an immigrant ancestor in the last G generations (Pritchard et al, 2000;Falush et al, 2003Falush et al, , 2007.…”

Section: Cytonuclear Incompatibility In Hybridsmentioning

confidence: 99%

“…This option allows testing whether an individual has an immigrant ancestor in the last G generations (Pritchard et al, 2000;Falush et al, 2003Falush et al, , 2007. However, the study by Pujolar et al (2014b) only used a G of five (corresponding to the fourth-generation backcross category), and thus some individuals potentially having an older immigrant ancestor may have been wrongly assigned. As erroneous hybrid assignment may bias the assessment of possible cytonuclear selection, we reanalyzed the data using a G option of 9 (corresponding to the eightgeneration backcross category) and furthermore evaluated assignment power in STRUCTURE.…”

Section: Cytonuclear Incompatibility In Hybridsmentioning

confidence: 99%

“…This is possibly a consequence of an intermediate larval migration behavior, where F1 hybrids either actively or passively get transported to Iceland, approximately located longitudinally intermediate between North America and Europe (Avise et al, 1990;Pujolar et al, 2014a). In continental Europe and North America, only few later-generation backcrosses have been observed (Albert et al, 2006;Pujolar et al, 2014b), suggesting strong postzygotic barriers. One such barrier has been proposed to be cytonuclear incompatibility (Gagnaire et al, 2012), based on the finding of significant inter-species nonsynonymous differentiation in genes involved in the ATP synthase complex (Gagnaire et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Assessing pre- and post-zygotic barriers between North Atlantic eels (Anguilla anguilla and A. rostrata)

et al. 2016

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Elucidating barriers to gene flow is important for understanding the dynamics of speciation. Here we investigate pre-and post-zygotic mechanisms acting between the two hybridizing species of Atlantic eels: Anguilla anguilla and A. rostrata. Temporally varying hybridization was examined by analyzing 85 species-diagnostic single-nucleotide polymorphisms (SNPs; F ST ⩾ 0.95) in eel larvae sampled in the spawning region in the Sargasso Sea in 2007 (N = 92) and 2014 (N = 460). We further investigated whether genotypes at these SNPs were nonrandomly distributed in post-F1 hybrids, indicating selection. Finally, we sequenced the mitochondrial ATP6 and nuclear ATP5c1 genes in 19 hybrids, identified using SNP and restriction site associated DNA (RAD) sequencing data, to test a previously proposed hypothesis of cytonuclear incompatibility leading to adenosine triphosphate (ATP) synthase dysfunction and selection against hybrids. No F1 hybrids but only later backcrosses were observed in the Sargasso Sea in 2007 and 2014. This suggests that interbreeding between the two species only occurs in some years, possibly controlled by environmental conditions at the spawning grounds, or that interbreeding has diminished through time as a result of a declining number of spawners. Moreover, potential selection was found at the nuclear and the cytonuclear levels. Nonetheless, one glass eel individual showed a mismatch, involving an American ATP6 haplotype and European ATP5c1 alleles. This contradicted the presence of cytonuclear incompatibility but may be explained by that (1) cytonuclear incompatibility is incomplete, (2) selection acts at a later life stage or (3) other genes are important for protein function. In total, the study demonstrates the utility of genomic data when examining pre-and post-zyotic barriers in natural hybrids.

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“…Therefore, an implication of the results by NaisbettJones and co-workers [9] relates to the paradigmatic view that eels use a panmictic, i.e. random, mode of reproduction [15,16]. The few alternative hypotheses to panmixia suggest a temporal displacement of genetically distinct cohorts of progenitors [17] or a spatial segregation within the Sargasso Sea of genetically distinct spawning groups, with highly philopatric adult females and male-mediated gene flow among groups [13].…”

mentioning

confidence: 99%