Latest recommendations
Id | Title * | Authors * | Abstract * ▲ | Picture * | Thematic fields * | Recommender | Reviewers | Submission date | |
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04 Sep 2019
The discernible and hidden effects of clonality on the genotypic and genetic states of populations: improving our estimation of clonal ratesSolenn Stoeckel, Barbara Porro, Sophie Arnaud-Haond https://doi.org/10.48550/arXiv.1902.09365How to estimate clonality from genetic data: use large samples and consider the biology of the speciesRecommended by Myriam Heuertz based on reviews by David Macaya-Sanz, Marcela Van Loo and 1 anonymous reviewerPopulation geneticists frequently use the genetic and genotypic information of a population sample of individuals to make inferences on the reproductive system of a species. The detection of clones, i.e. individuals with the same genotype, can give information on whether there is clonal (vegetative) reproduction in the species. If clonality is detected, population geneticists typically use genotypic richness R, the number of distinct genotypes relative to the sample size, to estimate the rate of clonality c, which can be defined as the proportion of reproductive events that are clonal. Estimating the rate of clonality based on genotypic richness is however problematic because, to date, there is no analytical, nor simulation-based, characterization of this relationship. Furthermore, the effect of sampling on this relationship has never been critically examined. References [1] Stoeckel, S., Porro, B., and Arnaud-Haond, S. (2019). The discernible and hidden effects of clonality on the genotypic and genetic states of populations: improving our estimation of clonal rates. ArXiv:1902.09365 [q-Bio] v4 peer-reviewed and recommended by Peer Community in Evolutionary Biology. Retrieved from http://arxiv.org/abs/1902.09365v4 | The discernible and hidden effects of clonality on the genotypic and genetic states of populations: improving our estimation of clonal rates | Solenn Stoeckel, Barbara Porro, Sophie Arnaud-Haond | <p>Partial clonality is widespread across the tree of life, but most population genetics models are conceived for exclusively clonal or sexual organisms. This gap hampers our understanding of the influence of clonality on evolutionary trajectories... | Population Genetics / Genomics, Reproduction and Sex | Myriam Heuertz | 2019-02-28 10:10:56 | View | ||
14 May 2020
Potential adaptive divergence between subspecies and populations of snapdragon plants inferred from QST – FST comparisonsSara Marin, Anaïs Gibert, Juliette Archambeau, Vincent Bonhomme, Mylène Lascoste and Benoit Pujol https://doi.org/10.5281/zenodo.3628168From populations to subspecies… to species? Contrasting patterns of local adaptation in closely-related taxa and their potential contribution to species divergenceRecommended by Emmanuelle Porcher based on reviews by Sophie Karrenberg, Santiago C. Gonzalez-Martinez and 1 anonymous reviewerElevation gradients are convenient and widely used natural setups to study local adaptation, particularly in these times of rapid climate change [e.g. 1]. Marin and her collaborators [2] did not follow the mainstream, however. Instead of tackling adaptation to climate change, they used elevation gradients to address another crucial evolutionary question [3]: could adaptation to altitude lead to ecological speciation, i.e. reproductive isolation between populations in spite of gene flow? More specifically, they examined how much local adaptation to environmental variation differed among closely-related, recently diverged subspecies. They studied several populations of two subspecies of snapdragon (Antirrhinum majus), with adjacent geographical distributions. Using common garden experiments and the classical, but still useful, QST-FST comparison, they demonstrate contrasting patterns of local adaptation to altitude between the two subspecies, with several traits under divergent selection in A. majus striatum but none in A. majus pseudomajus. These differences in local adaptation may contribute to species divergence, and open many stimulating questions on the underlying mechanisms, such as the identity of environmental drivers or contribution of reproductive isolation involving flower color polymorphism. References [1] Anderson, J. T., and Wadgymar, S. M. (2020). Climate change disrupts local adaptation and favours upslope migration. Ecology letters, 23(1), 181-192. doi: 10.1111/ele.13427 | Potential adaptive divergence between subspecies and populations of snapdragon plants inferred from QST – FST comparisons | Sara Marin, Anaïs Gibert, Juliette Archambeau, Vincent Bonhomme, Mylène Lascoste and Benoit Pujol | <p>Phenotypic divergence among natural populations can be explained by natural selection or by neutral processes such as drift. Many examples in the literature compare putatively neutral (FST) and quantitative genetic (QST) differentiation in mult... | Adaptation, Evolutionary Ecology, Genotype-Phenotype, Morphological Evolution, Quantitative Genetics | Emmanuelle Porcher | 2018-08-05 15:34:30 | View | ||
03 Apr 2017
Things softly attained are long retained: Dissecting the Impacts of Selection Regimes on Polymorphism Maintenance in Experimental Spatially Heterogeneous EnvironmentsRomain Gallet, Rémy Froissart, Virginie Ravigné https://doi.org/10.1101/100743Experimental test of the conditions of maintenance of polymorphism under hard and soft selectionRecommended by Stephanie Bedhomme based on reviews by Joachim Hermisson and 2 anonymous reviewers
Theoretical work, initiated by Levene (1953) [1] and Dempster (1955) [2], suggests that within a given environment, the way populations are regulated and contribute to the next generation is a key factor for the maintenance of local adaptation polymorphism. In this theoretical context, hard selection describes the situation where the genetic composition of each population affects its contribution to the next generation whereas soft selection describes the case where the contribution of each population is fixed, whatever its genetic composition. Soft selection is able to maintain polymorphism, whereas hard selection invariably leads to the fixation of one of the alleles. Although the specific conditions (e.g. of migration between populations or drift level) in which this prediction holds have been studied in details by theoreticians, experimental tests have mainly failed, usually leading to the conclusion that the allele frequency dynamics was driven by other mechanisms in the experimental systems and conditions used. Gallet, Froissart and Ravigné [3] have set up a bacterial experimental system which allowed them to convincingly demonstrate that soft selection generates the conditions for polymorphism maintenance when hard selection does not, everything else being equal. The key ingredients of their experimental system are (1) the possibility to accurately produce hard and soft selection regimes when daily transferring the populations and (2) the ability to establish artificial well-characterized reproducible trade-offs. To do so, they used two genotypes resisting each one to one antibiotic and combined, across habitats, low antibiotic doses and difference in medium productivity. The experimental approach contains two complementary parts: the first one is looking at changes in the frequencies of two genotypes, initially introduced at around 50% each, over a small number of generations (ca 40) in different environments and selection regimes (soft/hard) and the second one is convincingly showing polymorphism protection by establishing that in soft selection regimes, the lowest fitness genotype is not eliminated even when introduced at low frequency. In this manuscript, a key point is the dialog between theoretical and experimental approaches. The experiments have been thought and designed to be as close as possible to the situations analysed in theoretical work. For example, the experimental polymorphism protection test (experiment 2) closely matches the equivalent analysis classically performed in theoretical approaches. This close fit between theory and experiment is clearly a strength of this study. This said, the experimental system allowing them to realise this close match also has some limitations. For example, changes in allele frequencies could only be monitored over a quite low number of generations because a longer time-scale would have allowed the contribution of de novo mutations and the likely emergence of a generalist genotype resisting to both antibiotics used to generate the local adaptation trade-offs. These limitations, as well as the actual significance of the experimental tests, are discussed in deep details in the manuscript. References [1] Levene H. 1953. Genetic equilibrium when more than one niche is available. American Naturalist 87: 331–333. doi: 10.1086/281792 [2] Dempster ER. 1955. Maintenance of genetic heterogeneity. Cold Spring Harbor Symposia on Quantitative Biology. 20: 25–32. doi: 10.1101/SQB.1955.020.01.005 [3] Gallet R, Froissart R, Ravigné V. 2017. Things softly attained are long retained: dissecting the impacts of selection regimes on polymorphism maintenance in experimental spatially heterogeneous environments. bioRxiv 100743; doi: 10.1101/100743 | Things softly attained are long retained: Dissecting the Impacts of Selection Regimes on Polymorphism Maintenance in Experimental Spatially Heterogeneous Environments | Romain Gallet, Rémy Froissart, Virginie Ravigné | <p>Predicting and managing contemporary adaption requires a proper understanding of the determinants of genetic variation. Spatial heterogeneity of the environment may stably maintain polymorphism when habitat contribution to the next generation c... | Adaptation, Evolutionary Theory | Stephanie Bedhomme | 2017-01-17 11:06:21 | View | ||
10 Jan 2019
Genomic data provides new insights on the demographic history and the extent of recent material transfers in Norway spruceJun Chen, Lili Li, Pascal Milesi, Gunnar Jansson, Mats Berlin, Bo Karlsson, Jelena Aleksic, Giovanni G Vendramin, Martin Lascoux https://doi.org/10.1101/402016Disentangling the recent and ancient demographic history of European spruce speciesRecommended by Jason Holliday based on reviews by 1 anonymous reviewerGenetic diversity in temperate and boreal forests tree species has been strongly affected by late Pleistocene climate oscillations [2,3,5], but also by anthropogenic forces. Particularly in Europe, where a long history of human intervention has re-distributed species and populations, it can be difficult to know if a given forest arose through natural regeneration and gene flow or through some combination of natural and human-mediated processes. This uncertainty can confound inferences of the causes and consequences of standing genetic variation, which may impact our interpretation of demographic events that shaped species before humans became dominant on the landscape. In their paper entitled "Genomic data provides new insights on the demographic history and the extent of recent material transfers in Norway spruce", Chen et al. [1] used a genome-wide dataset of 400k SNPs to infer the demographic history of Picea abies (Norway spruce), the most widespread and abundant spruce species in Europe, and to understand its evolutionary relationship with two other spruces (Picea obovata [Siberian spruce] and P. omorika [Serbian spruce]). Three major Norway spruce clusters were identified, corresponding to central Europe, Russia and the Baltics, and Scandinavia, which agrees with previous studies. The density of the SNP data in the present paper enabled inference of previously uncharacterized admixture between these groups, which corresponds to the timing of postglacial recolonization following the last glacial maximum (LGM). This suggests that multiple migration routes gave rise to the extant distribution of the species, and may explain why Chen et al.'s estimates of divergence times among these major Norway spruce groups were older (15mya) than those of previous studies (5-6mya) – those previous studies may have unknowingly included admixed material [4]. Treemix analysis also revealed extensive admixture between Norway and Siberian spruce over the last ~100k years, while the geographically-restricted Serbian spruce was both isolated from introgression and had a dramatically smaller effective population size (Ne) than either of the other two species. This small Ne resulted from a bottleneck associated with the onset of the iron age ~3000 years ago, which suggests that anthropogenic depletion of forest resources has severely impacted this species. Finally, ancestry of Norway spruce samples collected in Sweden and Denmark suggest their recent transfer from more southern areas of the species range. This northward movement of genotypes likely occurred because the trees performed well relative to local provenances, which is a common observation when trees from the south are planted in more northern locations (although at the potential cost of frost damage due to inappropriate phenology). While not the reason for the transfer, the incorporation of southern seed sources into the Swedish breeding and reforestation program may lead to more resilient forests under climate change. Taken together, the data and analysis presented in this paper allowed inference of the intra- and interspecific demographic histories of a tree species group at a very high resolution, and suggest caveats regarding sampling and interpretation of data from areas with a long history of occupancy by humans. References [1] Chen, J., Milesi, P., Jansson, G., Berlin, M., Karlsson, B., Aleksić, J. M., Vendramin, G. G., Lascoux, M. (2018). Genomic data provides new insights on the demographic history and the extent of recent material transfers in Norway spruce. BioRxiv, 402016. ver. 3 peer-reviewed and recommended by PCI Evol Biol. doi: 10.1101/402016 | Genomic data provides new insights on the demographic history and the extent of recent material transfers in Norway spruce | Jun Chen, Lili Li, Pascal Milesi, Gunnar Jansson, Mats Berlin, Bo Karlsson, Jelena Aleksic, Giovanni G Vendramin, Martin Lascoux | <p>Primeval forests are today exceedingly rare in Europe and transfer of forest reproductive material for afforestation and improvement have been very common, especially over the last two centuries. This can be a serious impediment when inferring ... | Evolutionary Applications, Hybridization / Introgression, Population Genetics / Genomics | Jason Holliday | Anonymous, Anonymous | 2018-08-29 08:33:15 | View | |
16 Dec 2020
Shifts from pulled to pushed range expansions caused by reduction of landscape connectivityMaxime Dahirel, Aline Bertin, Marjorie Haond, Aurélie Blin, Eric Lombaert, Vincent Calcagno, Simon Fellous, Ludovic Mailleret, Thibaut Malausa, Elodie Vercken https://doi.org/10.1101/2020.05.13.092775The push and pull between theory and data in understanding the dynamics of invasionRecommended by Ben Phillips based on reviews by Laura Naslund and 2 anonymous reviewersExciting times are afoot for those of us interested in the ecology and evolution of invasive populations. Recent years have seen evolutionary process woven firmly into our understanding of invasions (Miller et al. 2020). This integration has inspired a welter of empirical and theoretical work. We have moved from field observations and verbal models to replicate experiments and sophisticated mathematical models. Progress has been rapid, and we have seen science at its best; an intimate discussion between theory and data. References Bîrzu, G., Matin, S., Hallatschek, O., and Korolev, K. S. (2019). Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth. Ecology Letters, 22(11), 1817-1827. doi: https://doi.org/10.1111/ele.13364 | Shifts from pulled to pushed range expansions caused by reduction of landscape connectivity | Maxime Dahirel, Aline Bertin, Marjorie Haond, Aurélie Blin, Eric Lombaert, Vincent Calcagno, Simon Fellous, Ludovic Mailleret, Thibaut Malausa, Elodie Vercken | <p>Range expansions are key processes shaping the distribution of species; their ecological and evolutionary dynamics have become especially relevant today, as human influence reshapes ecosystems worldwide. Many attempts to explain and predict ran... | Evolutionary Applications, Evolutionary Dynamics, Evolutionary Ecology, Experimental Evolution, Phylogeography & Biogeography | Ben Phillips | 2020-08-04 12:51:56 | View | ||
05 Dec 2017
Reconstruction of body mass evolution in the Cetartiodactyla and mammals using phylogenomic dataEmeric Figuet, Marion Ballenghien, Nicolas Lartillot, Nicolas Galtier https://doi.org/10.1101/139147Predicting small ancestors using contemporary genomes of large mammalsRecommended by Bruce Rannala based on reviews by Bruce Rannala and 1 anonymous reviewerRecent methodological developments and increased genome sequencing efforts have introduced the tantalizing possibility of inferring ancestral phenotypes using DNA from contemporary species. One intriguing application of this idea is to exploit the apparent correlation between substitution rates and body size to infer ancestral species' body sizes using the inferred patterns of substitution rate variation among species lineages based on genomes of extant species [1]. References [1] Romiguier J, Ranwez V, Douzery EJP and Galtier N. 2013. Genomic evidence for large, long-lived ancestors to placental mammals. Molecular Biology and Evolution 30: 5–13. doi: 10.1093/molbev/mss211 [2] Figuet E, Ballenghien M, Lartillot N and Galtier N. 2017. Reconstruction of body mass evolution in the Cetartiodactyla and mammals using phylogenomic data. bioRxiv, ver. 3 of 4th December 2017. 139147. doi: 10.1101/139147 | Reconstruction of body mass evolution in the Cetartiodactyla and mammals using phylogenomic data | Emeric Figuet, Marion Ballenghien, Nicolas Lartillot, Nicolas Galtier | <p>Reconstructing ancestral characters on a phylogeny is an arduous task because the observed states at the tips of the tree correspond to a single realization of the underlying evolutionary process. Recently, it was proposed that ancestral traits... | Genome Evolution, Life History, Macroevolution, Molecular Evolution, Phylogenetics / Phylogenomics | Bruce Rannala | 2017-05-18 15:28:58 | View | ||
14 Dec 2016
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Evolution of resistance to single and combined floral phytochemicals by a bumble bee parasitePalmer-Young EC, Sadd BM, Adler LS https://doi.org/10.1111/jeb.13002The medicinal value of phytochemicals is hindered by pathogen evolution of resistanceRecommended by Alison Duncan and Sara MagalhaesAs plants cannot run from their enemies, natural selection has favoured the evolution of diverse chemical compounds (phytochemicals) to protect them against herbivores and pathogens. This provides an opportunity for plant feeders to exploit these compounds to combat their own enemies. Indeed, it is widely known that herbivores use such compounds as protection against predators [1]. Recently, this reasoning has been extended to pathogens, and elegant studies have shown that some herbivores feed on phytochemical-containing plants reducing both parasite abundance within hosts [2] and their virulence [3]. References [1] Duffey SS. 1980. Sequestration of plant natural products by insects. Annual Review of Entomology 25: 447-477. doi: 10.1146/annurev.en.25.010180.002311 [2] Richardson LL et al. 2015. Secondary metabolites in floral nectar reduce parasite infections in bumblebees. Proceedings of the Royal Society of London B 282: 20142471. doi: 10.1098/rspb.2014.2471 [3] Lefèvre T et al. 2010. Evidence for trans-generational medication in nature. Ecology Letters 13: 1485-93. doi: 10.1111/j.1461-0248.2010.01537.x [4] Palmer-Young EC, Sadd BM, Adler LS. 2017. Evolution of resistance to single and combined floral phytochemicals by a bumble bee parasite. Journal of Evolutionary Biology 30: 300-312. doi: 10.1111/jeb.13002 [5] Müller CB, Schmid-Hempel P. 1993. Exploitation of cold temperature as defence against parasitoids in bumblebees. Nature 363: 65-67. doi: 10.1038/363065a0 [6] Potts SG et al. 2010. Global pollinator declines: trends, impacts and drivers. Trends in Ecology and Evolution 25: 345-353. doi: 10.1016/j.tree.2010.01.007 | Evolution of resistance to single and combined floral phytochemicals by a bumble bee parasite | Palmer-Young EC, Sadd BM, Adler LS | <p>Repeated exposure to inhibitory compounds can drive the evolution of resistance, which weakens chemical defence against antagonists. Floral phytochemicals in nectar and pollen have antimicrobial properties that can ameliorate infection in polli... | Evolutionary Ecology | Alison Duncan | 2016-12-14 16:47:14 | View | ||
26 Aug 2024
Reproductive modes in populations of late-acting self-incompatible and self-compatible polyploid Ludwigia grandiflora subsp. hexapetala in western EuropeSolenn Stoeckel, Ronan Becheler, Luis Portillo-Lemus, Marilyne Harang, Anne-Laure Besnard, Gilles Lassalle, Romain Causse-Védrines, Sophie Michon-Coudouel, Daniel J. Park, Bernard J. Pope, Eric J. Petit, Dominique Barloy https://doi.org/10.1101/2024.03.21.586104Mixed reproduction modes explain a high genetic diversity in the invasive plant Ludwigia grandiflora subsp. hexapetala in western EuropeRecommended by Ines Alvarez based on reviews by Rubén Torices and 2 anonymous reviewersThe introduction of Ludwigia species as ornamental plants in both North America and Europe dates back almost two centuries, during which time they expanded as naturalized and later invasive species in these territories (Dandelot et al. 2005, Okada et al. 2009). Repeated deliberate or non-deliberate introductions over time of this species complex that can hybridize has given rise to an evolutionarily complex scenario, which is compounded by the difficulty in delimiting some of these species and by the diversity of their modes of reproduction. Dandelot (2004) and Dandelot et al. (2005) determined the presence of two Ludwigia taxa in France, L. peploides subsp. montevidensis (Spreng.) P.H.Raven (here after Lpm), and L. grandiflora subsp. hexapetala (Hook. & Arn.) G.L.Nesom & Kartesz (here after Lgh), based on their cytotypes (2n = 16, and 2n = 80, respectively) and without evidence of hybridization between them. Furthermore, despite a predominantly vegetative reproduction observed for both species, they differed in their breeding systems. While Lpm is self-compatible and produce a high number of viable seeds in all populations, Lgh is self-incompatible and its populations may drastically differ in seed viability (Dandelot 2004). Several years later, Portillo-Lemus et al. (2021) determined that the differences in seed production between some populations of Lgh are due to the existence of a heteromorphic reproductive system in this taxon, involving a self-incompatible morph (long-style morph; hereafter L-morph), and a self-compatible morph (short-style morph: hereafter S-morph). Moreover, Portillo-Lemus et al. (2022) observed that self-pollen in the L-morph flowers stop growing lately (i.e., in the ovarian area) without fertilizing the ovules, concluding that a late-acting self-incompatible system (hereafter, LSI) is present in this morph. At this point, it is relevant to understand the possible interactions between populations of different morphs in Lgh, and the implications that they may have on their expansive success in non-native areas in order to develop more effective management plans. To achieve this goal, Stoeckel et al. (2024) analyzed the population genetics in 53 Lgh populations in western Europe (without finding any Lpm population in the sampling area), 40 of which exclusively presented the L-morph and 13 the S-morph. This fact offered the opportunity to compare and interpret the differences between populations of different morphs in Lgh. Other previous works on genetic diversity of Lgh in peripatric or non-native areas pointed to a high clonality and an extremely low genetic diversity (Okada et al. 2009, Armitage et al. 2013), concluding in a monoclonal or few ancestral original clones for these invasive populations. However, the investigations of Stoeckel et al. (2024) found a high genetic diversity in all populations of Lgh studied despite their predominant clonal reproduction. Interestingly, they found that sexual reproduction is also present, not only in the S-morph by selfing, but also in the L-morph, although limited and preferably by allogamy. They discuss the advantages and drawbacks of the different modes of reproduction observed in Lgh populations, the interactions among them, and the implications that both, the scarcely documented LSI (Gibbs 2014) and selfing, have in the reproductive success and in the maintenance of the high genetic diversity observed in Lgh in western Europe. The contrasting results with the previous ones (Okada et al. 2009, Armitage et al. 2013) stress the relevance of using appropriate markers and analyses to assess the genetic diversity in autoployploid species, as well as the necessity of knowing the modes of reproduction in the populations studied for an optimal interpretation of the genetic metrics. The approach of the study by Stoeckel et al. (2024) had the challenge of having found suitable markers to deal with a taxon of complex origin such as Lgh, whose genome is compound by a set of autotetraploid chromosomes shared with Lpm and traces of ancient hybridizations of other diploid lineages (Barloy et al. 2024). Using RAD-Seq, Stoeckel et al. (2024) generated an original set of 36 polymorphic SNPs shared between Lgh and Lpm ensuring that these SNPs belong to the tetraploid part of the Lgh genome derived from Lpm. Another interesting contribution of this work is the exhaustive analysis of several genetic descriptors (indexes) and the interpretative guide they provide for each of them in relation to the different modes of reproduction of the study system. Finally, they propose a pair of very useful synthetic indices (i.e., clonality index and selfing index), since they allow to classify populations according to their levels of clonality and selfing. Stoeckel et al. (2024) conclude the relevance that selfing and LSI populations, and the hybridization between them may have on the expansion and success of invasive plant species, and the necessity to know the modes of reproduction of these populations jointly with their genetic diversity in order to develop appropriate management plans. This study raises new questions such as the modes of reproduction and genetic diversity and structure have other Lgh populations, both invasive and native, and the dynamics of these populations under different future scenarios. References Armitage, J. D., Könyves, K., Bailey, J. P., David, J. C., & Culham, A. (2013). A molecular, morphological and cytological investigation of the identity of non-native Ludwigia (Onagraceae) populations in Britain. New Journal of Botany, 3(2), 88–95. https://doi.org/10.1179/2042349713Y.0000000023 Barloy, D., Lemus, L. P.-, Krueger-Hadfield, S. A., Huteau, V., & Coriton, O. (2024). Genomic relationships among diploid and polyploid species of the genus Ludwigia L. section Jussiaea using a combination of cytogenetic, morphological, and crossing investigations. ver. 4 peer-reviewed and recommended by Peer Community in Evolutionary Biology. https://doi.org/10.1101/2023.01.02.522458 Dandelot, S. (2004). Les Ludwigia spp. invasives du Sud de la France: Historique, Biosystématique, Biologie et Ecologie [PhD thesis, Aix-Marseille 3]. https://www.theses.fr/2004AIX30052 Dandelot, S., Verlaque, R., Dutartre, A., & Cazaubon, A. (2005). Ecological, dynamic and taxonomic problems due to Ludwigia (Onagraceae) in France. Hydrobiologia, 551(1), 131–136. https://doi.org/10.1007/s10750-005-4455-0 Gibbs, P. E. (2014). Late-acting self-incompatibility – the pariah breeding system in flowering plants. New Phytologist, 203(3), 717–734. https://doi.org/10.1111/nph.12874 Okada, M., Grewell, B. J., & Jasieniuk, M. (2009). Clonal spread of invasive Ludwigia hexapetala and L. grandiflora in freshwater wetlands of California. Aquatic Botany, 91(3), 123–129. https://doi.org/10.1016/j.aquabot.2009.03.006 Portillo Lemus, L. O., Bozec, M., Harang, M., Coudreuse, J., Haury, J., Stoeckel, S., & Barloy, D. (2021). Self-incompatibility limits sexual reproduction rather than environmental conditions in an invasive water primrose. Plant-Environment Interactions, 2(2), 74–86. https://doi.org/10.1002/pei3.10042 Portillo Lemus, L. O., Harang, M., Bozec, M., Haury, J., Stoeckel, S., & Barloy, D. (2022). Late-acting self-incompatible system, preferential allogamy and delayed selfing in the heteromorphic invasive populations of Ludwigia grandiflora subsp. hexapetala. Peer Community Journal, 2. https://doi.org/10.24072/pcjournal.108 Stoeckel, S., Becheler, R., Portillo-Lemus, L., Harang, M., Besnard, A.-L., Lassalle, G., Causse-Védrines, R., Michon-Coudouel, S., Park D. J., Pope, B. J., Petit, E. J. & Barloy, D. (2024) Reproductive modes in populations of late-acting self-incompatible and self-compatible polyploid Ludwigia grandiflora subsp. hexapetala in western Europe. biorxiv, ver.4 peer-reviewed and recommended by PCI Evol Biol https://doi.org/10.1101/2024.03.21.586104 | Reproductive modes in populations of late-acting self-incompatible and self-compatible polyploid *Ludwigia grandiflora* subsp. hexapetala in western Europe | Solenn Stoeckel, Ronan Becheler, Luis Portillo-Lemus, Marilyne Harang, Anne-Laure Besnard, Gilles Lassalle, Romain Causse-Védrines, Sophie Michon-Coudouel, Daniel J. Park, Bernard J. Pope, Eric J. Petit, Dominique Barloy | <p>Reproductive mode, i.e., the proportion of individuals produced by clonality, selfing and outcrossing in populations, determines how hereditary material is transmitted through generations. It shapes genetic diversity and its structure over time... | Evolutionary Applications, Evolutionary Ecology, Population Genetics / Genomics, Reproduction and Sex | Ines Alvarez | 2024-03-25 10:33:17 | View | ||
16 Nov 2018
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen IslandsChristelle Fraïsse, Anne Haguenauer, Karin Gerard, Alexandra Anh-Thu Weber, Nicolas Bierne, Anne Chenuil https://doi.org/10.1101/239244Introgression from related species reveals fine-scale structure in an isolated population of mussels and causes patterns of genetic-environment associationsRecommended by Marianne Elias based on reviews by Thomas Broquet and Tatiana GiraudAssessing population connectivity is central to understanding population dynamics, and is therefore of great importance in evolutionary biology and conservation biology. In the marine realm, the apparent absence of physical barriers, large population sizes and high dispersal capacities of most organisms often result in no detectable structure, thereby hindering inferences of population connectivity. In a review paper, Gagnaire et al. [1] propose several ideas to improve detection of population connectivity. Notably, using simulations they show that under certain circumstances introgression from one species into another may reveal cryptic population structure within that second species. References [1] Gagnaire, P.-A., Broquet, T., Aurelle, D., Viard, F., Souissi, A., Bonhomme, F., Arnaud-Haond, S., & Bierne, N. (2015). Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era. Evolutionary Applications, 8, 769–786. doi: 10.1111/eva.12288 | Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands | Christelle Fraïsse, Anne Haguenauer, Karin Gerard, Alexandra Anh-Thu Weber, Nicolas Bierne, Anne Chenuil | <p>Reticulated evolution -i.e. secondary introgression / admixture between sister taxa- is increasingly recognized as playing a key role in structuring infra-specific genetic variation and revealing cryptic genetic connectivity patterns. When admi... | Hybridization / Introgression, Phylogeography & Biogeography, Population Genetics / Genomics | Marianne Elias | 2017-12-28 14:16:16 | View | ||
07 Nov 2019
New insights into the population genetics of partially clonal organisms: when seagrass data meet theoretical expectationsArnaud-Haond, Sophie, Stoeckel, Solenn, and Bailleul, Diane https://doi.org/10.48550/arXiv.1902.10240Inferring rates of clonal versus sexual reproduction from population genetics dataRecommended by Olivier J Hardy based on reviews by Ludwig TRIEST, Stacy Krueger-Hadfield and 1 anonymous reviewerIn partially clonal organisms, genetic markers are often used to characterize the genotypic diversity of populations and infer thereof the relative importance of clonal versus sexual reproduction. Most studies report a measure of genotypic diversity based on a ratio, R, of the number of distinct multilocus genotypes over the sample size, and qualitatively interpret high / low R as indicating the prevalence of sexual / clonal reproduction. However, a theoretical framework allowing to quantify the relative rates of clonal versus sexual reproduction from genotypic diversity is still lacking, except using temporal sampling. Moreover, R is intrinsically highly dependent on sample size and sample design, while alternative measures of genotypic diversity are more robust to sample size, like D*, which is equivalent to the Gini-Simpson diversity index applied to multilocus genotypes. Another potential indicator of reproductive strategies is the inbreeding coefficient, Fis, because population genetics theory predicts that clonal reproduction should lead to negative Fis, at least when the sexual reproduction component occurs through random mating. Taking advantage of this prediction, Arnaud-Haond et al. [1] reanalysed genetic data from 165 populations of four partially clonal seagrass species sampled in a standardized way. They found positive correlations between Fis and both R and D* within each species, reflecting variation in the relative rates of sexual versus clonal reproduction among populations. Moreover, the differences of mean genotypic diversity and Fis values among species were also consistent with their known differences in reproductive strategies. Arnaud-Haond et al. [1] also conclude that previous works based on the interpretation of R generally lead to underestimate the prevalence of clonality in seagrasses. Arnaud-Haond et al. [1] confirm experimentally that Fis merits to be interpreted more properly than usually done when inferring rates of clonal reproduction from population genetics data of species reproducing both sexually and clonally. An advantage of Fis is that it is much less affected by sample size than R, and thus should be more reliable when comparing studies differing in sample design. Hence, when the rate of clonal reproduction becomes significant, we expect Fis < 0 and D* < 1. I expect these two indicators of clonality to be complementary because they rely on different consequences of clonality on pattern of genetic variation. Nevertheless, both measures can be affected by other factors. For example, null alleles, selfing or biparental inbreeding can pull Fis upwards, potentially eliminating the signature of clonal reproduction. Similarly, D* (and other measures of genotypic diversity) can be low because the polymorphism of the genetic markers used is too limited or because sexual reproduction often occurs through selfing, eventually resulting in highly similar homozygous genotypes. References [1] Arnaud-Haond, S., Stoeckel, S., and Bailleul, D. (2019). New insights into the population genetics of partially clonal organisms: when seagrass data meet theoretical expectations. ArXiv:1902.10240 [q-Bio], v6 peer-reviewed and recommended by Peer Community in Evolutionary Biology. Retrieved from http://arxiv.org/abs/1902.10240 | New insights into the population genetics of partially clonal organisms: when seagrass data meet theoretical expectations | Arnaud-Haond, Sophie, Stoeckel, Solenn, and Bailleul, Diane | <p>Seagrass meadows are among the most important coastal ecosystems, in terms of both spatial extent and ecosystem services, but they are also declining worldwide. Understanding the drivers of seagrass meadow dynamics is essential for designing so... | Evolutionary Ecology, Population Genetics / Genomics, Reproduction and Sex | Olivier J Hardy | 2019-03-01 21:57:34 | View |
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