Recent hybrid speciation at the origin of the narrow endemic<i>Pulmonaria helvetica</i>

Grünig, Sandra; Fischer, Markus; Parisod, Christian

doi:10.1093/aob/mcaa145

Cited by 19 publications

(19 citation statements)

References 53 publications

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“…Raw sequences were quality controlled with fastqc (https :// www.bioin forma tics.babra ham.ac.uk/proje cts/fastq c/) and processed with the ddocent pipeline (www.ddoce nt.com) following Grünig et al (2020). After demultiplexing and trimming with the process_radtag component of stacks v.1.26 (Catchen et al 2013), reads above 80% similarity were clustered using cd-hit to generate the reference catalogue of loci against which individual reads were mapped using bwa (Li and Durbin 2009).…”

Section: Reference Assembly and Snp Callingmentioning

confidence: 99%

Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps

et al. 2020

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Climatic oscillations of the Quaternary rapidly compelled plant species to shift their geographical range. How alpine plant species responded to climate change, however, remains elusive and remnants of the cold-adapted flora that currently strive in restricted ranges as small, isolated populations have been particularly overlooked. To address the evolutionary history of such a ‘glacial relict’, we here sampled and genotyped all known native populations of a narrow endemic species from the northwestern Alps, Papaver occidentale, as well as closely related taxa with double digest restriction-site Associated DNA (ddRAD) sequencing. Spatial patterns of genetic variation across populations coupled with insights from climatic niche modelling through time address underpinings of the long-term persistence of the species in face of climate changes. Evidence from population genetics and ecological modelling indicates that P. occidentale likely persisted through the last glacial maximum outside of the Western Prealps and that a major lineage recolonized the area from lower elevation, external regions. Differentiated lineages at the Northern margins of the species distribution range highlight highly divergent and geographically restricted populations that include considerable share of private markers and may indicate local glacial survival in isolated conditions. Our data thus imply that processes having shaped intraspecific spatial genetic structure within the Alps can be complex and lead to mosaic of populations with a mixed-history of local survival and immigration. A better understanding of spatio-temporal aspects of range contraction–expansion is crucial to shed light on processes underlying the evolution of remnant populations of such endemic species and set conservation priorities considering current climate changes.

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Section: Reference Assembly and Snp Callingmentioning

confidence: 99%

Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps

et al. 2020

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“…Speciation can give rise to a new species from a parental one that persists unchanged, especially through founder effects, but also through hybridization, or when some subpopulations develop traits that increase their biological fitness and allow a fast adaptation to a different niche [ 57 , 58 , 59 ]. In such cases, the new species is monophyletic, but still nested within the parental one, resulting in a paraphyletic taxon.…”

Section: Discussionmentioning

confidence: 99%

Species Delimitation and Conservation in Taxonomically Challenging Lineages: The Case of Two Clades of Capurodendron (Sapotaceae) in Madagascar

Boluda

Christe

Randriarisoa

et al. 2021

Plants

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Capurodendron is the largest endemic genus of plants from Madagascar, with around 76% of its species threatened by deforestation and illegal logging. However, some species are not well circumscribed and many of them remain undescribed, impeding a confident evaluation of their conservation status. Here we focus on taxa delimitation and conservation of two species complexes within Capurodendron: the Arid and Western complexes, each containing undescribed morphologies as well as intermediate specimens alongside well-delimited taxa. To solve these taxonomic issues, we studied 381 specimens morphologically and selected 85 of them to obtain intergenic, intronic, and exonic protein-coding sequences of 794 nuclear genes and 227 microsatellite loci. These data were used to test species limits and putative hybrid patterns using different approaches such as phylogenies, PCA, structure analyses, heterozygosity level, FST, and ABBA-BABA tests. The potential distributions were furthermore estimated for each inferred species. The results show that the Capurodendron Western Complex contains three well-delimited species, C. oblongifolium, C. perrieri, and C. pervillei, the first two hybridizing sporadically with the last and producing morphologies similar to, but genetically distinct from C. pervillei. The Arid Complex shows a more intricate situation, as it contains three species morphologically well-delimited but genetically intermixed. Capurodendron mikeorum nom. prov. is shown to be an undescribed species with a restricted distribution, while C. androyense and C. mandrarense have wider and mostly sympatric distributions. Each of the latter two species contains two major genetic pools, one showing interspecific admixture in areas where both taxa coexist, and the other being less admixed and comprising allopatric populations having fewer contacts with the other species. Only two specimens out of 172 showed clear genetic and morphological signals of recent hybridization, while all the others were morphologically well-delimited, independent of their degree of genetic admixture. Hybridization between Capurodendron androyense and C. microphyllum, the sister species of the Arid Complex, was additionally detected in areas where both species coexist, producing intermediate morphologies. Among the two complexes, species are well-defined morphologically with the exception of seven specimens (1.8%) displaying intermediate patterns and genetic signals compatible with a F1 hybridization. A provisional conservation assessment for each species is provided.

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“…However, such a scenario is by no means the rule. In Pulmonaria, molecular data identified a homoploid hybrid species in Switzerland that has likely evolved via chromosomal changes and dysploidy as reproductive barrier against the parents; other than in sunflowers, no ecological barriers were found [55]. In Sempervivum, ecogeographical displacement against the parents has been identified as major source for ongoing speciation of a hybrid zone between narrowly related species [56].…”

Section: Hybrid Speciation 21 Homoploid Hybridizationmentioning

confidence: 99%

Novel Approaches for Species Concepts and Delimitation in Polyploids and Hybrids

Hörandl

2022

Plants

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Hybridization and polyploidization are important processes for plant evolution. However, classification of hybrid or polyploid species has been notoriously difficult because of the complexity of processes and different evolutionary scenarios that do not fit with classical species concepts. Polyploid complexes are formed via combinations of allopolyploidy, autopolyploidy and homoploid hybridization with persisting sexual reproduction, resulting in many discrete lineages that have been classified as species. Polyploid complexes with facultative apomixis result in complicated net-work like clusters, or rarely in agamospecies. Various case studies illustrate the problems that apply to traditional species concepts to hybrids and polyploids. Conceptual progress can be made if lineage formation is accepted as an inevitable consequence of meiotic sex, which is established already in the first eukaryotes as a DNA restoration tool. The turnaround of the viewpoint that sex forms species as lineages helps to overcome traditional thinking of species as “units”. Lineage formation and self-sustainability is the prerequisite for speciation and can also be applied to hybrids and polyploids. Species delimitation is aided by the improved recognition of lineages via various novel -omics methods, by understanding meiosis functions, and by recognizing functional phenotypes by considering morphological-physiological-ecological adaptations.

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Recent hybrid speciation at the origin of the narrow endemicPulmonaria helvetica

Cited by 19 publications

References 53 publications

Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps

Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps

Species Delimitation and Conservation in Taxonomically Challenging Lineages: The Case of Two Clades of Capurodendron (Sapotaceae) in Madagascar

Novel Approaches for Species Concepts and Delimitation in Polyploids and Hybrids

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