Integrating phylogeography and paleoecology to investigate the origin and dynamics of hybrid zones: insights from two widespread<scp>N</scp>orth<scp>A</scp>merican firs

Cinget, Benjamin; Lafontaine, Guillaume de; Gérardi, Sébastien; Bousquet, Jean

doi:10.1111/mec.13194

Cited by 30 publications

(26 citation statements)

References 81 publications

(157 reference statements)

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“…In the case of invading species, the pattern of introgression at some neutral loci resulting from the range expansion of a species into an already occupied territory may mimic the effect of selection. Therefore, more studies of the contact zone dynamics (e.g., Cinget et al 2015) at Zieleniec reserve and its neighborhood are needed. Such studies would help to test invasion models and evaluate the role of demographic processes on the patterns of genomewide nucleotide sequence variation.…”

Section: Discussionmentioning

confidence: 99%

Hybridization in contact zone between temperate European pine species

Wachowiak

Żukowska

Wójkiewicz

et al. 2016

Tree Genetics & Genomes

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Hybridization studies are important to advance our understanding of the interspecific gene flow and its evolutionary consequences in closely related species. Hybridization and admixture patterns were assessed in a contact zone and reference populations of European pine species using sequence data from 26 nuclear genes and a species-diagnostic cpDNA marker. Reference populations formed three distinct genetic clusters comprising Pinus sylvestris, Pinus mugo/Pinus uliginosa, and Pinus uncinata. Evidence of population structure was found only in P. uliginosa. Based on phenotypic characteristics and molecular data, we identified five groups of individuals in the contact zone in Poland, comprising forms of the parental species and intermediates that were most probably the result of interspecific crosses. A combination of nuclear gene sequence data and a diagnostic organelle marker were used to show that hybridization is frequent in the contact zone and results in hybrid trees with distinct phenotypic identity. The influence of selection in maintaining hybrid phenotypes in environments unsuited to parental species was inferred from nucleotide polymorphism data. A lack of admixture in reference populations suggests that hybridization has not occurred during post-glacial migration and so the contact zone represents a distinct, active example of ongoing evolution. Pine populations in this zone will be a valuable system for studying the genetic basis of hybrid advantage in environmental conditions untypical of pure parental species.

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Section: Discussionmentioning

confidence: 99%

Hybridization in contact zone between temperate European pine species

Wachowiak

Żukowska

Wójkiewicz

et al. 2016

Tree Genetics & Genomes

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“…However some hybrid zones have remained remarkably stable in the face of climate change as appears to be the case for that between two North American firs, Abies balsamea and A. lasiocarpa . A genetic analysis of this hybrid zone indicates that it has not moved since it originated at the end of the last glacial period, approximately 11 kyr ago (Cinget et al, ).…”

Section: Occurrence and Nature Of Hybrid Zones: A Literature Surveymentioning

confidence: 99%

Plant speciation across environmental gradients and the occurrence and nature of hybrid zones

Abbott

2017

J of Sytematics Evolution

134

140

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Environmental gradients are very common and many plant species respond to them through adaptive genetic change. This can be a first step along a continuum of change that leads ultimately to the origin of fully reproductively isolated forms, i.e., 'biological species'. Before complete reproductive isolation is achieved, hybrid zones may form between divergent lineages either through primary intergradation or secondary contact. Here, I review the literature on plant hybrid zones between native species and highlight: mode of origin (primary intergradation versus secondary contact); distribution among plant families, genera and life form; type and genotypic composition related to strength and type of reproductive isolation between parental lineages; nature of prezygotic and postzygotic reproductive barriers; level and direction of gene flow; and the stability of hybrid zones in the face of climate change. The total number of plant hybrid zones detected in a literature search was surprisingly small (137). This was the case even for areas of the world with a long history of research into plant evolution, ecology and systematics. Reasons for this are discussed, including the possibility that plant hybrid zones are naturally rare in the wild. Only for a few hybrid zones have attempts been made to distinguish between formation by primary intergradation or secondary contact, and it is assumed that most hybrid zones originate through secondary contact. From the limited information available, it appears that plant hybrid zones may frequently move in response to climate change, but long-term studies are required to confirm this.

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“…; Cinget et al . ). However, such approaches assume that a species’ genome is a cohesive genetic unit isolated from other such units by reproductive barriers, albeit imperfectly for hybridizing species pairs (Coyne & Orr ).…”

Section: Introductionmentioning

confidence: 97%

Tracking the progression of speciation: variable patterns of introgression across the genome provide insights on the species delimitation between progenitor–derivative spruces (Picea mariana×P. rubens)

et al. 2015

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The genic species concept implies that while most of the genome can be exchanged somewhat freely between species through introgression, some genomic regions remain impermeable to interspecific gene flow. Hence, interspecific differences can be maintained despite ongoing gene exchange within contact zones. This study assessed the heterogeneous patterns of introgression at gene loci across the hybrid zone of an incipient progenitor-derivative species pair, Picea mariana (black spruce) and Picea rubens (red spruce). The spruce taxa likely diverged in geographic isolation during the Pleistocene and came into secondary contact during late Holocene. A total of 300 SNPs distributed across the 12 linkage groups (LG) of black spruce were genotyped for 385 individual trees from 33 populations distributed across the allopatric zone of each species and within the zone of sympatry. An integrative framework combining three population genomic approaches was used to scan the genomes, revealing heterogeneous patterns of introgression. A total of 23 SNPs scattered over 10 LG were considered impermeable to introgression and putatively under diverging selection. These loci revealed the existence of impermeable genomic regions forming the species boundary and are thus indicative of ongoing speciation between these two genetic lineages. Another 238 SNPs reflected selectively neutral diffusion across the porous species barrier. Finally, 39 highly permeable SNPs suggested ancestral polymorphism along with balancing selection. The heterogeneous patterns of introgression across the genome indicated that the speciation process between black spruce and red spruce is young and incomplete, albeit some interspecific differences are maintained, allowing ongoing species divergence even in sympatry. The approach developed in this study can be used to track the progression of ongoing speciation processes.

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Integrating phylogeography and paleoecology to investigate the origin and dynamics of hybrid zones: insights from two widespreadNorthAmerican firs

Cited by 30 publications

References 81 publications

Hybridization in contact zone between temperate European pine species

Hybridization in contact zone between temperate European pine species

Plant speciation across environmental gradients and the occurrence and nature of hybrid zones

Tracking the progression of speciation: variable patterns of introgression across the genome provide insights on the species delimitation between progenitor–derivative spruces (Picea mariana×P. rubens)

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