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Journal articles on the topic 'Gene flow barrier'

Author: Grafiati

Published: 31 August 2024

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1

Tavares, Hugo, Annabel Whibley, David L. Field, et al. "Selection and gene flow shape genomic islands that control floral guides." Proceedings of the National Academy of Sciences 115, no. 43 (2018): 11006–11. http://dx.doi.org/10.1073/pnas.1801832115.

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Genomes of closely-related species or populations often display localized regions of enhanced relative sequence divergence, termed genomic islands. It has been proposed that these islands arise through selective sweeps and/or barriers to gene flow. Here, we genetically dissect a genomic island that controls flower color pattern differences between two subspecies of Antirrhinum majus, A.m.striatum and A.m.pseudomajus, and relate it to clinal variation across a natural hybrid zone. We show that selective sweeps likely raised relative divergence at two tightly-linked MYB-like transcription factor

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BARTON, N. H. "The effect of a barrier to gene flow on patterns of geographic variation." Genetics Research 90, no. 1 (2008): 139–49. http://dx.doi.org/10.1017/s0016672307009081.

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SummaryExplicit formulae are given for the effects of a barrier to gene flow on random fluctuations in allele frequency; these formulae can also be seen as generating functions for the distribution of coalescence times. The formulae are derived using a continuous diffusion approximation, which is accurate over all but very small spatial scales. The continuous approximation is confirmed by comparison with the exact solution to the stepping stone model. In both one and two spatial dimensions, the variance of fluctuations in allele frequencies increases near the barrier; when the barrier is very

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Joannon, B., C. Lavigne, H. Lecoq, and C. Desbiez. "Barriers to Gene Flow Between Emerging Populations of Watermelon mosaic virus in Southeastern France." Phytopathology® 100, no. 12 (2010): 1373–79. http://dx.doi.org/10.1094/phyto-04-10-0118.

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Since 1999, “emerging” (EM) strains of Watermelon mosaic virus (WMV) have been detected in cucurbit crops of southeastern France, probably as a result of recent introductions. Population genetic approaches were used to study the structure of EM isolates in southeastern France and to identify factors involved in their spatial distribution. A population clustering method (SAMOVA) and a maximum-difference algorithm (Monmonier's algorithm) were combined to visualize and quantify barriers to gene flow between populations. Both methods yielded similar results and two main barriers were identified. A

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Laetsch, Dominik R., Gertjan Bisschop, Simon H. Martin, Simon Aeschbacher, Derek Setter, and Konrad Lohse. "Demographically explicit scans for barriers to gene flow using gIMble." PLOS Genetics 19, no. 10 (2023): e1010999. http://dx.doi.org/10.1371/journal.pgen.1010999.

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Identifying regions of the genome that act as barriers to gene flow between recently diverged taxa has remained challenging given the many evolutionary forces that generate variation in genetic diversity and divergence along the genome, and the stochastic nature of this variation. Progress has been impeded by a conceptual and methodological divide between analyses that infer the demographic history of speciation and genome scans aimed at identifying locally maladaptive alleles i.e. genomic barriers to gene flow. Here we implement genomewide IM blockwise likelihood estimation (gIMble), a compos

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de Abreu Moreira, Patrícia, and G. Wilson Fernandes. "Is the São Francisco River a geographic barrier to gene flow in trees of Handroanthus ochraceus?" Journal of Tropical Ecology 29, no. 3 (2013): 243–50. http://dx.doi.org/10.1017/s0266467413000217.

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Abstract:Many landscape features represent geographic barriers to gene flow, and promote genetic discontinuity. Rivers are effective barriers. However, most studies on this subject have focused on animals and only a few have focused on plants. We studied the genetic structure and gene flow of the tropical tree Handroanthus ochraceus (Bignoniaceae) on both banks of the São Francisco River in a Brazilian seasonally dry tropical forest. The São Francisco is located in eastern Brazil and is 600 m wide at the study site. Our hypothesis was that the river is a geographic barrier to gene flow of H. o

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6

Hu, Xin-Sheng. "Mating system as a barrier to gene flow." Evolution 69, no. 5 (2015): 1158–77. http://dx.doi.org/10.1111/evo.12660.

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7

Gross, Liza. "Autoimmunity: A Barrier to Gene Flow in Plants?" PLoS Biology 5, no. 9 (2007): e262. http://dx.doi.org/10.1371/journal.pbio.0050262.

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Lessios, H. A. "A sea water barrier to coral gene flow." Molecular Ecology 21, no. 22 (2012): 5390–92. http://dx.doi.org/10.1111/mec.12037.

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Gayden, Tenzin, Annabel Perez, Patrice J. Persad, et al. "The Himalayas: Barrier and conduit for gene flow." American Journal of Physical Anthropology 151, no. 2 (2013): 169–82. http://dx.doi.org/10.1002/ajpa.22240.

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Christmas, Matthew J., Julia C. Jones, Anna Olsson, et al. "Genetic Barriers to Historical Gene Flow between Cryptic Species of Alpine Bumblebees Revealed by Comparative Population Genomics." Molecular Biology and Evolution 38, no. 8 (2021): 3126–43. http://dx.doi.org/10.1093/molbev/msab086.

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Abstract Evidence is accumulating that gene flow commonly occurs between recently diverged species, despite the existence of barriers to gene flow in their genomes. However, we still know little about what regions of the genome become barriers to gene flow and how such barriers form. Here, we compare genetic differentiation across the genomes of bumblebee species living in sympatry and allopatry to reveal the potential impact of gene flow during species divergence and uncover genetic barrier loci. We first compared the genomes of the alpine bumblebee Bombus sylvicola and a previously unidentif

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Gayden, Tenzin, Alicia M. Cadenas, Maria Regueiro, et al. "The Himalayas as a Directional Barrier to Gene Flow." American Journal of Human Genetics 80, no. 5 (2007): 884–94. http://dx.doi.org/10.1086/516757.

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12

Evans, Ben J., Anthony J. Tosi, Kai Zeng, Jonathan Dushoff, André Corvelo, and Don J. Melnick. "Speciation over the edge: gene flow among non-human primate species across a formidable biogeographic barrier." Royal Society Open Science 4, no. 10 (2017): 170351. http://dx.doi.org/10.1098/rsos.170351.

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Many genera of terrestrial vertebrates diversified exclusively on one or the other side of Wallace’s Line, which lies between Borneo and Sulawesi islands in Southeast Asia, and demarcates one of the sharpest biogeographic transition zones in the world. Macaque monkeys are unusual among vertebrate genera in that they are distributed on both sides of Wallace‘s Line, raising the question of whether dispersal across this barrier was an evolutionary one-off or a more protracted exchange—and if the latter, what were the genomic consequences. To explore the nature of speciation over the edge of this

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Blanckaert, Alexandre, Claudia Bank, and Joachim Hermisson. "The limits to parapatric speciation 3: evolution of strong reproductive isolation in presence of gene flow despite limited ecological differentiation." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1806 (2020): 20190532. http://dx.doi.org/10.1098/rstb.2019.0532.

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Gene flow tends to impede the accumulation of genetic divergence. Here, we determine the limits for the evolution of postzygotic reproductive isolation in a model of two populations that are connected by gene flow. We consider two selective mechanisms for the creation and maintenance of a genetic barrier: local adaptation leads to divergence among incipient species due to selection against migrants, and Dobzhansky–Muller incompatibilities (DMIs) reinforce the genetic barrier through selection against hybrids. In particular, we are interested in the maximum strength of the barrier under a limit

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14

Lee, Tristan, Kyall R. Zenger, Robert L. Close, Marilyn Jones, and David N. Phalen. "Defining spatial genetic structure and management units for vulnerable koala (Phascolarctos cinereus) populations in the Sydney region, Australia." Wildlife Research 37, no. 2 (2010): 156. http://dx.doi.org/10.1071/wr09134.

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Context. Mammal populations around the world are increasingly threatened with population fragmentation because of loss of habitat or barriers to gene flow. The investigation of koala populations in the Sydney region not only provides valuable information about this vulnerable species, but also serves as a model for other species that have suffered major rapid declines in population size, and are now recovering in fragmented habitat. The peri-urban study region allows investigation of the impact of landscape features such as major roads and housing developments on koala gene flow. Aims. Animals

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Su, H., L.-J. Qu, K. He, et al. "The Great Wall of China: a physical barrier to gene flow?" Heredity 90, no. 3 (2003): 212–19. http://dx.doi.org/10.1038/sj.hdy.6800237.

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Lessios, H. A., B. D. Kessing, and D. R. Robertson. "Massive gene flow across the world's most potent marine biogeographic barrier." Proceedings of the Royal Society of London. Series B: Biological Sciences 265, no. 1396 (1998): 583–88. http://dx.doi.org/10.1098/rspb.1998.0334.

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Lessios, H. A., and D. R. Robertson. "Crossing the impassable: genetic connections in 20 reef fishes across the eastern Pacific barrier." Proceedings of the Royal Society B: Biological Sciences 273, no. 1598 (2006): 2201–8. http://dx.doi.org/10.1098/rspb.2006.3543.

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The ‘impassable’ Eastern Pacific Barrier (EPB), ca 5000 km of deep water separating the eastern from the central Pacific, is the World's widest marine biogeographic barrier. Sequencing of mitochondrial DNA in 20 reef fish morphospecies encountered on both sides of the barrier revealed cryptic speciation in two. Among the other 18 species only two showed significant differentiation (as revealed by haplotype networks and F ST statistics) between the eastern and the central Pacific. Coalescence analyses indicated that genetic similarity in the 18 truly transpacific species resulted from different

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Glass, Jessica R., Scott R. Santos, John SK Kauwe, and Brandon D. Pickett. "Phylogeography of two marine predators, giant trevally (Caranx ignobilis) and bluefin trevally (Caranx melampygus), across the Indo-Pacific." Bulletin of Marine Science 97, no. 2 (2021): 257–80. http://dx.doi.org/10.5343/bms.2019.0114.

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For economically valuable marine fishes, identifying biogeographic barriers and estimating the extent of gene flow are critical components of fisheries management. We examined the population genetic structure of two commercially important reef-associated predators, the giant trevally ( Caranx ignobilis) and bluefin trevally (Caranx melampygus). We sampled 225 individuals and 32,798 single nucleotide polymorphisms (SNPs) of C. ignobilis, and 74 individuals and 43,299 SNPs of C. melampygus. Analyses of geographic population structure indicate the two species display subtly different phylogeograp

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Sun, Zhonglou, Tao Pan, Hui Wang, Mujia Pang, and Baowei Zhang. "Yangtze River, an insignificant genetic boundary in tufted deer (Elaphodus cephalophus): the evidence from a first population genetics study." PeerJ 4 (November 8, 2016): e2654. http://dx.doi.org/10.7717/peerj.2654.

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Great rivers were generally looked at as the geographical barrier to gene flow for many taxonomic groups. The Yangtze River is the third largest river in the world, and flows across South China and into the East China Sea. Up until now, few studies have been carried out to evaluate its effect as a geographical barrier. In this study, we attempted to determine the barrier effect of the Yangtze River on the tufted deer (Elaphodus cephalophus) using the molecular ecology approach. Using mitochondrial DNA control region (CR) sequences and 13 nuclear microsatellite loci, we explored the genetic str

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Agrawal, Aneil F., Jeffrey L. Feder, and Patrik Nosil. "Ecological Divergence and the Origins of Intrinsic Postmating Isolation with Gene Flow." International Journal of Ecology 2011 (2011): 1–15. http://dx.doi.org/10.1155/2011/435357.

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The evolution of intrinsic postmating isolation has received much attention, both historically and in recent studies of speciation genes. Intrinsic isolation often stems from between-locus genetic incompatibilities, where alleles that function well within species are incompatible with one another when brought together in the genome of a hybrid. It can be difficult for such incompatibilities to originate when populations diverge with gene flow, because deleterious genotypic combinations will be created and then purged by selection. However, it has been argued that if genes underlying incompatib

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Lanna, Flávia M., Marcelo Gehara, Fernanda P. Werneck, et al. "Dwarf geckos and giant rivers: the role of the São Francisco River in the evolution of Lygodactylus klugei (Squamata: Gekkonidae) in the semi-arid Caatinga of north-eastern Brazil." Biological Journal of the Linnean Society 129, no. 1 (2019): 88–98. http://dx.doi.org/10.1093/biolinnean/blz170.

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Abstract Species diversification can be strongly influenced by geomorphological features, such as mountains, valleys and rivers. Rivers can act as hard or soft barriers to gene flow depending on their size, speed of flow, historical dynamics and regional topographical characteristics. The São Francisco River (SFR) is the largest perennial river in the Caatinga biome in north-eastern Brazil and has been considered a barrier to gene flow and dispersal. Herein, we evaluated the role of the SFR on the evolution of Lygodactylus klugei, a small gecko from the Caatinga. Using a single-locus species d

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22

Bomblies, Kirsten, and Detlef Weigel. "Hybrid necrosis: autoimmunity as a potential gene-flow barrier in plant species." Nature Reviews Genetics 8, no. 5 (2007): 382–93. http://dx.doi.org/10.1038/nrg2082.

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23

Bialozyt, Ronald, Marc Niggemann, and Birgit Ziegenhagen. "Quantification of the zygotic barrier between interbreeding taxa using gene flow data." Oikos 126, no. 7 (2016): 948–58. http://dx.doi.org/10.1111/oik.03428.

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24

Vikas, V. K., S. M. S. Tomar, M. Sivasamy, et al. "Hybrid necrosis in wheat: evolutionary significance or potential barrier for gene flow?" Euphytica 194, no. 2 (2013): 261–75. http://dx.doi.org/10.1007/s10681-013-0952-9.

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25

Nagasawa, Koki, Hiroaki Setoguchi, Masayuki Maki, Kazuhiro Sawa, Kenji Horie, and Shota Sakaguchi. "Species cohesion of an extremophyte (Carex angustisquama, Cyperaceae) in solfatara fields maintained under interspecific natural hybridization." Annals of Botany 128, no. 3 (2021): 343–56. http://dx.doi.org/10.1093/aob/mcab069.

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Abstract Background and Aims Hybridization is the main driver of plant diversification, and gene flow via hybridization has multifaceted effects on plant evolution. Carex angustisquama is an extremophyte that grows on soils heavily acidified by volcanism. Despite its habitat distinct from that of other species, this species is known to form interspecific hybrids, implying interspecific gene flow. It is crucial to verify the extent and direction of interspecific gene flow between C. angustisquama and closely related species to understand the evolutionary process of an extremophyte in solfatara

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Regilme, Maria Angenica F., Thaddeus M. Carvajal, Ann–Christin Honnen, Divina M. Amalin, and Kozo Watanabe. "The influence of roads on the fine-scale population genetic structure of the dengue vector Aedes aegypti (Linnaeus)." PLOS Neglected Tropical Diseases 15, no. 2 (2021): e0009139. http://dx.doi.org/10.1371/journal.pntd.0009139.

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Dengue is endemic in tropical and subtropical countries and is transmitted mainly by Aedes aegypti. Mosquito movement can be affected by human-made structures such as roads that can act as a barrier. Roads can influence the population genetic structure of Ae. aegypti. We investigated the genetic structure and gene flow of Ae. aegypti as influenced by a primary road, España Boulevard (EB) with 2000-meter-long stretch and 24-meters-wide in a very fine spatial scale. We hypothesized that Ae. aegypti populations separated by EB will be different due to the limited gene flow as caused by the barrie

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Arenas, Sebastián, Alberto Búrquez, Enriquena Bustamante, Enrique Scheinvar, and Luis E. Eguiarte. "Are 150 km of open sea enough? Gene flow and population differentiation in a bat-pollinated columnar cactus." PLOS ONE 18, no. 6 (2023): e0282932. http://dx.doi.org/10.1371/journal.pone.0282932.

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Genetic differentiations and phylogeographical patterns are controlled by the interplay between spatial isolation and gene flow. To assess the extent of gene flow across an oceanic barrier, we explored the effect of the separation of the peninsula of Baja California on the evolution of mainland and peninsular populations of the long-lived columnar cactus Stenocereus thurberi. We analyzed twelve populations throughout the OPC distribution range to assess genetic diversity and structure using chloroplast DNA sequences. Genetic diversity was higher (Hd = 0.81), and genetic structure was lower (GS

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Piálek, Jaroslav, and Nick H. Barton. "The Spread of an Advantageous Allele Across a Barrier: The Effects of Random Drift and Selection Against Heterozygotes." Genetics 145, no. 2 (1997): 493–504. http://dx.doi.org/10.1093/genetics/145.2.493.

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A local barrier to gene flow will delay the spread of an advantageous allele. Exact calculations for the deterministic case show that an allele that is favorable when rare is delayed very little even by a strong barrier: its spread is slowed by a time proportional to log((B/σ)√2S)/S, where B is the barrier strength, σ the dispersal range, and fitnesses are 1:1 + S:1 + 2S. However,when there is selection against heterozygotes, such that the allele cannot increase from low frequency, a barrier can cause a much greater delay. If gene flow is reduced below a critical value, spread is entirely prev

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Mohan, Ashwini Venkatanarayana, Priyanka Swamy, and Kartik Shanker. "Population structure in the Andaman keelback, Xenochrophis tytleri: geographical distance and oceanic barriers to dispersal influence genetic divergence on the Andaman archipelago." PeerJ 6 (October 9, 2018): e5752. http://dx.doi.org/10.7717/peerj.5752.

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Limited gene flow between populations due to geographic distance, presence of barriers or inherent low dispersal ability leads to the formation of genetically structured populations. Strong population structure indicates lowered levels or absence of gene flow which might lead to inbreeding and loss of genetic capacity to recuperate from anthropogenic stress and natural calamities. Terrestrial reptiles are generally known to have low dispersal abilities and few studies have explored drivers of their population structure on continental islands, where both anthropogenic stress and natural calamit

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He, Ziwen, Xinnian Li, Ming Yang, et al. "Speciation with gene flow via cycles of isolation and migration: insights from multiple mangrove taxa." National Science Review 6, no. 2 (2018): 275–88. http://dx.doi.org/10.1093/nsr/nwy078.

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AbstractAllopatric speciation requiring an unbroken period of geographical isolation has been the standard model of neo-Darwinism. While doubts have been repeatedly raised, strict allopatry without any gene flow remains a plausible mechanism in most cases. To rigorously reject strict allopatry, genomic sequences superimposed on the geological records of a well-delineated geographical barrier are necessary. The Strait of Malacca, narrowly connecting the Pacific and Indian Ocean coasts, serves at different times either as a geographical barrier or a conduit of gene flow for coastal/marine specie

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BARTON, N. H., and M. SHPAK. "The effect of epistasis on the structure of hybrid zones." Genetical Research 75, no. 2 (2000): 179–98. http://dx.doi.org/10.1017/s0016672399004334.

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Within hybrid zones that are maintained by a balance between selection and dispersal, linkage disequilibrium is generated by the mixing of divergent populations. This linkage disequilibrium causes selection on each locus to act on all other loci, thereby steepening clines, and generating a barrier to gene flow. Diffusion models predict simple relations between the strength of linkage disequilibrium and the dispersal rate, σ, and between the barrier to gene flow, B, and the reduction in mean fitness, W¯. The aim of this paper is to test the accuracy of these predictions by comparison with an ex

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Johannesson, Kerstin, Zuzanna Zagrodzka, Rui Faria, Anja Marie Westram, and Roger K. Butlin. "Is embryo abortion a post‐zygotic barrier to gene flow between Littorina ecotypes?" Journal of Evolutionary Biology 33, no. 3 (2019): 342–51. http://dx.doi.org/10.1111/jeb.13570.

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Marsh, D. M., R. B. Page, T. J. Hanlon, et al. "Ecological and genetic evidence that low-order streams inhibit dispersal by red-backed salamanders (Plethodon cinereus)." Canadian Journal of Zoology 85, no. 3 (2007): 319–27. http://dx.doi.org/10.1139/z07-008.

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While many studies have examined the barrier effects of large rivers on animal dispersal and gene flow, few studies have considered the barrier effects of small streams. We used displacement experiments and analyses of genetic population structure to examine the effects of first-order and second-order streams on the dispersal of terrestrial red-backed salamanders, Plethodon cinereus (Green, 1818). We marked red-backed salamanders from near the edges of one first-order stream and one second-order stream, and experimentally displaced them either across the stream or an equal distance farther int

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Skroblin, Anja, Robert Lanfear, Andrew Cockburn, and Sarah Legge. "Inferring population connectivity across the range of the purple-crowned fairy-wren (Malurus coronatus) from mitochondrial DNA and morphology: implications for conservation management." Australian Journal of Zoology 60, no. 3 (2012): 199. http://dx.doi.org/10.1071/zo12093.

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Knowledge of population structure and patterns of connectivity is required to implement effective conservation measures for the purple-crowned fairy-wren (Malurus coronatus), a threatened endemic of northern Australia. This study aimed to identify barriers to dispersal across the distribution of M. coronatus, investigate the impact that the recent declines may have on population connectivity, and propose conservation actions to maintain natural patterns of gene flow. Analysis of mitochondrial DNA sequences from 87 M. coronatus identified two phylogenetic clusters that corresponded with the phe

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Knight, James T., Catherine J. Nock, Martin S. Elphinstone, and Peter R. Baverstock. "Conservation implications of distinct genetic structuring in the endangered freshwater fish Nannoperca oxleyana (Percichthyidae)." Marine and Freshwater Research 60, no. 1 (2009): 34. http://dx.doi.org/10.1071/mf08022.

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The maintenance of genetic diversity and gene flow in threatened species is a vital consideration for recovery programs. The endangered Oxleyan pygmy perch Nannoperca oxleyana has a fragmented distribution within coastal freshwater drainages of southern Queensland and northern New South Wales, Australia. In the present study, mitochondrial DNA control region variation was used to assess genetic diversity and structure across the geographical range of this species. Haplotypic diversity was highest in a small NSW subcatchment south of Evans Head (h = 0.594) followed by Marcus Creek in Queensland

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Curley, Colleen T., Brian P. Mead, Karina Negron, et al. "Augmentation of brain tumor interstitial flow via focused ultrasound promotes brain-penetrating nanoparticle dispersion and transfection." Science Advances 6, no. 18 (2020): eaay1344. http://dx.doi.org/10.1126/sciadv.aay1344.

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The delivery of systemically administered gene therapies to brain tumors is exceptionally difficult because of the blood-brain barrier (BBB) and blood-tumor barrier (BTB). In addition, the adhesive and nanoporous tumor extracellular matrix hinders therapeutic dispersion. We first developed the use of magnetic resonance image (MRI)–guided focused ultrasound (FUS) and microbubbles as a platform approach for transfecting brain tumors by targeting the delivery of systemically administered “brain-penetrating” nanoparticle (BPN) gene vectors across the BTB/BBB. Next, using an MRI-based transport ana

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Richmond, Jonathan Q., and Elizabeth L. Jockusch. "Body size evolution simultaneously creates and collapses species boundaries in a clade of scincid lizards." Proceedings of the Royal Society B: Biological Sciences 274, no. 1619 (2007): 1701–8. http://dx.doi.org/10.1098/rspb.2007.0364.

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Speciation is generally viewed as an irreversible process, although habitat alterations can erase reproductive barriers if divergence between ecologically differentiated species is recent. Reversed speciation might also occur if geographical contact is established between species that have evolved the same reproductive isolating barrier in parallel. Here, we demonstrate a loss of intrinsic reproductive isolation in a clade of scincid lizards as a result of parallel body size evolution, which has allowed for gene flow where large-bodied lineages are in secondary contact. An mtDNA phylogeny conf

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BIERNE, NICOLAS, THOMAS LENORMAND, FRANÇOIS BONHOMME, and PATRICE DAVID. "Deleterious mutations in a hybrid zone: can mutational load decrease the barrier to gene flow?" Genetical Research 80, no. 3 (2002): 197–204. http://dx.doi.org/10.1017/s001667230200592x.

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The aim of this paper is to investigate the effect of deleterious mutations in a hybrid zone maintained by selection against hybrids. In such zones, linkage disequilibria among hybrid depression loci, resulting from a balance between migration and selection, are crucial in maintaining the barrier because they allow each locus, in addition to its own selection coefficient, to cumulate indirect selective effects from other loci. Deleterious alleles produce heterosis and increase by this means the effective migration rate in structured populations. In a hybrid zone, they therefore contribute to d

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Rieseberg, Loren H., Jeannette Whitton, and Keith Gardner. "Hybrid Zones and the Genetic Architecture of a Barrier to Gene Flow Between Two Sunflower Species." Genetics 152, no. 2 (1999): 713–27. http://dx.doi.org/10.1093/genetics/152.2.713.

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Abstract Genetic analyses of reproductive barriers represent one of the few methods by which theories of speciation can be tested. However, genetic study is often restricted to model organisms that have short generation times and are easily propagated in the laboratory. Replicate hybrid zones with a diversity of recombinant genotypes of varying age offer increased resolution for genetic mapping experiments and expand the pool of organisms amenable to genetic study. Using 88 markers distributed across 17 chromosomes, we analyze the introgression of chromosomal segments of Helianthus petiolaris

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Cowman, Peter F., and David R. Bellwood. "Vicariance across major marine biogeographic barriers: temporal concordance and the relative intensity of hard versus soft barriers." Proceedings of the Royal Society B: Biological Sciences 280, no. 1768 (2013): 20131541. http://dx.doi.org/10.1098/rspb.2013.1541.

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The marine tropics contain five major biogeographic regions (East Pacific, Atlantic, Indian Ocean, Indo-Australian Archipelago (IAA) and Central Pacific). These regions are separated by both hard and soft barriers. Reconstructing ancestral vicariance, we evaluate the extent of temporal concordance in vicariance events across three major barriers (Terminal Tethyan Event (TTE), Isthmus of Panama (IOP), East Pacific Barrier, EPB) and two incomplete barriers (either side of the IAA) for the Labridae, Pomacentridae and Chaetodontidae. We found a marked lack of temporal congruence within and among t

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Loretán, Gisela, Eva Carolina Rueda, Juan Manuel Cabrera, Marcos Pérez-Losada, Pablo Agustín Collins, and Federico Giri. "Geographical isolation and restricted gene flow drive speciation of Aegla singularis (Decapoda: Anomura: Aeglidae) in southern South America." Biological Journal of the Linnean Society 129, no. 1 (2019): 177–89. http://dx.doi.org/10.1093/biolinnean/blz148.

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Abstract Geographical isolation is a key element in allopatric speciation. If gene flow is interrupted for long enough by geographical barriers, populations can evolve independently and eventually form distinct species. Aegla singularis provides an ideal model to study this process due to the characteristics of the geographical area that it occupies and its limited dispersal ability. Aegla singularis inhabits streams of the Uruguay and Paraná River basins in the Neotropical region of South America. The basins are separated by the Sierra Central Mountains. Here we studied the speciation of A. s

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Whitton, Jeannette, Katrina M. Dlugosch, and Christopher J. Sears. "Molecular and morphological evidence for and against gene flow in sympatric apomicts of the North American Crepis agamic complex (Asteraceae)This paper is one of a selection of papers published in the Special Issue on Systematics Research." Botany 86, no. 8 (2008): 877–85. http://dx.doi.org/10.1139/b08-071.

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The study of sympatric populations of closely related plant species often reveals evidence of hybridization. Mechanisms that reduce outcrossing (e.g., selfing, apomixis) may allow co-occurrence without gene flow. In this study, we describe patterns of genetic variation in two contact zones, each comprising three closely related morphological types, that key to three distinct species in the North American Crepis agamic (apomictic) complex. We used RAPD markers to characterize individuals from two sites: one in northern California (Sardine Lookout) and another in northwestern Oregon (Summit Road

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Manawaduge, Chapa G., Anthony R. Clarke, and David A. Hurwood. "Divergent east-west lineages in an Australian fruit fly, (Bactrocera jarvisi), associated with the Carpentaria Basin divide." PLOS ONE 18, no. 6 (2023): e0276247. http://dx.doi.org/10.1371/journal.pone.0276247.

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Bactrocera jarvisi is an endemic Australian fruit fly species (Diptera: Tephritidae). It occurs commonly across tropical and subtropical coastal Australia, from far-northern Western Australia, across the ‘Top End’ of the Northern Territory, and then down the Queensland east coast. Across this range, its distribution crosses several well documented biogeographic barriers. In order to better understand factors leading to the divergence of Australian fruit fly lineages, we carried out a population genetic study of B. jarvisi from across its range using genome-wide SNP analysis, utilising adult sp

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Richards, Thomas J., and Daniel Ortiz-Barrientos. "Immigrant inviability produces a strong barrier to gene flow between parapatric ecotypes ofSenecio lautus." Evolution 70, no. 6 (2016): 1239–48. http://dx.doi.org/10.1111/evo.12936.

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Baums, Iliana B., Jennifer N. Boulay, Nicholas R. Polato, and Michael E. Hellberg. "No gene flow across the Eastern Pacific Barrier in the reef-building coralPorites lobata." Molecular Ecology 21, no. 22 (2012): 5418–33. http://dx.doi.org/10.1111/j.1365-294x.2012.05733.x.

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Sá-Pinto, A., M. Martínez-Fernández, C. López-Fernández, et al. "Incipient post-zygotic barrier in a model system of ecological speciation with gene flow." Journal of Evolutionary Biology 26, no. 12 (2013): 2750–56. http://dx.doi.org/10.1111/jeb.12269.

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Liu, Yongbo, Fajun Chen, Xiao Guan, and Junsheng Li. "High crop barrier reduces gene flow from transgenic to conventional maize in large fields." European Journal of Agronomy 71 (November 2015): 135–40. http://dx.doi.org/10.1016/j.eja.2015.09.005.

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Santa-Maria, Ana R., Fruzsina R. Walter, Ricardo Figueiredo, et al. "Flow induces barrier and glycocalyx-related genes and negative surface charge in a lab-on-a-chip human blood-brain barrier model." Journal of Cerebral Blood Flow & Metabolism 41, no. 9 (2021): 2201–15. http://dx.doi.org/10.1177/0271678x21992638.

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Microfluidic lab-on-a-chip (LOC) devices allow the study of blood-brain barrier (BBB) properties in dynamic conditions. We studied a BBB model, consisting of human endothelial cells derived from hematopoietic stem cells in co-culture with brain pericytes, in an LOC device to study fluid flow in the regulation of endothelial, BBB and glycocalyx-related genes and surface charge. The highly negatively charged endothelial surface glycocalyx functions as mechano-sensor detecting shear forces generated by blood flow on the luminal side of brain endothelial cells and contributes to the physical barri

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Viard, Frédérique, Cynthia Riginos, and Nicolas Bierne. "Anthropogenic hybridization at sea: three evolutionary questions relevant to invasive species management." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1806 (2020): 20190547. http://dx.doi.org/10.1098/rstb.2019.0547.

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Species introductions promote secondary contacts between taxa with long histories of allopatric divergence. Anthropogenic contact zones thus offer valuable contrasts to speciation studies in natural systems where past spatial isolations may have been brief or intermittent. Investigations of anthropogenic hybridization are rare for marine animals, which have high fecundity and high dispersal ability, characteristics that contrast to most terrestrial animals. Genomic studies indicate that gene flow can still occur after millions of years of divergence, as illustrated by invasive mussels and tuni

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Santos, Ronaldo Pereira, Paula Cristina da Silva Ângelo, Paulo de Tarso Barbosa Sampaio, Regina Caetano Quisen, Ângela Maria Conte Leite, and Cristiane Lopes de Oliveira. "Geographic pattern of genetic diversity in natural populations of Rosewood (Aniba rosaeodora), in the Central Amazonia." Acta Amazonica 38, no. 3 (2008): 459–66. http://dx.doi.org/10.1590/s0044-59672008000300010.

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Rosewood (Aniba rosaeodora Ducke, Lauraceae) is an Amazonian evergreen tree and a source of the purest linalool, the main component of its essential oil, which is very valuable in the international perfumery market. After decades of over-exploitation it is currently considered as threatened. We evaluated the genetic diversity and its distribution in four populations in Central Amazonia. Thirty-five reliable RAPD markers were generated, of which 32 were polymorphic (91.4%). Variation was higher within the populations (76.5%; p < 0.0001) and geographic distribution contributed to population d

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