scholarly journals Analysis of Genome-Wide Differentiation between Native and Introduced Populations of the Cupped Oysters Crassostrea gigas and Crassostrea angulata

2018 ◽  
Vol 10 (9) ◽  
pp. 2518-2534 ◽  
Author(s):  
Pierre-Alexandre Gagnaire ◽  
Jean-Baptiste Lamy ◽  
Florence Cornette ◽  
Serge Heurtebise ◽  
Lionel Dégremont ◽  
...  
Keyword(s):  
Crassostrea Gigas ◽  
Introduced Populations ◽  
Genome Wide ◽  
Crassostrea Angulata

scholarly journals Analysis of genome-wide differentiation between native and introduced populations of the cupped oysters Crassostrea gigas and Crassostrea angulata

2018 ◽  
Author(s):  
Pierre-Alexandre Gagnaire ◽  
Jean-Baptiste Lamy ◽  
Florence Cornette ◽  
Serge Heurtebise ◽  
Lionel Dégremont ◽  
...  
Keyword(s):  
Gene Flow ◽  
Genetic Differentiation ◽  
Crassostrea Gigas ◽  
The North ◽  
Introduced Populations ◽  
Genome Wide ◽  
Crassostrea Angulata ◽  
The Pacific ◽  
Demographic Inference ◽  
Native And Introduced Ranges

AbstractThe Pacific cupped oyster is genetically subdivided into two sister taxa, Crassostrea gigas and C. angulata, which are in contact in the north-western Pacific. The nature and origin of their genetic and taxonomic differentiation remains controversial due the lack of known reproductive barriers and morphologic similarity. In particular, whether ecological and/or intrinsic isolating mechanisms participate to species divergence remains unknown. The recent co-introduction of both taxa into Europe offers a unique opportunity to test how genetic differentiation maintains under new environmental and demographic conditions. We generated a pseudo-chromosome assembly of the Pacific oyster genome using a combination of BAC-end sequencing and scaffold anchoring to a new high-density linkage map. We characterized genome-wide differentiation between C. angulata and C. gigas in both their native and introduced ranges, and showed that gene flow between species has been facilitated by their recent co-introductions in Europe. Nevertheless, patterns of genomic divergence between species remain highly similar in Asia and Europe, suggesting that the environmental transition caused by the co-introduction of the two species did not affect the genomic architecture of their partial reproductive isolation. Increased genetic differentiation was preferentially found in regions of low recombination. Using historical demographic inference, we show that the heterogeneity of differentiation across the genome is well explained by a scenario whereby recent gene flow has eroded past differentiation at different rates across the genome after a period of geographical isolation. Our results thus support the view that low-recombining regions help in maintaining intrinsic genetic differences between the two species.

scholarly journals Population genomic and historical analysis suggests a global invasion by bridgehead processes in Mimulus guttatus

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Mario Vallejo-Marín ◽  
Jannice Friedman ◽  
Alex D. Twyford ◽  
Olivier Lepais ◽  
Stefanie M. Ickert-Bond ◽  
...  
Keyword(s):  
Biological Invasions ◽  
Historical Analysis ◽  
Historical Records ◽  
British Isles ◽  
Mimulus Guttatus ◽  
Introduced Populations ◽  
Genome Wide ◽  
Starting Point ◽  
History Of ◽  
Global Invasion

AbstractImperfect historical records and complex demographic histories present challenges for reconstructing the history of biological invasions. Here, we combine historical records, extensive worldwide and genome-wide sampling, and demographic analyses to investigate the global invasion of Mimulus guttatus from North America to Europe and the Southwest Pacific. By sampling 521 plants from 158 native and introduced populations genotyped at >44,000 loci, we determined that invasive M. guttatus was first likely introduced to the British Isles from the Aleutian Islands (Alaska), followed by admixture from multiple parts of the native range. We hypothesise that populations in the British Isles then served as a bridgehead for vanguard invasions worldwide. Our results emphasise the highly admixed nature of introduced M. guttatus and demonstrate the potential of introduced populations to serve as sources of secondary admixture, producing novel hybrids. Unravelling the history of biological invasions provides a starting point to understand how invasive populations adapt to novel environments.

scholarly journals Impacts of the combined exposure to seawater acidification and arsenic on the proteome of Crassostrea angulata and Crassostrea gigas

2018 ◽  
Vol 203 ◽  
pp. 117-129 ◽  
Author(s):  
Anthony Moreira ◽  
Etelvina Figueira ◽  
Nélia C. Mestre ◽  
Denise Schrama ◽  
Amadeu M.V.M. Soares ◽  
...  
Keyword(s):  
Crassostrea Gigas ◽  
Combined Exposure ◽  
Seawater Acidification ◽  
Crassostrea Angulata

scholarly journals A Genome-Wide Association Study for Host Resistance to Ostreid Herpesvirus in Pacific Oysters (Crassostrea gigas)

2018 ◽  
Vol 8 (4) ◽  
pp. 1273-1280 ◽  
Author(s):  
Alejandro P. Gutierrez ◽  
Tim P. Bean ◽  
Chantelle Hooper ◽  
Craig A. Stenton ◽  
Matthew B. Sanders ◽  
...  
Keyword(s):  
Association Study ◽  
Host Resistance ◽  
Crassostrea Gigas ◽  
Genome Wide Association Study ◽  
Genome Wide Association ◽  
Pacific Oysters ◽  
Genome Wide ◽  
A Genome
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