Publications by authors named "B Guinand"
Steeper and sometimes extreme salinity gradients increasingly affect aquatic organisms because of climate change. Hypersalinity habitats demand powerful physiological adaptive strategies. Few teleost species have the capacity to spend their whole life cycle in salinities way over seawater levels.
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- Chromosomal inversions contribute to genetic diversity and reproductive isolation between evolutionary lineages, impacting speciation.
- In studying the long-snouted seahorse, researchers identified two significant chromosomal inversions that vary in frequency among different geographic lineages and ecotypes.
- These inversions are suggested to be ancient polymorphisms with one maintained through divergent selection and the other through pseudo-overdominance, revealing complex interactions influencing reproductive traits and evolutionary dynamics.
The association of molecular variants with phenotypic variation is a main issue in biology, often tackled with genome-wide association studies (GWAS). GWAS are challenging, with increasing, but still limited, use in evolutionary biology. We used redundancy analysis (RDA) as a complimentary ordination approach to single- and multitrait GWAS to explore the molecular basis of pigmentation variation in brown trout (Salmo trutta) belonging to wild populations impacted by hatchery fish.
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- - Viral nervous necrosis (VNN) is a serious disease affecting European sea bass caused by a specific virus (RGNNV), particularly impacting young fish in aquaculture settings.
- - To investigate genetic resistance to VNN, researchers tested 4,851 individuals from different year classes and identified relevant genetic markers through genome-wide association analysis, revealing important gene regions linked to disease resistance.
- - The study found that genetic information provided better predictions for breeding values (20-43% more accurate) compared to traditional pedigree methods, highlighting the potential for improved breeding strategies in aquaculture.
Background: In fish, minimally invasive blood sampling is widely used to monitor physiological stress with blood plasma biomarkers. As fish blood cells are nucleated, they might be a source a potential new markers derived from 'omics technologies. We modified the epiGBS (epiGenotyping By Sequencing) technique to explore changes in genome-wide cytosine methylation in the red blood cells (RBCs) of challenged European sea bass (Dicentrarchus labrax), a species widely studied in both natural and farmed environments.
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