A5038828678- Genetic diversity and population structure
- Fish Ecology and Management Studies
- Identification and Quantification in Food
- Genetic and phenotypic traits in livestock
- Marine and fisheries research
- Environmental DNA in Biodiversity Studies
- Aquaculture Nutrition and Growth
- Fish Biology and Ecology Studies
- Marine Bivalve and Aquaculture Studies
- Animal Behavior and Reproduction
- Genetic Mapping and Diversity in Plants and Animals
- Microbial Community Ecology and Physiology
- Reproductive biology and impacts on aquatic species
- Genomics and Phylogenetic Studies
- Physiological and biochemical adaptations
- Aquatic Invertebrate Ecology and Behavior
- Aquaculture disease management and microbiota
- Coastal and Marine Management
- Marine animal studies overview
- Evolution and Genetic Dynamics
- Insect and Arachnid Ecology and Behavior
- Isotope Analysis in Ecology
- Insect and Pesticide Research
- Plant and animal studies
- Marine Ecology and Invasive Species
Technical University of Denmark
2015-2024
Linnaeus University
2020
Health Canada
2012
Aarhus University
1998-2004
The marine environment is characterized by few physical barriers, and pelagic fishes commonly show high migratory potential low, albeit in some cases statistically significant, levels of genetic divergence neutral marker analyses. However, it not clear whether low differentiation reflect spatially separated populations experiencing gene flow or shallow population histories coupled with limited random drift large, demographically isolated undergoing independent evolutionary processes. Using...
Illegal, Unreported and Unregulated fishing has had a major role in the overexploitation of global fish populations. In response, international regulations have been imposed many fisheries 'eco-certified' by consumer organizations, but methods for independent control catch certificates eco-labels are urgently needed. Here we show that, using gene-associated single nucleotide polymorphisms, individual marine can be assigned back to population origin with unprecedented high levels precision....
Abstract High gene flow is considered the norm for most marine organisms and expected to limit their ability adapt local environments. Few studies have directly compared patterns of differentiation at neutral selected loci in organisms. We analysed a transcriptome‐derived panel 281 SNPs Atlantic herring ( Clupea harengus ), highly migratory small pelagic fish, elucidating genetic variation among populations identify candidate genes environmental adaptation. 607 individuals from 18 spawning...
Abstract Application of environmental DNA (e ) analysis has attracted the attention researchers, advisors and managers living marine resources biodiversity. The apparent simplicity cost‐effectiveness e make it highly attractive as species distributions can be revealed from water samples. Further, species‐specific analyses indicate that concentrations correlate with biomass abundance, suggesting possibility for quantitative applications estimating abundance specific organisms in ecosystems,...
The spatial structuring of intraspecific genetic diversity is the result random drift, natural selection, migration, mutation, and their interaction with historical processes. contribution each has been typically difficult to estimate, but recent advances in statistical genetics have provided valuable new investigative tools tackle such complexity. Using a combination methods, we examined roles environment (i.e., selection), processes drift), demography life histories (e.g., feeding...
The existence of biologically differentiated populations has been credited with a major role in conferring sustainability and buffering overall productivity anadromous fish population complexes where evidence for spatial structure is uncontroversial. Here, we describe correlated genetic life history (spawning season linked to spawning location) differentiation an abundant highly migratory pelagic fish, Atlantic herring, Clupea harengus, the North Sea (NS) adjacent areas. genetically...
Abstract Numerically small but statistically significant genetic differentiation has been found in many marine fish species despite very large census population sizes and absence of obvious barriers to migrating individuals. Analyses morphological traits have previously identified local spawning groups herring ( Clupea harengus L.) the environmentally heterogeneous Baltic Sea, whereas allozyme markers not revealed differentiation. We analysed variation at nine microsatellite loci 24 samples...
Abstract Shallow population structure is generally reported for most marine fish and explained as a consequence of high dispersal, connectivity large size. Targeted gene analyses more recently genome‐wide studies have challenged such view, suggesting that adaptive divergence might occur even when neutral markers provide genetic homogeneity across populations. Here, 381 SNP s located in transcribed regions were used to assess large‐ fine‐scale the European hake ( M erluccius merluccius ),...
The genomic architecture underlying ecological divergence and speciation with gene flow is still largely unknown for most organisms. One central question whether genome-wide or localized in 'genomic mosaics' during early stages when pronounced. Empirical work has so far been limited, the relative impacts of natural selection on patterns have not fully explored. Here, we use ecotypes Atlantic cod to investigate diversity population differentiation a system characterized by high large...
Atlantic herring is widespread in North and adjacent waters one of the most abundant vertebrates on earth. This species well suited to explore genetic adaptation due minute differentiation at selectively neutral loci. Here, we report hundreds loci underlying ecological different geographic areas spawning conditions. Four these represent megabase inversions confirmed by long read sequencing. The architecture deviates from expectation under a classical infinitesimal model for complex traits...
We examined the long-term temporal (1910s to 1990s) genetic variation at eight microsatellite DNA loci in brown trout (Salmo trutta L) collected from five anadromous populations Denmark assess stability of composition and estimate effective population sizes (Ne). Contemporary historical samples consisted tissue archived scales, respectively. Pairwise thetaST estimates, a hierarchical analysis molecular variance (amova) multidimensional scaling pairwise distances between revealed much closer...
Abstract Reproductive competition may lead to a large skew in reproductive success among individuals. Very few studies have analysed the paternity contribution of individual males spawning aggregations fish species with huge census population sizes. We quantified variance male cod under experimental conditions over an entire season. Male was estimated by microsatellite‐based parentage analysis offspring produced six separate groups cod. In total, 1340 and 102 spawnings distributed across...
Abstract Brown trout populations in the Hardanger Fjord, Norway, have declined drastically due to increased exposure salmon lice from salmonid aquaculture. We studied contemporary samples seven and historical (1972 1983) two largest populations, one of which has whereas other remains stable. analysed 11 microsatellite loci, including tightly linked UBA gene major histocompatibility class I complex (MHC) another locus TAP2A gene, also associated with MHC. The results revealed asymmetric flow...
Abstract The advent of second‐generation sequencing has made it possible to quickly and economically generate whole mitochondrial genome (mitogenome) sequences. To date, mitogenome studies nonmodel organisms have demonstrated increased power for resolving interspecies relationships. We explored an alternate use such data recover relationships population history closely related lineages with a shallow evolutionary history. Using GS‐FLX platform, we sequenced 106 mitogenomes from the Coregonus...
Abstract Regulations on the exploitation of populations commercially important fish species and ensuing consumer interest in sustainable products have increased need to accurately identify population origin products. Although genomics-based tools proven highly useful, there are relatively few examples marine displaying accurate assignment. We synthesize data for 156 single-nucleotide polymorphisms typed 1039 herring, Clupea harengus L., spanning Northeast Atlantic develop a tool that allows...
The evolutionary process that occurs when a species colonizes new environment provides an opportunity to explore the mechanisms underlying genetic adaptation, which is essential knowledge for understanding evolution and maintenance of biodiversity. Atlantic herring has estimated total breeding stock about 1 trillion (10 12 ) colonized brackish Baltic Sea within last 10,000 y. Minute differentiation between populations at selectively neutral loci combined with this rapid adaptation...
Abstract Genetic data have great potential for improving fisheries management by identifying the fundamental units—that is, biological populations—and their mixing. However, so far, number of practical cases marine using genetics has been limited. Here, we used Atlantic cod in Baltic Sea to demonstrate applicability a complex scenario involving mixing two genetically divergent populations. Specifically, addressed several assumptions current assessment Through analysis 483 single nucleotide...
Abstract Environmental DNA (eDNA) is increasingly used for monitoring marine organisms; however, offshore sampling and time lag from to results remain problematic. In order overcome these challenges a robotic sampler, 2nd generation Sample Processor (ESP), was tested autonomous analysis of eDNA four commercial fish species in 4.5 million liter mesocosm. The ESP enabled situ analysis, consisting water collection, filtration, extraction qPCR which allowed real-time remote reporting archival...
Significance Fish are harvested nonrandomly, potentially inducing selection pressures and adaptations of phenotypes that could impede sustainable natural resource management. To assess the potential for fishing-induced selection, must also be considered, which represents a challenge in broadcast spawning fish wild. We compared harvest on size behavioral traits wild northern pike ( Esox lucius ) population. Harvest body operated opposition. but not acted directly behavior, favoring timid...
Abstract We developed and validated a mixed-stock analysis (MSA) method with 59 single-nucleotide polymorphisms selected from genome-wide data to assign individuals populations in samples of Atlantic herring the North Baltic seas. analysed 3734 spawning locations scientific catches mixed feeding stocks demonstrate “one-fits-all” tool unprecedented accuracy for monitoring spatio-temporal dynamics throughout large geographical range complex stock mixing. re-analysed time-series (2002–2021)...