Using movement, diet, and genetic analyses to understand Arctic charr responses to ecosystem change

Marine Ecology Progress Series, Год журнала: 2021, Номер 673, С. 135 - 149

Опубликована: Июнь 8, 2021

Arctic charr Salvelinus alpinus are a commercially and culturally valued species for northern Indigenous peoples. Climate shifts could have important implications those that rely on them, but studies evaluate responses to ecosystem change the spatial scales at which they occur rare. We compare marine-phase habitat use, long-term diet patterns, trends in effective population size of from 2 areas (Nain Saglek) Nunatsiavut, Labrador, Canada. Tagged both frequently occupied estuaries some also used other habitats extended headland environments outside their natal fjords. Despite relatively small distances separating these study (<200 km), we observed differences use diet. Northern stocks (including were more reliant invertebrates than southern (e.g. Nain), capelin sand lance prey. The coastal headlands varied, with Saglek occupying Nain, only 1 year study. Long-term commercial catches indicate tendency Nain stay within fjords varies annually relates availability. demonstrated capacity alter changing environmental conditions, notable declines associated regime shift 1990s northwest Atlantic. Collectively, results demonstrate behavioral plasticity may be insufficient deal large perturbations expected arise climate.

Язык: Английский

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eDNA metabarcoding reveals riverine fish community structure and climate associations in northeastern Canada

Environmental DNA, Год журнала: 2024, Номер 6(1)

Опубликована: Янв. 1, 2024

Abstract Climate change is a critical threat to northern freshwater ecosystems, yet many remote areas are data deficient in terms of biodiversity information. Generating community composition through collection environmental DNA (eDNA) less labor‐intensive than traditional sampling methods and being increasingly used that have been historically difficult sample such as habitats. Here, we employed eDNA metabarcoding using three mitochondrial markers at 174 coastal river sites, sampled over years (2019–2021) across broad region northeastern North America, Newfoundland Labrador. We characterized current riverine fish composition, compared it records, quantified the influence climate on variation composition. The analysis detected 33 species (1–13 per location), including non‐native species, well several new possible range expansions. Variance partitioning with redundancy indicated ~56% could be explained by spatial factors (~21% ~7%, respectively, an additional ~28% shared). A temporal comparison subset locations both historical records (1965–1985) revealed more were average sampling, method small portion (~4%) space (~10%) (~7%). Ultimately, this work most complete survey diadromous fishes present Labrador date, highlights detections previously unknown diversity for region, provides future direction application

Язык: Английский

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Integrated analyses of SNP-genotype and environmental data in a continuously distributed snapper species (Lutjanus johnii, Bloch, 1792) reveals a mosaic of populations and a challenge for sustainable management

ICES Journal of Marine Science, Год журнала: 2021, Номер 78(9), С. 3212 - 3229

Опубликована: Сен. 13, 2021

Abstract Understanding population structure is important for predicting the outcomes of anthropogenic development, harvest, and environmental change on abundance fisheries species. Logically, use several data sources best delineating structure, but combining across types adds extra challenges as results can be incongruent. Here, genetic markers were used to test hypotheses about in a collection 523 tropical inshore finfish (Lutjanus johnii) northern Australia from 20 locations. Redundancy analyses (RDA) statistically correlations among providing basis reconciliation insights into ecological evolutionary processes. Genomic (10349 SNP loci) revealed low, significant divergence (max FST 0.0402) between 16 A total 12 putative contiguous biological stocks proposed whose distributions correlated with IMCRA bioregions not existing regions management fishery. RDA showed correlation (otolith chemistry parasite abundances) genotype two three region-wide supporting stock suggesting that L. johnii may locally adapted heterogeneous environment. These findings are conservation commercially recreationally guide future actions.

Язык: Английский

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SNP Polymorphisms Are Associated with Environmental Factors in Sockeye Salmon Populations Across the Northwest Pacific: Insights from Redundancy Analysis

Genes, Год журнала: 2024, Номер 15(11), С. 1485 - 1485

Опубликована: Ноя. 19, 2024

The SNP variation in sockeye salmon across the Asian part of its range was studied 23 samples from 16 lake-river systems West Pacific Coast to improve understanding genetic adaptation response spawning watersheds conditions. Identification candidate SNPs and environmental factors that can contribute local adaptations populations carried out using redundancy analysis (RDA), a powerful tool for landscape genetics proven be effective genotype-environment association studies. Climatic hydrographic indices (7 total), reflecting abiotic conditions freshwater habitats characterizing temperature regime river basin, variability during year, amount precipitation, as well height maximum tide estuary, were used predictor factors. Among 45 analyzed SNPs, several loci (

Язык: Английский

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Leveraging whole genomes, mitochondrial DNA, and haploblocks to decipher complex demographic histories: an example from a broadly admixed arctic fish

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Дек. 16, 2024

Abstract The study of phylogeography has transitioned from mitochondrial haplotypes to genome-wide analyses, blurring the line between this field and population genomics. Whole-genome sequencing offers opportunity join use both provides density markers necessary investigate genetic linkage recombination along genome. This facilitates unraveling complex demographic histories admixture divergent lineages, as is often case in species evolving recently deglaciated habitats. In study, we sequenced 1120 Arctic Char genomes 33 populations across Canada Western Greenland characterize patterns variation diversity, how they are shaped by hybridization Atlantic glacial lineages. Several lines evidence supported mito-nuclear discordance lineage distribution, with all Canadian under 66 th parallel being characterized introgression lineage, leading higher nuclear diversity. By scanning genome using local PCAs, identified putative low-recombining haploblocks ancestry tracts either described impacts on landscape admixed populations. Finally, inferred conflicting origins recolonization whole vs. for suggesting that sheltered low could enlighten post-glacial histories. Overall, argue Whole-Genome Sequencing, even at depths coverage, a versatile approach phylogeographic dynamics.

Язык: Английский

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