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68 results for “Coregonus”
Parasite communities of Coregonus spp. from Swiss and Norwegian Lakes
<p>Data on the parasite communities of Coregonus spp. from 5 lakes in Switzerland and 2 lakes in northern Norway. These data represent 15 communities from Switzerland and 5 from Norway that were used in the Host sampling completeness analysis in Llopis‐Belenguer, C., J. A. Balbuena, I. Blasco‐Costa, A. Karvonen, V. Sarabeev, and J. Jokela. 2022. Sensitivity of bipartite network analyses to incomplete sampling and taxonomic uncertainty. Ecology.</p>
Photograph measurements of broad whitefish (Coregonus nasus) body size
<p>The dataset contains photograph measurements of broad whitefish (<em>Coregonus nasus</em>). Measurements (mm; with the scale set to the image) were taken using ImageJ. There are 15 measurements total; see the “Measurement Guide” file for details. Broad whitefish were harvested and photographed in the Gwich’in Settlement Area by community collaborators in 2017 & 2018, along the Peel Channel in the Mackenzie Delta and the Peel River.</p> <p>Measurements were used to predict fish weight using random forest analysis as a methodology for community-based data collection. The “Data Type” column refers to the dataset fish were randomly assigned to as part of this process. “True Fish Weight (g)” and “True Fish Length (mm)” were collected in the field by community monitors.</p> <p>Data collection was done as part of a research program that began in 2017 between Gwich’in community members, renewable resources organizations within the Gwich'in Settlement Area, and university scientists.</p>
Fig.5 in Genetic And Morphological Variability Of Small Vendace (Coregonus Albula (Linnaeus, 1758)) Population In Three Latvian Lakes
Fig.5. Principal component analysis (PCA) plot of the genetic structuring among the three vendace populations. A). PC1 and PC2 explain 25.50% and 21.88% of the total variation, respectively (by allozyme markers); B). PC1 and PC2 explain 19.52% and 13.73% of the total variation, respectively (by RAPD markers).
Fig. 4 in Genetic And Morphological Variability Of Small Vendace (Coregonus Albula (Linnaeus, 1758)) Population In Three Latvian Lakes
Fig. 4. Number of RAPD loci and gene diversity of Coregonus albula in three Latvian lakes, based on RAPD markers.
Fig.3 in Genetic And Morphological Variability Of Small Vendace (Coregonus Albula (Linnaeus, 1758)) Population In Three Latvian Lakes
Fig.3. Allelic richness and polymorphism in Coregonus albula populations in studied lakes based on allozyme markers.
Data from: A de novo chromosome-level genome assembly of Coregonus sp. "Balchen": one representative of the Swiss Alpine whitefish radiation
<p>Salmonids are of particular interest to evolutionary biologists due to their incredible diversity of life-history strategies and the speed at which many salmonid species have diversified. In Switzerland alone, over 30 species of Alpine whitefish from the subfamily Coregoninae have evolved since the last glacial maximum, with species exhibiting a diverse range of morphological and behavioural phenotypes. This, combined with the whole genome duplication which occurred in the ancestor of all salmonids, makes the Alpine whitefish radiation a particularly interesting system in which to study the genetic basis of adaptation and speciation and the impacts of ploidy changes and subsequent rediploidization on genome evolution. Although well curated genome assemblies exist for many species within Salmonidae, genomic resources for the subfamily Coregoninae are lacking. To assemble a whitefish reference genome, we carried out PacBio sequencing from one wild-caught <i>Coregonus sp. "Balchen" </i>from Lake Thun to ~90x coverage. PacBio reads were assembled independently using three different assemblers, Falcon, Canu and wtdbg2 and subsequently scaffolded with additional Hi-C data. All three assemblies were highly contiguous, had strong synteny to a previously published <i>Coregonus</i>linkage map, and when mapping additional short-read data to each of the assemblies, coverage was fairly even across most chromosome-scale scaffolds. Here, we present the first <i>de novo</i>genome assembly for the Salmonid subfamily Coregoninae. The final 2.2 Gb wtdbg2 assembly included 40 scaffolds, an N50 of 51.9 Mb, and was 93.3% complete for BUSCOs. The assembly consisted of ~52% TEs and contained 44,525 genes.</p>
Data from: A de novo chromosome-level genome assembly of Coregonus sp. “Balchen”: one representative of the Swiss Alpine whitefish radiation
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Data from: Evolution and disappearance of sympatric Coregonus albula in a changing environment - a case study of the only remaining population pair in Sweden
<p>During the past 50 years Fennoscandian populations of spring-spawning Baltic cisco (<em>Coregonus albula</em>), sympatric to common autumn-spawners, have declined or disappeared; e.g., three out of four known spring-spawning populations in Sweden are regarded as extinct. Over the same period, climate has changed and populations have been subject to other anthropogenic stressors. We compared historic (1960s) and recent (1990-2000s) morphological data from the still existent sympatric cisco populations in Lake Fegen, Sweden. Phenotypic changes were found for spring-spawners making them more similar to the sympatric autumn-spawners (that had remained virtually unchanged). Based on results for other salmoniform fishes, a phenotypically plastic response to increased temperature during early development appears unlikely. The recent material was also analysed with microsatellite markers; long-term effective population size in spring-spawners was estimated to be about 20 times lower than autumn-spawners, with signs of long-term gene flow in both directions and a recent genetic bottleneck in spring-spawners. The change towards a less distinct phenotype in spring-spawners is suggested to reflect a recent increase in gene flow from autumn-spawners. Time since divergence was estimated to only c. 1 900 years (95% CI: 400 – 5 900), but still the Fegen populations represent the most morphologically and genetically distinct sympatric populations studied. Consequently, we hypothesise that less distinct population pairs can be even younger, and that spring-spawning may have repeatedly evolved and disappeared in several lakes since the end of the last glaciation, concurrent with changed environmental conditions.</p>
Genetic relationships between sympatric and allopatric Coregonus ciscoes in North and Central Europe
<p><strong>Background</strong></p> <p>Sympatric speciation along ecological gradients has been studied repeatedly, in particular in freshwater fishes. Rapid post-glacial ecological divergence has resulted in numerous endemic species or ecologically distinct populations in lakes of the temperate zones. Here, we focus on the Baltic cisco (<em>Coregonus</em> <em>albula</em>) complex, to study the genetic similarity among two pairs of sympatric autumn- and spring-spawning populations from post-glacial German Lakes Stechlin and Breiter Luzin. For comparison, we included a similar pair of sympatric populations from the Swedish Lake Fegen. We wanted to explore potential genetic similarities between the three sympatric cisco population pairs in the three lakes, to evaluate whether the pairs may have emerged independently in the three lakes, or whether two different species may have colonized all three lakes independently. Furthermore, we considered allopatric <em>C. albula</em> populations from three Polish, three Finnish, and four Swedish locations, and added one Siberian population of the sister species <em>C. sardinella</em> and a Swedish <em>C. maraena</em> (whitefish) population. By genotyping nine microsatellite markers in 655 individuals from these 18 populations, we wanted to elucidate how strongly the cisco populations differ across a larger geographical area within Europe. Finally, we compared the genetic differences between the spring- and autumn-spawning populations of ciscoes in the two German lakes to infer the potentially deteriorating effect of strong anthropogenic pressure on the lakes.</p> <p><strong>Results</strong></p> <p>Dendrogram, Principal Coordinate Analysis and admixture analysis all indicated strong correspondence between population differentiation and geographical location for most cisco populations in Europe, including the Siberian population of <em>C. sardinella</em>. However, populations from some Swedish lakes deviated from this general pattern, by showing a distinct genetic structure. We found evidence for independent evolution of the three sympatric population pairs because the populations co-occurring in the same lake were always most closely related. However, genetic differentiation was weak in the two German population pairs, but strong in the Swedish Lake Fegen, indicating that the weak differentiation in the German pairs reported earlier has eroded further.</p> <p><strong>Conclusions</strong></p> <p>Our results suggest that the genetic differentiation at neutral genetic markers among populations of the Baltic cisco complex has evolved (and is maintained) by random genetic drift in isolated populations. However, earlier studies on the Swedish populations combining mitochondrial DNA and microsatellite data indicate that also post-glacial immigration from separate glacial refugia has shaped the present genetic population structure. The low neutral differentiation of the German sympatric pairs in contrast to the Swedish pair suggests that recent anthropogenic effects on the lakes in Germany may put the endemic spring-spawners at risk to extinction.</p>
Concordant patterns of morphological, stable isotope, and genetic variation in a recent ecological radiation (Salmonidae:Coregonus spp.)
<p>Groups of sympatric taxa with low inter-specific genetic differentiation, but considerable ecological differences, offer great opportunities to study the dynamics of divergence and speciation. This is the case of ciscoes (<em>Coregonus</em> spp.) in the Laurentian Great Lakes, which are characterized by a complex evolutionary history and are commonly described as having undergone an adaptive radiation. In this study, morphometrics, stable isotopes and transcriptome sequencing were used to study the relationships within the <em>Coregonus artedi</em> complex in western Lake Superior. We observed general concordance for morphological, ecological and genomic variation, but the latter was more taxonomically informative as it showed less overlap among species in multivariate space. Low levels of genetic differentiation were observed between individuals morphologically identified as <em>C. hoyi</em> and <em>C. zenithicus</em>, which could be evidence of incomplete lineage sorting or recent hybridization between the two groups. Transcriptome-based single nucleotide polymorphisms exhibited significant divergence for genes associated with vision, development, metabolism and immunity among species that occupy different habitats. This study highlights the importance of using an integrative approach when studying groups of taxa with a complex evolutionary history, as individual-level analyses of multiple independent datasets can provide a clearer picture of the patterns and processes associated with the origins of biodiversity.</p>
Monitoring growth of whitefish (Coregonus cf. suidteri) in Lake Hallwil
<p><span>Many lakes of the pre-Alpine region suffered from severe eutrophication that affected the natural reproduction of whitefish (<em>Coregonus </em>spp.) and necessitated large-scale supportive breeding programs. With the advanced reoligotrophication, it is now important to evaluate the relevance of continued artificial breeding for population dynamics. We focused on a whitefish population of a lake that has reached phase III of the reoligotrophication, i.e., lake biomass production is declining since 2012 in response to low phosphorus concentrations. We show that most eggs are naturally spawned, the observed oxygen concentrations would again support embryo development at all depths, and ready-to-hatch embryos can indeed be found on spawning grounds. We marked all hatchery-produced eggs of the 2014 cohort with Alizarin red, stocked them as usual (at larval or early juvenile stages), and recaptured them over a period of five years. Fish were aged from yearly growth rings on scales, and otoliths were checked for marks. We found 90.3% of the 2014 cohort to be hatchery-born. This ratio did not decline with fish age. We also determined juvenile growth of the cohorts 2012-2020 (based on the first annual ring on scales) and found that stocking intensity predicted juvenile growth (r<sup>2</sup> = 0.67). This strong density dependence suggest that stocking has largely determined population size over the first nine years of reoligotrophication phase III. We conclude that large areas of spawning grounds allow again for successful embryogenesis, that large quantities of eggs are naturally spawned, but that natural recruitment is significantly reduced by ecological or evolutionary factors, e.g., competition with hatchery-born fish, desynchronization of trophic interactions, or long-term effects of fishing- or hatchery-induced evolution</span></p>
High-density genomic data reveal fine-scale population structure and pronounced islands of adaptive divergence in lake whitefish (Coregonus clupeaformis) from Lake Michigan
<p>Understanding patterns of genetic structure and adaptive variation in natural populations is crucial for informing conservation and management. Past genetic research using 11 microsatellite loci identified six genetic stocks of lake whitefish (<em>Coregonus clupeaformis</em>) within Lake Michigan, USA. However, ambiguity in genetic stock assignments suggested those neutral microsatellite markers did not provide adequate power for delineating lake whitefish stocks in this system, prompting calls for a genomics approach to investigate stock structure. Here, we generated a dense genomic dataset to characterize population structure and investigate patterns of neutral and adaptive genetic diversity among lake whitefish populations in Lake Michigan. Using Rapture sequencing, we genotyped 829 individuals collected from 17 baseline populations at 197,588 SNP markers after quality filtering. Although the overall pattern of genetic structure was similar to the previous microsatellite study, our genomic data provided several novel insights. Our results indicated a large genetic break between the northwestern and eastern sides of Lake Michigan, and we found a much greater level of population structure on the eastern side compared to the northwestern side. Collectively, we observed five genomic islands of adaptive divergence on five different chromosomes. Each island displayed a different pattern of population structure, suggesting that combinations of genotypes at these adaptive regions are facilitating local adaptation to spatially heterogenous selection pressures. Additionally, we identified a large linkage disequilibrium block of ~8.5 Mb on chromosome 20 that is suggestive of a putative inversion but with a low frequency of the minor haplotype. Our study provides a comprehensive assessment of population structure and adaptive variation that can help inform management of Lake Michigan's lake whitefish fishery and highlights the utility of incorporating adaptive loci into fisheries management. </p>
Underwater video of lake whitefish Coregonus clupeaformis spawning in lake Michigan
<p>The lake whitefish <em>Coregonus clupeaformis,</em> <em>dikameg</em> in Anishinaabemowin, holds cultural importance, and is a mainstay of commercial, recreational, and subsistence fisheries throughout North America. In the Laurentian Great Lakes, declines in recruitment, since the early 2000s, have raised concerns among stewards and fishery managers. A more detailed understanding of the lake whitefish mating system could help resolve potential recruitment bottlenecks and thus inform appropriate stewardship actions. Herein, we describe, for the first time, a single lake whitefish spawning event captured using high-resolution underwater videography. From 94 h spent on the water, we captured and analyze a 4.5 min video clip that shows pre-mating, mating, and post-mating behaviour of a male and female lake whitefish from Lake Michigan. The clip shows a number of what we interpret as courtship, site-selection, and spawning behaviours culminating in release of about 20 eggs in a single spawning event. Behaviours that included travelling, physical contact, chasing, circling, orienting, and gamete release are described and time-referenced to a video supplement. This single observation is part of a larger project to assess lake whitefish spawning behaviour in the wild but is noteworthy in that it provides new insights into the spawning behaivour of lake whitefish and appears consistent with reproductive behaviours observed in European coregonines.</p>
Fig. 1 in Genetic And Morphological Variability Of Small Vendace (Coregonus Albula (Linnaeus, 1758)) Population In Three Latvian Lakes
Fig. 1. The location of sampling sites. - Lake Sventes, Lake Nirzas and Lake Rāznas.
Genetic relationships between sympatric and allopatric Coregonus ciscoes in North and Central Europe
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Monitoring growth of whitefish (Coregonus cf. suidteri) in Lake Hallwil
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Concordant patterns of morphological, stable isotope, and genetic variation in a recent ecological radiation (Salmonidae:Coregonus spp.)
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Data from: Which ecological factors influence the level of intraspecific diversity within post-glacial fishes? A case study using Coregonus and Salvelinus
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Integrating acoustic telemetry and demographic modeling to inform cisco (Coregonus artedi) restoration in Keuka Lake, New York
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Data from: Genomic insights on conservation priorities for North Sea houting and European lake whitefish (Coregonus spp.)
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