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11 results for “St. Lawrence River”
Impacts of invasive species on food web energy pathways and quality, St. Lawrence River, 2018-2021.
This dataset contains field measurements collected between 2018 and 2021 from three fluvial lakes in the Upper St. Lawrence River (Canada), including both invaded systems (with dreissenid mussels and round goby) and uninvaded reference sites. Data include georeferenced sampling information (site, lake, latitude, longitude, month, year), water chemistry (total phosphorus, µg/L; conductivity, µS/cm), and habitat descriptors (substrate). Biological records encompass seston, macroinvertebrates, and fish. Fish data comprise species identity, sex, total length (mm), weight (g), relative weight index (Wr), and detailed fatty acid composition expressed as relative proportions (%) and concentrations (µg/mg), including essential LC-PUFAs (EPA, DHA), n-3 and n-6 polyunsaturated fatty acids. Stable isotope data are provided, including carbon (δ13C) and nitrogen (δ15N) ratios, C:N ratios, and isotopic baselines from pelagic (δ13Cpel, δ15Npel) and benthic (δ13Cben, δ15Nben) sources. Derived variables, such as pelagic diet proportion and trophic position, were calculated using the two-source mixing model described by Post (2002) (DOI: https://doi.org/10.1890/0012-9658(2002)083[0703:USITET]2.0.CO;2). These data provide a comprehensive resource for examining food web structure, energy pathways, and the ecological impacts of invasive species in large river ecosystems.
Joint series underlying the paper " Compound coastal-riverine flooding of St. Lawrence River coasts under sea level rise conditions"
<p>Compound coastal-riverine flooding, known as flooding events caused by the co-occurrence of high streamflow and coast water levels, can have substantial economic and social implications in low-lying coastal regions. Recent studies over Canada’s coasts have shown that neglecting the interdependency between flood drivers can underestimate the risk of flooding by up to 50%. However, to date, such interdependency and its effect on the frequency of compound riverine-coastal flooding has not been investigated for the coasts of the St. Lawrence River, Estuary, and Gulf system (StL), where Sea Level Rise (SLR), along with intensified river peaks, are already threatening communities. In this study, a copula-based bivariate frequency analysis (AND hazard scenario) was applied to quantify the differences between joint return periods computed under dependent and independent assumptions, for 26 sites along the StL. Furthermore, design pairs for 100-year joint events in the historical period (1986-2020) were compared with the 2100 horizon, where the SLR associated with the RCP8.5 emission scenario was incorporated into the water level time series. Results show that 1) the independence assumption can underestimate the frequency of compound flooding in the Fluvial Section of the StL by up to 30 times and 2) the SLR can increase the frequency of compound flooding by up to 50 times in the Estuary and the Gulf and by up to 5 times in the Fluvial Section of the StL. This study highlights the need for explicit consideration of the dependence between flood drivers and of SLR in the delineation of flood maps along all of the coasts of the St. Lawrence.</p>
The site of an experimental oil spill located at a freshwater wetland along the St. Lawrence River re-visited after 21 years
<p>In 1999 a wetland close to Ste. Croix de Lotibiniere (Quebec, Eastern Canada) and located along the St. Lawrence River was the site of a simulated oil spill. Test plots were set up, contaminated with crude oil and subsequently used to test natural attenuation, nutrient amendment or vegetation cropping as remediation treatments. In 2020, this study revisited the former test plots to investigate any lingering effects of the original Ste. Croix study. Test plot sediments and control sediments featured detectable quantities (75 - 165 g/kg) of mid-chain n-alkanes (C10-C36), but no other kinds of hydrocarbons. Differences in hydrocarbon, total organic carbon, nitrogen and phosphorous content were not significantly different between test plot sediments and control sediments. A microbial analysis did not detect significant differences in microbial load, microbial diversity or microbial community composition between test plot sediments and control sediments. Key genes for the aerobic and anaerobic degradation of n-alkanes as well as for the aerobic degradation of polycyclic aromatic hydrocarbons were detected in all sediment samples. Abundances of these genes did not differ significantly between formerly oil-contaminated sediments and control sediments. This study shows that after 21 years, previously oil-contaminated sediments of the Ste. Croix wetland can be considered completely remediated irrespective of the performed remediation treatment.</p> <p>In this file archive are included, metadata, metagenome co-assembly, functional and taxonomic annotations, contigs and genes abundance matrices and MAGs files.</p> <p>Raw Illumina sequence data was deposited in the NCBI SRA portal under accession PRJNA818909.</p>
Fig. 3 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby
Fig. 3. Mean abundance of Diplostomum spp. in two-year old yellow perch (Perca flavescens) at sites from the three fluvial lakes of the St. Lawrence River between years before and after the establishment of the invasive round goby. Data are expressed as mean number of metacercariae of the genus Diplostomum per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different letters beside histograms. Fish silhouettes within graph panels highlight the presence of the invasive round goby at that given site/year(s), the icon being gray if the species was only occasionally recorded. Main ring-billed gull colonies are illustrated on the map by bird silhouettes: 1 = Cornwall; 2 = Beauharnois; 3 = ̂ILe Deslauriers; 4 = ̂Ile Lefebvre.
Fig. 5 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby
Fig. 5. Trends in ring-billed gull (Larus delawarensis) populations (A) and in water levels in the St. Lawrence River (B) during the study period (1998‾2016). A: The solid black curve shows the variation over time of the total number of ring-billed gulls recorded along the St. Lawrence River from Cornwall to Trois-Rivìeres whereas dotted curves depict the change in gull counts in each of the main colonies within this area. The numbered bird icons match those shown in Figs. 1 and 3: Bird 1 = Cornwall; bird 2 = Beauharnois; bird 3 = ̂ILe Deslauriers; bird 4 = ̂Ile Lefebvre. B: Monthly mean water levels in April (green) and September (gray) at the Montreal Jetty no 1 station (solid lines) and at the Summerstown station (dashed lines). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 2 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby
Fig. 2. Variation in Diplostomum spp. mean abundance over years in Lake St. Francis (LSF-1) in (A) one-year old yellow perch (Perca flavescens) and (B) one-year old golden shiner. Data are expressed as mean number of metacercariae of the genus Diplostomum per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different letters above histograms. Black fish silhouettes within graph panels illustrate the occurrence of the invasive round goby among the fish captured at that site. See Fig. 3 for site location.
Fig. 1 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby
Fig. 1. Temporal changes in the mean abundance of Diplostomum spp. in spottail shiners (Notropis hudsonius) (green circle) and round gobies (Neogobius melanostomus) (black square) at two sites in the St. Lawrence River. Data are expressed as mean numbers of metacercariae of Diplostomum spp. per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different lower-case letters (round gobies) and upper-case letters (spottail shiners). Arrows within graph panels point to year of first sighting of the invasive round goby at each site. On the background map, sampling sites (̂Ilet Vert = IVT, ̂Iles de la Paix = IPA) are identified and the host species examined are represented by different fish silhouettes (green = spottail shiners, black = round gobies). Bird silhouettes indicate where main colonies of ring-billed gulls are localized: 2 = Beauharnois; 3 = ̂ILe Deslauriers. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 6 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby
Fig. 6. Potential mechanisms to explain the observed sharp decline of Diplostomum spp. infection in fish in the St. Lawrence River. Those involving a dilution effect induced by the exotic round goby (Neogobius melanostomus) appears in pale red rectangles with rounded corners. Other biotic or abiotic factors are displayed in blue rectangles. Gastropod illustration, representing lymnaeid snails, is a graphic art by Tracey Saxby, provided by the Integration and Application Network (IAN), University of Maryland Center for Environmental Science (www.ian.umces.edu/imagelibrary). The bird image, used to illustrate a ring-billed gull (Larus delawarensis), is a public domain clipart downloaded from www. openclipart.org. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Dissolved organic matter degradation in the freshwater portion of the St. Lawrence River (2019)
<p>During the summer of 2019, we sampled a 207 km transect of the St. Lawrence, a large temperate river in which flows two strikingly distinct water masses in terms of origin as well as chemical and physical properties. We then assessed dissolved organic matter bio- and photo-reactivity at 40 sites along the river through a series of standardized incubations and exposure to simulated sunlight, and then used water irradiance and morphometric profiles to estimate in situ areal rates of processing across the river. The main variables presented are DOC concentrations and DOM composition data generated by a PARAFAC model. In addition, this dataset also includes results for a suite of standard physical and chemical variables as well as light attenuation profiles obtained with a profiling radiometer.</p>
Genomic population structure of striped bass (Morone saxatilis) from the Gulf of St. Lawrence to Cape Fear River
<p>Striped Bass, Morone saxatilis (Walbaum, 1792), is an anadromous fish species that supports fisheries throughout North America and is native to the North American Atlantic Coast. Due to long coastal migrations that span multiple jurisdictions, a detailed understanding of population genomics is required to untangle demographic patterns, understand local adaptation, and characterize population movements. This study used 1256 single nucleotide polymorphism (SNP) loci to investigate genetic structure of 477 Striped Bass sampled from 15 locations spanning the North American Atlantic coast from the Gulf of St. Lawrence, Canada to the Cape Fear River, United States (US). We found striking differences in neutral divergence among Canadian sites, which were isolated from each other and US populations, compared with US populations that were much less isolated. Our SNP dataset was able to assign 99% of Striped Bass back to six reporting groups, a 39% improvement over previous genetic markers. Using this method, we found (1) evidence of admixture within Saint John River, indicating that migrants from the US and from Shubenacadie River occasionally spawn in the Saint John River; (2) Striped Bass collected in the Mira River, Cape Breton, Canada were found to be of both Miramichi River and US origin ; (3) juveniles in the newly restored Kennebec River population had small and nonsignificant differences from the Hudson River; and (4) tributaries within the Chesapeake Bay showed a mixture of homogeny and small differences among each other. This study introduces new hypotheses about the dynamic zoogeography of Striped Bass at its northern range and has important implications for the local and international management of this species.</p>
Genomic population structure of striped bass (Morone saxatilis) from the Gulf of St. Lawrence to Cape Fear River
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