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<p>Diatom analysis of surface sediment samples, combined with environmental data from fifty coastal and near-coast lakes on the Burin Peninsula, Newfoundland, Canada, was conducted to investigate the relationship between species composition and environmental variables. All of the lakes are shallow (0.1–4.8&#xa0;m), vary in size (0.07–43.9&#xa0;ha), salinity (0.02–28.92 PSU), and pH (4.83–8.52). Most of the diatom species we identified have been previously documented in lakes across North America that share similar environmental conditions. Brackish or marine diatom species were observed in all the lakes, with only a few exhibiting an elevated salinity, likely due to aerial transport via sea spray facilitated by strong winds typical of the area. After partialling out the influence of co-variables, distance-to-the-ocean (DTTO) explained the highest share of variance in the diatom data, followed by total nitrogen, depth, and salinity. The importance of DTTO likely stems from its ability to capture the combined effects of multiple interacting factors that vary along the DTTO gradient and shape diatom assemblage in distinct ways. We assume that the most relevant of these factors are exposure to marine influences—such as saltwater inundations and sea spray—and the lake’s position within the drainage network.</p>

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Distance-to-the-ocean drives diatom assemblages in coastal lakes of Burin Peninsula (Newfoundland, Canada)

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Cyprian Kowalczyk,
  • Les. C. Cwynar,
  • Karina Apolinarska,
  • Mikołaj Kokociński,
  • Krzysztof Pleskot

摘要

Diatom analysis of surface sediment samples, combined with environmental data from fifty coastal and near-coast lakes on the Burin Peninsula, Newfoundland, Canada, was conducted to investigate the relationship between species composition and environmental variables. All of the lakes are shallow (0.1–4.8 m), vary in size (0.07–43.9 ha), salinity (0.02–28.92 PSU), and pH (4.83–8.52). Most of the diatom species we identified have been previously documented in lakes across North America that share similar environmental conditions. Brackish or marine diatom species were observed in all the lakes, with only a few exhibiting an elevated salinity, likely due to aerial transport via sea spray facilitated by strong winds typical of the area. After partialling out the influence of co-variables, distance-to-the-ocean (DTTO) explained the highest share of variance in the diatom data, followed by total nitrogen, depth, and salinity. The importance of DTTO likely stems from its ability to capture the combined effects of multiple interacting factors that vary along the DTTO gradient and shape diatom assemblage in distinct ways. We assume that the most relevant of these factors are exposure to marine influences—such as saltwater inundations and sea spray—and the lake’s position within the drainage network.