The presence of iteroparous salmonid spawning grounds affects the stable isotope signatures of food web components in Swedish boreal streams.

ABSTRACT: Marine-derived nutrients (MDN) translocated by anadromous fish can strongly be linked to the dynamics and structure of resident freshwater communities. Yet there is limited knowledge on the transport of marine nutrients by Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) from the Baltic Sea and their incorporation into the trophic system of the boreal streams. Here, stable carbon (δ¹³C) and nitrogen (δ¹⁵N) isotopes were measured in food web components (periphyton, benthic macroinvertebrates, and a predatory fish (freshwater-resident brown trout) of four sites with and without salmonid spawning grounds. Two sites (MDN sites) had spawning Atlantic salmon and sea trout and two other sites (reference sites) had no spawning or mortality areas of the

SUBMITTER: Naddafi R 

PROVIDER: S-EPMC11800077 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature