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Pelagic niche shift by fishes following restorations of a eutrophic lake

dc.contributor.authorBerthelsen, Andreas S.
dc.contributor.authorSøndergaard, Martin
dc.contributor.authorKiljunen, Mikko
dc.contributor.authorEloranta, Antti
dc.contributor.authorLauridsen, Torben
dc.date.accessioned2024-07-05T07:15:24Z
dc.date.available2024-07-05T07:15:24Z
dc.date.issued2024
dc.description.abstractLake restoration by biomanipulation or phosphorus fixation has been commonly applied methods to improve the ecological status of lakes. However, the effects of lake restoration on foodweb dynamics are still poorly understood, especially when biomanipulation and nutrient fixation are used simultaneously. This study investigated the combined effects of a 70% fish removal (mainly roach (Rutilus rutilus Linnaeus, 1758) and bream (Abramis brama Linnaeus, 1758) and Phoslock® treatment on fish trophic ecology in Lyngsø (area: 9.6 ha, mean depth: 2.6 m), Denmark. The lake restoration resulted in decreased nutrient levels, increased water clarity, and increased coverage of more structurally complex submerged macrophytes. Following lake restoration, significant changes in diets of the dominant fish species were observed. Stomach content analyses of roach and perch (Perca fluviatilis Linnaeus, 1758) revealed significantly reduced detritus utilization and increased foraging on macrophytes and macrophyte living invertebrates. Results from stable isotope mixing models indicated a shift from littoral benthic to more pelagic food resources by the dominant fish species. Our findings provide further evidence that lake restorations can lead to substantial changes in lake food webs and fish communities, thereby potentially facilitating a shift toward an ecological state resembling the pristine reference state, less influenced by anthropogenic factors.eng
dc.description.sponsorshipWe would like to acknowledge the Sino-Danish Center, Poul Due Jensens Foundation, and the Research Council of Finland (project number 340901) for providing financial support for the study. This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 951963. In addition, this research was funded through the 2020–2021 Biodiversa+ and Water JPI joint call for research projects, under the BiodivRestore ERA-NET Cofund (GA N°101003777), with the EU and the funding organization Research Council of Finland (project number 3511860). Further, we would like to thank Jian Ge for helping in the field work.eng
dc.identifier.issn1573-5117
dc.identifier.publicationHydrobiologia (2024)eng
dc.identifier.urihttp://hdl.handle.net/10492/9431
dc.identifier.urihttps://doi.org/10.1007/s10750-024-05568-5
dc.publisherSpringer
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/951963/EU/TREICLAKEeng
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)eng
dc.rights© 2024 The Authors.eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/eng
dc.subjectbiomanipulationeng
dc.subjectlake managementeng
dc.subjectenergy mobilizationeng
dc.subjectstable isotope analysiseng
dc.subjecttopdown controleng
dc.subjectarticleseng
dc.titlePelagic niche shift by fishes following restorations of a eutrophic lakeeng
dc.typeinfo:eu-repo/semantics/articleeng

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