Pelagic niche shift by fishes following restorations of a eutrophic lake
Laen...
Kuupäev
2024
Kättesaadav alates
Autorid
Berthelsen, Andreas S.
Søndergaard, Martin
Kiljunen, Mikko
Eloranta, Antti
Lauridsen, Torben
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Springer
Abstrakt
Lake 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.
Kirjeldus
Märksõnad
biomanipulation, lake management, energy mobilization, stable isotope analysis, topdown control, articles