Autochthonous production sustains food webs in large perialpine lakes, independent of trophic status: Evidence from amino acid stable isotopes

Saboret, Grégoire; Stalder, Dominique; Matthews, Blake; Brodersen, Jakob; Schubert, Carsten J.

doi:10.1111/fwb.14071

Cited by 1 publication

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“…Instead, we propose that greater use of bacterially derived energy, channelled through the microbial loop (i.e., slow energy) may improve reproductive fitness in lake trout-this is especially evident for males (Figure 2). Although they may not provide omega-3 polyunsaturated fatty acids like algae, bacteria are still likely to provide key macronutrients such as protein and fat, and are becoming an increasingly recognised source of energy supporting lake biomass (Saboret et al, 2023). In this case, differences in energy channelling among individuals could be mediated by diet diversity (Weisse et al, 1990).…”

Section: Discussionmentioning

confidence: 99%

Energy channelling, food chain length and body condition in a northern lake predator

Shipley,

McMeans,

Besser

et al. 2023

Freshwater Biology

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Identifying potential links between food web structure and animal body condition is fundamental for predicting the long‐term persistence of populations under rapidly changing environments. Northern lakes, and the cold‐water adapted species that inhabit them, are particularly vulnerable to a warming climate. We explored relationships among body condition and energy channel use in lake trout (Salvelinus namaycush) and seasonal variation in food‐chain length in the Lake of Two Rivers, Ontario, Canada. Bayesian mixing models using carbon isotope values (δ13C) of essential amino acids showed that individuals utilising multiple energy channels had higher gonad mass, suggesting that dietary diversity has reproductive fitness benefits. Amino acid nitrogen isotope (δ15N) analysis revealed seasonal variation in food chain length, with extension of the food web during winter and spring and truncation of the food web during summer. Although these findings illustrate increased omnivory of lake trout during summer, there was no clear evidence that seasonal changes in food chain length had an impact on trout condition. These findings provide new insight into potential relationships between food web structure, energy flow and consumer condition in freshwater ecosystems, thereby revealing potential responses of species to shifting ecosystem states under intensifying climate change at high latitudes.

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Section: Discussionmentioning

confidence: 99%

Energy channelling, food chain length and body condition in a northern lake predator

Shipley,

McMeans,

Besser

et al. 2023

Freshwater Biology

View full text Add to dashboard Cite

show abstract

Autochthonous production sustains food webs in large perialpine lakes, independent of trophic status: Evidence from amino acid stable isotopes

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 1 publication

References 164 publications

Energy channelling, food chain length and body condition in a northern lake predator

Energy channelling, food chain length and body condition in a northern lake predator

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