Unraveling Lake Geneva's hypoxia crisis in the Anthropocene
Abstract Despite global evidence of lake deoxygenation, its duration, timing, and impacts over decadal to centennial timescales remain uncertain. This study introduces a novel model approach using 150 yr of limnological and paleolimnological data to evaluate the anthropogenic impacts on deep oxygen in Lake Geneva. Results highlight an increase in oxygen consumption rates due to cultural eutrophication, initially triggering historical hypoxia, subsequently exacerbated by reduced winter mixing induced by climate change. Simulations of pre‐eutrophication conditions and future climate scenarios define safe operating spaces for the lake to thrive without severe hypoxia risk. Complete winter mixing and O 2 recharge once every 3 yr can compensate the oxygen demand in Lake Geneva, even when exceeding 1.5 g O 2 m −2 d −1 . However, when complete winter mixing becomes less frequent, even consumption rates similar to those observed before eutrophication can cause persistent hypoxia, posing a significant threat to the survival of hypolimnetic aquatic life.
Authors
- Laura Melo Vieira Soares (ORCID: https://orcid.org/0000-0003-0890-7865)
- Frédéric Soulignac (ORCID: https://orcid.org/0000-0002-0371-8857)
- Nelson G. Hairston (ORCID: https://orcid.org/0000-0002-0615-9843)
- Jean‐Philippe Jenny (ORCID: https://orcid.org/0000-0002-2740-174X)
- Isabelle Domaizon (ORCID: https://orcid.org/0000-0001-9785-3082)
- Victor Frossard (ORCID: https://orcid.org/0000-0003-1338-4739)
- Bruno J. Lemaire (ORCID: https://orcid.org/0000-0002-0227-0106)
- Brigitte Vinçon‐Leite (ORCID: https://orcid.org/0000-0002-0190-0209)
- Cécilia Barouillet (ORCID: https://orcid.org/0000-0002-8004-1149)
- Olivia Desgué‐Itier
- Andrea Lami (ORCID: https://orcid.org/0000-0003-3627-0363)
- Céline Casenave (ORCID: https://orcid.org/0000-0003-0489-4665)
- Georges‐Marie Saulnier
Institutions
- Centre National de la Recherche Scientifique (FR)
- École nationale des ponts et chaussées (FR)
- Cornell University (US)
- Université Paris-Saclay (FR)
- Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
- Mathématiques, Informatique et Statistique pour l'Environnement et l'Agronomie (FR)
- Water Research Institute (IT)
- Laboratoire Eau, Environnement et Systèmes Urbains (FR)
- Université Savoie Mont Blanc (FR)
Publication Details
- Journal
- Limnology and Oceanography Letters
- Published
- 2024-10-08
- DOI
- https://doi.org/10.1002/lol2.10435
- Citations
- 5
- Primary Topic
- Aquatic Ecosystems and Phytoplankton Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- Agence Nationale de la Recherche
- Office Français de la Biodiversité