Département Ecologie aquatique

Ecologie aquatique

Le département d'écologie aquatique de l'Eawag se compose de huit groupes de recherche et englobe une multitude de disciplines différentes de l'écologie et de la biologie de l'évolution, couvrant toute la gamme du niveau individuel aux écosystèmes en passant par les associations. En savoir plus

Actualités du département

Les castors créent des habitats pour les chauves-souris

Eau stagnante, trouées dans la forêt et arbres morts: les chauves-souris trouvent ici de bonnes conditions pour chasser. (Photo: Valentin Moser)
13 novembre 2025 –

Les barrages des castors profitent à des animaux terrestres, par exemple les chauves-souris menacés de disparition.

Les barrages des castors profitent à des animaux terrestres, par exemple les chauves-souris menacés de disparition.
En savoir plus

Les 10 ans du sensor lab de l'Eawag

Une série de capteurs de température avec transmission radio est prête à être entièrement révisée, car les conditions d'utilisation en montagne ou dans les égouts peuvent être difficiles. (Andri Bryner, Eawag)
11 novembre 2025 –

Le Sensorlab fait la fête. Grâce à lui, la recherche sur l'eau reste à la pointe de la technologie, avec de nouvelles solutions de mesure et d'automatisation, de transmission et de gestion des données.

Le Sensorlab fait la fête. Grâce à lui, la recherche sur l'eau reste à la pointe de la technologie, avec de nouvelles solutions de mesure et d'automatisation, de transmission et de gestion des données.
En savoir plus

Les effets indirects font avancer l'évolution

Martin Schäfer prélève un échantillon d'eau dans l'un des étangs expérimentaux (photo : Christoph Walcher, Eawag).
28 août 2025 –

Une étude internationale menée dans les étangs expérimentaux de l'Eawag démontre l'impact des effets écologiques indirects sur l'évolution des espèces.

Une étude internationale menée dans les étangs expérimentaux de l'Eawag démontre l'impact des effets écologiques indirects sur l'évolution des espèces.
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Participez à nos événements

25.02.​2026,
29.06.​2026,
9h00
Eawag Dübendorf
Toxic Cyanobacteria: Identification, Characterization and Communication

PEAK consolidation-level course V63/26

SNSF Starting Grants et Ambizione Fellowships

Informations pour les parties intéressées (anglais)

Aquascope

Imagerie sous-marine en temps réel

Projets de recherche

Investigation of the Resilience and Adaptability of Quagga Mussels

Epigenomics of rapid adaptation in invasive Quagga mussels
Un programme de recherche en plusieurs phases de l'Eawag et de l'Office fédéral suisse de l'environnement (OFEV)

Changement climatique et biodiversité aquatique
Der Rückgang der biologischen Vielfalt ist neben dem Klimawandel eines der drängendsten Umweltprobleme der heutigen Zeit. Das Synthesezentrum Biodiversität bündelt Erkenntnisse und macht sie allgemein verfügbar.

Translational Centre Biodiversity Conservation (TCBC)
Die Architektur von Artgemeinschaften und trophischen Netzwerke in blau-grünen Ökosystemen

Architektur von blau-grünen Gemeinschaften
Dieses Projekt leistet einen Beitrag zur Blue Green Biodiversity Research Initiative - einer Eawag-WSL-Kollaboration, die sich auf die Biodiversität an der Schnittstelle von aquatischen und terrestrischen Ökosystemen konzentriert.

Warming-related community turnover in terrestrial and freshwater ecosystems
Warum blühen giftige Cyanbakterien? ...

Cyano Bloom
Understanding and measuring how flow intermittency drives biodiversity and river functions in an alpine environment

Alpine Streams and Flow Intermittency
La collaboration entre l’Eawag et le WSL a pour objectif d’effectuer des recherches sur la biodiversité à l’interface des écosystèmes aquatiques et terrestres.

Initiative de recherche Blue-Green Biodiversity

Autres projets de recherche

Dernières publications

Bizzozzero, M. R., Marfurt, S. M., Altermatt, F., Willems, E. P., Damm-Reiser, A., Allen, S. J., … Krützen, M. (2025). Integrating environmental DNA metabarcoding and remote sensing reveals known and novel fish diversity hotspots in a world heritage area. Diversity and Distributions, 31(11), e70074 (20 pp.). doi:10.1111/ddi.70074, Institutional Repository

Aim: Shark Bay, a UNESCO World Heritage site in Western Australia, is highly vulnerable to climate change, yet its fish biodiversity remains poorly understood at fine spatial scales. We integrated environmental DNA (eDNA) metabarcoding with high-resolution remote sensing to assess and extrapolate fish diversity patterns, providing a scalable framework for biodiversity monitoring in dynamic coastal ecosystems.
Location: Shark Bay, Western Australia.
Methods: We analysed 270 water samples across 560 km2 using fish-specific 16S and 12S rRNA metabarcoding, comparing our results to earlier studies using conventional methods including seining, trawling, fisheries reports, and fish traps. We linked biodiversity patterns to key environmental variables, including depth, salinity, sea surface temperature, and habitat characteristics derived from high-resolution satellite imagery. To predict fish biodiversity across unsampled areas, we employed machine-learning models, enabling spatial extrapolation of eDNA data across the seascape.
Results: eDNA metabarcoding identified 106 fish species across 132 genera and 71 families, with substantial overlap with conventional monitoring but broader coverage at higher taxonomic levels. Fish richness increased with decreasing salinity, high channel habitat coverage, and moderate depths with high seagrass coverage. We delineated five distinct fish communities (A–E): two shallow seagrass communities—one in sparse seagrass (A) and another in dense seagrass (B), one in channel habitats (C) with the greatest fish diversity; one in deep sandy waters (D) and one in medium-depth, seagrass-free areas (E). Additionally, we detected several tropical species, suggesting poleward shifts due to rising water temperatures.
Main Conclusions: This study highlights the utility of combining marine eDNA metabarcoding with remote sensing to detect fine-scale biodiversity. The integration of machine learning enables spatial upscaling and timely responses to habitat changes, enhancing marine conservation and management. By identifying key environmental drivers of fish diversity, this approach supports proactive conservation strategies, providing a scalable model for biodiversity monitoring under climate change.
Levasseur, S., Weber de Melo, V., Lambers, J. H. R., Klausmeier, C. A., Kremer, C. T., Litchman, E., … Narwani, A. (2025). Warm-loving species perform well under limiting resources: trait combinations for future climate. Global Change Biology, 31(10), e70554 (18 pp.). doi:10.1111/gcb.70554, Institutional Repository

Ecosystems are warming alongside shifts in other abiotic factors, leading to interactive effects on populations and communities. This underscores the importance of studying how organisms respond to multiple environmental changes simultaneously. In pelagic ecosystems, as surface waters warm, longer and stronger periods of thermal stratification lead to changes in resource (light and nutrient) availability. We investigate the combined effects of temperature and resource availability on the growth rates of 19 populations (comprising 17 species) of freshwater phytoplankton in order to examine how temperature influences the minimum resource requirements (and Monod parameters) for light, nitrogen, and phosphorus. We also evaluate how resource availability affects each population's thermal traits (i.e., thermal performance curve - TPC - parameters). When averaged across all populations, the requirements for light and phosphorus tended to display a U-shaped relationship along temperatures. Individual populations varied greatly in their responses to temperature, leading to shifts in the identity of the best competitor across the thermal gradient, particularly for nitrogen and phosphorus. TPC responses to resource limitation were highly variable, but thermal optima and maxima of individual populations often decreased with resource limitation, and thermal breadths (range where growth is 80% or more of its maximum) often increased due to a flattening of TPCs. Across all populations and resource types, the maximum optimum temperature across resource levels (maximum Topt) tended to be positively correlated with the temperature at which populations had the lowest resource requirements (minimum R*). However, the temperature at which populations were the best competitors tended to be ~5°C colder on average than the temperature at which they grew the fastest. The populations with the highest thermal optima also had the lowest minimum resource requirements. Our findings reveal trait associations suggesting that some taxa already exhibit trait combinations that would support high performance under future warm and resource-limited conditions.
Vila, M., Marí-Mena, N., Vila, R., Riesgo, A., García-Souto, D., Lopez-Vaamonde, C., … Bortoluzzi, C. (2025). ERGA-BGE genome of the Spanish moon moth Actias isabellae Graells, 1849: a nocturnal lepidopteran protected by the Habitats Directive. Open Research Europe, 5, 175 (13 pp.). doi:10.12688/openreseurope.20658.2, Institutional Repository

High-quality reference genomes are critical resources for understanding biodiversity and supporting conservation efforts. We present the chromosome-level assembly of the Spanish moon moth, Actias isabellae (Graells, 1849), a nocturnal lepidopteran protected under the EU Habitats Directive. The assembly spans 0.56 Gb across 31 pseudomolecules, including the Z chromosome, with a contig N50 of 18.9 Mb and a scaffold N50 of 20.4 Mb. The mitochondrial genome was also assembled into a 15,247 bp circular sequence. Annotation identified 11,805 protein-coding genes and 2,238 non-coding genes, with a BUSCO completeness of over 94%. Notably, no W chromosome was detected, suggesting a ZZ/Z0 sex determination system. This reference genome provides an essential foundation for studying sex chromosome evolution in Lepidoptera and enables advanced population genomics monitoring of this protected species. More broadly, it contributes to ongoing efforts within the European Reference Genome Atlas and the Earth BioGenome Project to harness genomics for biodiversity conservation.

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