Comme quoi, l’arrivée d’une petite moule peut faire basculer le monde | Carole Fonty | TEDxGeneva

Quick Overview

The small mussel, Mytilus galloprovincialis, possesses the extraordinary capacity to filter massive volumes of water, removing pollutants and thus playing a critical, often undervalued, role in maintaining the health of aquatic ecosystems like the Great Lakes, which is why its introduction or sudden proliferation can significantly impact the entire ecosystem structure and function.

Key Points: The Mediterranean mussel, Mytilus galloprovincialis, was introduced to the Great Lakes and is capable of filtering up to 1 million larvae per adult mussel per year. The speaker argues that the sheer volume of water filtered (equivalent to 600 battleships) and the mussel's ability to colonize surfaces cause a cascade effect, threatening native species like the dreissenid mussels (zebra and quagga mussels) and fish populations. The invasive nature of the Quagga mussel is linked to its filtration capacity, which reduces phytoplankton, the base of the aquatic food web, leading to a decline in fish populations. The speaker advocates for shifting focus from managing the invasive species (eradication) to accepting the chaos and fostering resilience through ecosystem restoration and systemic solutions. The speaker cites an observation from 2007 in Lake Michigan where the massive die-off of these mussels led to a decrease in oxygen levels at the bottom of the lake, threatening other benthic life. Solutions involve leveraging the mussel's filtering capabilities for beneficial purposes, such as developing AI algorithms to assess water quality and promote regenerative filtration, rather than trying to eliminate them. The speaker concludes that instead of viewing the invasive species as a pure threat, we must recognize its role and work collaboratively with public and private partners to create a resilient, regenerative future.

Context: Carole Fonty delivers this TEDxGeneva talk, themed 'CHAOS - 28 NOVEMBRE 2025,' focusing on the ecological impact of invasive mussels, specifically Mytilus galloprovincialis (Mediterranean mussel) and the related Dreissena species (zebra and quagga mussels). She details how these small organisms, through their massive filtration capacity, fundamentally alter aquatic ecosystems, forcing a necessary shift in environmental management strategy from eradication to adaptation and regeneration.