||2:00pm Feb 19, 2020
CNRS/Université de Nantes, France
Community networks reveal the structuring of plankton in the global ocean
Marine plankton forms complex communities of interacting organisms at the basis of the food web, sustaining Earth’s biogeochemical cycles in the ocean, and regulating our climate. From the equator to the poles, plankton is adapted to specific environmental conditions at the molecular and cellular levels. However, it is unclear how microbial community structures and associated processes will be affected by environmental change. Leveraging Tara Oceans sampling across all major oceanic provinces including the Panarctic Ocean, we inferred a global ocean cross-kingdom plankton ecological network from deep-sequencing data. This interactome is structured across biomes with higher connectivity at the poles. Through plankton tolerance range inference, we simulated environmental variations onto the network to assess ecosystems structure stability to environmental change. We predict biome-specific sensitivities of the plankton interactome to temperature and nutrient concentrations changes, which inform us about potential mechanisms and functions associated to sentinels of environmental change for global ocean monitoring.