Volta

Warming simplifies marine ecological networks through losses in trophic and non-trophic interactions

Ocean warming is anticipated to push many marine species beyond their physiological limits, leading to shifts in community composition and ecological interactions. Coastal upwelling can provide temporary relief from heat stress but may also introduce challenges due to temporal hypoxia and acidification. As environmental extremes become more frequent and prolonged, understanding their impact on coastal ecosystems is critical. To examine how warming and upwelling influence trophic and non-trophic network complexity, we quantified trophic group biomasses and ecological network properties in benthic mesocosm communities. Over a 4.5 mo summer period, seawater temperatures were experimentally manipulated, ranging from ambient conditions to +5°C above ambient, and further crossed with transient upwelling events. The most striking result was that total biomass was about 50% …

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