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Copepod manipulation of oil droplet size distribution
Summary
Researchers discovered that a type of tiny marine crustacean called a copepod can physically break large oil droplets into smaller ones through feeding movements and digestion, potentially spreading oil spill contamination more widely through ocean food webs. This finding reveals an underappreciated biological mechanism that could influence how oil — and by extension, other pollutants like microplastics — moves through marine ecosystems.
Oil spills are one of the most dangerous sources of pollution in aquatic ecosystems. Owing to their pivotal position in the food web, pelagic copepods can provide crucial intermediary transferring oil between trophic levels. In this study we show that the calanoid Paracartia grani can actively modify the size-spectrum of oil droplets. Direct manipulation through the movement of the feeding appendages and egestion work in concert, splitting larger droplets (Ø = 16 µm) into smaller ones (Ø = 4-8 µm). The copepod-driven change in droplet size distribution can increase the availability of oil droplets to organisms feeding on smaller particles, sustaining the transfer of petrochemical compounds among different compartments. These results raise the curtain on complex small-scale interactions which can promote the understanding of oil spills fate in aquatic ecosystems.
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