Scientists discover hidden food source in deep ocean
Marine snow particles found to release nutrients under pressure
1Surprising discovery in deep seas
Researchers at the University of Southern Denmark have uncovered an unexpected food source for microorganisms in deep oceans. Tiny sinking particles called 'marine snow' release dissolved carbon and nitrogen as they descend. These nutrients become immediately available for surrounding microbes.
2Works like a giant juicer
The study reveals that when marine snow reaches depths of 2-6 kilometers, hydrostatic pressure acts like a massive fruit press. This enormous pressure forces organic matter out of the particles. Lead author Peter Stief explains that this process provides ready-to-use nutrients for microorganisms.
3Could reshape carbon cycle understanding
The discovery may transform our knowledge of Earth's carbon cycle. Traditionally, most carbon carried by marine snow was thought to be buried in seafloor sediments. New findings show much of this carbon remains suspended in deep ocean waters instead.
4Marine snow simulation in lab
Scientists recreated the process using microscopic algae called diatoms in specially designed pressure tanks. Experiments showed particles lose up to half their carbon content while sinking. Most released material consists of proteins and carbohydrates easily consumed by microbes.
5Microbes respond rapidly
Leaked nutrients fuel rapid microbial growth. Bacterial abundance increased 30-fold within just two days, with respiration rates rising significantly. These results prove marine snow serves as a crucial energy source for deep-sea microorganisms.
6Important implications for climate models
The discovery raises new questions about how much carbon oceans can store and for how long. Peter Stief emphasizes these findings are crucial for understanding climate processes and improving future models. The team now plans to investigate natural traces of this process.