If you follow a whale around the open ocean, this is what you see: They travel thousands of miles, burn through fat, and – in the form of pee – leave behind a trail of nutrients that help entire ocean ecosystems survive. Turns out, these bathroom breaks are doing a lot more than relieving pressure.
A new study published in Nature Communications found that large whales — including humpbacks, grays, and right whales — are carrying thousands of tons of nitrogen from polar feeding grounds to tropical waters each year, Popular Science reported. Along the way, they are quietly fertilizing coral reefs and coastal ecosystems that would otherwise deplete essential nutrients.
Scientists have dubbed this process the “big whale pee funnel,” and it’s exactly what it sounds like: an ocean-wide transfer system that starts when whales mass in the Arctic and ends when they’re released in the tropics. The research team estimates that it releases more than 4,000 tons of nitrogen each year, mostly in the form of urea-rich urine.
This new knowledge builds on a 2010 discovery known as the “whale pump,” a system in which whales feed in deep waters and then scum near the surface, pushing nutrients up toward the plankton.
“But we quickly realized that this was only part of the story,” Joe Roman, co-author of the study and a conservation biologist at the University of Vermont, told Popular Science. “Baleen whales are ‘breeding capitals’, feeding for part of the year in productive high-latitude areas, such as Alaska, and calving and nursing during the winter in areas such as Hawaii, where [they] typically fast.”
During fasting, migrating whales burn hundreds of pounds of fat per day. That metabolic breakdown results in large volumes of nitrogen-rich urine. Fin whales near Iceland, for example, can produce more than 250 gallons of pee a day, according to the Orkney Marine Mammal Research Initiative, compared to less than half a gallon for humans.
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All that liquid gold ends up in the ocean, where it fuels the growth of algae, plankton, and coral, especially in places that struggle with nutrient deficiencies.
Humpbacks migrating from Antarctica to Costa Rica leak urea all the way, connecting ecosystems thousands of miles apart. In total, whales move more than 45,000 tonnes of biomass per year, an astonishing figure that rivals some of the ocean’s largest natural upwelling systems. In regions where they pass through, available nitrogen levels can more than double.
Before commercial whaling decimated global populations, these interhemispheric nutrient flows may have been up to three times greater. Rebuilding whale numbers, Roman believes, is more than conservation, it’s about restoring a planetary system. “We often think of plants as the lungs of the planet,” he said. “Animals are the circulatory system.”
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