How the oceans' most abundant bacteria impact global nutrient flows

If you were to collect all the organisms from the ocean surface down to 200 meters, you'd find that SAR11 bacteria, though invisible to the naked eye, would make up a fifth of the total biomass. These bacteria, also known as Pelagibacterales, have evolved to thrive in nutrient-poor marine environments and play a significant role in global nutrient cycles. Despite their importance, the mechanisms behind their impact on the planetary ecosystem have remained unclear. But now, a recent article sheds light on a crucial aspect of these bacteria.