Phosphorus limitation heightens vulnerability of Crocosphaera watsonii to ocean warming compared with iron limitation

Given predicted sea temperature increases and the rising frequency and intensity of oceanic heat waves, our results suggest that <i>C. watsonii</i> in P-limited regimes like the North Atlantic may be more vulnerable to warming than in Fe-limited regimes like the North Pacific. P-limitation may force <i>C. watsonii</i> to migrate to higher, cooler latitudes for survival, possibly leaving lower-latitude phytoplankton and ecosystems more vulnerable to nitrogen limitation.