can limit marine productivity and affect ecosystem structure. Over recent decades, a wealth
of new knowledge has revolutionized our understanding of the marine P cycle. With a
revised residence time (~ 10–20 kyr) that is similar to nitrate and a growing awareness that P
transformations are under tight and elaborate microbial control, the classic textbook version
of a tectonically slow and biogeochemically simple marine P cycle has become outdated. P …