Phosphorus (P) is crucial for phytoplankton growth, but it's often limited in some ocean areas. Studies show that dinoflagellates can adapt well, using dissolved organic phosphorus (DOP) when P is scarce. This study examines how the dinoflagellate Gymnodinium impudicum, commonly linked to coastal blooms, responds physiologically and molecularly to P deficiency, emphasizing its DOP utilization strategies.