Climate change has significantly altered the spatiotemporal distribution and phenology of marine organisms, yet the long‐term trends and mechanisms driving these changes remain insufficiently understood. In this study, we analysed historical Noctiluca scintillans bloom data from coastal China (1933, 1952, 1981–2023), sea surface temperature (SST) records from the past 40 years, and 509 field samples using Single Molecule Real‐...