Phosphorus deficiency restructures planktonic food webs via size-dependent baseline decoupling

Title: Phosphorus deficiency restructures planktonic food webs via size-dependent baseline decoupling Dongyoung Kim1, Hui Tae Joo2, Seok-Hyun Youn2, Jeong Hee Shim2, Hyun Je Park 1,* 1 Department of Marine Convergence Science, Kangwon National University, Gangneung 25457, Republic of Korea2 Ocean Climate and Ecology Research Division, National Institute of Fisheries Science, Busan 46083, Republic of Korea This dataset contains seasonal (2022) vertical profiles (0–100 m) of dissolved inorganic nutrients along the Tsushima Warm Current pathway across five stations from the northern East China Sea to the southwestern East Sea. It also includes size-fractionated stable isotope ratios (δ13C and δ15N) of depth-integrated (upper 50 m) coarse (>20 μm) and fine (<20 μm) particulate organic matter (POM). Detailed field and analytical methods are described in the associated manuscript and its Supporting Information. Data Sheet Descriptions[Sheet 1: Physicochemical data]- Region: sampling location covering the East/Japan Sea (EJS), South Sea of Korea (SS), and East China Sea (ECS). - Sampling depth (m) : Discrete water sampling depths (0, 10, 20, 30, 50, 75, 100 m)- Ammonium (μM): NH4+ concentration- Nitrite (μM): NO2- concentration- Nitrate (μM): NO3- concentration- DIN (μM): Dissolved Inorganic Nitrogen (NO3- + NO2- + NH4+)- DIP (μM): Dissolved Inorganic Phosphorus (PO43-)- DSi (μM): Dissolved Silicate (Si(OH)4)- N:P: Atomic DIN to DIP ratio- Si:P: Atomic DSi to DIP ratio [Sheet 2: POM isotope]- CPOM δ13C (‰) : Stable carbon isotope ratio of coarse POM (>20 μm, 0–50 m depth-integrated) vs. VPDB- CPOM δ15N (‰) : Stable nitrogen isotope ratio of coarse POM (>20 μm, 0–50 m depth-integrated) vs. atmospheric N2- FPOM δ13C (‰) : Stable carbon isotope ratio of fine POM (<20 μm, 0–50 m depth-integrated) vs. VPDB- FPOM δ15N (‰) : Stable nitrogen isotope ratio of fine POM (<20 μm, 0–50 m depth-integrated) vs. atmospheric N2