Water-column integrated measurements of natural abundance of stable carbon and nitrogen isotopes in seston, sediment trap particles and in four plankton size-fractions (200-5000µm) in montlhy samples collected in a shelf station off A Coruña (NW Spain) between 2010 and 2011.

1) seston and sedimented particles C:N, stable isotopes: discrete samples (Niskin bottles) at 0, 5, 10, 20, 30, 40 and 70m. filtration (Whatman GF/F), drying (60°C) and analysis in elemental analyzer coupled to isotope-ratio mass spectrometer. Weight-averaged in the water-column (Fernández et al., 2014; doi:10.1093/plankt/fbu041)2) plankton C:N, stable isotopes: integrated samples (double-oblique hauls of 50cm-diameter Juday-Bogorov net, 200µm mesh-size), fractionation with sieves (200, 500, 100, 2000, 5000µm), drying (60°C) and analysis in elemental analyzer coupled to isotope-ratio mass spectrometer (Bode and Álvarez-Ossorio, 2004; doi:10.1016/j.icesjms.2004.03.004)3) sedimented particles: particle interceptor trap of 6 cm diameter deployed for 24 h at 50 m depth (Bode et al., 1998; doi:10.1017/S0025315400039928)