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These pigments provide a measure to estimate the flux of primary organic matter to the seafloor. The depth transect in the Porcupine Seabight is compared with similar transects off Portugal and north Morocco. All three transects revealed major decreases in meiofaunal density and biomass between 500 m and 1,500 m, roughly equivalent to the archibenthic zone, and also between the continental rise and the abyssal plain. 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