|The deep-sea meiofauna of the Porcupine Seabight and abyssal plain (NE Atlantic): population structure, distribution, standing stocks|
Pfannkuche, O. (1985). The deep-sea meiofauna of the Porcupine Seabight and abyssal plain (NE Atlantic): population structure, distribution, standing stocks. Oceanol. Acta 8(3): 343-353
In: Oceanologica Acta. Elsevier/Gauthier-Villars: Montreuil. ISSN 0399-1784, more
Abundance; Abyssal zone; Biomass; Chloroplasts; Correlation analysis; Meiobenthos; Photosynthetic pigments; Sediments; Metazoa; Marine
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With increasing depth the total metazoan meiofaunal abundance declined from 2 604 to 315 individuals per 10 cm-2 and the biomass from 1.16 to 0.35 mg per 10 cm -2 (ash-free dry weight). This depth-related decrease in standing stock was significantly correlated with the amounts of sediment-bound chloropastic pigments (chlorophyll a, pheopigments) in a parallel set of samples. 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. Between 2000 m and 4000 m, however, the standing stock decreased only slightly.