Autumnal deep scattering layer from moored acoustic sensing in the subtropical Canary Basin
van Haren, H. (2019). Autumnal deep scattering layer from moored acoustic sensing in the subtropical Canary Basin. Mar. Biol. (Berl.) 166(4): 43. https://dx.doi.org/10.1007/s00227-019-3491-7
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
An enhanced acoustic scatterer reflectance layer was observed in the bathypelagic zone around 1650 m in the subtropical NE-Atlantic Ocean for about 2 months during autumn. It resembles a classic pattern of diapause resting, possibly of large zooplankton, shrimp, and/or Cyclothone, at great depths well below any sunlight penetration, which is more commonly found at higher latitudes. The observed slow sink and rise of about 2–5 m per day into and out of this deep layer is considerably slower than the more than 1000 m per day of diel vertical migration (DVM). During the 2-month period of deep scattering, DVM is observed to be greatly reduced.
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