Vol 36: Vertical distribution and diel vertical migration of krill beneath snow-covered ice and in ice-free waters.Reportar como inadecuado



 Vol 36: Vertical distribution and diel vertical migration of krill beneath snow-covered ice and in ice-free waters.


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This article is from Journal of Plankton Research, volume 36.AbstractA bottom mounted upward looking Simrad EK60 120-kHz echo sounder was used to study scattering layers SLs and individuals of the krill Meganyctiphanes norvegica. The mooring was situated at 150-m depth in the Oslofjord, connected with an onshore cable for power and transmission of digitized data. Records spanned 5 months from late autumn to spring. A current meter and CTD was associated with the acoustic mooring and a shore-based webcam monitored ice conditions in the fjord. The continuous measurements were supplemented with intermittent krill sampling campaigns and their physical and biological environment. The krill carried out diel vertical migration DVM throughout the winter, regardless of the distribution of potential prey. The fjord froze over in mid-winter and the daytime distribution of a mid-water SL of krill immediately became shallower associated with snow fall after freezing, likely related to reduction of light intensities. Still, a fraction of the population always descended all the way to the bottom, so that the krill population by day seemed to inhabit waters with light levels spanning up to six orders of magnitude. Deep-living krill ascended in synchrony with the rest of the population in the afternoon, but individuals consistently reappeared in near-bottom waters already



Autor: Vestheim, Hege; R?stad, Anders; Klevjer, Thor A.; Solberg, Ingrid; Kaartvedt, Stein

Fuente: https://archive.org/







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