Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9479732 | Deep Sea Research Part I: Oceanographic Research Papers | 2005 | 15 Pages |
Abstract
The vertical distribution (0-900Â m) of zooplankton biomass and indices of feeding (gut fluorescence, GF) and metabolism (electron transfer system, ETS) were studied across an anticyclonic eddy south of Gran Canaria Island (Canary Islands). Two dense layers of organisms were clearly observed during the day, one above 200Â m and the other at about 500Â m, coincident with the deep scattering layer (DSL). The biomass displacement due to interzonal migrants in the euphotic zone was more than 2-fold higher than that previously reported for the southern area of this archipelago. The gut flux estimated (0.14-0.44Â mgCÂ mâ2Â dâ1) was similar to the values previously found in the Canaries. The respiratory flux outside the eddy (1.85Â mgCÂ mâ2Â dâ1) was in the lower range of values reported for this area. Inside the eddy, migrant biomass and respiration rates were 2- and 4- fold higher than in the surrounding waters. Active flux mediated by diel vertical migrants inside the eddy (8.28Â mgCÂ mâ2Â dâ1) was up to 53% of the passive carbon flux to the mesopelagic zone (15.8Â mgCÂ mâ2Â dâ1). It is, therefore, suggested that the anticyclonic eddy enhanced both migration from deep waters and active flux.
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Authors
L. Yebra, C. Almeida, S. Hernández-León,