Zooplankton biomass and indices of feeding and metabolism in relation to an upwelling filament off northwest Africa
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2002
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Abstract
Zooplankton biomass and indices of grazing (gut e uorescence), respiration (electron transfer system activity, ETS) and growth (aspartate transcarbamylase, ATC) were studied in relation to an upwelling e lament off northwest Africa during August 1993. The e lament extended 150 km offshore into the oligotrophic waters. It was generated by a trapped, quasi-permanent cyclonic eddy located between the Canary Islands and the African shelf. High biomass, specie c gut e uorescence and electron transfer system activity in zooplankton were observed along the e lament structure. In contrast, low values of biomass, gut e uorescence, ETS and ATC specie c activities were found in the center of the trapped cyclonic eddy. Assuming a 50% of pigment destruction, the calculated grazing impact of zooplankton on primary production varied between 16 and 97%, a high range compared to other oceanic systems. Ingestion, estimated from indices of metabolism and growth, accounted for 47- 296% of the primary production (assuming an herbivorous feeding). Mesozooplankton trans- ported offshore into the oligotrophic area fule lled their metabolic demands with nonpigmented food as observed from the increase of omnivory from the coastal waters to the open ocean. The progressive decay of grazing and metabolic indices along the e lament suggests that advection, rather than local enrichment processes, is mostly responsible for the high biomass values in this physical structure.
| Reference Key |
openalex_W2001847098
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| Authors | Santiago Hernández‐León, Carlos Almeida, A. Portillo-Hahnefeld, May Gómez, J.M. Rodrı́guez, Javier Arı́stegui |
| Journal | journal of marine research |
| Year | 2002 |
| DOI |
10.1357/00222400260497516
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| URL | |
| Keywords | Keywords not found |
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