Marine Biology

, Volume 145, Issue 6, pp 1191–1200 | Cite as

Zooplankton biomass and indices of grazing and metabolism during a late winter bloom in subtropical waters

  • S. Hernández-León
  • C. Almeida
  • P. Bécognée
  • L. Yebra
  • J. Arístegui
Research Article

Abstract

The development of the so-called late winter bloom in subtropical water was studied in an oceanic area north of the Canary Islands from January to May 2000. Zooplankton was sampled at short-term intervals (1–4 days) during the bloom (January–March), and biomass, indices of grazing (gut fluorescence) and metabolism (electron transfer system activity, ETS) were measured in four different size fractions (100–200, 200–500, 500–1000 and >1000 µm). During the bloom, ETS activity and gut fluorescence increased before the development of zooplankton biomass. At the end of February, the presence of an impressive cloud of dust formed in the Sahara desert was related to an increase in chlorophyll and small zooplankton a week later. The increments in biomass were the consequence of consumption by zooplankton as inferred from the indices of grazing and metabolism. Estimated grazing from gut fluorescence and gut evacuation rates during the period of study accounted for 55% of the assessed total ingestion from respiration and normal values of assimilation, showing the importance of the non-pigmented food in the diet of zooplankton in these waters. In contrast, the sharp decreases in zooplankton biomass observed during the bloom appeared during the dark period of the moon, the days in which the diel vertical migrants reach the shallower layers, in agreement with previous works in the area. Thus, the development of the late winter bloom in this region is suggested to be driven by the interplay between resource and consumer controls.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • S. Hernández-León
    • 1
  • C. Almeida
    • 1
  • P. Bécognée
    • 1
  • L. Yebra
    • 1
  • J. Arístegui
    • 1
  1. 1.Biological Oceanography Laboratory, Facultad de Ciencias del MarCampus Universitario de TafiraLas Palmas de GCSpain

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