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Title: Top-down effects and carbon flux in the ocean: A hypothesis
Authors: Hernández-León, Santiago 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Subtropical
Carbon flux
Issue Date: 2009
Publisher: 0924-7963
Project: Conafrica: la Conexion Africana en la Corriente de Canarias 
Journal: Journal of Marine Systems 
Abstract: The close relationships between mesozooplankton, chlorophyll, and primary production normally observed across latitudes may be regarded as a bottom-up effect of increased productivity or, conversely, as a top-down effect of mesozooplankton on microzooplankton, releasing phytoplankton growth. The time-course of primary producers and mesozooplankton observed during the Late Winter Bloom in subtropical waters suggests a top-down effect, similar to the results found in lakes and mesocosm experiments. Two scenarios were observed during the development of the bloom in the Canary Island waters. The first was the increase in mesozooplankton as the effect of higher primary production due to mixing. The second scenario was the decrease in mesozooplankton due to the top-down effect of predation by diel vertical migrants upon epipelagic mesozooplankton. The structure of the food web in the euphotic zone was different depending on the presence or not of mesozooplankton, suggesting important consequences for the transport of carbon in those large areas of the ocean.
ISSN: 0924-7963
DOI: 10.1016/j.jmarsys.2009.01.001
Source: Journal of Marine Systems [ISSN 0924-7963], v. 78, p. 576-581
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