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JPR Advance Access published online on December 16, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh166
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Journal of Plankton Research, © Oxford University Press 2004; all rights reserved
Received July 9, 2004
Accepted November 25, 2004

Article

A global assessment of mesozooplankton respiration in the ocean

Santiago Hernández-León 1* and Tsutomu Ikeda 2

1 Biological Oceanography Laboratory, Facultad de Ciencias del Mar, Campus Universitario de Tafira, 35017 Las Palmas de GC, Canary Islands, Spain
2 Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041-0821, Japan

* To whom correspondence should be addressed.
Santiago Hernández-León, E-mail: shernandez{at}dbio.ulpgc.es


  Abstract

Published data on the biomass and specific respiration rates of mesozooplankton in the oceans across all latitudes were combined to assess their community respiration on a global basis. Mesozooplankton biomass was higher in boreal/anti-boreal and polar waters, intermediate in equatorial waters, and lowest in the subtropical gyres. Specific respiration rates were the highest in equatorial waters and decreased rapidly poleward. Global community respiration of mesozooplankton in the upper 200 m of the oceans, integrated over all latitudes was 10.4 ±3.7 (SE) GtC yr-1 (n=838). Below the epipelagic zone, mesozooplankton respiration living in the mesopelagic (200-1000 m) and bathypelagic (below 1000 m) zones was estimated as 2.2 ±0.4 (n=57) and 0.40 ±0.2 (n=12) GtC yr-1, respectively. Thus, global depth integrated mesozooplankton respiration was 13.0 ±4.2 GtC yr-1 (17-32% of global primary production), which is 3 to 8-fold higher than the values assigned to mesozooplankton respiration in recent estimates of total respiration in the ocean. Thus, it appears that mesozooplankton represent a major, but neglected component of the carbon cycle in the ocean.


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