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Title: Large mesopelagic fishes biomass and trophic efficiency in the open ocean
Authors: Irigoien, Xabier
Klevjer, T. A.
Røstad, A.
Martinez, U.
Boyra, G.
Acuña, J. L.
Bode, A.
Echevarria, F.
Gonzalez-Gordillo, J. I.
Hernandez-Leon, S. 
Agusti, S.
Aksnes, D. L.
Duarte, C. M.
Kaartvedt, S.
Agusti, S. 
UNESCO Clasification: 240119 Zoología marina
251001 Oceanografía biológica
Keywords: Mesopelagic fishes
Marine Ecosystems
Target Strength
Family Myctophidae
Stenobrachius-Leucopsarus, et al
Issue Date: 2014
Project: Expedición de Circunnavegación Malaspina 2010: Cambio Global y Exploración Del Océano Global 
Journal: Nature Communications 
Abstract: With a current estimate of ~1,000 million tons, mesopelagic fishes likely dominate the world total fishes biomass. However, recent acoustic observations show that mesopelagic fishes biomass could be significantly larger than the current estimate. Here we combine modelling and a sensitivity analysis of the acoustic observations from the Malaspina 2010 Circumnavigation Expedition to show that the previous estimate needs to be revised to at least one order of magnitude higher. We show that there is a close relationship between the open ocean fishes biomass and primary production, and that the energy transfer efficiency from phytoplankton to mesopelagic fishes in the open ocean is higher than what is typically assumed. Our results indicate that the role of mesopelagic fishes in oceanic ecosystems and global ocean biogeochemical cycles needs to be revised as they may be respiring ~10% of the primary production in deep waters.
ISSN: 2041-1723
DOI: 10.1038/ncomms4271
Source: Nature communications [ISSN 2041-1723], v. 5, p. 3271
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