Downward transport of organic carbon by diel migratory micronekton in the western equatorial Pacific:: its quantitative and qualitative importance |
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| Institution: | 1. Instituto de Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, Campus de Taliarte, 35214, Telde, Gran Canaria, Canary Islands, Spain;2. Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto Pesquero s/n, 29640, Fuengirola, Málaga, Spain;3. Facultad de Ciencias del Mar, Departamento de Física, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, Edificio de Ciencias Básicas, 35017 Las Palmas de Gran Canaria, Spain |
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| Abstract: | Using simultaneous sampling with a commercial-sized trawl, a zooplankton net, and a sediment trap, we evaluated the contribution of vertically migrating micronekton to vertical material transport (biological pump) at two stations (3°00′N, 146°00′E and 3°30′N, 145°20′E) in the western equatorial North Pacific. The gravitational sinking particulate organic carbon flux out of the euphotic zone was 54.8 mg C m?2 day?1. The downward active carbon flux by diel migrant mesozooplankton was 23.53 and 9.97 mg C m?2 day?1, and by micronekton 4.40 and 2.26mg C m?2 day?1 at the two stations. Assuming that the micronekton sampling efficiency of the trawl was 14%, we corrected the downward carbon flux due to micronekton respiration to 29.9 and 15.2mg C m?2 day?1, or 54.6 and 27.7% of the sinking particle flux at the two stations. The corrected micronekton gut fluxes were 1.53 and 0.97mg C m?2 day?1. The role of myctophid fish fecal matter as a possible food resource for deep-sea organisms, based on its fatty acid and amino acid analysis, is discussed. |
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