Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA

13 pages, 8 figures, 1 table

Detalles Bibliográficos
Autores: Scharek, Renate, Tupas, Luis M., Karl, David M.
Tipo de recurso: artículo
Fecha de publicación:1999
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/184131
Acceso en línea:http://hdl.handle.net/10261/184131
Access Level:acceso abierto
Palabra clave:Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
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spelling Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA Scharek, Renate Tupas, Luis M. Karl, David M. Biogenic silica Bottom-moored sediment traps Deep Sea Diatoms Vertical particle flux 13 pages, 8 figures, 1 table Planktonic diatoms are important agents of vertical transport of photosynthetically fixed organic carbon to the ocean's interior and seafloor. Diatom fluxes to the deep sea were studied for 2 yr using bottom-moored sequencing sediment traps located in the vicinity of the Hawaii Ocean Time-series (HOT) program station 'ALOHA' (22°45'N, 158°W). The average flux of empty diatom frustules was around 2.8 x 105 cells m-2 d-1 in both years, except in late summer when it increased approximately 30-fold. Flux of cytoplasm-containing diatom cells was much lower (about 8 x 103 cells m-2 d-1) but increased 500-fold in late July 1992 and 1250-fold in August 1994. Mastogloia woodiana Taylor, Hemiaulus hauckii Grunow and Rhizosolenia cf. clevei var. communis Sundstrom were the dominant diatom species observed during the July 1992 event, with the former 2 species again dominant in August 1994. The 1994 summer flux event occurred about 3 wk after a documented bloom of H. hauckii and M. woodiana in the mixed-layer and a simultaneous increase in vertical flux of these species. This surface flux signal was clearly detectable at 4000 m, suggesting rapid settling rates. A further indication of very high sinking speeds of the diatoms was the much larger proportion of cytoplasm-containing cells in the bottom-moored traps during the 2 summer events. Cells of H. hauckii and R. cf. clevei var. communis frequently contained endosymbiotic cyanobacteria with heterocysts (cf. Richelia), similar to the cells of these species in the mixed-layer. Our data show for the first time that diatoms containing nitrogen-fixing cyanobacteria contribute directly to the vertical flux of organic matter to the deep sea in the oligotrophic regions. The peak of diatom flux coincided with a significant flux increase of biogenic silica in both years. During periods of rapid sinking, the vertical flux of diatom assemblages out of the uppermost water column seems to be more important than the diatom flux out of the deep chlorophyll maximum layer (DCML). Aggregate formation may be responsible for the fast sinking of the diatoms Peer Reviewed Inter Research http://hdl.handle.net/10261/184131
title Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
spellingShingle Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
Scharek, Renate
Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
title_short Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
title_full Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
title_fullStr Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
title_full_unstemmed Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
title_sort Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
author Scharek, Renate
author_facet Scharek, Renate
Tupas, Luis M.
Karl, David M.
author_role author
author2 Tupas, Luis M.
Karl, David M.
author2_role author
author
topic Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
topic_facet Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
description 13 pages, 8 figures, 1 table
publishDate 1999
format article
url http://hdl.handle.net/10261/184131
eu_rights_str_mv openAccess
publisher Inter Research
institution Consejo Superior de Investigaciones Científicas (CSIC)
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
_version_ 1878440563706953728
publishDateSort 1999
author_browse Karl, David M.
Scharek, Renate
Tupas, Luis M.
publisherStr Inter Research
score 6,9303427

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