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

13 pages, 8 figures, 1 table

Detalhes bibliográficos
Autores: Scharek, Renate, Tupas, Luis M., Karl, David M.
Formato: artículo
Fecha de publicación:1999
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/184131
Acesso em linha:http://hdl.handle.net/10261/184131
Access Level:acceso abierto
Palavra-chave: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 ALOHAScharek, RenateTupas, Luis M.Karl, David M.Biogenic silicaBottom-moored sediment trapsDeep SeaDiatomsVertical particle flux13 pages, 8 figures, 1 tablePlanktonic 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 diatomsPeer ReviewedInter Research2019201919992019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/184131reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.3354/meps182055info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1841312026-05-22T06:33:51Z
dc.title.none.fl_str_mv Diatom fluxes to the deep sea in the oligotrophic North Pacific gyre at Station ALOHA
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
dc.creator.none.fl_str_mv Scharek, Renate
Tupas, Luis M.
Karl, David M.
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
dc.subject.none.fl_str_mv Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
topic Biogenic silica
Bottom-moored sediment traps
Deep Sea
Diatoms
Vertical particle flux
description 13 pages, 8 figures, 1 table
publishDate 1999
dc.date.none.fl_str_mv 1999
2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/184131
url http://hdl.handle.net/10261/184131
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.3354/meps182055
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Inter Research
publisher.none.fl_str_mv Inter Research
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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