| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Stable isotopes in deep-sea living (stained) foraminifera from the Mozambique Channel (eastern Africa): multispecies signatures and paleoenvironmental application
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| Autores: |
Fontanier, Christophe
Sakai, Saburo
Toyofuku, Takashi
Garnier, Eline
Brandily, Christophe
Eugene, Thibaut
Deflandre, Bruno
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| Data: |
2017-04
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| Ano: |
2017
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| Palavras-chave: |
Oxygen and carbon isotopes
Deep-sea foraminifera
Organic matter
Oxygenation
Microhabitat
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| Resumo: |
Oxygen and carbon isotopes (δ18O and δ13C) have been investigated in carbonate tests of deep-sea foraminifera living in the Mozambique Channel (eastern Africa) to understand how environmental constraints (e.g., organic matter, oxygenation) control the intra- and interspecific variability of isotopic signatures. 197 living individuals, including eight different species, from various microhabitats within the sediment were sorted from sediment samples gathered at two stations on the Malagasy upper slope. Results show that the δ18O values of foraminiferal taxa were not controlled by microhabitat pattern. They presented tremendous and intriguing intraspecific variability that is not explained by the classical ontogenetic effect. The δ13C values of infaunal foraminiferal taxa do not show a 1:1 relationship with the bottom water δ13C DIC and do not present a constant offset from it; instead, they appear to be mainly controlled by a microhabitat effect. The lower δ13C values of shallow, intermediate, and deep infaunal taxa at the deeper station compared to those seen at the shallower station reflect the enhanced exportation of sedimentary organic matter at the sediment–water interface, and its related mineralization within the upper sediments. The ∆δ13C between shallow/very shallow infaunal species (i.e., Hoeglundina elegans, Uvigerina hispida) and intermediate/deep infaunal species (i.e., Melonis barleeanus, Globobulimina barbata) permits insight into (1) the exportation of organic matter to the seafloor and (2) the various degradation pathways for organic detritus in the benthic environments off NW Madagascar.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00357/46831/46979.pdf
DOI:10.1007/s10872-016-0401-1
http://archimer.ifremer.fr/doc/00357/46831/
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| Editor: |
Springer
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| Formato: |
application/pdf
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| Fonte: |
Journal Of Oceanography (0916-8370) (Springer), 2017-04 , Vol. 73 , N. 2 , P. 259-275
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| Direitos: |
The Oceanographic Society of Japan and Springer Japan 2016
info:eu-repo/semantics/openAccess
restricted use
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