Benthic foraminiferal thanatocoenoses were studied in 29 sediment surface samples off NW Africa, between 19 degrees and 27 degreesN, and from water depths between 506 and 3314 m. The results were compared with estimated values of the downward organic flux and measured bottom water oxygen concentrations. Although the latter 2 parameters show a strong negative correlation in the study area, we argue that the organic flux is the main controlling ecological factor. On the basis of an R-mode multivariate statistical analysis, 6 species clusters are recognized, which are separated geographically by differences in organic flux and water depth. The combined sample scores on the first 2 principal component axes show a strong positive correlation with the estimated downward organic flux (R(2) = 0.83). It is suggested that this relationship can be used on a local scale as a proxy for paleo-export production, as long as bottom water oxygenation does not fall below a critical level.

Benthic foraminiferal faunas in surface sediments off NW Africa; relationship with the organic flux to the ocean floor

MORIGI, CATERINA;
2001-01-01

Abstract

Benthic foraminiferal thanatocoenoses were studied in 29 sediment surface samples off NW Africa, between 19 degrees and 27 degreesN, and from water depths between 506 and 3314 m. The results were compared with estimated values of the downward organic flux and measured bottom water oxygen concentrations. Although the latter 2 parameters show a strong negative correlation in the study area, we argue that the organic flux is the main controlling ecological factor. On the basis of an R-mode multivariate statistical analysis, 6 species clusters are recognized, which are separated geographically by differences in organic flux and water depth. The combined sample scores on the first 2 principal component axes show a strong positive correlation with the estimated downward organic flux (R(2) = 0.83). It is suggested that this relationship can be used on a local scale as a proxy for paleo-export production, as long as bottom water oxygenation does not fall below a critical level.
2001
Morigi, Caterina; F. J., Jorissen; A., Gervais; S., Guichard; A. M., Borsetti
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/186190
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 93
  • ???jsp.display-item.citation.isi??? 93
social impact