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Live benthic foraminiferal faunas from the French Mediterranean Coast: Towards a new biotic index of environmental quality ArchiMer
Barras, Christine; Jorissen, Frans J.; Labrune, Celine; Andral, Bruno; Boissery, Pierre.
In this study, living (Rose Bengal stained) foraminiferal faunas from 31 stations along the entire French Mediterranean Sea coast except Corsica have been analysed. In the context of the Water Framework Directive, the aim was to develop a biotic index to evaluate the benthic ecosystem quality. Therefore, different faunal parameters (diversity indices, wall structure proportion, and indicative species groups) have been tested to determine their relevance as indicators of environmental conditions. The best results are obtained with a biotic index based on the relative proportion of stress-tolerant taxa. For ecosystem quality evaluation, it is essential to distinguish between natural and anthropogenic eutrophication phenomena. In order to do so, we applied a...
Tipo: Text Palavras-chave: Coastal Mediterranean Sea; Foraminiferal faunas; Indicative species; Tolerant species; Biotic index; Water Framework Directive.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00162/27312/28371.pdf
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Temperature calibration of Mg/Ca ratios in the intermediate water benthic foraminifer Hyalinea balthica ArchiMer
Rosenthal, Yair; Morley, Audrey; Barras, Christine; Katz, Miriam E.; Jorissen, Frans; Reichart, Gert-jan; Oppo, Delia W.; Linsley, Braddock K..
Core top samples from Indonesian and northeast Atlantic depth transects were used to calibrate Mg/Ca and delta O-18 in tests of the calcitic benthic foraminifer Hyalinea balthica to bottom water temperature between 4 degrees C and 13 degrees C. This shallow infaunal species is primarily abundant in neritic to upper bathyal sediments (< 600 m). Both linear and exponential calibrations suggest a temperature sensitivity of similar to 12% per degrees C that is similar to 4 times higher than observed in other species of deep-sea benthic foraminifera. Culture experiments support the core top calibration. We find no discernible effect of salinity and saturation on Mg/Ca. Comparison between the measured benthic foraminiferal delta O-18 and predicted equilibrium...
Tipo: Text Palavras-chave: Mg/Ca; Benthic foraminifera; Temperature calibration; Isotope.
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00215/32579/33686.pdf
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