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Benthic foraminifera in a deep-sea high-energy environment: the Moira Mounds (Porcupine Seabight, SW of Ireland)

  • Fentimen, Robin Department of Geosciences, University of Fribourg, Switzerland
  • Rüggeberg, Andres Department of Geosciences, University of Fribourg, Switzerland
  • Lim, Aaron School of Biological, Earth and Environmental Sciences, University College Cork, Ireland
  • El Kateb, Akram Department of Geosciences, University of Fribourg, Switzerland
  • Foubert, Anneleen Department of Geosciences, University of Fribourg, Switzerland
  • Wheeler, Andrew J. School of Biological, Earth and Environmental Sciences, University College Cork, Ireland - Irish Centre for Research in Applied Geosciences, University College Cork, Ireland
  • Spezzaferri, Silvia Department of Geosciences, University of Fribourg, Switzerland
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    01.10.2018
Published in:
  • Swiss Journal of Geosciences. - 2018, vol. 111, no. 3, p. 561–572
English Cold-water coral ecosystems represent unique and exceptionally diverse environments in the deep-sea. They are well developed along the Irish margin, varying broadly in shape and size. The Moira Mounds, numerous small-sized mounds, are nestled in the Belgica Mound Province (Porcupine Seabight, North-East Atlantic). The investigation of living (Rose Bengal stained) and dead benthic foraminiferal assemblages from these mounds allowed to describe their distribution patterns and to evaluate their response to environmental variability. Quantitative data was statistically treated to define groups of species/genera associated to specific habitats. The Moira Mounds differ from their larger neighbours by the reduced spatial variability of benthic foraminiferal assemblages, living assemblages only distinguishing coral-rich and coral-barren areas. The ecological needs of corals are highlighted by the abundance of Alabaminella weddellensis and Nonionella iridea, phytodetritus-feeding species in coral supporting sediments. Living foraminifera in sediments from the Moira Mounds concentrate in the upper first centimetre. Infaunal species may be affected by bioturbation and/or reworking by the strong currents in the area. Dead foraminiferal assemblages from the Moira Mounds resemble those described for the sandwave facies in adjacent giant mounds, suggesting similar processes in facies deposition.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Geology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307325
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