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Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment : the Moira Mounds (NE Atlantic)

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Abstract
Strong bottom currents play a key role in cold-water coral environments by shaping their morphology and providing the necessary food for the corals to thrive. This study investigates the differences between living and dead benthic foraminiferal assemblages in such environments, more precisely on the Moira Mounds (NE Atlantic). A specific focus is to understand the role of currents and their influence on the taphonomy of benthic foraminiferal assemblages. Here, we analyze high-resolution sediment grain size distributions coupled with benthic foraminiferal assemblage composition to assess how much deep-sea bottom currents affect benthic foraminiferal assemblages. We suggest that the dead benthic foraminiferal assemblage consists of a reworked glacial fauna associated with contemporary species. Reworked glacial species (Elphidium excavaturn, Sigmoilopsis schlumbergeri) are the most abundant. Dominant species that are present almost exclusively in the living assemblage (Alabaminella weddellensis, Nonionella iridea, Trifarina spp.) are associated with high phytodetritus input, possibly as a response to the later phase of the North-east Atlantic spring bloom. Dead assemblages are further characterized by the scarcity of organic-walled agglutinated foraminifera in comparison to living assemblages. Sediment grain size distributions show that the downslope Moira Mounds consist of well-sorted fine sand, typical of contourite deposits in the area. Grain size distributions and the average Shannon diversity of living and dead foraminiferal assemblages indicate that the coral cover offers a sheltered environment, baffling eroded sediment and preventing post-mortem transport of dead foraminifera. We conclude that cold-water coral environments provide a valuable paleoenvironmental archive by trapping sediment in an otherwise non-depositional system.
Keywords
SEASONALLY DEPOSITED PHYTODETRITUS, BATHYAL NORTHEAST ATLANTIC, PORCUPINE SEABIGHT, CARBONATE MOUND, ROCKALL TROUGH, GROWTH HISTORY, SEA, PRODUCTIVITY, BANKS, SOUTHWEST, Carbonate mounds, Taphonomy, Living vs. dead assemblages, Reworked, species, Transport

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MLA
Fentimen, Robin, et al. “Impact of Bottom Water Currents on Benthic Foraminiferal Assemblages in a Cold-Water Coral Environment : The Moira Mounds (NE Atlantic).” MARINE MICROPALEONTOLOGY, vol. 154, 2020, doi:10.1016/j.marmicro.2019.101799.
APA
Fentimen, R., Lim, A., Rueggeberg, A., Wheeler, A. J., Van Rooij, D., & Foubert, A. (2020). Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment : the Moira Mounds (NE Atlantic). MARINE MICROPALEONTOLOGY, 154. https://doi.org/10.1016/j.marmicro.2019.101799
Chicago author-date
Fentimen, Robin, Aaron Lim, Andres Rueggeberg, Andrew J. Wheeler, David Van Rooij, and Anneleen Foubert. 2020. “Impact of Bottom Water Currents on Benthic Foraminiferal Assemblages in a Cold-Water Coral Environment : The Moira Mounds (NE Atlantic).” MARINE MICROPALEONTOLOGY 154. https://doi.org/10.1016/j.marmicro.2019.101799.
Chicago author-date (all authors)
Fentimen, Robin, Aaron Lim, Andres Rueggeberg, Andrew J. Wheeler, David Van Rooij, and Anneleen Foubert. 2020. “Impact of Bottom Water Currents on Benthic Foraminiferal Assemblages in a Cold-Water Coral Environment : The Moira Mounds (NE Atlantic).” MARINE MICROPALEONTOLOGY 154. doi:10.1016/j.marmicro.2019.101799.
Vancouver
1.
Fentimen R, Lim A, Rueggeberg A, Wheeler AJ, Van Rooij D, Foubert A. Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment : the Moira Mounds (NE Atlantic). MARINE MICROPALEONTOLOGY. 2020;154.
IEEE
[1]
R. Fentimen, A. Lim, A. Rueggeberg, A. J. Wheeler, D. Van Rooij, and A. Foubert, “Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment : the Moira Mounds (NE Atlantic),” MARINE MICROPALEONTOLOGY, vol. 154, 2020.
@article{8670213,
  abstract     = {Strong bottom currents play a key role in cold-water coral environments by shaping their morphology and providing the necessary food for the corals to thrive. This study investigates the differences between living and dead benthic foraminiferal assemblages in such environments, more precisely on the Moira Mounds (NE Atlantic). A specific focus is to understand the role of currents and their influence on the taphonomy of benthic foraminiferal assemblages. Here, we analyze high-resolution sediment grain size distributions coupled with benthic foraminiferal assemblage composition to assess how much deep-sea bottom currents affect benthic foraminiferal assemblages. We suggest that the dead benthic foraminiferal assemblage consists of a reworked glacial fauna associated with contemporary species. Reworked glacial species (Elphidium excavaturn, Sigmoilopsis schlumbergeri) are the most abundant. Dominant species that are present almost exclusively in the living assemblage (Alabaminella weddellensis, Nonionella iridea, Trifarina spp.) are associated with high phytodetritus input, possibly as a response to the later phase of the North-east Atlantic spring bloom. Dead assemblages are further characterized by the scarcity of organic-walled agglutinated foraminifera in comparison to living assemblages. Sediment grain size distributions show that the downslope Moira Mounds consist of well-sorted fine sand, typical of contourite deposits in the area. Grain size distributions and the average Shannon diversity of living and dead foraminiferal assemblages indicate that the coral cover offers a sheltered environment, baffling eroded sediment and preventing post-mortem transport of dead foraminifera. We conclude that cold-water coral environments provide a valuable paleoenvironmental archive by trapping sediment in an otherwise non-depositional system.},
  articleno    = {101799},
  author       = {Fentimen, Robin and Lim, Aaron and Rueggeberg, Andres and Wheeler, Andrew J. and Van Rooij, David and Foubert, Anneleen},
  issn         = {0377-8398},
  journal      = {MARINE MICROPALEONTOLOGY},
  keywords     = {SEASONALLY DEPOSITED PHYTODETRITUS,BATHYAL NORTHEAST ATLANTIC,PORCUPINE SEABIGHT,CARBONATE MOUND,ROCKALL TROUGH,GROWTH HISTORY,SEA,PRODUCTIVITY,BANKS,SOUTHWEST,Carbonate mounds,Taphonomy,Living vs. dead assemblages,Reworked,species,Transport},
  language     = {eng},
  pages        = {14},
  title        = {Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment : the Moira Mounds (NE Atlantic)},
  url          = {http://dx.doi.org/10.1016/j.marmicro.2019.101799},
  volume       = {154},
  year         = {2020},
}

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