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BENTHIC FORAMINIFERAL TRENDS IN RELATION TO AN ORGANIC ENRICHMENT GRADIENT ON THE CONTINENTAL SLOPE (850 M WATER DEPTH) OFF NORTH CAROLINA (USA)

2006; Cushman Foundation for Foraminiferal Research; Volume: 36; Issue: 1 Linguagem: Inglês

10.2113/36.1.34

1943-264X

Christopher Smart, Andrew J. Gooday,

Marine and coastal plant biology

Research Article| January 01, 2006 BENTHIC FORAMINIFERAL TRENDS IN RELATION TO AN ORGANIC ENRICHMENT GRADIENT ON THE CONTINENTAL SLOPE (850 M WATER DEPTH) OFF NORTH CAROLINA (USA) Christopher W. Smart; Christopher W. Smart 1School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, United Kingdom. E-mail: csmart@plymouth.ac.uk Search for other works by this author on: GSW Google Scholar Andrew J. Gooday Andrew J. Gooday 2National Oceanography Centre, Southampton, Empress Dock, European Way, Southampton, Hampshire, SO14 3ZH, United Kingdom Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (2006) 36 (1): 34–43. https://doi.org/10.2113/36.1.34 Article history received: 04 Oct 2004 accepted: 15 Sep 2005 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher W. Smart, Andrew J. Gooday; BENTHIC FORAMINIFERAL TRENDS IN RELATION TO AN ORGANIC ENRICHMENT GRADIENT ON THE CONTINENTAL SLOPE (850 M WATER DEPTH) OFF NORTH CAROLINA (USA). Journal of Foraminiferal Research 2006;; 36 (1): 34–43. doi: https://doi.org/10.2113/36.1.34 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract We analyzed benthic foraminiferal assemblages in core samples collected by a submersible at three sites (I, II, III) along an isobathyal gradient of organic enrichment on the North Carolina slope (850 m water depth). The 0–2, 2–5, 5–10, 10–15 cm layers of each core were sieved into 63–125, 125–150 and 150–300 μm size fractions, and each fraction was stained with rose Bengal and dry sorted. Together, the samples yielded 284 benthic foraminiferal species. The vast majority of tests (97%) were unstained; live specimens were scarce at Site I and very rare at Site II, but more common at Site III. The preservation of dead calcareous benthic and planktonic foraminiferal tests varied between sites. Calcareous tests were abundant at Sites I and II, but virtually absent at Site III except in the 2–5 cm layer, where they were more numerous than at the other two sites. Dead benthic tests were also less abundant in the 0–2 cm, 5–10 cm and particularly the 10–15 cm layers at Site III than in the corresponding layers at Sites I and II, and were dominated by species with agglutinated rather than calcareous walls. These patterns suggest that substantial dissolution has occurred at Site III. In striking contrast, the 2–5 cm layer of our Site III core yielded numerous calcareous planktonic and benthic foraminiferal tests. Possibly, this layer consisted of sediment that had been transported by a local mass movement event. In general, diversity trends exhibited by the dead assemblages (63–300 and 63–125 μm fractions) were similar to those reported by Gooday and others (2001) for the live metazoan and foraminiferal macrofauna (>300 μm): diversity and species richness were higher at Sites I and II than at the organically enriched Site III; dominance was higher at Site III than at the other two sites. However, at Site III, diversity was apparently depressed by the destruction of calcareous foraminiferal tests. Some species (Angulogerina angulosa, Bolivina paula, Bulimina aculeata, Cibicidoides pseudoungerianus, Globocassidulina subglobosa, Rosalina floridana and Stetsonia minuta) were common to all three sites. However, the most abundant species (Bolivina spissa, Eggerella advena, Paratrochammina ?bartrami, Veleroninoides jeffreysii) at Site III were different from those at Sites I and II, among both the live and dead assemblages. The common species (e.g., Eggerella advena) at Site III are more typical of shallow-water, inner shelf settings, a result that is consistent with published observations on metazoan macrofauna (>300 μm) at similar depths on the slope off Cape Hatteras. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.