LIVING SMALL-SIZED (63-150  m) FORAMINIFERA FROM MID-SHELF TO MID-SLOPE ENVIRONMENTS IN THE BAY OF BISCAY

Duchemin, Gérald; Fontanier, Christophe; Jorissen, Frans; Barras, Christine; Griveaud, Clémentine

doi:10.2113/gsjfr.37.1.12

Cited by 74 publications

(45 citation statements)

References 69 publications

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“…Given that at 1650 AD H. balthica replaces N. iridea, a well-known fresh-phytodetritus-feeder (e.g. Gooday and Hughes, 2002;Duchemin et al, 2007;Alve, 2010;Goineau, 2012), the faunal shift may reflect reduced primary productivity and consequently the dominance of partially degraded organic matter at the sea floor. This is further supported by a small decrease in dinoflagellate cyst abundance (Nordberg and Harland, unpublished data) and δ 13 C values (Fig.…”

Section: Hyalinea Balthica: a Proxy Of Climate Warming Or Changed Diementioning

confidence: 99%

The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast

2013

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We discuss the climatic and environmental changes during the last millennium in NE Europe based on a ca. 8-m long high-resolved and well-dated marine sediment record from the deepest basin of Gullmar Fjord (SW Sweden). According to the ²¹⁰Pb- and ¹⁴C-datings, the record includes the period of the late Holocene characterised by anomalously cold summers and well-known as the Little Ice Age (LIA). Using benthic foraminiferal stratigraphy, lithology, bulk sediment geochemistry and stable carbon isotopes we reconstruct various phases of the cold period, identify its timing in the study area and discuss the land–sea interactions occurring during that time. The onset of the LIA is indicated by an increase in cold-water foraminiferal species Adercotryma glomerata at ~ 1350 AD The first phase of the LIA was characterised by a stormy climate and higher productivity, which is indicated by a foraminiferal unit of Nonionella iridea and Cassidulina laevigata. Maximum abundances of N. iridea probably mirror a short and abrupt warming event at ~ 1600 AD. It is likely that due to land use changes in the second part of the LIA there was an increased input of terrestrial organic matter to the fjord, which is indicated by lighter δ¹³C values and an increase of detritivorous and omnivorous species such as Textularia earlandi and Eggerelloides scaber. The climate deterioration during the climax of the LIA (1675–1704 AD), as suggested by the increase of agglutinated species, presence of Hyalinea balthica, and a decline of N. iridea may have driven the decline in primary productivity during this time period

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Section: Hyalinea Balthica: a Proxy Of Climate Warming Or Changed Diementioning

confidence: 99%

The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast

2013

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“…Our data confirm the second source. The shallower of the two midwater sediment plumes (b800 m depth) affecting the upper trap in May 2007, contained resuspended material from the outer shelf and upper slope as indicated by a large number of benthic foraminifera typical of the adjacent outer shelf and upper slope (Duchemin et al, 2007;Fontanier et al, 2002Fontanier et al, , 2003Fontanier et al, , 2006. Benthic foraminifera were earlier sampled by plankton tows and sediment traps above the shelf break and continental slope, however they were considered resuspended and transported from the shelf by storm waves in the southern Middle Atlantic Bight Biscaye, 1997, 2003), and from shallow environments by waves and strong tidal currents (Murray et al, 1982;English channel).…”

Section: Origin and Formation Of Lateral Fluxmentioning

confidence: 99%

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)

Kuhnt¹,

Howa²,

Schmidt³

et al. 2013

Journal of Marine Systems

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International audienceThe temporal and water depth related dynamics of planktic foraminiferal fluxes in the south-eastern Bay of Biscay are discussed for a two year sampling period (June 2006-June 2008). Two sediment traps deployed at 800 m and 1700 m water depth at a mooring in 2000 m of water depth, were analyzed for the flux of planktic foraminiferal species > 150 μm, in comparison with the total mass flux. Total flux of planktic foraminifera shows seasonal maxima in spring/early summer (> 2000 Ind. m− 2 d− 1) and minima from late summer through winter (< 10 Ind. m− 2 d− 1). The flux of planktic foraminiferal tests in the intermediate to deep water column at the inner Bay of Biscay comprises an intermittent and regionally variable signal of seasonal surface water primary productivity. Significant lateral transport and flux of particles superimposed on the downward mass flux indicate a decoupling of fluxes between the 800-m and 1700-m traps. The 210Pb budget and the presence of certain benthic foraminiferal species in the midwater column prove that the lateral flux originated from the upper continental slope. Despite the temporal and vertical variations of the particulate flux, a well-defined seasonal flux signal can be deduced from the frequency of planktic foraminiferal species

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“…>63mm per gram of dry weight sediment) may not be related in a predictable manner to the C org flux reaching the seafloor. Indeed, the benthic foraminiferal fauna in core MD02-2589 is dominated by small species: A. weddellensis, N. iridea, E. exigua, and E. vitrea which are typically present in the <125 mm size fraction [Gooday and Lambshead, 1989;Gooday, 1986Gooday, , 2003Duchemin et al, 2007]. Epistominella exigua and A. weddellensis are also known to feed on, and reproduce in phase with seasonal pulses of fresh [Mackensen et al, 1993a]).…”

Section: Benthic Foraminifera and Paleoenvironmental Interpretationmentioning

confidence: 99%

“…are large shallow infaunal species that have generally been linked to fairly high, continuous food supply with moderate oxygen depletions [Lutze and Coulbourn, 1984;Fariduddin and Loubere, 1997;Mackensen et al, 1993bMackensen et al, , 1995Schönfeld and Altenbach, 2005;Licari and Mackensen, 2005;Hayward et al, 2002Hayward et al, , 2006. Cassidulina and Uvigerina species have been also reported as benefiting from phytoplankton blooms (e.g., C. carinata, U. peregrina [Duchemin et al, 2007]) or react quickly to phytodetritus (e.g., C. crassa [Suhr and Pond, 2006] and U. akitaensis [Nomaki et al, 2005]). Melonis barleeanum seems to prefer slightly altered organic matter [Caralp, 1989;Licari and Mackensen, 2005] or bacterial stocks [Fontanier et al, 2005].…”

Section: Pa4218mentioning

confidence: 99%

“…Its presence in the benthic assemblage therefore is a good indication of conditions favorable for enhanced carbonate preservation. Nonionella iridea has been related to high-sediment C org content [Mackensen et al, 1990], phytodetrital inputs (but it does not occur within the phytodetrital aggregates and probably benefits from bacterial densities beneath phytodetritus, [Gooday and Lambshead, 1989;Gooday and Hughes, 2002]), and episodic pulses of labile C org flux to the seafloor [Duchemin et al, 2005[Duchemin et al, , 2007. The highest concentration of N. iridea is coincident with high C org concentrations during early MIS 2.…”

Section: Pa4218mentioning

confidence: 99%

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Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

et al. 2007

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[1] Benthic foraminiferal assemblages and the carbon isotope composition of the epifaunal benthic foraminifera Epistominella exigua and Fontbotia wuellerstorfi have been investigated along core MD02-2589 located at the southern Agulhas Plateau (41°26.03 0 S, 25°15.30 0 E, 2660 m water depth). This study aims to evaluate changes in the benthic paleoenvironment and its influence on benthic d 13 C with a notable focus on E. exigua, a species associated with phytodetritus deposits and poorly studied in isotope paleoceanographic reconstructions. The benthic foraminiferal assemblages (>63 mm) show large fluctuations in species composition suggesting significant changes in the pattern of ocean surface productivity conceivably related to migrations of the Subtropical Convergence (STC) and Subantarctic Front (SAF). Low to moderate seasonality and relatively higher food supply to the seafloor are indicated during glacial marine isotope stages (MIS) 6, 4, and 2 and during MIS 3, probably associated with the northward migration of the SAF and confluence with the more stationary STC above the southern flank of the Agulhas Plateau. The lowest organic carbon supply to the seafloor is indicated from late MIS 5b to MIS 4 as a consequence of increased influence of the Agulhas Front (AF) and/or weakening of the influence of the STC over the region. Episodic delivery of fresh organic matter, similar to modern conditions at the core location, is indicated during MIS 5c-MIS 5e and at Termination I. Comparison of this paleoenvironmental information with the paired d 13 C records of E. exigua and F. wuellerstorfi suggests that organic carbon offsets d 13 C of E. exigua from ambient bottom water d 13 C DIC , while its d 13 C amplitude, on glacial-interglacial timescales, does not seem affected by changes of organic carbon supply to the seafloor. This suggests that this species calcifies preferentially during the short time span of the year when productivity peaks and phytodetritus is delivered to the seafloor. Therefore E. exigua, while offset from d 13 C DIC , potentially more faithfully records the amplitude of ambient bottom water d 13 C DIC changes than F. wuellerstorfi, notably in settings such as the Southern Ocean that experienced substantial changes through time in the organic carbon supply to the seafloor.Citation: Diz, P., I. R. Hall, R. Zahn, and E. G. Molyneux (2007), Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes, Paleoceanography, 22, PA4218,

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LIVING SMALL-SIZED (63-150 m) FORAMINIFERA FROM MID-SHELF TO MID-SLOPE ENVIRONMENTS IN THE BAY OF BISCAY

Cited by 74 publications

References 69 publications

The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast

The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

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