Seasonal variability of living benthic foraminifera from the outer continental shelf of the Bay of Biscay

Duchemin, Gérald; Jorissen, Frans; Loc’h, François Le; Andrieux-Loyer, Françoise; Hily, Christian; Thouzeau, Gérard

doi:10.1016/j.seares.2008.03.006

Cited by 52 publications

(34 citation statements)

References 46 publications

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“…However, the increased abundance of B. spathulata could also be related to nutrient influx derived from the continent as has been observed by other authors (i.e. Duchemin et al, 2008;Schmiedl et al, 2010). (Haunold et al, 1997;Rezqi et al, 2000;Duchemin et al, 2008).…”

supporting

confidence: 58%

“…5 and 11). Nonion fabum is usually associated with eutrophic environments with high organic matter of low quality and significant oxygen depletion (Fontanier et al, 2002;Duchemin et al, 2008;Mojtahid et al, 2010aMojtahid et al, , 2010b.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Duchemin et al, 2008;Schmiedl et al, 2010). (Haunold et al, 1997;Rezqi et al, 2000;Duchemin et al, 2008). In the present-day northern and northeastern Gulf of Cádiz, extensive mud deposits accumulate on the middle shelf, related to the Guadiana run-off and to the Guadalquivir prodelta (Gutiérrez-Mas et al, 1996;Nelson et al, 1999).…”

mentioning

confidence: 99%

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Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Pérez-Asensio

Aguirre

Schmiedl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Benthic foraminiferal assemblages of a drill core from the lower Guadalquivir Basin (northern Gulf of Cádiz, SW Spain) have been analysed in order to reconstruct the paleoenvironmental evolution in the vicinity of the Betic seaways during the Messinian. The core consists of marine sediments ranging from the latest Tortonian to the early Pliocene. Changes in the abundance of certain marker species, planktonic/benthic ratio (P/B ratio), paleodepth estimated with a transfer function, content of sand grains and presence of glauconitic layers indicate a complete transgressive-regressive sea-level cycle from the bottom to the top of the section. An abrupt sea-level rise, from inner-middle shelf to middle slope, is recorded at the lowermost part of the core (latest Tortonian-earliest Messinian), followed by a relatively rapid shallowing from middle slope to outer shelf. Magnetobiostratigraphic data show These assemblages are dominated by Nonion fabum and Bulimina elongata, two taxa that are able to feed from continental low-quality organic matter, most likely derived from river run-off. The paleoenviromental evolution on the Atlantic side of Betic and Rifian seaways is similar during the Messinian, with a Messinian continuous sea-level lowering driven by regional tectonic uplift and upwelling-related waters reaching the upper slope. This study will further contribute to understand the role of tectonics on the sea-level changes as well as on the closure of the Atlantic-Mediterranean gateways that led to the MSC, and on the paleoceanography on the Atlantic sides of these corridors.

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supporting

confidence: 58%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Pérez-Asensio

Aguirre

Schmiedl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…To assess changes in flux, provenance and degradation state of the organic matter we used the relative abundances of high-productivity target taxa including Uvigerina peregrina s.l. (U. peregrina + U. pygmaea), which thrives in environments with input of fresh marine organic matter, Bulimina subulata related to degraded marine organic matter, and Brizalina spathulata and Bulimina aculeata indicative of supply of degraded continental organic matter (Donnici & Serandrei-Barbero 2002;Schmiedl & Leuschner 2005;Murray 2006;Diz & Francés 2008;Duchemin et al 2008;Schmiedl et al 2010). In addition, changes in palaeo-oxygenation of the bottom water mass were analysed using the index of Schmiedl et al (2003), [HO/(HO + LO) + Div] × 0.5, in which HO is the relative abundance of high-oxygen indicators (epifaunal taxa and miliolids), LO is the relative abundance of low-oxygen indicators (deep infaunal taxa), and Div is normalized benthic foraminiferal diversity using the Shannon index (H) calculated with the software PAST (Hammer et al 2001).…”

Section: Methodsmentioning

confidence: 99%

“…More recent studies demonstrated that the distribution of certain taxa is additionally controlled by specific biogeochemical conditions, seasonality and quality of the supplied food. Various opportunistic species respond to input of freshly produced marine phytodetritus, whereas other species are able to feed from degraded re-suspended organic matter or from terrestrial organic matter in the vicinity of river mouths (Fontanier et al 2003;Diz & Francés 2008;Duchemin et al 2008;Koho et al 2008).…”

Section: Processes Influencing the Stable Isotope Signal Of Foraminifmentioning

confidence: 99%

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Pérez-Asensio

Aguirre

Schmiedl

et al. 2014

JGS

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Abstract:The stable isotope composition of planktic and benthic foraminifera and the distribution of selected benthic foraminiferal species from a Messinian record of the lower Guadalquivir Basin, northeastern Atlantic Ocean, show that regional productivity changes were linked to glacioeustatic fluctuations. Glacial periods were characterized by poorly ventilated bottom waters as a result of weak Atlantic Meridional Overturning Circulation (AMOC), and by phases of high productivity related to intensified upwelling. In contrast, wellventilated bottom waters owing to strong AMOC, the presence of degraded organic matter in the upper slope, and high input of degraded terrestrial organic matter derived from fluvial discharge to the outer shelf were recorded during interglacial periods. Before closure of the adjacent Guadalhorce Corridor at 6.18 Ma, which was the final active Betic Atlantic-Mediterranean gateway, the study area was alternately influenced by wellventilated Mediterranean Outflow Water (MOW) and poorly ventilated Atlantic Upwelled Water (AUW). Following closure of the corridor, cessation of the MOW reduced the AMOC and promoted glacial conditions in the northern hemisphere, resulting in the establishment of local upwelling cells.

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Impact of organic matter source and quality on living benthic foraminiferal distribution on a river‐dominated continental margin: A study of the Portuguese margin

et al. 2016

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Living (rose Bengal stained) benthic foraminifera were investigated on surface sediments from 23 stations from the river-dominated northwestern Portuguese margin. Samples were collected in March 2011, following the period of the maximum rainfall over the Iberian Peninsula, between 20 and 2000 m water depth along five cross-margin transects. Four of them are located off the Douro, Mondego, Tagus, and Sado Rivers and one off the Estremadura coast. The major objectives of this study are (1) to assess the impact of organic matter of various origin and quality on the benthic foraminifera and (2) to investigate the spatial differences of faunal distribution from coastal waters to the deep sea under river influences. To do this, sedimentological and biogeochemical characteristics of the sediments were identified by measuring grain size, oxygen penetration depth, total organic carbon (TOC) content, stable carbon isotopic composition of TOC (δ 13 C TOC ) and concentration of pigments and amino acids. Based on the principal component and cluster analyses of the environmental data, three major geographical groups are identified: (1) deep stations, (2) coastal and middle slope stations, and (3) shelf stations under river influence. At the deepest stations, species are associated with high organic matter (OM) quantity but low OM quality, where Uvigerina mediterranea, Hoeglundina elegans, and agglutinated species such as Reophax scorpiurus or Bigenerina nodosaria are dominant. All stations off the Sado River, which is the most affected area by the anthropogenic influence, are also characterized by high quantity but low quality of OM with the minimum faunal density and diversity within the study area. Middle slope stations are associated with low OM content and coarse sediments (Q 50 ) with the predominance of N. scaphum. Shallow shelf stations close to the Douro and Tagus River mouths show a dominance of taxa (e.g., Ammonia beccarii, Bulimina aculeata, Eggerelloides scaber, Nonion scaphum, Cancris auriculus, and Quinqueloculina seminula) adapted to environments characterized by high OM quality (high fresh chlorophyll (Chl a/Phaeo)) and available amino acids (enzymatically hydrolyzable amino acid (EHAA)/total enzymatically hydrolyzable amino acid (THAA)). The Biotic and Environmental linking analysis suggests that the benthic foraminiferal distribution is mostly controlled by three environmental parameters, i.e., TOC (quantity), EHAA/THAA (quality), and δ 13 C TOC (source). Hence, this study clearly highlights that the quantitative and qualitative inputs of OM and its source are the most important factors controlling the living benthic foraminiferal distribution with clear influences between the different rivers. This study also suggests a good tolerance of several species for river discharges where the OM quality is high.

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Seasonal variability of living benthic foraminifera from the outer continental shelf of the Bay of Biscay

Cited by 52 publications

References 46 publications

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Impact of organic matter source and quality on living benthic foraminiferal distribution on a river‐dominated continental margin: A study of the Portuguese margin

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