Spatial distribution of live benthic foraminifera in the Rhône prodelta: Faunal response to a continental–marine organic matter gradient

Mojtahid, Meryem; Jorissen, Frans; Lansard, Bruno; Fontanier, Christophe; Bombled, Bruno; Rabouille, Christophe

doi:10.1016/j.marmicro.2008.12.006

Cited by 155 publications

(126 citation statements)

References 78 publications

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“…The interpretation of river-derived continental matter input is corroborated by appearance of B. elongata that has been observed in comparable environments of the Mediterranean Sea (Jorissen, 1988;Mojtahid et al, 2009). Enhanced river run-off influence is also suggested by the low P/B ratio values in the muddy interval (Fig.…”

supporting

confidence: 68%

“…The oxygen content of the sea floor and in the pore waters is controlled by the quantity of organic matter. In environments with high organic input, the remineralisation of organic matter decreases the oxygen concentration on the sea floor as well as the depth of oxygen penetration below the water-sediment interface (Jorissen et al, 1995;Mojtahid et al, 2009Mojtahid et al, , 2010a.…”

Section: Paleoenvironmental Key Factors: Continental Versus Marine Ormentioning

confidence: 99%

“…Similarly, Bulimina elongata, an associated species of the N. fabum assemblage, can also feed from low quality organic matter and tolerates low oxygen concentrations (Diz and Francés, 2008;Mojtahid et al, 2009). Coincidently, B. elongata also occurs in the Rhône prodelta close to the river mouth (Mojtahid et al, 2009).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…In the prodelta of the Rhône River, V. complanata and some arenaceous taxa, such as Textularia agglutinans and Textularia porrecta, occur close to the end of the freshwater layer entering the marine waters. Food supply in this environment is mainly of marine origin although there is still influence of organic matter provided from the continent (Mojtahid et al, 2009, Goineau et al, 2011. Thus, the Spiroplectinella sp.…”

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: 68%

Section: Paleoenvironmental Key Factors: Continental Versus Marine Ormentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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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“…The biotope is also sensitive to continental-marine organic matter input (Mojtahid et al, 2009). High disturbance could be caused by dredging activities or by trawling (Thrush & Dayton, 2002).…”

Section: Organically-enriched or Anoxic Sublittoral Habitats (Eunis Amentioning

confidence: 99%

Assessment of goods and services, vulnerability, and conservation status of European seabed biotopes: a stepping stone towards ecosystem-based marine spatial management

et al. 2012

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The goal of ecosystem-based marine spatial management is to maintain marine ecosystems in a healthy, productive and resilient condition; hence, they can sustainably provide the needed goods and services for human welfare. However, the increasing pressures upon the marine realm threaten marine ecosystems, especially seabed biotopes, and thus a well-planned approach of managing use of marine space is essential to achieve sustainability. The relative value of seabed biotopes, evaluated on the basis of goods and services, is an important starting point for the spatial management of marine areas. Herein, 56 types of European seabed biotopes and their related goods, services, sensitivity issues, and conservation status were compiled, the latter referring to management and protection tools which currently apply for these biotopes at European or international level. Fishing activities, especially by benthic trawls, and marine pollution are the main threats to European seabed biotopes. Increased seawater turbidity, dredged sediment disposal, coastal constructions, biological invasions, mining, extraction of raw materials, shipping-related activities, tourism, hydrocarbon exploration, and even some practices of scientific research, also exert substantial pressure. Although some first steps have been taken to protect the European sea beds through international agreements and European and national legislation, a finer scale of classification and assessment of marine biotopes is considered crucial in shaping sound priorities and management guidelines towards the effective conservation and sustainability of European marine resources.

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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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Spatial distribution of live benthic foraminifera in the Rhône prodelta: Faunal response to a continental–marine organic matter gradient

Cited by 155 publications

References 78 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

Assessment of goods and services, vulnerability, and conservation status of European seabed biotopes: a stepping stone towards ecosystem-based marine spatial management

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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