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Registros recuperados: 14
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Are deep-sea ecosystems surrounding Madagascar threatened by land-use or climate change? ArchiMer
Fontanier, Christophe; Mamo, Briony; Toucanne, Samuel; Bayon, Germain; Schmidt, Sabine; Deflandre, Bruno; Dennielou, Bernard; Jouet, Gwenael; Garnier, Eline; Sakai, Saburo; Lamas, Ruth Martinez; Duros, Pauline; Toyofuku, Takashi; Sale, Aurelien; Belleney, Deborah; Bichon, Sabrina; Boissier, Audrey; Cheron, Sandrine; Pitel, Mathilde; Roubi, Angelique; Rovere, Mickael; Gremare, Antoine; Dupre, Stephanie; Jorry, Stephan.
In this short communication, we present a multidisciplinaty study of sedimentary records collected from a deep-sea interfluve proximal to the mouths of major northwestern Madagascan rivers. For the last 60 years, the seafloor has been repeatedly disturbed by the deposition of organic rich, tropical, terrestrial sediments causing marked reductions in benthic biodiversity. Increased soil erosion due to local land-use, deforestation and intensifying tropical cyclones are potential causes for this sedimentary budget and biodiversity shift. Our marine sedimentary records indicate that until now, these conditions have not occurred within the region for at least 20,000 years.
Tipo: Text Palavras-chave: Multidisciplinary study; Benthic foraminifera; Land-use; Tropical cyclones.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00413/52488/53276.pdf
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Benthic foraminifera as bio-indicators of drill cutting disposal in tropical east Atlantic outer shelf environments ArchiMer
Mojtahid, Meryem; Jorissen, Frans; Durrieu, Josiane; Galgani, Francois; Howa, Helene; Redois, Fabrice; Camps, Roger.
We present a study of benthic foraminiferal. faunas from the outer continental shelf off Congo (tropical West Africa), with the aim to determine the impact of the discharge of oily drill cuttings on the sea floor environment, to judge the regenerating capacity of the benthic ecosystem, and to investigate the possibility to develop an environmental monitoring method for open marine continental shelf environments, based on benthic foraminifera. We studied the spatial distribution and microhabitats of living and dead foraminiferal faunas, sampled in April 2003, 4 years after the end of disposal activities, in the upper 3 cm of the sediment at 9 stations (about 180 m depth) offshore Congo, that were subject to various degrees of pollution by oily cuttings from...
Tipo: Text Palavras-chave: Oily cuttings; Opportunistic taxa; Drill mud; Bio indicator; Eutrophication; Outer shelf; Benthic foraminifera.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2170.pdf
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Benthic foraminifera distribution in high polluted sediments from Niterói Harbor (Guanabara Bay), Rio de Janeiro, Brazil Anais da ABC (AABC)
Vilela,Claudia G.; Batista,Daniele S.; Batista-Neto,José A.; Crapez,Mirian; Mcallister,John J..
Dockyards and harbors are recognized as being important locations where sediment-associated pollutants can accumulate, which constitutes an environmental risk to aquatic life due to potential uptake and accumulation of heavy metals in the biota. The aim of this paper is to assess the concentrations and the effects of some heavy metals in the benthic foraminifera assemblage in Niterói Harbor. Low concentrations in the benthic foraminifera as well as the dominance of indicative species such as Ammonia tepida, Buliminella elegantissima and Bolivina lowmani can be associated with an environment under stress. In addition, the occurrence of test abnormalities among foraminifera may represent a useful biomarker for evaluating long-term environmental impacts in a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic foraminifera; Guanabara Bay; Pollution; Heavy-metals.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100014
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Benthic foraminiferal response to sedimentary disturbance in the Capbreton canyon (Bay of Biscay, NE Atlantic) ArchiMer
Duros, Pauline; Silva Jacinto, Ricardo; Dennielou, Bernard; Schmidt, S.; Martinez Lamas, Ruth; Gautier, Emeric; Roubi, Angelique; Gayet, Nicolas.
Living (Rose Bengal stained) and dead benthic foraminifera were investigated at 6 deep-sea sites sampled in the Capbreton canyon area (Bay of Biscay, France). Three sites were located along the canyon axis at 301 m, 983 m and 1478 m and 3 stations were positioned on adjacent terraces at 251 m, 894 m and 1454 m. Sedimentary features indicate that frequent sedimentary disturbances of different magnitudes occur along the Capbreton canyon axis and adjacent terraces. Such environmental conditions cause the presence of very particular benthic environments. Along the 6 studied sites, different foraminiferal responses to various sedimentary patterns are observed revealing the complexity of this canyon environment. Some sites (Gitan 3 (canyon axis), Gitan 5 (canyon...
Tipo: Text Palavras-chave: Benthic foraminifera; Capbreton canyon; Habitat disturbance; Turbidite; Submarine canyon.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00360/47121/47052.pdf
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Dynamique et réponse fonctionnelle des foraminifères et de la macrofaune benthiques en zone ostréicole dans les pertuis charentais ArchiMer
Bouchet, Vincent.
In oyster farming areas, organic matter fluxes toward sediment is increased. Pacific oysters (Crassostrea gigas) reject organic-rich faeces and pseudofaeces as a result of filtration process. Organic matter can be consumed by benthic fauna, but in excess it can entails the reduction of benthic faunal species richness, abundance and biomass. Organic matter degradation also induces hypoxic (or anoxic) conditions in the sediment, and production of ammonia and sulfides in toxic concentrations. The main objective of this study is to assess the effects of oyster farming on benthic intertidal ecosystems in the Pertuis Charentais. Benthic macrofauna, living (stained) foraminifera, and physicochemical characteristics of the water column and sediment were used as...
Tipo: Text Palavras-chave: CAT scan; Bioturbation; Macrofauna/foraminifera interaction; Sensible species; Tolerant species; Benthic foraminifera; Benthic macrofauna; Chlorophyl a; Organic matter; Intertidal areas; Pertuis charentais; Oyster farming; CAT scan; Bioturbation; Interaction macrofaune/foraminifères; Espèces sensibles; Espèces tolérantes; Foraminifères benthiques; Macrofaune benthique; Chlorophylle a; Matière organique; Zone intertidale; Pertuis charentais; Ostréiculture.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-2582.pdf
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Impact of oil-based drill mud disposal on benthic foraminiferal assemblages on the continental margin off Angola ArchiMer
Jorissen, F. J.; Bicchi, E.; Duchemin, G.; Durrieu, J.; Galgani, Francois; Cazes, L.; Gaultier, M.; Camps, R..
In order to assess the possible environmental impact of oily cuttings discharged during oil exploration activities, we studied the benthic foraminiferal faunas in a five-station, 4-km-long sampling transect around a cuttings disposal site at about 670 m depth offshore Angola (W Africa). where drilling activities started 1.5 years before sampling. Living (Rose Bengal stained) and dead foraminiferal faunas were sampled in March 2006. The faunal patterns mirror the spatial distribution of hydrocarbons, which are dispersed into a southeastern direction. Four different areas can be distinguished on the basis of the investigated faunal parameters (density, diversity and species composition of the living fauna, and comparison with subrecent dead faunas). The...
Tipo: Text Palavras-chave: W Africa; Upper continental slope; Offshore Angola; Drill cuttings; Bio indicators; Benthic foraminifera.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7301.pdf
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Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain Ameghiniana
González-Regalado,María Luz; Ruiz,Francisco; Abad,Manuel; Civis,Jorge; González Delgado,José Ángel; Muñoz,Juan Manuel; García,Edith Xio Mara; Pendón,José Gabriel; Toscano,Antonio.
Lithostratigraphical and faunal analyses of five Pliocene sections located in the southwestern Guadalquivir Basin (S Spain) permit reveal three main facies, which represent shallow marine fairweather conditions (FA-1), storm events (FA-2) and littoral/fluvial environments (FA-3). The vertical disposition of these facies indicates a regressive sequence. The statistical study of foraminiferal populations revealed five infralittoral and circalittoral assemblages. Vertical and horizontal variations among these assemblages, the P/B ratio and four diversity indices, together with the mollusc distributions, suggest the presence of a shallow marine palaeoenvironment in this area in the Lower Pliocene, with an increasing depth towards the southwestern. The main...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic foraminifera; Storms; Lower Pliocene; SW Spain.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000200011
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La distribution des assemblages d’ostracodes et de foraminifères benthiques le long des derniers 550 ka dans le bassin Est-Corse, Méditerranée occidentale : une reconstitution paléo-environnementale ArchiMer
Angue Minto’o, Charlie Morelle; Bassetti, Maria-angela; Toucanne, Samuel; Jouet, Gwenael.
The study of Quaternary sediments covering the last 550 kyr from the borehole GDEC-4-2, East-Corsica basin, was performed through the study of benthic meiofaunal assemblages (ostracoda and benthic foraminifera) whose distribution responds to climate changes, and glacial–interglacial variability in particular. The interglacial ostracod group is mainly composed of the Argilloecia acuminata, Cytheropteron alatum, Henryhowella sp., Polycope sp. and Cytherella sp., which indicate an enhanced surface productivity and possibly high bottom water temperature during these warm intervals. Benthic foraminifera, such as Hoeglundina elegans, Sigmoilopsis schlumbergeri, Bigenerina nodosaria and Hyalinea balthica are predominant during interglacial periods and also show...
Tipo: Text Palavras-chave: Est-Corse; Ostracode; Foraminifère benthique; Groupe allochtone; East-Corsica; Ostracoda; Benthic foraminifera; Allochthonous group.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00313/42426/42030.pdf
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Larger benthic foraminifera and their distribution patterns on the Spermonde shelf, South Sulawesi Naturalis
Renema, W.; Hoeksema, B.W.; Hinte, J.E. van.
A systematic description of the distributional pattern of 20 species of larger benthic foraminifera on the Spermonde Archipelago and their relation with environmental parameters is presented. Around 13 islands transects at the exposed and leeward slope were sampled. Apart from parameters like substrate type, hydrodynamic energy and light intensity (directly related to depth) also nutrient availability and environmental stabiltity determine the distribution over the shelf. Some of the species, and especially the calcarinids, are less specialised to some of these parameters than in other areas. Elphidium craticulatum, showing chloroplast husbandry, is an important fauna component.
Tipo: Article / Letter to the editor Palavras-chave: Benthic foraminifera; Spermonde Archipelago; Sulawesi; Distribution; Ecology; 42.79.
Ano: 2001 URL: http://www.repository.naturalis.nl/record/219452
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Live−dead comparison of benthic foraminiferal faunas from the Rhône prodelta (Gulf of Lions, NW Mediterranean): Development of a proxy for palaeoenvironmental reconstructions ArchiMer
Goineau, A.; Fontanier, Christophe; Mojtahid, M.; Fanget, Anne-sophie; Bassetti, M-a.; Berne, Serge; Jorissen, F..
Dead benthic foraminiferal faunas (> 150 μm) from the Rhône prodelta (Gulf of Lions, NW Mediterranean) were analysed at 41 stations (15–100 m water depth) sampled in June 2005 and September 2006, and compared to the living faunas investigated during previous studies at the same stations. The comparison between dead and living assemblages enhances the understanding of taphonomic processes that may modify the composition of the dead faunas in this area. We observed a loss of individuals from living to dead assemblages of species characterised by a fairly fragile test and therefore more prone to fragmentation or dissolution (e.g., Bolivina alata, Quinqueloculina tenuicollis). Allochthonous dead and/or live specimens may be transported to some parts of the...
Tipo: Text Palavras-chave: Benthic foraminifera; Rhone prodelta; Taphonomy; Thanatofacies; Palaeoceanography.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38399/36725.pdf
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Living (stained) calcareous benthic foraminifera from recent sediments off Concepción, central-southern Chile (~36° S) RChHN
TAPIA,RAÚL; LANGE,CARINA B; MARCHANT,MARGARITA.
This study examines onshore-offshore and vertical distribution of living (Rose Bengal stained) benthic foraminifera (> 180 μm fraction) from three sediment stations along a bathymetric transect off Concepción, Chile (station 18 = 88 m water depth, station 26 = 120 m, station 40 = 1,030 m), within and below the oxygen minimum zone. All cores were collected in austral winter. Calcareous foraminifera dominated the three stations. The species composition, living foraminifera density, and vertical distribution patterns within the sediment changed in accordance with bottom water dissolved oxygen concentration and food availability. Onshore-offshore pattern revealed overall highest living foraminiferal densities at shelf stations 18 and 26 where...
Tipo: Journal article Palavras-chave: Benthic foraminifera; Sediments; Oxygen minimum zone; Concepción; Chile.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300009
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Mid- to late-Holocene environmental evolution of the Loire estuary as observed from sedimentary characteristics and benthic foraminiferal assemblages ArchiMer
Durand, M.; Mojtahid, M.; Maillet, G. M.; Proust, J. -n.; Lehay, D.; Ehrhold, Axel; Barre, A.; Howa, H..
We used sedimentological and foraminiferal characteristics of four sedimentary cores, supported by paleogeographical and historical data, to reconstruct the depositional history of the inner Loire estuary (Near Saint-Nazaire, France) and the response of benthic foraminifera to the mid- to late-Holocene marine flooding of the incised valley. These were further used to evaluate the consequent changes in estuarine morphological and hydro-sedimentary patterns during this time period. Our results described significant changes in hydro-sedimentary dynamics over the past ~ 6 kyrs BP. At our location, these changes expressed the combined influence of marine (e.g., tide, storm waves) and fluvial dynamics (e.g., floods), which are linked, on a broader scale, to...
Tipo: Text Palavras-chave: Macrotidal estuary; Mid-latitude estuary; Holocene paleoenvironment; Estuarine facies; Benthic foraminifera; Sea-level change.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00347/45849/45511.pdf
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New constraints on deglacial marine radiocarbon anomalies from a depth transect near Baja California ArchiMer
Lindsay, Colin M.; Lehman, Scott J.; Marchitto, Thomas M.; Carriquiry, Jose D.; Ortiz, Joseph D..
Previous studies have shown that radiocarbon activities (C-14) in the low-latitude, middepth Pacific and Indian Oceans were anomalously low during Heinrich Stadial 1 (HS1, similar to 17.8-14.6ka) and the Younger Dryas (YD, similar to 12.8-11.5ka), coincident with intervals of rising atmospheric CO2 concentration and declining atmospheric C-14. However, a full explanation of these events remains elusive due to sparse and sometimes conflicting data. Here we present new C-14 measurements on benthic and planktic foraminifera that, in combination with previously published measurements, enable us to reconstruct the C-14 depth gradient near Baja California. Vertical profiles were similar to present during the Last Glacial Maximum and BOlling/Allerod (14.6-12.8ka)...
Tipo: Text Palavras-chave: Radiocarbon; Deglaciation; Heinrich Stadial 1; Baja California; Benthic foraminifera.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00496/60797/64925.pdf
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Transformation de la phase solide à travers l’estuaire de la Loire en relation avec son environnement chimique et biologique ArchiMer
Thibault De Chanvalon, Aubin.
Before reaching the ocean, riverine particles from the Loire watershed undergo important chemical transformations in the estuary. This study aims to identify and characterize main processes involving iron (and to a lesser extent Al, Mn, PO4 3- and rare earths elements). Suspended particulate matter data show that 15% of their iron is lost through the estuary. Reductive iron dissolution during deposition periods is likely to explain most of this loss. However, estuarine sediments are characterized by high spatial heterogeneity due to macrofaunal activities. To overcome this difficulty, new methodologies of high resolution and two-dimensional analyses and calculation of pore water, sediment and benthic meiofauna were developed. These developments enable to...
Tipo: Text Palavras-chave: Estuaire; Fer; Phosphore; Nitrate; Foraminifère benthique; Diagenèse précoce; Loire; Bioturbation; Estuary; Iron; Phosphorus; Nitrate; Benthic foraminifera; Precocious diagenesis; Loire; Bioturbation.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00498/60932/64325.pdf
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