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Registros recuperados: 52
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Aspectos bioecológicos del ictioplancton en la estación fija "La Libertad" durante 1997 OceanDocs
Luzuriaga de Cruz, M.; Ortega, D.; Elías, E..
El presente trabajo se refiere a las variaciones observadas en el ictioplancton presente en la estación fija "La Libertad" desde febrero de 1997 hasta diciembre del mismo año. Los datos se relacionan con las observaciones ecológicas hechas en base a indicadores de masas de agua, formaníferos planctónicos, presentes en las mismas muestras.
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Fixed stations; Fish larvae; Fish eggs; Foraminifera; Community composition; Species diversity; Fish larvae; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1998 URL: http://hdl.handle.net/1834/2289
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Atlantic Meridional Overturning Circulation during the Last Glacial and Deglacial: Inferences from the Atlantic Tropical Thermocline Temperature and Seawater Radiocarbon Activity ArchiMer
Huang, Enqing.
This thesis aims to investigate variations of the last glacial and deglacial Atlantic Ocean circulation, with emphasize on the Atlantic deepwater ventilation rate during the Last Glacial Maximum (LGM). The highlights of the thesis are as the followings: (1) the modern frontal zone between the North Atlantic and the South Atlantic central waters off NW Africa shifted to the south during the last glacial and deglacial time periods. (2) The radiocarbon-based circulation age of the deep Atlantic (> 1500 m) was estimated to be less than 400 years during the LGM, which was equal to or less than its pre-bomb value. Therefore, the LGM deep Atlantic was inferred to be well ventilated. (3) The abyssal Atlantic (below 2500 m) prior to the LGM was more depleted in...
Tipo: Text Palavras-chave: Climate change; Ocean circulation; Atlantic Ocean; Glacial; Deglacial; Thermocline; Radiocarbon; Global carbon cycle; Foraminifera; Carbonate; Trace elements; Deep ocean ventilation rates.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00493/60446/63891.pdf
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Bacterivory in the common foraminifer Ammonia tepida: Isotope tracer experiment and the controlling factors ArchiMer
Pascal, P.y.; Dupuy, C; Richard, P; Niquil, N.
The majority of sediment dweller foraminifera are deposit feeders. They use their pseudopodia to gather sediment with associated algae, organic detritus and bacteria. Uptake of bacteria by foraminifera have been observed but rarely quantified. We measured uptake of bacteria by the common foraminifera Ammonia tepida using 15N pre-enriched bacteria as tracers. In intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental parameters. Grazing experiments were performed in order to measure effects of abiotic (temperature, salinity and irradiance) and biotic (bacterial and algal abundances) factors on uptake rates of bacteria. In mean conditions, A. tepida grazed 78 pgC ind-1 h-1 during the first eight hours of incubation,...
Tipo: Text Palavras-chave: Trophoecology; Prey abundance; Mudflat; Grazing; Foraminifera; Environmental factor; Bacteria.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4298.pdf
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Benthic foraminifera from the deep-water Niger delta (gulf of Guinea): Assessing present-day and past activity of hydrate pockmarks ArchiMer
Fontanier, Christophe; Koho, K. A.; Goni-urriza, M. S.; Deflandre, Bruno; Galaup, S.; Ivanovsky, A.; Gayet, Nicolas; Dennielou, Bernard; Gremare, Antoine; Bichon, S.; Gassie, C.; Anschutz, P.; Duran, R.; Reichart, G. J..
We present ecological and isotopic (δ18O and δ13C) data on benthic foraminifera sampled from 4 deep-sea stations in a pockmark field from the deep-water Niger delta (Gulf of Guinea, Equatorial Atlantic Ocean). In addition, a series of sedimentological and (bio)geochemical data are shown to back up foraminiferal observations. All stations are located within 1.2 km of each other, so prevailing oceanographic conditions can be assumed to be similar at each site. Two of the sites (GMMC-01 and GMMC-02) are located in a pockmark (named “pockmark A”) where current methane seepages were recorded by ROV observations. A third station (GMMC-03) is located in the topographic depression interpreted as a collapsed pockmark (named “pockmark B”). The fourth site (GMMC-04)...
Tipo: Text Palavras-chave: Niger delta; Hydrate pockmark; Foraminifera; Stable isotopes; Bacteria.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00211/32194/30628.pdf
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Benthic Foraminiferal response to sea level change in the mixed siliciclastic-carbonate system of southern Ashmore Trough (Gulf of Papua) ArchiMer
Carson, Brooke E.; Francis, Jason M.; Leckie, R. Mark; Droxler, Andre W.; Dickens, Gerald R.; Jorry, Stephan J.; Bentley, Sam J.; Peterson, Larry C.; Opdyke, Bradley N..
Ashmore Trough in the western Gulf of Papua (GoP) represents an outstanding modern example of a tropical mixed siliciclastic-carbonate depositional system where significant masses of both river-borne silicates and bank-derived neritic carbonates accumulate. In this study, we examine how benthic foraminiferal populations within Ashmore Trough vary in response to sea level-driven paleoenvironmental changes, particularly organic matter and sediment supply. Two 11.3-m-long piston cores and a trigger core were collected from the slope of Ashmore Trough and dated using radiocarbon and oxygen isotope measurements of planktic foraminifera. Relative abundances, principal component analyses, and cluster analyses of benthic foraminiferal assemblages in sediment...
Tipo: Text Palavras-chave: Papua New Guinea; Margins; Foraminifera.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00087/19837/17482.pdf
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Biological results of the Snellius expedition XXX : the foraminifera collected in 1929 and 1930 in the eastern part of the Indonesian Archipelago Naturalis
Hofker, J..
INTRODUCTION Of the bottom material collected by the Snellius-Expedition 78 samples contained Foraminifera. Many of these samples were extremely small, since they were gathered by means of piston core samplers; some were larger, as they were collected by means of a dredge; others were samples in shallow water at beaches or reefs. A l l samples were fixed in formaldehyde, so that after the 40 years they remained in store before they were studied, rests of protoplasma were seldom preserved. The numerous plankton samples, preserved in formaldehyde or in alcohol, did note contain planktonic Foraminifera; obviously the small amount of CaC03 in the samples caused the dissolution of the tests. The planktonic Foraminifera are not described here, as planktonic...
Tipo: Article / Letter to the editor Palavras-chave: Foraminifera; Indonesia; Snellius Expedition 30; 42.94.
Ano: 1978 URL: http://www.repository.naturalis.nl/record/323936
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Climatic cycles as expressed in sediments of the PROMESS1 borehole PRAD1-2, central Adriatic, for the last 370 ka: 1. Integrated stratigraphy - art. no. Q01R01 ArchiMer
Piva, A; Asioli, A; Schneider, R; Trincardi, F; Andersen, N; Colmenero Hidalgo, E; Dennielou, Bernard; Flores, J; Vigliotti, L.
[1] A multiproxy integrated chronological framework, based on oxygen and carbon stable isotope stratigraphy, biostratigraphy (foraminifera and nannoplankton bioevents and foraminifer assemblage-based climate cyclicity), magnetostratigraphy, sapropel stratigraphy, and C-14 AMS radiometric dates, has been achieved for borehole PRAD1-2, collected in 185.5 m water depth in the central Adriatic. This work was carried out within the European Community project Profiles across Mediterranean Sedimentary Systems (PROMESS1). The 71.2 m long borehole spans a time interval between late MIS 11 and MIS 1 (the last 370 ka), showing a chronological resolution of 500 and 250 years per cm during interglacial and glacial intervals, respectively. At present, this record is the...
Tipo: Text Palavras-chave: Sapropel stratigraphy; Adriatic Sea; D O events; Foraminifera; Oxygen isotope stratigraphy; Late Quaternary.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3605.pdf
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Comparison of benthic foraminifera and macrofaunal indicators of the impact of oil-based drill mud disposal ArchiMer
Denoyelle, Marieva; Jorissen, Frans J.; Martin, Daniel; Galgani, Francois; Mine, Jacques.
We compare foraminifera and macrofauna as bio-indicators of oil-based drill mud disposal site off Congo. The most polluted sites are characterized by poor faunas, dominated by some very tolerant taxa. Slightly further from the disposal site, there is an area with strongly increased densities, heavily dominated by opportunistic taxa. Still further, macrofauna appears to be similar to that at the reference area, but the foraminiferal meiofauna still suggests a slight environmental perturbation. The foraminiferal FIEI index, based on the species distribution in the study area, appears to be more discriminative than the macrofaunal ITI index, based on a priori definitions of the trophic guilds of the various taxa. Our comparative approach allows us to point...
Tipo: Text Palavras-chave: Bio-indicators; Biotic index; Drilling mud; Foraminifera; Macrofauna.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13027/10203.pdf
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Contribución al conocimiento del género Bolivina D'Orbigny 1839, (Foraminífero) en el Golfo de Guayquil OceanDocs
Gualancañay, E..
Se analizaron 29 muestras de fondo en el presente estudio, entre las profundidades de 13 y 1958 m, colectadas durante el crucero R/V "Eastward", en octubre de 1976, (Tabla 1). Se identificaron un total de 11 especies del género Bolivina: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman & McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen & Earland; B. pseudobeyrichi Cushman, f. bradyi Asano; B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
Tipo: Journal Contribution Palavras-chave: Foraminifera; Geographical distribution; Zooplankton; Geographical distribution; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 1983 URL: http://hdl.handle.net/1834/2341
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Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years ArchiMer
Rasmussen, Tl; Oppo, Dw; Thomsen, E; Lehman, Sj.
[1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with high concentrations of detrital carbonate and oxygen isotopic depletion of both surface and bottom waters. Eleven of these can be correlated with the North Atlantic Heinrich events H1-H11. The remaining very conspicuous ice-rafting event took place early in MIS substage 5e, at a time when the planktic faunal assemblage suggests marked warming of the sea surface. In the shallower core, benthic delta(13)C...
Tipo: Text Palavras-chave: Paleoceanography; Labrador Sea; Ice rafting; Foraminifera; Last climate cycle.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00496/60768/65083.pdf
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Devenir des bactéries dans les réseaux trophiques des vasières intertidales : le cas de brouage (Baie de Marennes-Oléron) ArchiMer
Pascal, Pierre-yves.
Bacteria are highly abundant and productive in intertidal mudflat sediments. By analogy with pelagic system, it has been suggested that bacteria play an important role in benthic food web. Due to technical difficulties, numbers of studies dealing with benthic bacterivory are not numerous and give conflicting results. A method using community of 15N enriched bacteria as tracer was developed in order to measure grazing of meiofauna and macrofauna. Since enriched bacteria present characteristics of size, activity and diversity close to natural ones, bias due to selective bacterial ingestion by grazers are limited. Due to tidal cycles, intertidal mudflat constitutes highly variable environment at short time scale. Since those variations may influence...
Tipo: Text Palavras-chave: Stable isotope; Hydrobia ulvae; Foraminifera; Copepod; Nematode; Bacteria; Mudflat; Trophic foodweb; Isotope stable; Hydrobia ulvae; Foraminifère; Copépode; Nématode; Bactérie; Vasière; Réseau trophique.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-4778.pdf
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Distribución batimétrica de foraminíferos bentónicos (Protozoa:Foraminiferida) al sur del estrecho de Magallanes (52°-56°S), Chile OceanDocs
Hromic, Tatiana.
Se analiza la distribución batimétrica de los foraminíferos bentónicos en el área de canales y fiordos, al sur del estrecho de Magallanes, (52-56°S), Chile. Para ello se estudiaron 34 muestras recolectadas en la zona de plataforma (35 - 650 m), durante la expedición CIMAR 3 FIORDOS (1998), organizada por el Comité Oceanográfico Nacional (CONA). Se obtuvieron 21.190 ejemplares los que fueron clasificados en 169 especies; sólo el 8,3% de las especies alcanzaron una representación superior al 2%, por lo cual, se seleccionaron 47 especies, según su abundancia por tramo, para verificar su distribución. Se reconocieron tres asociaciones: a) de aguas someras (0-150 m); en la porción más superficial (50 m) dominaron Buccella frigida, Buliminella elegantissima y...
Tipo: Journal Contribution Palavras-chave: Foraminifera; Bathymetric distribution.
Ano: 2009 URL: http://hdl.handle.net/1834/4176
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Distribución de los foraminíferos bentónicos del Golfo de Guayaquil OceanDocs
Gualancañay, E..
Este trabajo sobre la distribución de los foraminíferos bentónicos del Golfo de Guayaquil, es el complemento de un estudio taxonómico realizado en la misma área, Gualancañay (1983). Durante la expedición científica "Eastwards/76. De acuerdo a los resultados de los análisis cualitativo y de abundancia relativa de las especies de foraminíferos bentónicos del Golfo de Guayaquil, demuestran que esta área pertenece al provincia zoogeográfica panameña propuesta por (Boltovskoy, 1965; Boltovskoy & Gualancañay, 1975; Boltovskoy, 1976; Gualancañay, 1978).
Tipo: Journal Contribution Palavras-chave: Distribution; Foraminifera; Zoogeography; Benthos; Taxonomy; Benthos; Distribution; Taxonomy; Zoogeography; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_15488.
Ano: 1986 URL: http://hdl.handle.net/1834/2178
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Distribución de los foraminíferos bentónicos del Golfo de Guayaquil interior y su relación con algunos factores ambientales OceanDocs
Gualancañay, E..
En la presente investigación se realiza el estudio de algunos factores ambientales: salinidad del agua superficial, turbidez, sedimentos y pH del sedimento, relacionados con las especies de foraminíferos bentónicos identificadas en el Golfo de Guayaquil, durante marzo y septiembre de 1988. Igualmente se realiza la distribución relativa de cada una de las especies halladas en el área.
Tipo: Journal Contribution Palavras-chave: Distribution; Foraminifera; Environmental factors; Distribution; Environmental factors; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_2594.
Ano: 1989 URL: http://hdl.handle.net/1834/2151
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Distribución de Nonionella auris (d'Orbigny) (Foraminiferida) en el golfo San Matías, provincia de Río Negro, Argentina Ameghiniana
Bernasconi,Emiliana; Cusminsky,Gabriela.
Se estudia la influencia del tipo de sedimento y la profundidad en la distribución y desarrollo del foraminífero bentónico Nonionella auris (d'Orbigny). Se analizaron muestras de sedimentos superficiales provenientes del golfo San Matías, provincia de Río Negro, Argentina. Los estudios cualitativos, cuantitativos y estadísticos realizados sugieren que sitios con mayor profundidad, mayor contenido de fango y bajo nivel de energía propiciarían el desarrollo de esta especie.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Foraminifera; Nonionella auris; Distribución; Golfo San Matías; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000100011
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Distribución espacio-temporal del ictioplancton y zooplancton marino en las Islas Galápagos, Ecuador (1988-2001) OceanDocs
Luzuriaga de Cruz, M..
La distribución del ictioplancton y zooplancton alrededor de las Islas Galápagos, 89°W, 92°30'W y 01°N, 02°S, fue realizada con datos e información proveniente de cruceros de investigación entre los años 1988 hasta 2001. Áreas de mayor abundancia de zooplancton e ictioplancton han sido identificadas hacia el norte y sur de Isla Isabela y alrededor de la Isla Fernandina, asociados a la Corriente de Cromwell y afloramiento foraminíferos planctónicos, larvas de eufásidos y copépodos fueron predominantes en las áreas mencionadas. Activa productividad secundaria relacionada con el frente ecuatorial se observó también hacia el sureste de Isabela, este de San Cristóbal y norte de Isla Santiago, con elevados porcentajes (>50%) de Globigerina bulloides...
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Zooplankton; Upwelling; Foraminifera; Abundance; Cruises; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2009 URL: http://hdl.handle.net/1834/3358
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Distribución zoogeográfica de los géneros Cibicides sp., y Quinqueloculina sp., (Foraminíferos) de la zona de turbulencia de Monteverde, Ecuador durante noviembre 2007 OceanDocs
Gualancañay, E..
En el área de Monteverde se ha estudiado por primera vez a los foraminíferos bentónicos de la zona de turbulencia hasta los 20 metros de profundidad, caracterizada por la gran agitación de sus aguas debido a los oleajes y se ha encontrado en todas estaciones a las especies Cibicides bertheloti, f. bouena, Cibicides floridanus, Quinqueloculina lamarckiana y Quinqueloculina granulosa que pertenecen a la provincia zoogeográfica Panamena propuesta por Boltovskoy (1965), Boltovskoy y Gualancañay (1975), Boltovskoy (1976), and Gualancañay (1986).
Tipo: Journal Contribution Palavras-chave: Biogeography; Foraminifera; Zoobenthos; Geographical distribution; Geographical distribution; Biogeography; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_915; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2007 URL: http://hdl.handle.net/1834/2350
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Eastern Tropical Pacific Climate And El Niño Variability During The Past Millennium ArchiMer
Rustic, Gerald Thomas.
The El Niño Southern Oscillation (ENSO) has been implicated in large-scale climate shifts of the past millennia, but paleoclimate records from the dynamically vital eastern equatorial Pacific Ocean (EEP) spanning the past millennium are sparse. This has limited our understanding of tropical Pacific dynamics, leaving questions regarding the source of ENSO variability unanswered. Here I seek to address some of these questions regarding relationship between ENSO and tropical Pacific mean state, and the relationship between the tropical Pacific and large-scale climate. Mean EEP sea surface temperature (SST) for the past millennium was reconstructed using Mg/Ca ratios in Globigerinoides ruber from a sub-centennially resolved sediment core collected near the...
Tipo: Text Palavras-chave: Eastern tropical pacific; ENSO; Foraminifera; Paleoceanography; Paleoclimate.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00495/60657/64154.pdf
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Estructura comunitaria del taxa Foraminiferida (Protozoa), según profundidad, en el fiordo Comau, Chiloé, Chile OceanDocs
Hromic, Tatiana.
La composición de las comunidades foraminiferológicas en sedimentos superficiales de aguas menores a 30 m y mayores a 80 m del fiordo Comau, golfo de Ancud, Chiloé, Chile, aplicando SIMPER, ANOSIM, MDS y análisis de Cluster, muestran una alta diferencia y distinguen dos comunidades: una de aguas someras, en la cual las especies que más contribuyen a la similitud de las muestras son Ammonia beccarii (87,6 %) y Buccella peruviana (4,48 %) y otra de aguas más profundas, en la cual, las especies que más contribuyen a su individualización son: Uvigerina bifurcata (24,8%), Bulimna notovata (21,8%), Bulimina patagonica (14,42%), Nonionella auris (10,11%), Globocassidulina minuta (7,37%), Nonionoides grateloupi (3,94%), Quinqueloculina seminula (3,44%), Buccella...
Tipo: Journal Contribution Palavras-chave: Foraminifera; Bathymetric distribution.
Ano: 2009 URL: http://hdl.handle.net/1834/4166
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Estudio de prolóculus de los foraminíferos bentónicos de la Provincia de Manabí, Ecuador OceanDocs
Gualancañay, E..
El presente trabajo está basado en el estudio del prolóculus de los foraminíferos bentónicos de la plataforma continental superior interna de la Provincia de Manabí, la misma que incluye la zona de turbulencia. El objetivo principal fue el de llegar a establecer las fases de reproducción mediante el estudio del prolóculus de cada uno de los ejemplares analizados.
Tipo: Journal Contribution Palavras-chave: Reproduction; Foraminifera; Reproduction; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1989 URL: http://hdl.handle.net/1834/2148
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