Marine Micropaleontology

Items from 1 to 20 out of 84 results

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Publisher's Note

Marine Micropaleontology > 2004 > 50 > 1-2 > v

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Temporal variability of foraminiferal densities in the northern Adriatic Sea

Ivo Duijnstee, Iwan de Lugt, Henco Vonk Noordegraaf, Bert van der Zwaan

Marine Micropaleontology > 2004 > 50 > 1-2 > 125-148

Over a period of two years (August 1996 to July 1998) foraminiferal abundances have been monitored at two stations in the northern Adriatic Sea. Environmental variables such as oxygen concentrations, salinity and temperature were measured and the trophic state of the seawater at both localities was calculated. Foraminiferal numbers fluctuated considerably during the two years, but not in a straightforward...

article

MicroHistory

Marine Micropaleontology > 2004 > 50 > 1-2 > 1

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Calcareous dinoflagellate cysts in South and equatorial Atlantic surface sediments: diversity, distribution, ecology and potential for palaeoenvironmental reconstruction

Annemiek Vink

Marine Micropaleontology > 2004 > 50 > 1-2 > 43-88

Several marine, peridiniphycidean dinoflagellate species produce calcareous cysts during their life cycle, which are relatively resistant to chemical and physical degradation and are therefore often found in large quantities in oceanic bottom sediments. Although the use of these calcareous cysts as proxies for palaeoenvironmental and palaeoclimatic reconstructions has seen many advances over the last...

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Palynofacies analysis and organic-walled dinoflagellate cysts as indicators of palaeo-hydrographic changes: an example from Holocene sediments in Skalafjord, Faroe Islands

Lucia Roncaglia

Marine Micropaleontology > 2004 > 50 > 1-2 > 21-42

This study documents Holocene variations in organic matter deposition from ca. 6350 cal yr BC to AD 1430 in Skalafjord, Faroe Islands, and uses this information to assess palaeo-hydrographic conditions. The chronology of the interval studied is based on five AMS ¹ ⁴ C ages. Based on the total sedimentary organic content, the sediments dating to ca. 6350 cal yr BC to AD 160 have been deposited...

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Editorial Board

Marine Micropaleontology > 2004 > 50 > 1-2 > iii

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Changes in coiling direction, habitat depth and abundance in two menardellid species

Helen A. Pfuhl, Nicholas J. Shackleton

Marine Micropaleontology > 2004 > 50 > 1-2 > 3-20

We present a detailed study of menardellid speciation, abundance and coiling changes between 6.34 and 5.1 Ma (latest Miocene and earliest Pliocene). Menardellids are widely distributed in tropical to subtropical waters from Miocene to modern time, revealing a stable isotopic signature characteristic for the top of the thermocline and shallower rather than deeper habitat depth. Menardellid response...

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Beyond frontiers and time: the scientific and cultural heritage of Alcide d'Orbigny (1802-1857)

Marie-Thérèse Vénec-Peyré

Marine Micropaleontology > 2004 > 50 > 1-2 > 149-159

Alcide Dessalines d'Orbigny was born on 6 September 1802 in Coueron (near Nantes), France. In his early youth, he developed a life interest in the study of a group of microscopic animals that he named 'Foraminifera'. In his first scientific work, devoted to this group, he established the basis of a new science, micropaleontology. All his life, he worked on foraminifera, but his concern in natural...

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Reconstructing past planktic foraminiferal habitats using stable isotope data: a case history for Mediterranean sapropel S5

E.J. Rohling, M. Sprovieri, T. Cane, J.S.L. Casford, more

Marine Micropaleontology > 2004 > 50 > 1-2 > 89-123

A high-resolution stable O and C isotope study is undertaken on all planktic foraminiferal species that are reasonably continuous through an Eemian sapropel S5 from the western side of the eastern Mediterranean. The data are considered within a context of high-resolution isotope records for two further S5 sapropels from the central and easternmost sectors of the basin, alkenone-based sea surface temperature...

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Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes

K.L. Knudsen, H. Jiang, E. Jansen, J. Eirı́ksson, more

Marine Micropaleontology > 2004 > 50 > 3-4 > 273-305

A combined study of foraminifera, diatoms and stable isotopes in marine sediments off North Iceland records major changes in sea surface conditions since about 15 800 cal years (yr) BP. Results are presented from two gravity cores obtained at about 400 m water depth from two separate sedimentary basins on each side of the submarine Kolbeinsey Ridge. The chronology of the sedimentary record is based...

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High resolution paleoceanography of the Guaymas Basin, Gulf of California, during the past 15 000 years

John A. Barron, David Bukry, James L. Bischoff

Marine Micropaleontology > 2004 > 50 > 3-4 > 185-207

Deep Sea Drilling Project Site 480 (27 ^o 54.10'N, 111 ^o 39.34'W; 655 m water depth) contains a high resolution record of paleoceanographic change of the past 15 000 years for the Guaymas Basin, a region of very high diatom productivity within the central Gulf of California. Analyses of diatoms and silicoflagellates were completed on samples spaced every 40-50 yr, whereas ICP-AES geochemical...

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Oxygen and carbon isotopic variation in co-existing larger foraminifera from a reef flat at Akajima, Okinawa, Japan

Pratul Kumar Saraswati, Koji Seto, Ritsuo Nomura

Marine Micropaleontology > 2004 > 50 > 3-4 > 339-349

The larger foraminiferal assemblage on the reef flat at Akajima (Ryukyu Island Arc) is comprised of Marginopora kudakajimaensis, Amphisorus hemprichii, Sorites orbiculus, Peneroplis planatus, Heterostegina depressa, Neorotalia calcar, Calcarina gaudichaudii, Baculogypsina sphaerulata and Amphistegina lessonii. The oxygen and carbon isotopic variations in several specimens of each species, living under...

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Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages

Xavier Crosta, Arne Sturm, Leanne Armand, Jean-Jacques Pichon

Marine Micropaleontology > 2004 > 50 > 3-4 > 209-223

A Modern Analog Technique (MAT ₅ 201/31) has been applied to fossil diatom assemblages to provide down-core estimates of February sea-surface temperatures (SSTs) and of sea ice duration over the past 220 000 years at 56 ^o 40'S, 160 ^o 14'E. At the core location, sea ice progression lagged the SST drop by ~1 ka at interglacial-glacial transitions, and sea ice retreat was almost...

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Contents List Volume 50

Marine Micropaleontology > 2004 > 50 > 3-4 > 353-354

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Age and preservation of Amphistegina (foraminifera) in Hawaiian beach sand: implication for sand turnover rate and resource renewal

Johanna M. Resig

Marine Micropaleontology > 2004 > 50 > 3-4 > 225-236

Radiocarbon dating of tests of Amphistegina spp. from the surface sand of Hawaiian beaches has revealed ages up to 1500 years or more. Preservation is related to age: the residual umbos are older than the intact tests. The antiquity of some of the tests suggests that predictions of a sand turnover rate of less than 100 years time based on Amphistegina productivity studies are in error and that the...

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Potential use of stable oxygen isotope composition of Thoracosphaera heimii (Dinophyceae) for upper watercolumn (thermocline) temperature reconstruction

Karin Zonneveld

Marine Micropaleontology > 2004 > 50 > 3-4 > 307-317

To investigate the potential use of the stable isotope composition of the vegetative cysts of the photosynthetic dinoflagellate Thoracosphaera heimii for quantitative palaeotemperature reconstructions a method has been developed to purify T. heimii cysts from sediment samples. Stable oxygen and carbon isotopes have been measured on T. heimii cysts from 21 surface sediment samples from the equatorial...

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Editorial Board

Marine Micropaleontology > 2004 > 50 > 3-4 > co2

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Morphological distinction of molecular types in Ammonia - towards a taxonomic revision of the world's most commonly misidentified foraminifera

Bruce W. Hayward, Maria Holzmann, Hugh R. Grenfell, Jan Pawlowski, more

Marine Micropaleontology > 2004 > 50 > 3-4 > 237-271

In this study, morphometric analysis has been performed on 178 Ammonia specimens belonging to 12 different molecular types, plus non-sequenced type specimens of Ammonia beccarii and A. tepida. Molecular type distinction is based on phylogenetic analysis of 267 partial LSU rDNA sequences, obtained from 202 living Ammonia specimens, sampled in 30 localities from 17 countries bordering the Pacific Ocean,...

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Size distribution of Holocene planktic foraminifer assemblages: biogeography, ecology and adaptation

Daniela N. Schmidt, Sabrina Renaud, Jörg Bollmann, Ralf Schiebel, more

Marine Micropaleontology > 2004 > 50 > 3-4 > 319-338

The size of any organism is influenced by the surrounding ecological conditions. In this study, we investigate the effects of such factors on the size spectra of planktic foraminiferal assemblages from Holocene surface sediments. We analyzed assemblages from 69 Holocene samples, which cover the major physical and chemical gradients of the oceans. On a global scale, the range of sizes in assemblages...

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Author Index Volume 50

Marine Micropaleontology > 2004 > 50 > 3-4 > 351-352

Year:
2004

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Volume

53 (24)
52 (18)
51 (21)
50 (21)

Keywords

HOLOCENE (8)
STABLE ISOTOPES (8)
BENTHIC FORAMINIFERA (7)
CALCAREOUS NANNOFOSSILS (7)
PLANKTONIC FORAMINIFERA (7)
DIATOMS (6)
FORAMINIFERA (6)
PALEOCEANOGRAPHY (6)
COCCOLITHS (5)
ECOLOGY (5)
SURFACE SEDIMENTS (4)
PALAEOCEANOGRAPHY (3)
PALEOCLIMATOLOGY (3)
PLEISTOCENE (3)
PLIOCENE (3)
UPWELLING (3)
VERTICAL DISTRIBUTION (3)
ANTARCTICA (2)
BENTHIC FORAMINIFERS (2)
BIOSTRATIGRAPHY (2)
CALCAREOUS NANNOPLANKTON (2)
COCCOLITHOPHORES (2)
CONNECTICUT (2)
DINOFLAGELLATES (2)
EOCENE (2)
ISOTOPES (2)
JAPAN SEA (2)
LATE QUATERNARY (2)
MEDITERRANEAN (2)
MIOCENE (2)
NANNOFOSSILS (2)
NORTHWESTERN PACIFIC (2)
OKHOTSK SEA (2)
PALAEOTEMPERATURE (2)
PALEOECOLOGY (2)
PALEOENVIRONMENT (2)
PLANKTIC FORAMINIFERA (2)
QUATERNARY (2)
SALT-MARSH (2)
SEA-LEVEL CHANGES (2)
SEDIMENTS (2)
SOUTH ATLANTIC (2)
SOUTHERN OCEAN (2)
Δ 1 3 C (1)
ABSOLUTE ABUNDANCE (1)
ALBORAN SEA (1)
AMMONIA (1)
AMPHISTEGINA (1)
ANNUAL DEPOSITS (1)
ANTARCTIC OCEAN (1)
ARABIAN SEA (1)
ARCTIC PALEOENVIRONMENT (1)
ARGENTINA (1)
ATLANTIC OCEAN (1)
AUTOMATIC RECOGNITION (1)
BAY OF BISCAY (1)
BENGUELA CURRENT (1)
BENTHIC CARBON OXIDATION (1)
BENTHIC OSTRACODS (1)
BENTHONIC FORAMINIFERA (1)
BIOCHRONOLOGY (1)
BIOGENIC SILICA (1)
BIOGEOGRAPHY (1)
BIOLOGICAL CYCLES (1)
BIOMETRY (1)
BISCUTACEAE (1)
BRINE BASIN (1)
BULIMINIDS (1)
CALCAREOUS DINOFLAGELLATE CYSTS (1)
CALCAREOUS-WALLED DINOFLAGELLATE CYSTS (1)
CARBON ISOTOPES (1)
CENOMANIAN (1)
CENOMANIAN-TURONIAN (1)
CENTRAL ATLANTIC (1)
CENTRAL MEDITERRANEAN SEA (1)
CHLOROPHYLL-A CONCENTRATIONS (1)
COCCOLITH CARBONATE (1)
COCCOLITHOPHORE BLOOMS (1)
COCCOLITHUS PELAGICUS (1)
COILING (1)
CONTINENTAL SHELF (1)
CORAL REEF (1)
CORRESPONDENCE ANALYSIS (1)
CRETACEOUS (1)
CRYOPHILIC SPECIES (1)
DEEP-SEA BENTHIC FORAMINIFERA (1)
DEPTH DISTRIBUTION (1)
DIAGENESIS (1)
DIATOM FLORA (1)
DISSOLUTION (1)
EARTH'S ORBITAL FORCING (1)
EASTERN NORTH ATLANTIC (1)
EMILIANIA HUXLEYI (1)
ENVIRONMENTAL CHANGES (1)
ENVIRONMENTAL PARAMETERS (1)
EOCENE-OLIGOCENE (1)
EQUATORIAL ATLANTIC (1)
ESTUARINE DEPOSITIONAL ENVIRONMENTS (1)
ESTUARINE FORAMINIFERA (1)
EUTROPHICATION (1)
more

INFONA - science communication portal

Marine Micropaleontology

Publisher's Note

Temporal variability of foraminiferal densities in the northern Adriatic Sea

MicroHistory

Calcareous dinoflagellate cysts in South and equatorial Atlantic surface sediments: diversity, distribution, ecology and potential for palaeoenvironmental reconstruction

Palynofacies analysis and organic-walled dinoflagellate cysts as indicators of palaeo-hydrographic changes: an example from Holocene sediments in Skalafjord, Faroe Islands

Editorial Board

Changes in coiling direction, habitat depth and abundance in two menardellid species

Beyond frontiers and time: the scientific and cultural heritage of Alcide d'Orbigny (1802-1857)

Reconstructing past planktic foraminiferal habitats using stable isotope data: a case history for Mediterranean sapropel S5

Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes

High resolution paleoceanography of the Guaymas Basin, Gulf of California, during the past 15 000 years

Oxygen and carbon isotopic variation in co-existing larger foraminifera from a reef flat at Akajima, Okinawa, Japan

Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages

Contents List Volume 50

Age and preservation of Amphistegina (foraminifera) in Hawaiian beach sand: implication for sand turnover rate and resource renewal

Potential use of stable oxygen isotope composition of Thoracosphaera heimii (Dinophyceae) for upper watercolumn (thermocline) temperature reconstruction

Editorial Board

Morphological distinction of molecular types in Ammonia - towards a taxonomic revision of the world's most commonly misidentified foraminifera

Size distribution of Holocene planktic foraminifer assemblages: biogeography, ecology and adaptation

Author Index Volume 50

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