RECENT PUBLICATIONS ON FORAMINIFERA 2013 (1)

From Foraminifera
Jump to: navigation, search

RECENT PUBLICATIONS ON FORAMINIFERA | 2013 (1) | 2012 (6) | 2012 (5) | 2012 (4) | 2012 (3) | 2012 (2) | 2012 (1) | 2011 (5) | 2011 (4) | 2011 (3) | 2011 (2) | 2011 (1) | 2010

BIOFACIES IN A SANTONIAN-CAMPANIAN SUBMARINE FAN SYSTEM IN THE VØRING BASIN (OFFSHORE NORWAY)

Marine and Petroleum Geology front.gif

Foraminiferal assemblages from a Santonian–Campanian submarine fan system in the northwestern Vøring Basin, offshore Norway were investigated with the primary objectives to document the stratigraphic ranges of foraminiferal taxa calibrated with dinoflagellate cysts, and to interpret foraminiferal biofacies of different fan sub-environments previously proposed based on the analysis of ichnofossils. ......
Highlights ► Santonian–Campanian age estimation based on palynology and foraminifera. ► Oxygenated, mesotrophic, bathyal environments based on the morphogroup analysis. ► Agglutinated foraminiferal biofacies in a Late Cretaceous submarine fan system. ► The biofacies of channel sub-environments distinguished from the others. (ABSTRACT)


Setoyama, E., Radmacher, W., Kaminski, M.A. and Tyszka, J., 2013. Foraminiferal and palynological biostratigraphy and biofacies from a Santonian–Campanian submarine fan system in the Vøring Basin (offshore Norway). Marine and Petroleum Geology 43, 396-408.


TRACE ELEMENT POLLUTION - THE CASE STUDY OF THE GULF OF MILAZZO, NE SICILY

The response of benthic foraminiferal assemblages to trace element pollution in the marine sediments of the Gulf of Milazzo (north-eastern Sicily) was investigated. Since the 1960s, this coastal area has been a preferred site for the development of two small marinas and a commercial harbour as well as for heavy industry. Forty samples collected in the uppermost 3–4 cm of an undisturbed layer of sediment in the littoral environment were used for this benthic foraminiferal analysis. The enrichment factors (EFs) of selected trace elements (As, Co, Cr, Cu, Mn, Ni, Pb and Zn) were also calculated. Changes both in benthic foraminiferal assemblages and in some trace elements concentrations have provided evidence that the gulf’s littoral zone can be subdivided into three sectors characterised by environmental changes in the marine ecosystem. ...... Deformed foraminifera, with percentages up to 7.14 %, were found in all three of the sectors. Differences in benthic foraminiferal assemblages, coupled with results from statistical analysis, indicate that anthropogenic trace element pollution could be considered as one of the most important causes of the modifications of foraminiferal assemblages in the study area. (ABSTRACT)


Cosentino, C., Pepe, F., Scopelliti, G., Calabrò, M., Caruso, A., 2013. Benthic foraminiferal response to trace element pollution—the case study of the Gulf of Milazzo, NE Sicily (Central Mediterranean Sea). Environmental Monitoring and Assessmet, doi:10.1007/s10661-013-3292-2


THE LITTLE ICE AGE: EVIDENCE FROM A SEDIMENT RECORD IN GULLMAR FJORD, SWEDEN

Biogeosciences front.jpg

We discuss the climatic and environmental changes during the last millennium in NE Europe based on a ca. 8-m long high-resolved and well-dated marine sediment record from the deepest basin of Gullmar Fjord (SW Sweden). According to the 210Pb- and 14C-datings, the record includes the period of the late Holocene characterised by anomalously cold summers and well-known as the Little Ice Age (LIA). Using benthic foraminiferal stratigraphy, lithology, bulk sediment geochemistry and stable carbon isotopes we reconstruct various phases of the cold period, identify its timing in the study area and discuss the land–sea interactions occurring during that time. The onset of the LIA is indicated by an increase in cold-water foraminiferal species Adercotryma glomerata at ~ 1350 AD The first phase of the LIA was characterised by a stormy climate and higher productivity, which is indicated by a foraminiferal unit of Nonionella iridea and Cassidulina laevigata. ...... (ABSTRACT)


Asteman, I.P., Nordberg, K., Filipsson, H.L., 2013. The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast. Biogeosciences 10, 1275-1290.


TIMING AND SIZE SELECTIVITY OF THE GUADALUPIAN FUSULINOIDEAN EXTINCTION

Journal Of Paleontology cover.jpg

A comprehensive, high resolution stratigraphic database of fusulinoidean foraminifers reveals that this group of protists suffered extreme losses during the Guadalupian extinction. Most species (88%) were eliminated gradually over the course of 9 myr during the Wordian and Capitanian ages. A pulse of greatly elevated per capita extinction frequency occurred during the last million years of the Capitanian (260–259 Ma). Contrary to prevailing opinion, the end-Capitanian event did not preferentially eliminate large, morphologically complex species in the families Schwagerinidae and Neoschwagerinidae, because most species in those families were already extinct. Rather, 69 percent of the species eliminated at the end of the Capitanian were small, morphologically conservative representatives of the Ozawainellidae, Schubertellidae and Staffellidae. ...... The end-Capitanian extinction pulse might reflect environmental deterioration from the combined effects of global cooling, Emeishan effusive volcanism and sea-level lowstand. (ABSTRACT)


Groves, J.R., Wang, Y., 2013. Timing and Size Selectivity of the Guadalupian (Middle Permian) Fusulinoidean Extinction. Journal of Paleontology 87 (2), 183-196.


THE OLDEST RECORD OF A BORING FORAMINIFER

Lethaia Cover.gif

The bioeroding foraminifer Troglotella incrustans Wernli and Fookes (Bolletino della Societa Paleontologica Italiana 31, 1992, 95), is widely reported from Bajocian?, and Oxfordian to Lower Cenomanian (with a Late Jurassic acme) shallow-water limestones of the Tethyan realm. A single specimen of a boring foraminifer, assigned to T. incrustans, has now been observed from the Lower Permian (Sakmarian) Community Pit Formation of the Doña Ana Mountains, New Mexico, USA. Surviving the end-Permian mass extinction, T. incrustans might be a Lazarus taxon that persisted in refuges. This finding represents the oldest record of a foraminifer exhibiting an euendolithic way of life. Boring foraminifera have not been previously recorded from strata older than the Jurassic. Boring traces of potentially foraminiferan origin, however, have been already reported from the Lower Carboniferous (?Ordovician). (ABSTRACT)


Schlagintweit, F., Krainer, K., Lucas, S.G., 2013. The oldest record of a boring foraminifer: Early Permian of New Mexico, USA. Lethaia 46 (2), 245-250.


BASAL FORAMINIFERA AND GROMIIDS AT THE HÅKON-MOSBY MUD VOLCANO (BARENTS SEA SLOPE)

We describe the occurrence of basal (‘primitive’) foraminifera and gromiids (a distinct taxon related to the foraminifera) in different bathyal habitats of the Håkon Mosby Mud Volcano (HMMV, Barents Sea). ...... The number of basal foraminiferal and gromiid morphospecies varied considerably from site to site. It was relatively high north of the volcano (42 morphospecies in 4 samples) and in the ‘warm centre’ (28 morphospecies in 2 samples), somewhat lower southwest of the volcano (at least 13 morphospecies in 2 samples) and in the siboglinid field (14 morphospecies in three samples), and substantially reduced in the bacterial mat area (5 morphospecies in 6 samples). ...... Saccamminid sp. 5, by far the most common species in our samples, belongs to a ‘lamp-like’ morphotype that is widely distributed in the oceans. The wall structure, and the presence of what appears to be an internal partition across the base of the neck, is reminiscent of some komokiaceans. (ABSTRACT)


Gooday, A.J., Kamenskaya, O.E., Soltwedel, T., in press. 'Basal foraminifera and gromiids (Protista) at the Håkon-Mosby Mud Volcano (Barents Sea slope). Marine Biodiversity, doi:10.1007/s12526-013-0148-5


Siphodinarella costata, A NEW BENTHIC FORAMINIFER FROM THE CONIACIAN OF THE ADRIATIC CARBONATE PLATFORM

A new benthic foraminifer is described as Siphodinarella costata n. gen., n. sp. from Coniacian shallow-water platform-interior carbonates of Slovenia and Croatia. The new foraminifer is found in skeletal wackestone in association with small benthic foraminifera, thaumatoporellaceans, and calcimicrobes (Decastronema, Girvanella-type tubes). The existence of an internal siphon in Siphodinarella n. gen. is interpreted as an entosolenian tube and discussed in terms of its generic and suprageneric importance.

(ABSTRACT)


Schlagintweit, F., Husinec, A., Jež, J., in press. Siphodinarella costata n. gen., n. sp., a new benthic foraminifer from the Coniacian of the Adriatic Carbonate Platform (Slovenia, Croatia). Facies, doi:10.1007/s10347-013-0365-1


FORAMINIFERA IN THE JURASSIC CORAL-BEARING LIMESTONES OF THE VRSATEC AREA, SLOVAK PIENINY KLIPPEN BELT

GeologicaCarpathica front.jpg

The paper deals with benthic foraminifera occurring with the scleractinian corals in the Jurassic biohermal and peribiohermal coral-bearing limestones of the Vrsatec area (Czorsztyn Succession, Slovak Pieniny Klippen Belt). The coral community is dominated by branching forms of the genus Thecosmilia. Co-occurring abundant benthic foraminifera belong to the species Rumanolina seiboldi, R. elevata, Paalzowella turbinella and Troglotella incrustans. The coral-bearing limestones were initially assigned to the Oxfordian on the basis of the microfacies analyses and bivalve and scleractinian faunas. In recent papers they are assigned to the Bajocian on the basis of ammonites found in the neptunic dykes and stratigraphic superimposition criteria. However, the stratigraphic distribution of the majority of the identified foraminifera indicates that like most scleractinian coral taxa they are not known earlier than in the Late Jurassic. The Late Jurassic age of these coral-bearing limestones is also suggested by an encrusting microproblematic organism Iberopora bodeuri. (ABSTRACT)


Morycowa, E., Olszewska, B., 2013. Foraminiferal assemblage in the coral-bearing limestones of the Vrsatec area (Pieniny Klippen Belt, Western Carpathians, Slovakia). Geologica Carpathica 64(1), 63-69.


CAN ABUNDANCE OF PROTISTS BE INFERRED FROM SEQUENCE DATA

PLoS ONE.jpg

Protists are key players in microbial communities, yet our understanding of their role in ecosystem functioning is seriously impeded by difficulties in identification of protistan species and their quantification. Current microscopy-based methods used for determining the abundance of protists are tedious and often show a low taxonomic resolution. Recent development of next-generation sequencing technologies offered a very powerful tool for studying the richness of protistan communities. Still, the relationship between abundance of species and number of sequences remains subjected to various technical and biological biases. Here, we test the impact of some of these biological biases on sequence abundance of SSU rRNA gene in foraminifera. ...... (ABSTRACT)


Weber, A.A.-T., Pawlowski, J., 2013. Can Abundance of Protists Be Inferred from Sequence Data: A Case Study of Foraminifera. PLoS ONE 8(2), e56739. doi:10.1371/journal.pone.0056739


DEEP RELATIONSHIPS OF RHIZARIA REVEALED BY PHYLOGENOMICS

Molecular Phylogenetics and Evolution.gif

Rhizaria is one of the six supergroups of eukaryotes, which comprise the majority of amoeboid and skeleton-building protists living in freshwater and marine ecosystems. There is an overall lack of molecular data for the group and therefore the deep phylogeny of rhizarians is unresolved. Molecular data are particularly scarce for the clade of Retaria, which include two prominent groups of microfossils: foraminiferans and radiolarians. To fill this gap, we have produced and sequenced EST libraries for 14 rhizarian species including seven foraminiferans, Gromia and six taxa belonging to traditional Haeckel’s Radiolaria: Acantharea, Polycystinea, and Phaeodarea. ...... In view of our study, Haeckel’s Radiolaria appears as both, a polyphyletic and paraphyletic assemblage of independent groups that should be considered as separate lineages in protist classification. (ABSTRACT)


Sierra, R., Matz, M.V., Aglyamova, G., Pillet, L., Decelle, J., Not, F., de Vargas, C., Pawlowski, J., 2013. Deep relationships of Rhizaria revealed by phylogenomics: A farewell to Haeckel’s Radiolaria. Molecular Phylogenetics and Evolution 67 (1), 53-59.


CLIMATE-DRIVEN RANGE EXTENSION OF Amphistegina

PLoS ONE.jpg

Species-range expansions are a predicted and realized consequence of global climate change. Climate warming and the poleward widening of the tropical belt have induced range shifts in a variety of marine and terrestrial species. Range expansions may have broad implications on native biota and ecosystem functioning as shifting species may perturb recipient communities. Larger symbiont-bearing foraminifera constitute ubiquitous and prominent components of shallow water ecosystems, and range shifts of these important protists are likely to trigger changes in ecosystem functioning. We have used historical and newly acquired occurrence records to compute current range shifts of Amphistegina spp., a larger symbiont-bearing foraminifera, along the eastern coastline of Africa and compare them to analogous range shifts currently observed in the Mediterranean Sea. ...... (ABSTRACT)


Langer, M.R., Weinmann, A.E., Lötters, S., Bernhard, J.M., Rödder, D., 2013. Climate-Driven Range Extension of Amphistegina (Protista, Foraminiferida): Models of Current and Predicted Future Ranges. PLoS ONE 8(2), e54443. doi:10.1371/journal.pone.0054443


CLADOGENESIS IN MACROEVOLUTION BY INTEGRATING FOSSIL AND MOLECULAR EVIDENCE

PNAS front.gif

Assessing the extent to which population subdivision during cladogenesis is necessary for long-term phenotypic evolution is of fundamental importance in a broad range of biological disciplines. Differentiating cladogenesis from anagenesis, defined as evolution within a species, has generally been hampered by dating precision, insufficient fossil data, and difficulties in establishing a direct link between morphological changes detectable in the fossil record and biological species. Here we quantify the relative frequencies of cladogenesis and anagenesis for macroperforate planktic Foraminifera, which arguably have the most complete fossil record currently available, to address this question. Analyzing this record in light of molecular evidence, while taking into account the precision of fossil dating techniques, we estimate that the fraction of speciation events attributable to anagenesis is <19% during the Cenozoic era (last 65 Myr) and <10% during the Neogene period (last 23 Myr). Our central conclusion—that cladogenesis is the predominant mode by which new planktic Foraminifera taxa become established at macroevolutionary time scales—differs markedly from the conclusion reached in a recent study based solely on fossil data. These disparate findings demonstrate that interpretations of macroevolutionary dynamics in the fossil record can be fundamentally altered in light of genetic evidence.

(ABSTRACT)


Strotz, L.C., Allen, A.P., in press. Assessing the role of cladogenesis in macroevolution by integrating fossil and molecular evidence. PNAS, doi: 10.1073/pnas.1208302110


LIVING BENTHIC FORAMINIFERA FROM THE CAP-FERRET CANYON: A COMPARISON BETWEEN THE CANYON AXIS AND THE SURROUNDING AREAS

DeepSeaResearch I front.gif

Living (Rose Bengal stained) benthic foraminiferal faunas were investigated at 13 deep-sea stations sampled in the Cap-Ferret Canyon area (NE Atlantic). One station (151 m) is located on the continental shelf close to the canyon head. All other stations are located along 2 bathymetric transects: 7 sites along the canyon axis with depths ranging from 300 to 3000 m and 5 stations along the adjacent flank with depths ranging from 300 m to 2000 m. ......
Highlights ► Live benthic foraminifera were studied at 13 stations in the Cap-Ferret Canyon. ► Fauna from the canyon axis were compared with live communities from adjacent areas. ► Geochemical data (e.g. OM composition) were used to described faunal distributions. ► Density and diversity along the canyon axis are higher than on the adjacent flank. ► This canyon shows lower density but higher diverse and complex fauna than Cap-Breton.

(ABSTRACT)


Duros, P., Fontanier, C., Metzger, E., Cesbron, F., Deflandre, B., Schmidt, S., Buscail, R., Zaragosi, S., Kerhervé, P., Rigaud, S., Delgard, M.-L., Jorissen, F.J., in press. Live (stained) benthic foraminifera from the Cap-Ferret Canyon (Bay of Biscay, NE Atlantic): A comparison between the canyon axis and the surrounding areas. Deep Sea Research I, http://dx.doi.org/10.1016/j.dsr.2013.01.004


WESTERN PACIFIC THERMOCLINE STRUCTURE AND THE PACIFIC MARINE ITCZ DURING THE LGM

EarthPlanetarySciLetters front.gif

Paleoclimate proxy evidence suggests a southward shift of the Intertropical Convergence Zone (ITCZ) during times of Northern Hemisphere cooling, including the Last Glacial Maximum, 19–23 ka before present. However, evidence for movement over the Pacific has mainly been limited to precipitation reconstructions near the continents, and the position of the Pacific marine ITCZ is less well constrained. In this study, we address this problem by taking advantage of the fact that the upper ocean density structure reflects the overlying wind field. We reconstruct changes in the upper ocean density structure during the LGM using oxygen isotope measurements on the planktonic foraminifera G. ruber and G. tumida in a transect of sediment cores from the Western Tropical Pacific. The data suggests a ridge in the thermocline just north of the present-day ITCZ persists for at least part of the LGM, and a structure in the Southern Hemisphere that differs from today. The reconstructed structure is consistent with that produced in a General Circulation Model with both a Northern and Southern Hemisphere ITCZ. (ABSTRACT)


Leech, P.J., Lynch-Stieglitz, J., Zhang, R., 2013. Western Pacific thermocline structure and the Pacific marine Intertropical Convergence Zone during the Last Glacial Maximum. Earth and Planetary Science Letters 363, 133-143.


DEFINING PAST ECOLOGICAL STATUS AND in situ REFERENCE CONDITIONS USING BENTHIC FORAMINIFERA

Characterizing marine water bodies and defining ecological status, both present and past (pre-impacted), has become an important task for EU's Member States and their associates during the last decade due to the implementation of the Water Framework Directive (WFD). However, none of the methods used to define Ecological Quality Status (EcoQS) are able to accurately define the status for both the present-day and reference conditions at a given site (i.e., in situ). Recent studies have revealed a significant correlation between the diversity of living (stained) fossilizable benthic foraminifera (protists) and associated environmental parameters (e.g., dissolved oxygen concentration). The present study takes this relationship a step further by applying methods used to define present-day EcoQS on fossil benthic foraminiferal assemblages and, thereby, defining past EcoQS (PaleoEcoQS). ...... (ABSTRACT)


Dolven, J.K., Alve, E., Rygg, B., Magnusson, J., 2013. Defining past ecological status and in situ reference conditions using benthic foraminifera: A case study from the Oslofjord, Norway. Ecological Indicators 29, 219-233. .


LATE CRETACEOUS FORAMINIFERA FROM THE RIO DEL REY BASIN, SW CAMEROON

Campanian–Maastrichtian marine sediments outcrop in five genetically linked sedimentary basins along the West African coast in the Gulf of Guinea, from the Douala Basin in Cameroon to the Anambra Basin in Nigeria. These sediments in the more centrally located Rio del Rey Basin have been the least studied. Therefore, the geologic history of this region has merely been speculative. The Rio del Rey Basin like the adjacent Niger Delta is producing hydrocarbon from the offshore Tertiary sedimentary interval in which all studies have been focused, neglecting the onshore Cretaceous sediments. Outcrops in the basin are rare, small and highly weathered. Samples from some of these sediments have yielded a few Planktonic and dominantly benthonic foraminiferal assemblages. ...... (ABSTRACT)


Njoh, O.A., Victor, O., Christopher, A., 2013. Campano–Maastrichtian foraminifera from onshore sediments in the Rio del Rey Basin, Southwest Cameroon. Journal of African Earth Sciences 79, 157-164.


THE RASC AND CASC PROGRAMS FOR RANKING, SCALING AND CORRELATION OF BIOSTRATIGRAPHIC EVENTS

RASC is an acronym for RAnking and SCcaling of biostratigraphic events. Code of the RASC computer program was originally published in Computers & Geosciences. During the past 30 years this program has been continuously maintained and updated. Its purpose is to combine biostratigraphic data from land-based sections or exploratory wells drilled in sedimentary basins to construct a regional biozonation that can be used for correlation between sections within a study area. Different methods of quantitative stratigraphy are briefly reviewed in this paper. Ranking is illustrated by application to a simple, artificial dataset. Scaling is explained as a refinement of ranking. Implications of sampling of stratigraphic sections are discussed in detail. Several examples of past successful large-scale RASC applications are given. These include results for well data from the Cenozoic North Sea basin, northwestern Atlantic margin and the Cretaceous seaway between Norway and Greenland. Paleoceanographic interpretations of RASC biozonations supplemented by analysis of variance and correlations between wells are exemplified as well. History of program development is summarized in an Appendix. (ABSTRACT)


Agterberg, F.P., Gradstein, F.M., Cheng, Q., Liu, G., in press. The RASC and CASC programs for ranking, scaling and correlation of biostratigraphic events. Computers & Geosciences, http://dx.doi.org/10.1016/j.cageo.2013.01.002


THE FORAMINIFERA FROM THE BAZARUTO ARCHIPELAGO (MOZAMBIQUE)

NeuesJahrbuch front.jpeg

The Bazaruto Archipelago in the western Indian Ocean is home to a diverse reef biota and a notable tourist attraction along the coast of Mozambique. Analyses of shallow-water reefal and lagoonal sediments from Bazaruto Island reveal two diverse assemblages of benthic foraminifera. The assemblages occupy three major environments and sedimentary regimes and are indicative of reef, channel and lagoon facies. Species richness, Fisher a analyses, assemblage composition, and percentage abundances of larger-symbiont-bearing foraminifera are mirrored in the cluster analyses. ...... Thus, the autochthonous benthic assemblages may preserve the original community structure and sufficient environmental information to be useful indicators for paleoecological studies. (ABSTRACT)


Langer, M.R., Thissen, J.M., Makled, W.A., Weinmann, A.E. 2013. The foraminifera from the Bazaruto Archipelago (Mozambique). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 267 (2), 155-170.


GLOBAL BIOGEOGRAPHIC DISTRIBUTION OF MORPHOSPECIES OF LIVING BENTHIC FORAMINIFERA

JMicro front.gif

Previous studies have investigated regional distribution but this is the first attempt to investigate the global biogeographical distribution of individual morphospecies of living/stained smaller benthic foraminifera. From 8032 samples collected between 1952 and 2011 data have been gathered on the relative abundance of >120 species in five major environments ranging from marsh to deep sea. There is a spectrum of six groups of species with abundance ranging from very high (Group 1) to extremely low (Group 6). ...... Individual species are shown to occupy a range of environments with very few being confined to a single environment (usually either marsh or deep sea). Some species occur in several oceans while others are confined to just one. There is no correlation between species abundance and being either widely or narrowly distributed. ...... Patterns of biogeography have application to ecology, palaeoecology and taxonomy. (ABSTRACT)


Murray, J.W., 2013. Living benthic foraminifera: biogeographical distributions and the significance of rare morphospecies. Journal of Micropalaeontology 32 (1), 1-58.


1ST EXAMPLE WHERE THE MORPHOGLOCIAL VARIABILITY IN A MORPHOSPECIES EXCEEDS ITS rDNA GENETIC VARIABILITY

Paleobiology cover.jpg

Previous genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. ...... This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record. (ABSTRACT)


André, A., Weiner, A., Quillévér´, F., Aurahs, R., Morard, R., Douady, C., de Garidel-Thoron, T., Escarguel, G., de Vargas, C., Kucera, M., 2013. The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer. Paleobiology 39 (1), 21-39.


CALCIUM CARBONATE PRESERVATION VS. CLIMATE CHANGE OVER THE LAST 2400 YRS IN THE FRAM STRAIT

Marine Micropaleontology Front.gif

We present a high-resolution study of planktic foraminiferal distribution patterns in a deep sea core from the eastern Fram Strait (position 78° 55′ N; 06° 46′ E; water depth 1497 m). The sediment core is located below Atlantic water masses flowing into the Arctic Ocean and spans the last 2400 years. The investigation is based on planktic foraminiferal species distribution, stable isotopes, and sedimentological data. The mean shell weight of Neogloboquadrina pachyderma, %fragmentation, organic and inorganic carbon content and the presence of benthic organic linings were also investigated as an indication of preservation changes. ......
Highlights ► Paleoceanograpy and preservation of planktic foraminifera, eastern Fram Strait. ► Dissolution of CaCO3 over the last 2400 years due to high organic productivity. ► Preservation of small dissolution-prone species at the core top (last 100 years). ► Overestimation of the last century sea surface warming due to dissolution effects. (ABSTRACT)


Zamelczyk, K., Rasmussen, T.L., Husum, K., Hald, M., in press. Marine calcium carbonate preservation vs. climate change over the last two millennia in the Fram Strait: Implications for planktic foraminiferal paleostudies. Marine Micropaleontology, http://dx.doi.org/10.1016/j.marmicro.2012.10.001


TOWARDS RADIOCARBON DATING OF SINGLE FORAMINIFERA WITH A GAS ION SOURCE

Carbonate shells from foraminifera are often analysed for radiocarbon to determine the age of deep-sea sediments or to assess radiocarbon reservoir ages. However, a single foraminiferal test typically contains only a few micrograms of carbon, while most laboratories require more than 100 μg for radiocarbon dating with an accelerator mass spectrometry (AMS) system. The collection of the required amount of foraminifera for a single analyses is therefore time consuming and not always possible. Here, we present a convenient method to measure the radiocarbon content of foraminifera using an AMS system fitted with a gas ion source. ...... (ABSTRACT)


Wacker, L., Lippold, J., Molnár, M., Schulz, H., 2013. Towards radiocarbon dating of single foraminifera with a gas ion source. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 294, 307-310.


HIGH RESOLUTION BIOSTRATIGRAPHY OF THE C-T INTERVAL (OAE2) IN NORTH-CENTRAL TUNISIA

High-resolution foraminiferal biostratigraphic analysis has been undertaken on the Bahloul Formation, in Bargou, Jerisa, Guern Halfaya (Central Tunisia), Kherij (North-eastern Tunisia) and Gafsa (southern Tunisia) sections, which prove the preservation of the worldwide expression of the Cenomanian–Turonian transition (C–T) Oceanic Anoxic Event (OAE2). This study confirms that the OAE2 was rather a long-term global event. The high resolution biostratigraphical analysis has allowed subdividing the Whiteinella archaeocretacea zone of the standard biostratigraphic scheme. ...... (ABSTRACT)


Zaghbin-Turki, D., Soua, M., 2013. High resolution biostratigraphy of the Cenomanian–Turonian interval (OAE2) based on planktonic foraminiferal bioevents in North-Central Tunisia. Journal of African Earth Sciences 78, 97-108.


SYMBIONT 'BLEACHING' IN PLANKTIC FORAMINIFERA DURING MIDDLE EOCENE CLIMATIC OPTIMUM

Geology cover.gif

Many genera of modern planktic foraminifera are adapted to nutrient-poor (oligotrophic) surface waters by hosting photosynthetic symbionts, but it is unknown how they will respond to future changes in ocean temperature and acidity. Here we show that ca. 40 Ma, some fossil photosymbiont-bearing planktic foraminifera were temporarily 'bleached' of their symbionts coincident with transient global warming during the Middle Eocene Climatic Optimum (MECO). ...... Our findings show that host-photosymbiont interactions are not constant through geological time, with implications for both the evolution of trophic strategies in marine plankton and the reliability of geochemical proxy records generated from symbiont-bearing planktic foraminifera. (ABSTRACT)


Edgar, K.M., Bohaty, S.M., Gibbs, S.J., Sexton, P.F., Norris, R.D., Wilson, P.A., in press. Symbiont 'bleaching' in planktic foraminifera during the Middle Eocene Climatic Optimum. Geology, doi: 10.1130/G33388.1


MULTISPIRAL GROWTH IN Nummulites

Marine Micropaleontology Front.gif

An analysis of multispiral growth in Eocene nummulitids was performed. The ontogeny of some multispiral specimens was reconstructed, quantified and modelled, and the occurrence of multispiral growth in the different Nummulites and Assilina species has been reviewed. The results showed that all larger species display multispiral growth. ...... The gigantic sizes of 5 to 15 cm reached by Nummulites are produced mainly by the increase in growth rate provided by multispiral growth, and only secondarily by an increase in longevity that is thought to be of less than 6 years. The current view of larger foraminifera as slow growing, long-living, extreme K-strategists is questioned and discussed. (ABSTRACT)


Ferràndez-Cañadell, C., in press. Multispiral growth in Nummulites. Paleobiological implications. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.09.001


LATE EARLY OLIGOCENE BENTHIC FORAMINIFERA IN THE EASTERN EQUATORIAL PACIFIC

Marine Micropaleontology Front.gif

We documented new data on the late early Oligocene benthic foraminifera and sediment geochemistry in the eastern Equatorial Pacific Ocean (EEP) from Integrated Ocean Drilling Program (Exp. 320) Site U1334 (paleo-water depth: ~ 3650 to ~ 3850 m) with some published data on those from Ocean Drilling Program (Leg 199) Sites 1218 (~ 3850 to ~ 4000 m) and 1219 (~ 4270 to ~ 4370 m) in order to understand the response of abyssal benthic foraminifera to paleoceanographic conditions during the interval ~ 32–28 Ma. ......
Highlights ► Benthic foraminifera in the eastern Equatorial Pacific Ocean ► Documentation of abyssal benthic foraminifera during ~ 32 to ~ 28 Ma ► Characteristics of abundant common taxa of benthic foraminifera ► Influence of Southern Component Water at the Oi-2 event. (ABSTRACT)


Takata, H., Nomura, R., Tsujimoto, A., Khim, B.-K., in press. Late early Oligocene deep-sea benthic foraminifera and their faunal response to paleoceanographic changes in the eastern Equatorial Pacific. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.09.002


DIVERSITY AND MICROHABITATS OF LIVING BENTHIC FORAMINIFERA IN THE ABYSSAL NE PACIFIC

Marine Micropaleontology Front.gif

We investigated assemblages of living benthic foraminifera (> 63 μm) from replicate samplesat Station M in the abyssal Northeast Pacific. Push cores collected in September 2007 (StatM07) and May 2009 (StatM09) from 3953 m depth were examined for population densities, species composition, and vertical occurrence within the sediment. ...... The majority of species displayed an epifaunal or shallow-infaunal habitat. The observed vertical distribution patterns, species diversity, and assemblage composition are similar to other abyssal North Pacific assemblages and reflect the level of organic flux at Station M.
Highlights ► Diverse and individual-rich community of deep-sea foraminifera in the Northeast Pacific. ► Soft-walled monothalamous saccamminids dominate the community numerically. ► Assemblage composition and depth distribution of species resemble other abyssal settings . (ABSTRACT)


Enge, A., Kucera, M., Heinz, P., in press. Diversity and microhabitats of living benthic foraminifera in the abyssal Northeast Pacific. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.08.004


THE MIDDLE CENOMANIAN EVENT IN THE EQUATORIAL ATLANTIC

Marine Micropaleontology Front.gif

In addition to Oceanic Anoxic Event 2 (OAE2), other perturbations of the carbon cycle occurred during the Cenomanian and Turonian, of which the Middle Cenomanian Event (MCE) is the most prominent one. In palaeoecological publications, however, this event is strongly underrepresented in contrast to the well-studied OAE2. In order to fill this gap, we have studied Early Cenomanian to Late Turonian calcareous nannofossil and benthic foraminiferal assemblages of Ocean Drilling Program Site 1260 at Demerara Rise (western equatorial North Atlantic), in order to decipher biotic changes throughout this interval and especially across the MCE. ......
Highlights ► Quantitative nannofossil data for the Middle Cenomanian Event (MCE) are presented. ► Long-lasting change of nannofossil- and benthic foraminiferal communities observed. ► The MCE is characterised by the onset of intensified water-column stratification. ► The MCE shows less speciations/extinctions than Oceanic Anoxic Event 2 (OAE2). (ABSTRACT)


Hardas, P., Mutterlose, J., Friedrich, O., Erbacher, J., in press. The Middle Cenomanian event in the equatorial Atlantic: The calcareous nannofossil and benthic foraminiferal response. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.08.003


BURDIGALIAN INFILL OF THE PUCHKIRCHEN TROUGH (NORTH ALPINE FORELAND BASIN, CENTRAL PARATETHYS)

Marine and Petroleum Geology front.gif

To improve the prediction of gas and oil in strata along the tectonically imbricated southern margin of the Puchkirchen Trough (North Alpine Foreland Basin, Central Paratethys), a better understanding of facies distribution and stratigraphic control of the basin is essential. The present study provides bio- and chemofacies analyses and a biostratigraphic evaluation for the pelitic Hall Formation from the borehole Hochburg 1 in the central part of the Puchkirchen Trough. A statistical evaluation of benthic foraminiferal assemblages together with geochemical proxy records (TOC, sulfur, hydrogen index, δ13CTOC, δ15NTN) reveals a succession of early Burdigalian depositional environments. ......
Highlights ► Combination of foraminiferal assemblages, geochemical proxies, seismic images. ► Hall Formation reveals succession of early Burdigalian depositional environments. ► Documentation of final sedimentary infill of the Puchkirchen Trough. ► Three 3rd-order sequences that correspond to global sequences Bur 1-3. ► Eustatic sea-level rather than tectonics controls Burdigalian deposition. (ABSTRACT)


Grunert, P., Hinsch, R., Sachsenhofer, R., Bechtel, A., Ćorić, S., Harzhauser, M., Piller, W.E., Sperl, H., in press. Early Burdigalian infill of the Puchkirchen Trough (North Alpine Foreland Basin, Central Paratethys): facies development and sequence stratigraphy. Marine and Petroleum Geology, doi:10.1016/j.marpetgeo.2012.08.009


DISCOVERY OF ORDOVICIAN Bathysiphon - TEST STRUCTURE AND HABITAT OF A 'LIVING FOSSIL'

The giant, agglutinated foraminiferan Bathysiphon Sars, previously Triassic–Recent, occurs in much older sedimentary rock (Early Ordovician, late early Tremadocian) of Avalonia....... A felt-like, agglutinated test, a lumen packed with spherical structures (probable stercomata) and the domal ends of some specimens are consistent with modern Bathysiphon. This report is the first time that cytoplasmic activity and stercomata formation have been used to refer fossil protists to a modern group. Bathysiphon differs from the Cambrian foraminiferan Platysolenites Pander, which has an open lumen without stercomata, but support a comparable, sediment deposit-feeding niche. Bathysiphon is truly a ‘living fossil’, with a mode of test construction, cytoplasmic activity that formed stercomata and a niche unchanged for almost 500 million years. Foraminiferans have not been found prior to the Cambrian Period, and the Early Cambrian appearance of agglutinated foraminiferans is part of the radiation of Phanerozoic communities. (ABSTRACT)


Landing, E., Reyes, S.P., Andreas, A.L., Bowser,S.S., in press. First discovery of Early Palaeozoic Bathysiphon (Foraminifera) – test structure and habitat of a ‘living fossil’. Geological Magazine, doi:10.1017/S0016756812000155


BENTHIC FORAMINIFERA AS PROXIES OF POLLUTION: THE CASE OF GUANABARA BAY

Due to economic importance of Guanabara Bay, a multidisciplinary approach was adopted to investigate 88 surficial sediment samples in order to use the benthic foraminifera as indicators for the characterization of environmental variations. ......
Highlights ► We carried out geochemical and foraminiferal analyses on sediments of Guanabara Bay. ► Geochemical data show high concentration of heavy metals in the northern region. ► Foraminifera result affected differently by pollutants. ► The taxon Buliminella elegantissima correlates with anthropogenic pollutants. ► Data highlights the presence of sterile sediments not previously reported in the bay. (ABSTRACT)


Donnici, S., Serandrei-Barbero, R., Bonardi, M., Sperle, M., in press. Benthic foraminifera as proxies of pollution: The case of Guanabara Bay (Brazil). Marine Pollution Bulletin, doi:10.1016/j.marpolbul.2012.06.024.


RECENT PUBLICATIONS ON FORAMINIFERA | 2013 (1) | 2012 (6) | 2012 (5) | 2012 (4) | 2012 (3) | 2012 (2) | 2012 (1) | 2011 (5) | 2011 (4) | 2011 (3) | 2011 (2) | 2011 (1) | 2010