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SYSTEMATIC COLLECTIONS AT ICP OF ECOPETROL S.A.
...... In order to standardise the taxonomy and preserve all the generated knowledge, the Colombian Petroleum Institute (ICP) of ECOPETROL S.A built palynomorph and foraminiferal systematic collections comprising morphospecies from the Cretaceous to the Holocene. These collections are organised by taxa and by regional location, according to Colombian sedimentary basins. ...... the foraminiferal collection holds over 600 morphospecies of foraminifera among planktonic (35 %) and benthic forms (65%). ...... a cakephp user interface which allows to access the tool through the web. These databases contain descriptions and photomicrographs of the material deposited in them as well as of the original types. These collections are updated regularly by the curators, by means of constant revisions, discussions and improvements of preservation techniques. This material is currently not only in constant use by members of the Biostratigraphy Team at ICP and students but also by international experts, as in the case of the palynomorph collection. For these reasons, we consider our collections and their databases as effective tools to standardise the taxonomy and preserve the biostratigraphical knowledge of northern South America as well as a potential repository of new holotypes derived from future research in Colombia and adjacent areas.
Espitia, D., Vargas, M. C., Arenas, J. E., Jaramillo, C. A., Rueda, M. J., Duque-Caro, H., 2010. Palynomorphs and foraminifera from Colombia housed in the systematic collections of Ecopetrol-ICP. Revista Española de Micropaleontología 42 (3), 373-380.
FROM PLANKTONIC FORAMINIFERA TO AFRICAN CLIMATE DYNAMICS
The last 220 ka of the MD03-2705 (18 ° 05.81 'N - 21 ° 09.19' W) sedimentary sequence, retrieved off the Cape Verde islands, were investigated using a multiproxy approach. ......
This study documents the evolution of sea-surface conditions off Mauritania over the last two climatic cycles (220 ka). Sea-surface hydrological changes are discussed in the light of the regional paleoceanographic and paleoclimatic history, focussing on the links with the migration of the ITCZ, the upwelling dynamics and the evolution of the African monsoons.
Matsuzaki, K. M. R., Eynaud, F., Malaizé, B., Grousset, F. E., Tisserand, A., Rossignol, L., Charlier, K., Jullien, E., in press. Paleoceanography of the Mauritanian margin during the last two climatic cycles: from planktonic foraminifera to African climate dynamics. Marine Micropaleontology, doi:10.1016/j.marmicro.2011.01.004
DATING OF LIMESTONES IN BORNEO
On the basis of a combined larger benthic foraminifera, nannofossil and strontium isotope dating program we confidently re-assign muddy carbonate deposits from the Lower Kinabatangan River Area of Borneo to the Oligocene rather than the Early Miocene. High-diversity, coral-rich (> 50 species) deposits are here tightly constrained to predominately at, or just after, the Early to Late Oligocene boundary (Larger benthic foraminifera zone - Te1, Nannofossil zone - NP24, Sr isotope ages - 28.8 -27.6 Ma). This new dating potentially pushes back the start of the Indo-West Pacific Centre of Marine Diversity, at least for corals, about 5 million years earlier than previous data indicated. Our new data supports maintaining separation of the muddy carbonates (previously defined as the Lower Kinabatangan Limestones: Haile & Wong, 1965) from nearby crystalline limestones of the Gomantong Limestone Formation dated here as Early Miocene (Larger benthic foraminifera zone – Te5/earliest Tf1, Sr isotope age – 21.0 Ma). ...... The new data on the first shallow marine deposits in a long established deep marine location, and evidence for unconformities, has important implications for the regional tectonic model, in an area of hydrocarbon exploration.
McMonagle, L. B., Lunt, P., Wilson, M. E. J., Johnson, K. G., Manning, C., Young, J., in press. A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot . Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2011.02.009
PRODUCTIVITY ACROSS THE OLIGOCENE/MIOCENE BOUNDARY
The Oligocene to Miocene boundary (23 Ma) marks one of the major Cenozoic cooling steps. A corresponding but slightly lagging δ13C maximum in benthic foraminifer calcite of globally distributed sediment cores has been attributed to increased organic matter burial, either on land or in the oceans. To test this idea we reconstruct the organic carbon flux to the sea floor at three Atlantic Ocean Drilling Program (ODP) Sites using benthic foraminiferal accumulation rates (BFAR) and compare them with the stable isotope records. Our data show that the δ18O and δ13C maximum that characterizes the Oligocene/Miocene boundary is accompanied by a pronounced maximum in BFAR derived paleoproductivity at two of the sites. ...... These results imply that there was enhanced flux of organic matter to the ocean floor during the O/M climate transition and support that marine primary productivity may have played a role in the carbon cycle and atmospheric CO2 draw-down at this time.
Diester-Haass, L., Billups, K., Emeis, K., in press. Enhanced paleoproductivity across the Oligocene/Miocene boundary as evidenced by benthic foraminiferal accumulation rates. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2011.02.006
DETECTION OF FORAMINIFERA BY CATHODOLUMINESCENCE
Cathodoluminescence (CL) studies of Lower–Middle Oxfordian marls and limestones, as well as clasts from the uppermost Turonian–?Early Coniacian conglomerates of the Cracow Upland (southern Poland), reveal that the CL view of foraminifers from some lithologies differs from that in transmitted light. ...... These results indicate a strong influence of lithology and diagenesis and rather minor effects of shell structure on luminescence of microfossils. The CL technique can be a useful tool in the detection and documentation of abundance patterns of foraminifers that are poorly preserved under transmitted light.
Kołodziej, B., Jurkowska, A., Banaś. M,. Ivanova. D., in press. Improving detection of foraminifera by cathodoluminescence. Facies, DOI: 10.1007/s10347-010-0256-7
BIOGEOCHEMISTRY OF FORAMINIFERAL CALCITE IN COLD SEEPS
An extensive geochemical and biogeochemical examination of CH4 seeps in the Clam Flats area of Monterey Bay provides insight into the character of relationships between seep geochemistry and benthic foraminiferal geochemistry. ...... The geochemistry of the pore fluids should be relevant to the geochemistry of the carbonate tests of living and dead foraminifera. However, a profound disequilibrium of approximately an order of magnitude occurs between the 13C values of stained (cytoplasm-containing) foraminiferal carbonate and the C isotope values of ambient pore-water dissolved inorganic C. Reasons are unclear for this isotopic disequilibrium, but have important implications for interpretations of foraminiferal carbonate as a paleoenvironmental proxy. Much fine scale work is needed to fully understand the relationships between the biogeochemistry of benthic foraminifera and the geochemistry of the pore waters where they live.
Gieskes, J., Rathburn, A. E., Martin, J. B., Pérez, M. E., Mahn, C., Bernhard, J. M., Day, S., in press. Cold Seeps in Monterey Bay, California: Geochemistry of Pore Waters and Relationship to Benthic Foraminiferal Calcite. Applied Geochemistry, doi:10.1016/j.apgeochem.2011.01.032
HIDDEN COMPONENT OF DEEP-SEA FORAMINIFERA
...... we analysed the foraminiferal assemblage based on ribosomal DNA sequences amplified specifically from total DNA extracted from unsieved and fine fraction (< 32 μm) of sediment samples from three sites in Southern Ocean. We obtained 392 sequences, representing 123 phylotypes of foraminifera. Over 90% of phylotypes (112) could not be assigned to any previously sequenced species or genera. Among these new phylotypes, 20 belong to the clade of multi-chambered calcareous Rotaliida and agglutinated Textulariida, while 94 branch among the radiation of monothalamous species. Many new phylotypes clustered together with other environmental foraminiferal sequences and sequences of unknown origin. Eight new lineages of environmental foraminiferal sequences (ENFOR 1-8) were distinguished. The morphology of species included in these novel lineages is unknown, but we can speculate that they are tiny, amoeboid protists present in the deep-sea sediments. Their diversity may be as high as that of better known large-sized foraminifera. Documenting this hidden component of deep-sea foraminiferal assemblages is a major challenge for the future.
Pawlowski, J., Fontaine, D., da Silva, A. A., Guiard, J., in press. Novel Lineages of Southern Ocean deep-sea foraminifera revealed by environmental DNA sequencing. Deep-Sea Research Part II, doi:10.1016/j.dsr2.2011.01.009
GRAZING OF BENTHIC FORAMINIFERA ON BACTERIA
...... We have developed an approach that allows us to study grazing by adult specimens of the calcareous species Haynesina germanica and Ammonia beccarii, and the single-chambered agglutinated species Psammophaga sp., on bacteria (Halomonas sp.), pulse-chase-labelled with 3H- and 14C-Leucine. ...... The rate of release of 3H when protozoa were incubated with the labelled bacteria indicated the predator's grazing rate; the proportion of 14C found in the foraminiferal biomass and shell indicated the prey assimilation rate. All three foraminiferal species grazed bacteria at a rate of 3.2–5.7 ng C ind−1 h−1 depending on bacterial concentrations. About 23% of the biomass of the 14C-labelled prey was most likely assimilated into foraminiferal pseudopodia, 12% was expelled in dissolved waste material, about 62% was respired and only 0.1% was incorporated into the carbonate shell. Extracellular digestion associated with pseudopodia could explain the very low proportion of the labelled food assimilated in the cell body and the significant proportion located in pseudopodial networks. These experiments also suggest that very little of the carbon ingested by adult calcareous foraminifera is incorporated into the shell. However, we cannot conclude that diet has no influence on the stable isotope composition of the shell since none of our calcareous specimens grew new chambers during the experiments.
Mojtahid, M., Zubkov, M. V., Hartmann, M., Gooday, A. J., 2011. Grazing of intertidal benthic foraminifera on bacteria: Assessment using pulse-chase radiotracing. Journal of Experimental Marine Biology and Ecology 399 (1), 25-34.
CHUUK LAGOON ATOLL (CAROLINE ISLANDS, PACIFIC OCEAN)
The Chuuk Lagoon Atoll in the Caroline Islands system is located near the hotspot of tropical marine shallow-water diversity and adjacent to the global reef carbonate production center. It consists of a set of larger islands and smaller islets that are arranged in a triangular lagoonal atoll system surrounded by a protective reef barrier. This area constitutes an important biogeographic link between the Coral Triangle and other eastern Pacific Islands chains such as the Society, Marshall, Gilbert or Cook Islands. The Chuuk Islands also represent an area from which modern benthic foraminifera are virtually unknown. ...... Faunal comparisons of larger symbiont-bearing taxa with neighbouring biogeographic regions indicates that the foraminiferal assemblages from the Chuuk Island Lagoon represent a transitional biogeographic region between the high diverse Coral Triangle and East Pacific island chains. ...... diversity progressively drops off from the Coral Triangle towards the eastern Pacific.
Makled, W. A., Langer, M. R., 2011. Benthic Foraminifera from the Chuuk Lagoon Atoll System (Caroline Islands, Pacific Ocean). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 259 (2), 231-249.
PLANKTONIC FORAMINIFERA AS RECORDERS OF SEAWATER Ba/Ca
Recent studies have used the Ba/Ca ratio of planktic foraminifer shells as a proxy for river run-off at oceanic sites near estuaries. Such studies assume that the Ba/Ca ratio in planktic foraminifer shells is primarily controlled by the Ba/Ca concentration of seawater and that other parameters such as salinity, temperature and pH do not compromise the primary Ba concentration relationship. Here we provide new insights from culture experiments and review published studies to confirm that environmental parameters including pH, temperature, salinity, and symbiont photosynthesis do not affect Ba substitution into planktic foraminiferal calcite. The partition coefficient for Ba in spinose planktic foraminifers is estimated as DBa = 0.15 ± 0.05 (95% confidence limits). The same factor also seems applicable to the non-spinose genus Neogloboquadrina but not to specimens of the non-spinose genus Globorotalia.
Hönisch, B., Allen, K. A., Russell, A. D., Eggins, S. M., Bijma, J., Spero, H. J., Lea, D. W., Yu, J., in press. Planktic foraminifers as recorders of seawater Ba/Ca. Marine Micropaleontology, doi:10.1016/j.marmicro.2011.01.003
RELIABILITY AND GLOBAL CORRELATIONS OF Globostuncana ventricosa ZONE
The reliability of the first appearance datum of Globotruncana ventricosa as biozonal marker for the Campanian is discussed. The taxonomy and species concept of G. ventricosa and of Globotruncana tricarinata, that has been either regarded as junior synonym of Globotruncana linneiana or of G. ventricosa, are examined to avoid misidentifications, and one species is here formally described as new, Globotruncana neotricarinata nov. sp. ...... Besides the known diachronous first occurrence of G. ventricosa in the Southern Ocean sites, results confirm the difficulty in using G. ventricosa as zonal marker in the tropical and subtropical areas, and the validity of the first occurrence datum of C. plummerae for regional and global correlations.
Petrizzio, M. R., Falzoni, F., Premoli Silva, I., in press. Identification of the base of the lower-to-middle Campanian Globotruncana ventricosa Zone: Comments on reliability and global correlations). Cretaceous Research, doi:10.1016/j.cretres.2011.01.010
SHORT-TERM WARMING EVENTS DURING THE BOREAL ALBIAN
...... Here we present δ18O, δ13C, and Mg/Ca data for the middle to early-late Albian based on analysis of unusually well preserved “glassy” foraminifers from a clay-rich sequence drilled in the boreal Lower Saxony Basin (northwestern Germany; ~45°N paleolati- tude). Our records reveal pronounced variability in planktic δ18O (~1.5‰–2.5‰) on a 100 k.y. time scale that we interpret to indicate substantial changes in sea-surface temperature (to ~7 °C) and δ18O/salinity (to ~3 psu). Our findings attest to the climatic sensitivity of marginal basins in these boreal latitudes during the mid-Cretaceous and suggest that the heat and salt budgets of the Lower Saxony Basin were orbitally conditioned during the Albian, presumably through atmospheric or oceanic heat transport from lower latitudes where surface waters were warmer than today, in response to strong greenhouse gas forcing.
Erbacher, J., Friedrich, O., Wilson, P. A., Lehmann, J., Weiss, W., in press. Short-term warming events during the boreal Albian (mid-Cretaceous). Geology, doi: 10.1130/G31606.1
ALBIAN TO TURONIAN IN THE NORTHERN WESTERN INTERIOR SEAWAY
...... This study proposes a new zonation based on benthic foraminifera utilizing the reference section for the Albian to Turonian Arctic Red and Trevor formations located along the Hume River in the Peel Plateau region (Northwest Territories). A new absolute age date of 107.0 ± 1.9 Ma from a bentonite extends the biostratigraphic range of the Early Albian Quadrimorphina albertensis Zone into the Middle Albian. Integration of the new temporal framework with detailed sedimentological observations provides an interpretation of the dynamic depositional history for this northern region of the Western Interior Seaway (WIS). ...... In order to recognize the significant unconformity associated with the loss of Albian foraminifera and the angular unconformity observed in seismic profile, we propose the use of the Slater River Formation to describe the strata bound by the pisoidal ironstone and the first metre-plus sandstone bed marking the base of the interbedded mudstones and sandstones of the overlying Trevor Formation. The Hume River section is proposed as the type section for the Slater River Formation.
Thomson, D., Schröder-Adams, C. J., Hadlari, T., Dix, G., Davis, W. J., in press. Albian to Turonian stratigraphy and palaeoenvironmental history of the northern Western Interior Sea in the Peel Plateau Region, Northwest Territories, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology, doi: 10.1016/j.palaeo.2011.01.017
INTEGRATED STUDY OF MIDDLE TO UPPER ALBIAN IN FRANCE
An integrated study of the ammonites, inoceramid bivalves, planktonic foraminifera, calcareous nannofossils, geochemistry, stable carbon isotopes, and cyclostratigraphy is provided for the upper Middle to upper Upper Albian sucession exposed in the Col de Palluel section east of Rosans in Hautes-Alpes, France. ...... Time series analysis of the Al2O3 content of the 500 m Albian sequence present in the Col de Palluel and Risou sections reveals the presence of the 20 kyr precession, 40 kyr tilt, 100 kyr short eccentricity, and 406 kyr long eccentricity cycles. Correlation using planktonic foraminiferan and nannofossil data provide a link between the Col de Palluel and Risou sections and the Italian sequence at Gubbio, and in the Piobbico core. ...... It also provides a basis for the estimation of the length of the Albian Stage at 4.12 Ma, 0.8 Ma for the early Albian, 2.84 Ma for the Middle Albian, and 3.68 Ma for the late Albian substages.
Gale, A. S., Bown, P., Caron, M., Crampton, J., Crowhurst, S. J., Kennedy, W. J., Petrizzio, M. R., Wray, D. S. , 2011. The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research 32 (2), 59-130.
BORON ISOTOPES AND B/Ca IN BENTHIC FORAMINIFERA
...... We present 76 new Multi-Collector Inductively-Coupled Plasma Mass Spectrometry (MC-ICPMS) δ11B measurements on a range of benthic foraminifera from 23 late-Holocene samples from the Atlantic that reaffirm the utility of the δ11B-pH proxy. ...... Whilst in theory δ11B and B/Ca can be combined to provide a quantitative reconstruction of alkalinity and dissolved inorganic carbonate (DIC), in practice this is precluded by propagated uncertainties. δ11B data give significant constraints on foraminifera calcification mechanisms, and seem most simply explained by incorporation of B(OH)−4 into a HCO−3 pool, which is then completely incorporated in foraminiferal CaCO3. Our demonstration of the predictable variation of δ11B with pH, across a wide range of species and locations, provides confidence in the application of MC-ICPMS measurements of foraminiferal δ11B to reconstruct past changes in the ocean carbonate system.
Rae, J. B. J., Foster, G. L., Schmidt, D. N., Elliott, T., in press. Boron isotopes and B/Ca in benthic foraminifera: Proxies for the deep ocean carbonate system. Earth and Planetary Science Letters, doi:10.1016/j.epsl.2010.12.034
ECOPHYSIOLOGICAL MULTI-SPECIES MODEL
We present an eco-physiological model reproducing the growth of eight foraminifer species (Neogloboquadrina pachyderma, Neogloboquadrina incompta, Neogloboquadrina dutertrei, Globigerina bulloides, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinella siphonifera and Orbulina universa). By using the main physiological rates of foraminifers (nutrition, respiration, symbiotic photosynthesis), this model estimates their growth as a function of temperature, light availability, and food concentration. ...... The model also correctly reproduces the relative worldwide abundance and the diversity of the eight species when compared to core tops observations both using satellite and PISCES data. This model allows prediction of the season and water depth at which each species has its highest growth potential. This offers promising perspectives for both an improved quantification of paleoceanographic reconstructions and for a better understanding of the foraminiferal role in the marine carbon cycle.
Lambard, F., Labeyrie, L., Michel, E., Bopp, L., Cortijo, E., Retailleau, S., Howa, H., Jorissen, F., 2011. Simulating the growth and distribution of planktic foraminifer using an ecophysiological multi-species model. Biogeosciences Discuss 8, 1-49
Late Holocene cored sediments from the Aral Sea were examined in respect of foraminiferal diversity and the tests of 4 species of foraminifera were differentiated. ...... All of the identified species from the Aral Sea belong to the Ponto-Caspian faunal complex. Another Ponto-Caspian foraminiferal species is found in the mid-Holocene sediments of Kushmurun Lake located in the Turgai Valley in the southern part of the West Siberian Lowland. ...... The water flow, however, would have been directed to the south preventing foraminiferal migration to the north. Moreover, the freshwater conditions would not have allowed foraminifers to survive. Thus, foraminifera were transported to the West Siberian lakes from the Caspian Sea or from the Aral Sea by water birds. Avian-mediated colonization of lacustrine ecosystems by foraminifera is not an exception, but a regular process. The Aral Sea was re-colonized during the Holocene several times with the aid of water birds from the Caspian Sea.
Riedel, F., Kossler, A., Tarasov, P., Wünnemann, B., 2011. A study on Holocene foraminifera from the Aral Sea and West Siberian lakes and its implication for migration pathways . Quaternary International 229 (1-2), 105-111.
DEEP-SEA BENTHIC FORAMINIFERA IN HARDANGERFJORD
This is the first record of live (stained) deep-sea benthic foraminifera in the 850 m deep silled Hardangerfjord ...... Estimates of organic carbon flux (~2.5 g C m−2y−1) show that the fjord-values are comparable to similar depths on the continental slope. ...... the abiotic environment of the deep basins is stable even though the deepest basins are isolated from the open deep sea by the continental shelf and sills in the outer parts of the fjord suggesting that the deep-sea species are introduced as propagules during deep water renewals. ...... Indeed, the diversity is comparable both to that of the open deep sea and that of reported macrofauna from the same sites, reflecting similar ecological status. ...... Despite some evidence of transport, no major recent disturbance due to turbidite deposition seems to have occurred and hence Hardangerfjord presents a unique environment with elements of deep-sea faunae in a land-locked setting.
Alve, E., Murray, J. W., Skei, J., in press. Deep-sea benthic foraminifera, carbonate dissolution and species diversity in Hardangerfjord, Norway: an initial assessment. Estuarine, Coastal and Shelf Science, doi:10.1016/j.ecss.2010.12.018
MAGNETITE-BEARING FORAMINIFERA FROM WEST ANTARCTICA
...... we discovered two species of organic-walled, monothalamous foraminifera bearing mineral particles within their cytoplasm. The particles are predominantly magnetite and titanoferous magnetite. ...... One of the species, described here as Psammophaga magnetica sp. nov., has an elongate organic test and mineral particles located near the aperture. According to the analyses of ...... (SSU rDNA), the species may have a panantarctic distribution and is slightly different from a similar Arctic morphotype. The second species is morphologically and genetically similar to Allogromia crystallifera Dahlgren, 1962 from Scandinavian fjords. ...... In several specimens of this species, we found SSU rDNA sequences closely related, but not identical, to Hippocrepinella hirudinea (Heron-Allen and Earland, 1932), another monothalamous foraminifer present at the same sampling site. The origin of these extraneous sequences is unclear and raises the question of authenticity of rRNA gene sequences in some foraminifera.
Pawlowski, J., Majewski, W., 2011. MAGNETITE-BEARING FORAMINIFERA FROM ADMIRALTY BAY, WEST ANTARCTICA, WITH DESCRIPTION OF PSAMMOPHAGA MAGNETICA, SP. NOV.. Journal of Foraminiferal Research 41(1), 3-13.
PLANKTONIC TURNOVER ACROSS THE APTIAN/ALBIAN BOUNDARY INTERVAL
...... At Deep Sea Drilling Project (DSDP) Site 511 (southern South Atlantic), ...... the Aptian assemblage is of low diversity and species are replaced by initially one and then two very small, smooth-surfaced, thin-walled species of Microhedbergella n. gen. ...... The Albian record at Site 511 reveals a gradual increase in planktic foraminifera shell size and assemblage dominance, as well as the gradual evolution during the middle Albian of species characterized by a finely perforate, pustulose test. Taxa with this shell infrastructure are included in Muricohedbergella n. gen. A new ‘‘Ticinella yezoana’’ Partial Range Zone is erected at Site 511 for correlation of the middle-upper Albian at d Pseudoguembelitria blakenosensis n. gen., n. sp. are replaced by lower Albian assemblages composed only of two minute species of Microhedbergella. ...... A new upper lower Albian Ti. madecassiana Zone is defined at Site 1049 ...... The dramatic changes in planktic foraminiferal assemblag- es across the AABI suggest major changes in carbonate chemistry, vertical stratification, or productivity in the surface mixed layer occurred during the last 1 myr of the Aptian. ......
Huber, B. T., Leckie, R. M., 2011. PLANKTIC FORAMINIFERAL SPECIES TURNOVER ACROSS DEEP-SEA APTIAN/ ALBIAN BOUNDARY SECTIONS. Journal of Foraminiferal Research 41(1), 53-95.
POPULATION RESPONSE TO FLUCTUATING INFLOW
Freshwater input into Texas estuaries is critical to maintaining habitat, and foraminiferal populations can provide a means for assessing the effects of natural inflow as well as mandated releases. ...... Statistical analysis of all three discharge periods shows that population density varies with flow regime. At low and low/moderate discharge there are pronounced density differences among the stations, with higher densities near river input. At high discharge, population density is high at each station. This study establishes the receptivity of foraminifera to relatively short-term changes in freshwater inflow, and highlights their value for monitoring the effects of inflow on biota in Texas estuaries. The unique geographic distribution of each species may be a characteristic that imparts species resilience through time.
Buzas-Stephens, P., Buzas, M. A., Elliot, B. A., 2011. FORAMINIFERAL POPULATION RESPONSE TO FLUCTUATING INFLOW INTO NUECES BAY, TEXAS. Journal of Foraminiferal Research 41(1), 14-21.
MARINE SHELF TO PARALIC BIOFACIES IN SPITSBERGEN
The Late Triassic to Early Jurassic Kapp Toscana Group of Spitsbergen consists of mudstones, sandstones and shales deposited in offshore marine to paralic conditions in an extensive shelf embayment. The study focuses on microfossil-based biofacies features (mainly foraminifera, but also palynomorphs) combined with sedimentary and selected geochemical data, in relation to transgressive-regressive developments. The analysed material includes field logs and sediment samples originating from the Juvdalskampen section, central Spitsbergen. The benthic foraminiferal succession reveals three principal associations ...... The potential of the boron concentration as a salinity indicator is demonstrated by its co-variance with biofacies features: the boron content increases with increasing salinity. ......
Nagy, J., Hess, S., Dypvik, H., Bjærke, T., in press. Marine shelf to paralic biofacies of Upper Triassic to Lower Jurassic deposits in Spitsbergen. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2010.12.018
OXYGEN RESPIRATION RATES OF BENTHIC FORAMINIFERA
...... Oxygen respiration rates of seventeen species of benthic foraminifera were measured using microelectrodes and calculated on the basis of the oxygen fluxes measured in the vicinity of the foraminiferal specimens. The results show a wide range of oxygen respiration rates for the different species (from 0.09 to 5.27 nl cell−1 h−1) and a clear correlation with foraminiferal biovolume showed by the power law relationship. ...... The total contribution of benthic foraminifera to the aerobic mineralisation of organic matter is estimated for the studied areas. The results suggest that benthic foraminifera play only a minor role (0.5 to 2.5%) in continental shelf environments, which strongly contrasts with their strong contribution to anaerobic organic matter mineralisation, by denitrification, in the same areas.
Geslin, E., Risgaard-Petersen, N., Lombard, F., Metzger, E., Langlet, D., Jorissen, F., 2011. Oxygen respiration rates of benthic foraminifera as measured with oxygen microsensors. Journal of Experimental Marine Biology and Ecology 396 (2), 108-114.
high latitudes. ...... Aptian species of Hedbergella, Globigerinelloides, an
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