Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA 2012 (3)"

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'''[[RECENT PUBLICATIONS ON FORAMINIFERA|RECENT PUBLICATIONS ON FORAMINIFERA]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2012 (2)|2012 (2)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2012 (1)|2012 (1)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (5)|2011 (5)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (4)|2011 (4)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (3)|2011 (3)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (2)|2011 (2)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (1)|2011 (1)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2010|2010]]'''<font size="2">
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{{Recent Publications on Foraminifera Navigation}}<font size="2">
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==THE ECOLOGY AND BIOGEOGRAPHY OF ''Discospirina tenuissima'' IN THE ATLANTIC AND INDIAN OCEANS==
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[[Image:Deep-Sea_Research_II_front.gif‎|left|80px|]]<font size="2">
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The large (≥1 cm diameter) miliolid foraminifera ''Discospirina tenuissima'' (Carpenter and Jeffries, 1870) is common at four sites (NW, NE, SW, SE), located on either side of the Mid-Atlantic Ridge to the north (54°N) and south (49°N) of the Charlie-Gibbs Fracture Zone. The white discoidal tests of this epifaunal species were visible in video surveys of flat and gently (10°) sloping, sediment-covered areas of seafloor (replicate 500-m-long transects, 1000 m<sup>2</sup> surface area) obtained using the Remote Operated Vehicle ''Isis''. Considerable variation was also evident between individual transects (0–2.25 ind m−2). The tests displayed no consistent dispersion pattern; both significantly random and clumped patterns were observed, in some cases within a single site. ...... They were particularly common at the SE site, where one or two abandoned rings indicated that some tests had moved distances of several centimetres across the seafloor. Most previous records of ''D. tenuissima'' are from well-oxygenated sites in the NE Atlantic. We provide the first records from the Indian Ocean. Here, this species occurs at bathyal depths in the northwest (1980 m) and northeast (938 m) Arabian Sea, where bottom-water oxygen concentrations are depressed.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0967064512000781 ABSTRACT])
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----Gooday, A.J., Alt, C.H.S., Jones, D.O.B., Shale, D., Marsden, K., Brasier, M.D., in press. [http://www.sciencedirect.com/science/article/pii/S0967064512000781 The Ecology and Biogeography of ''Discospirina tenuissima'' (Foraminifera) in the Atlantic and Indian Oceans]. Deep Sea Research II, doi:10.1016/j.dsr2.2012.05.001
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==EARLY STALL OF WEST ANTARCTIC ICE SHEET ADVANCE ON THE EASTERN ROSS SEA MIDDLE SHELF==
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[[Image:PPP_front.gif‎|left|80px|]]<font size="2">
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Marine geological and geophysical data suggest that the West Antarctic Ice Sheet (WAIS) deposited three thick seismically-resolvable units in the eastern Ross Sea since the Last Glacial Maximum (LGM) but the chronology of these grounding events is debated. Existing ice-retreat chronologies for the eastern Ross Sea are considered suspect because nearly all have been developed using radiocarbon dating of acid-insoluble organics (AIO) from bulk sediment. We used a new strategy to isolate in situ forams from diamict sediment deposited at the middle-shelf grounding-zone wedge (GZW) — a subaqueous ice-marginal landform previously interpreted to represent deposition during the third grounding event since the LGM advance to the shelf edge. Here we present a synthesis of our new radiocarbon dates of foram tests and AIO with previously published radiocarbon dates. ......
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018211004330 ABSTRACT])
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----Bart, P.J., Cone, A.N., 2012. [http://www.sciencedirect.com/science/article/pii/S0031018211004330 Early stall of West Antarctic Ice Sheet advance on the eastern Ross Sea middle shelf followed by retreat at 27,500 <sup>14</sup>C yr BP]. Palaeogeography, Palaeoclimatology, Palaeoecology 335-336, 52-60.
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==MAGNITUDE AND TIMING OF EQUATORIAL ATLANTIC SURFACE WARMING DURING THE LAST GLACIAL BIPOLAR OSCILLATIONS==
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[[Image:Climate_of_the_Past_front.jpg‎|left|80px|]]<font size="2">
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We present core top and down core sample analyses of Mg/Ca in tests of planktonic foraminifer ''Globigerinoides ruber'' (variety pink) from the eastern Tropical-Equatorial Atlantic. Multivariate analysis of the core top data shows that Mg/Ca varies by 8 ± 2% and 1 ± 0.9% per unit sea surface temperature (SST) (°C) and salinity (psu) changes, respectively, indicating that temperature exerts the most dominant control on planktonic foraminiferal Mg/Ca variation. A centennially resolved record of Mg/Ca-based SST estimates from the Eastern Equatorial Atlantic (EEA) exhibits a close correlation between episodes of equatorial surface water warming, the onset of massive melt-water inputs into the North Atlantic (Heinrich events H3–H6), and rapid drop of air temperature over Greenland, indicating that the Eastern Equatorial Atlantic responded very sensitively to millennial-scale bipolar oscillations of the last glacial and marine isotope stage 3. ...... Our study emphasizes that changes in wind fields and wind-induced low latitude zonal surface currents were crucial in shaping the spatial heterogeneity and duration of Equatorial Atlantic surface water warmth.
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<font size="2">([http://www.clim-past-discuss.net/8/1737/2012/ ABSTRACT])
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----Weldeab, S., 2012. [http://www.clim-past-discuss.net/8/1737/2012/ Magnitude and timing of Equatorial Atlantic surface warming during the last glacial bipolar oscillations]. Climate of the Past Discussion 8, 1737-1762.
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==SST FOR LEFT-COILING ''Neogloboquadrina'' POPULATIONS IN THE WESTERN MOST MEDITERRANEAN IN PLEISTOCENE-PLIOCENE==
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[[Image:Geobios_cover.gif‎|left|80px|]]<font size="2">
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Using the modern analog methodology applied to planktonic foraminifers, we analyze the relation between the frequency of the coiling type in ''Neogloboquadrina'' populations and the sea-surface temperatures (SST) during the middle Pleistocene and the Pleistocene-Pliocene transition in the Alboran Sea (westernmost Mediterranean), close to the Atlantic connection. The results reveal that the present-day positive correlation between the two variables (r = 0.649) is maintained even with a higher coefficient (r = 0.783) in the middle Pleistocene but falls slightly (r = 0.517) in the Pleistocene-Pliocene transition due mainly to a dispersal of the temperatures for the samples bearing predominantly left-coiling ''Neogloboquadrina''. The temperature used as a reference for the coiling change resulted 5-6 °C above its North Atlantic present-day reciprocal, but these thermal differences could be caused by ...... these results in combination with those derived from the isotopic analyses (δ<sup>18</sup>O) in ''G. bulloides'' tests, suggest that during the Pliocene-Pleistocene transition two different populations of left-coiling ''Neogloboquadrina'' could have existed with different environmental requirements: one, derived from late Miocene-Pliocene (i.e., left-coiling ''N. acostaensis'' group), and another being the ancestor of the modern ''N. pachyderma'' (left-coiling). ......
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0016699512000162 ABSTRACT])
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----Serrano, F., Guerra-Merchán, A., in press. [http://www.sciencedirect.com/science/article/pii/S0016699512000162 Sea-surface temperature for left-coiling ''Neogloboquadrina populations'' inhabiting the westernmost Mediterranean in the middle Pleistocene and the Pleistocene-Pliocene transition]. Geobios, doi:10.1016/j.geobios.2011.04.003
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==LATE MIOCENE PALAEOGEOGRAPHIC EVOLUTION OF THE ATLANTIC - MEDITERRANEAN SEAWAY==
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[[Image:Geobios_cover.gif‎|left|80px|]]<font size="2">
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The marine stratigraphic record of the Granada Basin (central Betic Cordillera, Spain) is composed of three Late Miocene genetic units deposited in different sea-level contexts (from base to top): Unit I (sea-level rise), Unit II (high sea-level), and Unit III (low sea-level). The latter mainly consists of evaporites precipitated in a shallow-basin setting. Biostratigraphic analyses based on planktonic foraminifera and calcareous nannoplankton indicate four late Tortonian bioevents (PF1-CN1, PF2, PF3, and PF4), which can be correlated with astronomically-dated events in other sections of the Mediterranean. ...... Comparisons with data from the other Betic basins indicate that the evaporitic phase of the Granada Basin (7.37-7.24 Ma) is not synchronous with those from the Lorca Basin (7.80 Ma) and the Fortuna Basin (7.6 Ma). In the Bajo Segura Basin (easternmost Betic Cordillera), no evaporite deposition occurred during the late Tortonian. The evaporitic unit of the Granada Basin (central Betics) records the late Tortonian restriction of the Betic seaway (the marine connection between the Atlantic and Mediterranean). The diachrony in the restriction of the Betic seaway is related to differing tectonic movements in the central and eastern sectors of the Betic Cordillera.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0016699512000332 ABSTRACT])
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----Corbí, H., Lancis, C., Harcía-García, F., Pina, J.-A., Soria, J.M, Tent-Manclús, J.E., Viseras, C., in press. [http://www.sciencedirect.com/science/article/pii/S0016699512000332 Updating the marine biostratigraphy of the Granada Basin (central Betic Cordillera). Insight for the Late Miocene palaeogeographic evolution of the Atlantic - Mediterranean seaway]. Geobios, doi:10.1016/j.geobios.2011.10.006
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==''Praeorbitolina''/''Palorbitolinoides'' ASSOCIATION: AN APTIAN BIOSTRATIGRAPHIC KEY-INTERVAL IN THE NEO-TETHYS==
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[[Image:CretaceousResearch_front.gif|left|80px|]]<font size="2">
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The ''Praeorbitolina''/''Palorbitolinoides'' Association characterizes a Lower Cretaceous biostratigraphic interval, which is marked by the common occurrence of these two foraminiferal genera. The base of this interval is defined by the inception of ''Palorbitolinoides'' cf. ''orbiculata'', whereas the top is marked by the disappearance of the genus ''Praeorbitolina''. The ''Praeorbitolina''/''Palorbitolinoides'' Association is evident in the uppermost part of the Lower Aptian of the Apulian and Adriatic Carbonate Platforms, as well as of the eastern Arabian Plate, all located at the southern margin of the Neo-Tethys.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0195667112000420 ABSTRACT])
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----Cherchi, A., Schroeder, R., in press. [http://www.sciencedirect.com/science/article/pii/S0195667112000420 The ''Praeorbitolina''/''Palorbitolinoides'' Association: an Aptian biostratigraphic key-interval at the southern margin of the Neo-Tethys]. Cretceous Research, doi:10.1016/j.cretres.2012.02.018
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==THE EVOLUTIONARY ORIGIN OF THE GENUS ''Hantkenina''==
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[[Image:RevueDeMicropaleontologie_front.gif‎‎‎‎‎|left|80px|]]<font size="2">
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A high-resolution study of the Tethyan Contessa Highway reference section (Gubbio, Italy) has produced a detailed, well-constrained and more complete pattern of the gradual evolutionary origin of the foraminiferal genus ''Hantkenina'' from ''Clavigerinella'' than hitherto shown. A nine-stage pattern is presented for this evolutionary lineage. The related time frame and duration are assessed using the astronomical calibration of the Contessa Highway record. The evolution of ''Clavigerinella caucasica'' to ''Hantkenina gohrbandti'', the real ancestor of ''Hantkenina'', leads in 333 kyr. The ''H. gohrbandti'' first appearance is dated at 45.564 Ma. Our findings show that during the middle Eocene, from 46 to 45.5 Ma and with a major pulse centered at 45.521 Ma deep-mesopelagic planktonic foraminifera may have developed different morphological modifications to tolerate temporary exceptionally stressful environmental conditions. These conditions are principally related to poorly oxygenated and usually food-poor waters. This suggests that sustained and expanded oxygen minimum zone conditions and associated enhanced eutrophication might have occurred during that time.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0035159812000153 ABSTRACT])
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----Coccioni, R., Bancalà, G., in press. [http://www.sciencedirect.com/science/article/pii/S0035159812000153 New insights into the pattern, timing, and duration of the evolutionary origin of the foraminiferal genus Hantkenina]. Revue de Micropaléontologie, doi:10.1016/j.revmic.2012.03.002
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==PETM IN SHALLOW-MARINE SUCCESSIONS OF THE ADRIATIC CARBONATE PLATFORM==
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[[Image:GAS_Bulletin.jpg‎‎‎‎|left|80px|]]<font size="2">
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The Paleocene-Eocene thermal maximum represents one of the most rapid and extreme warming events in the Cenozoic. Shallow-water stratigraphic sections from the Adriatic carbonate platform offer a rare opportunity to learn about the nature of Paleocene-Eocene thermal maximum and the effects on shallow-water ecosystems. We use carbon and oxygen isotope stratigraphy, in conjunction with detailed larger benthic foraminiferal biostratigraphy, to establish a high-resolution paleoclimatic record for the Paleocene-Eocene thermal maximum. A prominent negative excursion in δ<sup>13</sup>C curves of bulk-rock (∼1‰–3‰), matrix (∼4‰), and foraminifera (∼6‰) is interpreted as the carbon isotope excursion during the Paleocene-Eocene thermal maximum. The strongly <sup>13</sup>C-depleted δ<sup>13</sup>C record of our shallow-marine carbonates compared to open-marine records could result from organic matter oxidation, suggesting intensified weathering, runoff, and organic matter flux.
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<font size="2">([http://gsabulletin.gsapubs.org/content/early/2012/05/02/B30553.1.abstract ABSTRACT])
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----Zamagni, J., Mutti, M., Ballato, P., Košir, A., in press. [http://gsabulletin.gsapubs.org/content/early/2012/05/02/B30553.1.abstract The Paleocene–Eocene thermal maximum (PETM) in shallow-marine successions of the Adriatic carbonate platform (SW Slovenia)]. The Geological Society of America Bulletin, doi:10.1130/B30553.1
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==COASTAL SEDIMENTATION ASSOCIATED WITH THE TOHOKU TSUNAMI IN SOUTH KURIL ISLANDS, NW PACIFIC==
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<font size="2">
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Sediment deposited by the Tohoku tsunami of March 11, 2011 in the Southern Kurils (Kunashir, Shikotan, Zeleniy, Yuri, Tanfiliev islands) was radically different from sedimentation during local strong storms and from tsunamis with larger runup at the same location. Sediments from the 2011 Tohoku tsunami were surveyed in the field, immediately and 6 months after the event, and analyzed in the laboratory for sediment granulometry, benthos Foraminifa assemblages, and diatom algae. ...... The Foraminifera assemblages displayed features characteristic of benthic microfauna in the near-shore zone. Deep-sea diatoms recovered from tsunami deposits in two closely situated bays, namely Krabovaya and Otradnaya bays, had different requirements for environmental temperature, suggesting these different diatoms were brought to the bays by the tsunami wave entraining various water masses when skirting the island from the north and from the south.
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<font size="2">([http://www.springerlink.com/content/0q7j471768hp25r1/ ABSTRACT])
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----Rzzjigaeva, N.G., Ganzey, L.A., Grebennikova, T.A., Ivanova, E.D., Kharlamov, A.A., Kaistrenko, V.M., Shishkin, A.A., 2012. [http://www.springerlink.com/content/0q7j471768hp25r1/ Coastal Sedimentation Associated with the Tohoku Tsunami of 11 March 2011 in South Kuril Islands, NW Pacific Ocean]. Pure and Applied Geophysics, doi: 10.1007/s00024-012-0478-4
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==THE 1ST <sup>14</sup>C ANALYSES FROM THE CENTRAL BALTIC SEA AND A PSV & Pb AGE MODEL ==
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[[Image:QuaternaryScienceReviews_front.gif‎|left|80px| ]]<font size="2">
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Dating of sediment cores from the Baltic Sea has proven to be difficult due to uncertainties surrounding the <sup>14</sup>C reservoir age and a scarcity of macrofossils suitable for dating. Here we present the results of multiple dating methods carried out on cores in the Gotland Deep area of the Baltic Sea. Particular emphasis is placed on the Littorina stage (8 ka ago to the present) of the Baltic Sea and possible changes in the <sup>14</sup>C reservoir age of our dated samples. Three geochronological methods are used. Firstly, palaeomagnetic secular variations (PSV) are reconstructed, whereby ages are transferred to PSV features through comparison with varved lake sediment based PSV records. Secondly, lead (Pb) content and stable isotope analysis are used to identify past peaks in anthropogenic atmospheric Pb pollution. Lastly, <sup>14</sup>C determinations were carried out on benthic foraminifera (''Elphidium'' spec.) samples from the brackish Littorina stage of the Baltic Sea. ...... <br/>
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'''Highlights'''
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► An independent Baltic Sea palaeomagnetic and Pb deposition age model is constructed. ► The palaeomagnetic method is assessed for various Baltic Sea sediment types. ► The first <sup>14</sup>C analyses based on foraminifera for the central Baltic Sea are presented. ► An experimental gas ion source <sup>14</sup>C analysis technique is used on low mass samples. ► <sup>14</sup>C results are compared to the independent age model to infer reservoir age.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0277379112001321 ABSTRACT])
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----Lougheed, B.C., Snowball, I., Moros, M., Kabel, K., Muscheler, R., Virtasalo, J.J., Wacker, L., 2012. [http://www.sciencedirect.com/science/article/pii/S0277379112001321 Using an independent geochronology based on palaeomagnetic secular variation (PSV) and atmospheric Pb deposition to date Baltic Sea sediments and infer <sup>14</sup>C reservoir age]. Quaternary Science Reviews 42 , 43-58.
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==Sr ISOTOPE FRACTION OF PLANKTIC FORAMINIFERA AND INORGANIC CALCITE==
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<font size="2">
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We have investigated the strontium isotope fractionation (Δ<sup>88/86</sup>Sr<sub>carb-aq</sub>) between inorganic calcite and aqueous Sr<sup>2+</sup> ions by precipitation experiments at a constant temperature of 25°C and precipitation rates (R) ranging from 10<sup>2.3</sup> to 10<sup>4.2</sup> μmol/m<sup>2</sup>/h. Strontium isotope ratios were measured using the <sup>87</sup>Sr-<sup>84</sup>Sr double spike technique. It was found that strontium isotope fractionation in these calcites is strongly dependent on the precipitation rate: ...... The strontium isotopes of both foraminifera species are strongly fractionated (Δ<sup>88/86</sup>Sr<sub>carb-aq</sub> = -0.248 ± 0.005‰) when compared to published data of other major marine calcifiers. Applying the results from the inorganic precipitation experiments we find that the strong foraminiferal strontium isotope fractionation can be explained by calcification in a largely open system at high precipitation rates, comparable in magnitude to rates known from scleractinian reef corals. This interpretation is in good agreement with the kinetic calcification model for planktic foraminifera by Kisakürek et al. (''GCA'' '''75''' (2011), 427), which was based on calcium isotopes and elemental Sr/Ca ratios.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0016703712002438?v=s5 ABSTRACT])
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----Böhm, F., Eisenhauer, A., Tang, J., Dietzel, M., Krabbenhöft, A., Kisakürek, B., Horn, C., in press. [http://www.sciencedirect.com/science/article/pii/S0016703712002438?v=s5 Strontium isotope fractionation of planktic foraminifera and inorganic calcite].Geochimica et Cosmochimica Acta, doi:10.1016/j.gca.2012.04.038
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==PREFERENCE FOR SPECIFIC SEDIMENT FRACTIONS AND POLLUTION TOLERANCE OF BENTHIC FORAMINIFERA==
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[[Image:Marine_Geology_Cover.gif‎‎‎‎|left|80px| ]]<font size="2">
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The coastal zone is the most variable area in the marine system in terms of environmental parameters and it is characterized by the highest granulometric variability. Considering that the distribution of benthic foraminifera is controlled by several biotic and abiotic factors, including sediment texture, this may be considered one of the main factors influencing foraminiferal assemblage composition. The role of sediment grain size on foraminiferal species distribution has been recognised by several studies, but only in a few cases it has been considered from a quantitative viewpoint. On this rationale, 137 sediment samples collected in three different Italian National Relevance Sites (Bagnoli, Baia and Augusta), affected by different type and degree of pollution, were analysed for grain size and benthic foraminifera. ...... <br/>
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'''Highlights'''
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► We studied the preference of foraminiferal species for selected sediment fractions. ► A general preference of some species for specific sediment fractions was recognized. ► Sediment controls species distribution both in moderately and heavily polluted sites. ► Groups of species with different trophic needs showed preference for sand or mud. ► Species selecting fine sediment may be pollution tolerant due to adaptive strategy.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0025322712000837?v=s5 ABSTRACT])
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----Magno, M.C., Bergamin, L., Finoia, M.G., Pierfranceschi, G., Venti, F., Romano, E., in press. [http://www.sciencedirect.com/science/article/pii/S0025322712000837?v=s5 Correlation between textural characteristics of marine sediments and benthic foraminifera in highly anthropogenically-altered coastal areas]. Marine Geology, doi: 10.1016/j.margeo.2012.04.002
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==PALAEOENVIRONMETAL EVOLUTION OF THE EAST CARPATHIAN FOREDEEP DURING THE LATE MIOCENE-EARLY PLIOCENE==
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<font size="2">
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The thick and continuous Mio-Pliocene sedimentary successions of the Focşani Depression in the Dacian Basin of Romania provide an excellent opportunity to study the palaeoecological changes in the Eastern Paratethys during the time when the Mediterranean and Black Sea experienced major sea level fluctuations related to the closure and re-opening of the marine connection to the Atlantic Ocean during the Messinian Salinity Crisis. These successions form the basis of high-resolution magneto-biostratigraphic studies that allow a detailed correlation to the standard Geological Time Scale. Here, we analyse the palaeoenvironmental evolution of the East Carpathian foredeep by integrating micro- and macropalaeontological data and sedimentological analyses. ......
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0921818112000604?v=s5 ABSTRACT])
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----Stoica, M., Lazar, I., Krijgsman, W., Vasiliev, I., Jipa, D., Floroiu, A., in press. [http://www.sciencedirect.com/science/article/pii/S0921818112000604?v=s5 Palaeoenvironmental evolution of the East Carpathian foredeep during the late Miocene – early Pliocene (Dacian Basin; Romania)]. Global and Planetary Change, doi:10.1016/j.gloplacha.2012.04.004
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==LATE QUATERNARY BIOSTRATIGRAPHY AND PALEOENVIRONMENTS IN THE BRAZILIAN BASIN==
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<font size="2">
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The foraminiferal (planktonic and benthic) and nannofosssil assemblages have been analyzed in the sediments of Core ACB-17-1447 taken from the South America continental slope north of the Rio Grande Rise piedmont during Cruise 17 of the R/V Akademik Sergey Vavilov. ...... The Quaternary age of the host sediments is evident from the occurrence of the planktonic foraminiferal index species ''Globorotalia truncatulinoides''. Based on the nannofossil assemblages, the core sediments are attributed to the upper Pleistocene-Holocene. ...... The paleotemperature analysis of the planktonic foraminifers provided data for constructing the temperature curve that demonstrates two warm peaks. ...... Based on the abundances, taxonomic diversity, and proportions of the characteristic species of benthic foraminifers, the Core ASV-17-1447 section is divided into six intervals correlated with the marine isotopic stages defined by both the planktonic foraminifers and climatic changes evident from the variations in the bottom water circulation along the southwestern slope of the Brazilian Basin during the Late Quaternary.
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<font size="2">([http://www.springerlink.com/content/w247443204816204/ ABSTRACT])
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----Dmitrenko, O.B., Lukashina, N.P., Os'kina, N.S., 2012. [http://www.springerlink.com/content/w247443204816204/ Upper quaternary biostratigraphy and formation environments of the southwestern Atlantic Core ACB-17-1447 inferred from micropaleontological data]. Oceanology 52 (2), 249-260.
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== INDIVIDUAL TO COMMUNITY-LEVEL FAUNAL RESPONSES TO EARLY MIOCENE GLOBAL WARMING ==
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[[Image:PLoS_ONE.jpg‎‎|left|80px| ]]<font size="2">
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Modern climate change has a strong potential to shift earth systems and biological communities into novel states that have no present-day analog, leaving ecologists with no observational basis to predict the likely biotic effects. Fossil records contain long time-series of past environmental changes outside the range of modern observation, which are vital for predicting future ecological responses, and are capable of (a) providing detailed information on rates of ecological change, (b) illuminating the environmental drivers of those changes, and (c) recording the effects of environmental change on individual physiological rates. Outcrops of Early Miocene Newport Member of the Astoria Formation (Oregon) provide one such time series. This record of benthic foraminiferal and molluscan community change from continental shelf depths spans a past interval environmental change (~20.3-16.7 mya) during which the region warmed 2.1–4.5°C, surface productivity and benthic organic carbon flux increased, and benthic oxygenation decreased, perhaps driven by intensified upwelling as on the modern Oregon coast. ......
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<font size="2">([http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0036290 ABSTRACT])
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----Belanger, C.L. S., 2012. [http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0036290 Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming]. PLoS ONE 7 (4): e36290. doi:10.1371/journal.pone.0036290
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== ISOTOPIC COMPOSITION OF LANGHIAN FORAMINIFERAL TESTS IN A MARGINAL PART OF THE CARPATHIAN FOREDEEP ==
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[[Image:GeologicaCarpathica_front.jpg‎‎‎|left|80px| ]]<font size="2">
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Foraminiferal assemblages from three locations of the Moravian part of the Carpathian Foredeep (Kralice, Premyslovice, Zidlochovice) have been studied in order to determine the paleoenvironmental conditions during the Early Badenian (Middle Miocene). Paleobiological characteristics (plankton/benthos-ratio, relative abundances of warm-water plankton species, five-chambered ''Globoturborotalita'' spp., ''Coccolithus pelagicus'' and high nutrient markers [benthos], test sizes and ranges of ''Globigerina'' sp. and cibicidoids, Benthic Foraminiferal Oxygen Index) were determined along with stable C and O isotope compositions. ...... Several types of near-shore paleoenvironment were distinguished using the theoretical models: (i) bay influenced by seasonal phytodetritus supply from the continent (Kralice); (ii) dynamic shore characterized by variable isotopic compositions probably due to mixing of indigenous, transported and reworked tests (Premyslovice); (iii) shore of alternating normal marine and continentally influenced environments (Zidlochovice).
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<font size="2">([http://www.geologicacarpathica.sk/src/main.php ABSTRACT])
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----Holcova, K., Demeny, A., 2012. [http://www.geologicacarpathica.sk/src/main.php The oxygen and carbon isotopic composition of Langhian foraminiferal tests as a paleoecological proxy in a marginal part of the Carpathian Foredeep (Czech Republic)]. Geologica Carpathica 63 (2), 121-137.
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==A REAPPRAISAL OF THE VITAL EFFECT IN BENTHIC FORAMINIFERA ON Mg/Ca RATIOS==
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[[Image:Biogeosciences_front.jpg‎‎|left|80px| ]]<font size="2">
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...... The diversity in foraminiferal Mg/Ca-temperature calibrations suggests that there is also a biological control on this proxy. This study presents a new Mg/Ca-temperature calibration for the benthic foraminifer ''Bulimina marginata'', based on cultures under a range of temperatures (4–14 ° C). ...... The inter-individual variability is quantified and split in three components, namely (1) an analytical error; (2) an environmental effect and (3) a vital effect. The effect of inter-individual variability on the accuracy of Mg/Ca-temperature calibrations is depending on the sensitivity of the used calibration and the number of individuals measured (Temperature uncertainty = (0.33 · N<sup>−0.50</sup>)/sensitivity). The less sensitive a calibration, the greater is the impact of inter-individual variability. This can partly be circumvented by measuring more individuals. Differences in sensitivity may depend on the stability of the environment in which the foraminifera live and the concurring ecological strategy. This study shows the link between inter-individual variability en sensitivity and their influence on the accuracy of \Mg/Ca-temperature calibrations.
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<font size="2">([http://www.biogeosciences-discuss.net/9/4947/2012/ ABSTRACT])
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----Wit, J.C., de Nooijer, L.J., Barras, C., Jorissen, F., Reichart, G.J., 2012. [http://www.biogeosciences-discuss.net/9/4947/2012/ A reappraisal of the vital effect in benthic foraminifera on Mg/Ca ratios: species specific uncertainty relationships]. Biogeosciences Discuss 9, 4947-4977.
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==ORIGIN OF DEEP WATER IN THE JAPAN SEA OVER THE LAST 145kyr==
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[[Image:PPP_front.gif‎‎|left|80px| ]]<font size="2">
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We examined the paleoceanographic origin of the deep water in the Japan Sea over the last 145 kyr by using stable isotope data from foraminifera and paleontological data related to diatoms and planktonic foraminiferal coiling direction from core KT05-9p2 recovered from the Yamato Rise in the center of the Japan Sea. ......<br/>
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'''Highlights'''
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► We examined the paleoceanographic origin of the Japan Sea for the last 145 ka. ► The Tsushima and Oyashio currents have been the major source of water in the Japan Sea. ► The glacio-eustatsy has greatly influenced the oceanic regime of the Japan Sea. ► Seasonal cooling of surface water produced deep water at high sea-level stands. Baroclinic forcing induced the inflow of the Oyashio Current at low sea-level stands.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018212002064 ABSTRACT])
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----Minoura, K., Akai, K., Nemoto, N., Tsukawaki, S., Nakamura, T., in press. [http://www.sciencedirect.com/science/article/pii/S0031018212002064 Origin of deep water in the Japan Sea over the last 145kyr]. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.04.011
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==THE BEDOULIAN (LOWER APTIAN) STRATOTYPE AT ROQUEFORT-LA BÉDOULE, SE FRANCE==
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[[Image:CretaceousResearch_front.gif|left|80px| ]]<font size="2">
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New drill cores from the Lower Aptian historical stratotype at Roquefort-La Bédoule (SE France) provide continuous high-resolution geochemical and isotope records which closely track the onset of OAE 1a in a subtropical intra-shelf basin (South Provençal Basin). The drilling operation recovered a total of 180 m of undisturbed sediments in three holes. The lowermost 67 m correspond to the Bedoulian (core LB1) and are here analyzed in high-resolution using geochemical proxies (stable carbon isotopes, stable oxygen isotopes, and carbonate content) and foraminiferal biostratigraphy. Pervasive bioturbation through core LB1 suggests mostly oxygenated bottom water conditions with transient dysoxic episodes, as shown by higher pyrite and glauconite concentrations within the marlstones. Unprecedented resolution over the negative δ<sup>13</sup>C excursion preceding OAE 1a (segment C3) reveals a characteristic double trough extending over ∼5.5 m in core LB1. This long-lasting negative excursion was possibly linked to multiple pulses of enhanced CO2 release to the atmosphere. Estimated sedimentation rates of 1.6–2 cm/kyr indicate that the negative δ<sup>13</sup>C excursion lasted >200 kyr, while the main positive carbon isotope shift (segment C4) had a duration of >300 kyr. Fluctuations in δ<sup>18</sup>O suggest transient episodes of climate warming and cooling at the northern margin of the Tethys or even on a more global scale prior to the onset of OAE 1a.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0195667112000584 ABSTRACT])
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---- Lorenzen, J., Kuhnt, W., Holbourn, A., Flögel, S., Moullade, M., Tronchetti, G., in press. [http://www.sciencedirect.com/science/article/pii/S0195667112000584 A new sediment core from the Bedoulian (Lower Aptian) stratotype at Roquefort-La Bédoule, SE France]. Cretaceous Research, doi:10.1016/j.cretres.2012.03.019
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==CAMPANIAN-MAASTRICHTIAN BIOSTRATIGRAPHY AND MAGNETOSTRATIGRAPHY AT ZUMAIA, SPAIN==
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[[Image:CretaceousResearch_front.gif|left|80px| ]]<font size="2">
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...... We present a new, high-resolution calibration of planktonic foraminiferal and calcareous nannofossil biostratigraphic datums, alongside new magnetostratigraphy. Six planktonic foraminiferal zones (Rugoglobigerina rotundata to Pseudoguembelina hariaensis) and nine nannofossil (sub)zones (UC15e<sup>TP</sup>? to UC20d<sup>TP</sup>) have been identified, encompassing the uppermost Campanian through uppermost Maastrichtian. ...... Differences between the planktonic foraminiferal and nannofossil datums at Zumaia and those from the Tercis boundary stratotype section (France) suggest that the biostratigraphic criteria used to identify the C/M boundary are problematic. We propose, therefore, two alternative, key biostratigraphic datums with which to determine the stratigraphic position of this boundary: the stratigraphic base occurrence datum (BO) of the planktonic foraminifer ''Pseudoguembelina palpebra'' and the top occurrence datum (TO) of the nannofossil ''Broinsonia parca'' subsp. ''constricta''. The C31r/C31n magnetic polarity reversal, and the BOs of the planktonic foraminifer ''Racemiguembelina fructicosa'' and the nannofossil ''Lithraphidites quadratus'' are events that may prove useful in formally defining the lower/upper Maastrichtian boundary.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S019566711200050X ABSTRACT])
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---- Pérez-Rodrígeuz, I., Lees, J.A., Carrasoaña, J.C., Arz, J.A., Arenillas, I., in press. [http://www.sciencedirect.com/science/article/pii/S019566711200050X Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain]. Cretaceous Research, doi:10.1016/j.cretres.2012.03.011
  
  
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'''[[RECENT PUBLICATIONS ON FORAMINIFERA|RECENT PUBLICATIONS ON FORAMINIFERA]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2012 (2)|2012 (2)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2012 (1)|2012 (1)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (5)|2011 (5)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (4)|2011 (4)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (3)|2011 (3)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (2)|2011 (2)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2011 (1)|2011 (1)]] | [[RECENT PUBLICATIONS ON FORAMINIFERA 2010|2010]]'''
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[[category:recent publications]]
 
[[category:recent publications]]

Latest revision as of 16:02, 31 July 2012