Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA"
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+ | ==MIDDLE EOCENE ABYSSAL BENTHIC FORAMINIFERA IN THE EASTERN EQUATORIAL PACIFIC== | ||
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+ | [[Image:Journal_Of_Paleontology_cover.jpg |left|80px|]]<font size="2"> | ||
+ | We report on the faunal transition of benthic foraminifera during the middle Eocene at Site U1333 (4862 m water depth, 3,560–3,720 m paleo-water depth) of Integrated Ocean Drilling Program Expedition 320 in the eastern equatorial Pacific Ocean. ...... Based on Q-mode cluster analysis, four sample clusters were recognized and their stratigraphic distributions were generally discriminated in the lower and upper parts of the study interval. Thus, there was only a small faunal transition in the abyssal eastern equatorial Pacific during the middle to late-middle Eocene. The faunal transition recognized in this study may be related to recovery processes following intense carbonate corrosiveness in the eastern equatorial Pacific during MECO. | ||
+ | <font size="2">([http://www.psjournals.org/doi/abs/10.1666/12-107 ABSTRACT]) | ||
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+ | ----Takata, H., Nomura, R., Tsujimoto, A. and Khim, B.-K., 2013. [http://www.psjournals.org/doi/abs/10.1666/12-107 Abyssal Benthic Foraminifera in the Eastern Equatorial Pacific (IODP Exp 320) During the Middle Eocene]. Journal of Paleontology 87 (6), 1160-1185. | ||
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+ | ==MOLECULAR EVIDENCE FOR LESSEPSIAN INVASION OF SORITIDS== | ||
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+ | [[Image:PLoS_ONE.jpg|left|80px|]]<font size="2"> | ||
+ | The Mediterranean Sea is considered as one of the hotspots of marine bioinvasions, largely due to the influx of tropical species migrating through the Suez Canal, so-called Lessepsian migrants. Several cases of Lessepsian migration have been documented recently, however, little is known about the ecological characteristics of the migrating species and their aptitude to colonize the new areas. This study focused on Red Sea soritids, larger symbiont-bearing benthic foraminifera (LBF) that are indicative of tropical and subtropical environments and were recently found in the Israeli coast of the Eastern Mediterranean. We combined molecular phylogenetic analyses of soritids and their algal symbionts as well as network analysis of Sorites orbiculus Forskål to compare populations from the Gulf of Elat (northern Red Sea) and from a known hotspot in Shikmona (northern Israel) that consists of a single population of ''S. orbiculus''. ...... | ||
+ | <font size="2">([http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0077725 ABSTRACT]) | ||
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+ | ----Merkado, G., Holzmann, M., Apothéloz-Perret-Gentil, L., Pawlowski, J., Abdu, U., Almogi-Labin, A., Hyams-Kaphzan, O., Bakhrat, A. and Abramovich, S., 2013. [http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0077725 Molecular Evidence for Lessepsian Invasion of Soritids (Larger Symbiont Bearing Benthic Foraminifera)]. PLoS ONE 8(10): e77725. doi:10.1371/journal.pone.0077725 | ||
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+ | ==FLEXIBILITY IN SYMBIOTIC PARTNERSHIPS ALONG A NATURAL TEMPERATURE GRADIENT== | ||
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+ | [[Image:MEPS_front.jpg|left|80px|]]<font size="2"> | ||
+ | Benthic foraminifera of the family Soritinae are important members of coral reef communities, contributing to carbonate deposition on coral reefs. These giant protists form photo-symbiotic associations with microalgae of the genus ''Symbiodinium''. The extent of flexibility in foraminefera-Symbiodinium partnerships is not well understood. While some studies suggest foraminifera exhibit strong specificity with regard to symbiont choice, recent work illustrated that at least a few taxa are able to host >1 symbiont type. We explored the symbiont diversity of a widely distributed soritid foraminifera (''Marginopora vertebralis''), sampling 369 individuals from 16 populations distributed across a wide latitudinal gradient (31 to 9°S) in the western Pacific Ocean using the internal transcribed spacer region 2 (ITS2) of rDNA. ...... | ||
+ | <font size="2">([http://www.int-res.com/abstracts/meps/v491/p33-46/ ABSTRACT]) | ||
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+ | ----Momigliano, P. and Uthicke, S., 2013. [http://www.int-res.com/abstracts/meps/v491/p33-46/ Symbiosis in a giant protist (''Marginopora vertebralis'', Soritinae): flexibility in symbiotic partnerships along a natural temperature gradient]. Marine Ecology Progress Series 491, 33-46. | ||
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+ | ==BENTHIC FORAMINIFERAL COMMUNITY CHANGES AND THEIR RELATIONSHIPS TO ENVIRONMENTAL DYNAMICS IN INTERTIDAL MUDDY SEDIMENTS== | ||
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+ | [[Image:MEPS_front.jpg|left|80px|]]<font size="2"> | ||
+ | The temporal and vertical variability of live intertidal benthic foraminifera was studied in parallel to environmental variables such as porewater and overlying water nutrients, salinity, temperature, sedimentary pigments and organic carbon. ...... multivariate regression analysis for the whole community assemblage showed that the significant community composition changes over time in the surface layer could be related to fluctuations of several environmental variables, mainly those related to sediment food availability. The macroalgal bloom that occurred during the winter months had no detectable effect on benthic foraminiferal abundance or community patterns. Overall, the intertidal foraminiferal community in the Bay of Cádiz showed a highly dynamic character and a clear vertical distribution which could be effectively captured by studying the uppermost sediment layer at sub-centimetric vertical resolution. | ||
+ | <font size="2">([http://www.int-res.com/abstracts/meps/v490/p121-135/ ABSTRACT]) | ||
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+ | ----Papaspyrou, S., Diz, P., Garcia-Robiedo, E., Corzo, A. and Jimenez-Arias, J.-L., 2013. [http://www.int-res.com/abstracts/meps/v490/p121-135/ Benthic foraminiferal community changes and their relationship to environmental dynamics in intertidal muddy sediments (Bay of Cádiz, SW Spain)]. Marine Ecology Progress Series 490, 121-135. | ||
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+ | ==FORAMINIFERA AND SEQUENCE STRATIGRAPHY OF MIOCENE ON THE EASTERN SIDE OF THE GULF OF SUEZ, EGYPT== | ||
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+ | [[Image:NeuesJahrbuch_front.jpeg|left|80px|]]<font size="2"> | ||
+ | Stratigraphical studies of Miocene exposures on the eastern side of the Gulf of Suez (Wadi Gharandal, Wadi Baba and Wadi Feiran) reveals conspicuous vertical and lateral facies variations due to syngenetic tectonic activity related to rifting. Studied samples include 88 species of foraminifera (39 planktonics and 49 benthonics). Six planktonic biozones (M2-M7) were distinguished. The sequence statigraphical investigation of the Burdigalian to Serravallian succession reveals six third-order depositional sequences, bounded by physical unconformity surfaces reflecting phases of sub-aerial exposure, deposition of alluvial fans, polymictic conglomerates, evaporites and the presence of a faunal break, which could be correlated within and outside Egypt. These sequence boundaries are primarily related to regional tectonism associated with rifting or related to eustatic sea-level fluctuations. | ||
+ | <font size="2">([http://www.schweizerbart.de/papers/njgpa/detail/268/79915/Fusulinid_zonation_of_the_Late_Moscovian_Early_Sak ABSTRACT]) | ||
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+ | ----Heywaidy, A.G.A., Farouk, S., Ayyad, H.M., 2013.[http://www.schweizerbart.de/papers/njgpa/detail/270/81041/Foraminifera_and_sequence_stratigraphy_of_Burdigal Foraminifera and sequence stratigraphy of Burdigalian – Serravallian successions on the eastern side of the Gulf of Suez, southwestern Sinai, Egypt]. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 270(2), 151-170. | ||
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+ | ==PALEOVARSOVIELLA AND PALEOVARSOVIELLINAE, NEW NAMES FOR THE FORAMINIFERAL GENUS ''Varsoviella'', AND SUBFAMILY VARSOVIELLINAE== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | More than two decades ago, Gawor-Biedowa (1987) described a number of benthic foraminifers from Late Cretaceous deposits in Poland. At that time she proposed a new genus ''Varsoviella'', although this name was already preoccupied by the validly named rhabdocoel flatworm ''Varsoviella'' Gieysztor and Wiszniewski, 1947 ...... | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/464.extract ABSTRACT]) | ||
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+ | ----Van Steenkiste, N. and Artois, T., 2013. [http://jfr.geoscienceworld.org/content/43/4/464.extract ''Paleovarsoviella'' and Paleovarsoviellinae, new names for the foraminiferal genus ''Varsoviella'' Gawor-Biedowa, 1987, and subfamily Varsoviellinae Gawor-Biedowa, 1987]. Journal of Foraminiferal Research 43 (4), 464. | ||
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+ | ==APTIAN–ALBIAN PLANKTIC FORAMINIFERA FROM DSDP SITE 364 (OFFSHORE ANGOLA)== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | This work presents a taxonomic, biostratigraphic and paleoecological study of planktic foraminifera recovered from the Aptian–Albian carbonate-dominated succession of Deep Sea Drilling Project (DSDP) Site 364, located in the Kwanza Basin (offshore Angola). Twenty-nine planktic foraminiferal species were identified, enabling the identification of late Aptian–late Albian biozones, from the ''Hedbergella trocoidea'' Zone to the ''Pseudothalmanninella ticinensis'' Zone. ...... | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/443.abstract ABSTRACT]) | ||
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+ | ----Kochhann, K.G.D, Koutsoukos, E.A.M., Fauth, G. and Sial, A.N., 2013. [http://jfr.geoscienceworld.org/content/43/4/443.abstract Aptian–Albian planktic foraminifera from DSDP Site 364 (Offshore Angola): Biostratigraphy, paleoecology, and paleoceanographic signicifance]. Journal of Foraminiferal Research 43 (4), 443-463. | ||
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+ | ==ECOLOGICAL DISTRIBUTION OF RECENT DEEP-WATER FORAMINIFERA AROUND NEW ZEALAND== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | Census counts (>63 μm) of 461 species in 361 samples are used as the basis for recognizing and mapping associations of deep-sea benthic foraminifera (50–5000-m depth) around New Zealand, southwest Pacific (28–60°S, 155°E–170°W). Fourteen faunal associations are identified by cluster analysis with five of these subdivided into 20 subassociations. ...... A major reason for this study was to understand the environmental drivers of foraminiferal faunal distribution in this region to assist in paleoenvironmental interpretations of fossil faunas which have a significant regional character. Canonical correspondence analysis indicates that the distribution of bathyal and abyssal associations is more strongly influenced by depth-related variables, while shallower associations are influenced by latitude-related differences in surface-water characteristics. ...... Environmental variables related to bottom-current strength appear to drive the faunal composition of three associations at shelf and bathyal depths. Cluster analysis enables the recognition of 22 anomalously deep faunas that are inferred to have a significant displaced content. There are no significant diversity trends correlated with depth, but species diversity decreases with increasing latitude at all depths. | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/415.abstract ABSTRACT]) | ||
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+ | ----Hayward, B.W., Sabaa, A.T., Grenfell, H.R., Neil, H. and Bostock, H., 2013. [http://jfr.geoscienceworld.org/content/43/4/415.abstract Ecological distribution of recent deep-water foraminifera around New Zealand]. Journal of Foraminiferal Research 43 (4), 415-442. | ||
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+ | ==WEIGHT LOSS AND ELIMINATION OF PLANKTONIC FORAMINIFERAL TESTS IN A DISSOLUTION EXPERIMENT== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | Their ubiquitous distribution and common occurrence in marine sediments make planktonic foraminiferal tests an ideal archive of past physical conditions of the upper oceans. However, their tests are prone to dissolution, especially in the deep sea. Their species-dependent removal from sediments is well-recorded, and is exhibited by the absence of some species after complete test disintegration, while others still remain. In order to further understand the dissolution process of planktonic foraminiferal calcite, we treated tests of ''Globorotalia cult rata'', ''Globigerinoides ruber'', and ''Neogloboquadrina dutertrei'' (315–355 μm intermediate diameter) with a weak buffered acetic acid. ...... | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/406.abstract ABSTRACT]) | ||
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+ | ----Regenberg, M., Schröder, J.F., Jonas, A.-S., Woop, C. and Gorski, L., 2013. [http://jfr.geoscienceworld.org/content/43/4/406.abstract Weight loss and elimination of planktonic foraminiferal tests in a dissolution experiment]. Journal of Foraminiferal Research 43 (4), 406-414. | ||
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+ | ==SYSTEMATIC TAXONOMY OF EARLY–MIDDLE MIOCENE PLANKTONIC FORAMINIFERA FROM THE EQUATORIAL PACIFIC OCEAN== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | Integrated Ocean Drilling Program Expedition 320/321 at Site U1338 (equatorial Pacific Ocean) recovered lower–middle Miocene (17–13.5 Myr) sediments containing unusually well-preserved and diverse planktonic foraminifera. Previous taxonomic study of planktonic foraminifera from this interval in the eastern Pacific Ocean has been hindered by the absence of biogenic carbonate. Here we present a taxonomic analysis of these foraminifera, including wall textures and species variability, supported by scanning electron micrographs. Specimens exhibit open pore spaces, little evidence of calcitic overgrowth on the wall surface, and in many cases spines. Fifty-five species are recorded, including ''Dentoglobigerina juxtabinaiensis'' n. sp. Dominant genera include ''Paragloborotalia'' and ''Globigerinoides'' with common ''Dentoglobigerina''. | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/374.abstract ABSTRACT]) | ||
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+ | ----Fox, L.R. and Wade, B.S., 2013. [http://jfr.geoscienceworld.org/content/43/4/374.abstract Planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338]. Journal of Foraminiferal Research 43 (4), 374-405. | ||
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+ | ==FORAMINIFERAL RECORD OF SURFACE PRODUCTIVITY CHANGES DURING THE CONSTRICTION AND CLOSURE OF THE CENTRAL AMERICAN SEAWAY== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | We investigated middle Miocene–Pleistocene deep-sea benthic foraminifera from IODP Hole U1338B in the eastern equatorial Pacific (EEP). Starting at ~12 Ma, periodic constriction and closure of the Central American Seaway and resulting productivity fluctuations led to distinct changes in benthic foraminiferal composition at 9.5, 5.6–5, 4.5, and 2.1 Ma in the EEP. A temporal increase in high-productivity taxa, known as the late Miocene–early Pliocene “biogenic bloom,” produced a high organic flux to the seafloor from 6.4–5.4 Myr. Our results suggest that, while overall productivity increased at that time, seasonal inputs of phytodetritus did not until after 4.5 Ma, when upwelling, recognized by an abrupt rise in ''Epistominella exigua'', increased during another constriction of the Central American Seaway, marking the beginning of modern oceanographic conditions in the EEP. Although foraminiferal diversity increased during the late Miocene–early Pliocene biogenic bloom, it was not enhanced by the high phytodetrital input from 4.5–3 Myr. | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/361.abstract ABSTRACT]) | ||
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+ | ----Tsujimoto, A., Nomura, R., Takata, H. and Kimoto, K., 2013. [http://jfr.geoscienceworld.org/content/43/4/361.abstract A deep-sea benthic foraminiferal record of surface productivity changes during the constriction and closure of the Central American Seaway: IODP Hole U1338B, eastern equatorial Pacific]. Journal of Foraminiferal Research 43 (4), 361-373. | ||
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+ | ==BENTHIC FORAMINIFERAL DISTRIBUTION FROM A PERMANENTLY STRATIFIED MARGINAL SEA (MARMARA SEA, TURKEY)== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | Detailed examination of four sediment fractions between 63–500 μm showed that benthic foraminiferal assemblages (undifferentiated living + dead) collected from 23 surface-sediment samples along the Marmara Sea coast were dominated by smaller (<250-μm) individuals, averaging 95% of the total fauna. Higher foraminiferal density, species diversity, and restricted size frequency of some species within the 63–250-μm fraction indicate that different lower sieve limits will cause a significant variation in the composition of local assemblages. ...... | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/340.abstract ABSTRACT]) | ||
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+ | ----Kirci-Elmas, E., 2013. [http://jfr.geoscienceworld.org/content/43/4/340.abstract Benthic foraminiferal distribution (living and dead) from a permanently stratified marginal sea (Marmara Sea, Turkey)]. Journal of Foraminiferal Research 43 (4), 340-360. | ||
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+ | ==TAXONOMY AND PHYLOGENY OF THE TROCHOLINIDAE (INVOLUTININA)== | ||
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+ | [[Image:JFR_cover.gif|left|80px|]]<font size="2"> | ||
+ | Exceptionally well-preserved trochospirally coiled Involutinina have been found in Late Triassic (Wallowa Mountains, Oregon, U.S.A.) and Early Jurassic (northern Calcareous Alps, Austria) carbonate rocks. Their remarkable preservation, related to impregnation of the test prior to recrystallization, allowed us to observe features usually obliterated by diagenetic and metamorphic processes. This paper provides a revision of the morphology, structure, systematic position, phylogeny, and stratigraphic range of the family Trocholinidae Kristan-Tollmann. New criteria permitting the distinction between trocholinid genera, even in cases of intense recrystallization, are presented. An identification key and a new, monophyletic tree are proposed for the whole family. ...... | ||
+ | <font size="2">([http://jfr.geoscienceworld.org/content/43/4/317.abstract ABSTRACT]) | ||
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+ | ----Rigaud, S., Blau, J., Martini, R. and Rettori R., 2013. [http://jfr.geoscienceworld.org/content/43/4/317.abstract Taxonomy and phylogeny of the Trocholinidae (Involutinina)]. Journal of Foraminiferal Research 43 (4), 317-339. | ||
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+ | ==CALCIFICATION INTENSITY IN PLANKTONIC FORAMINIFERA REFLECTS AMBIENT CONDITIONS IRRESPECTIVE OF ENVIRONMENTAL STRESS== | ||
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+ | [[Image:Biogeosciences_front.jpg|left|80px|]]<font size="2"> | ||
+ | ...... The amount of calcite deposited by planktonic Foraminifera during calcification has been hypothesized to reflect a range of environmental factors. However, it has never been assessed whether their calcification only passively responds to the conditions of the ambient seawater or whether it reflects changes in resource allocation due to physiological stress. To disentangle these two end-member scenarios, an experiment is required where the two processes are separated. A natural analogue to such an experiment occurred during the deposition of the Mediterranean sapropels, where large changes in surface water composition and stratification at the onset of the sapropel deposition were decoupled from local extinctions of planktonic Foraminifera species. We took advantage of this natural experiment and investigated the reaction of calcification intensity, expressed as mean area density (MAD), of four species of planktonic Foraminifera to changing conditions during the onset of Sapropel S5 (126–121 ka) in a sediment core from the Levantine Basin. ...... These results indicate that the high-salinity environment of the glacial Mediterranean Sea prior to sapropel deposition induced more intense calcification, whereas the freshwater injection to the surface waters associated with sapropel deposition inhibited calcification. The results are robust to changes in carbonate preservation and collectively imply that changes in normalized shell weight in planktonic Foraminifera should reflect mainly abiotic forcing. | ||
+ | <font size="2">([http://www.biogeosciences.net/10/6639/2013/bg-10-6639-2013.html ABSTRACT]) | ||
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+ | ----Weinkauf, M.F.G., Moller, T., Koch, M.C. and Kučera, M., 2013. [http://www.biogeosciences.net/10/6639/2013/bg-10-6639-2013.html Calcification intensity in planktonic Foraminifera reflects ambient conditions irrespective of environmental stress]. Biogeosciences 10, 6639-6655. | ||
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+ | ==EFFECT OF OCEAN ACIDIFICATION ON ''Ammonia'' sp.== | ||
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+ | [[Image:Biogeosciences_front.jpg|left|80px|]]<font size="2"> | ||
+ | About 30% of the anthropogenically released CO<sub>2</sub> is taken up by the oceans; such uptake causes surface ocean pH to decrease and is commonly referred to as ocean acidification (OA). Foraminifera are one of the most abundant groups of marine calcifiers, estimated to precipitate ca. 50 % of biogenic calcium carbonate in the open oceans. We have compiled the state of the art literature on OA effects on foraminifera, because the majority of OA research on this group was published within the last three years. Disparate responses of this important group of marine calcifiers to OA were reported, highlighting the importance of a process-based understanding of OA effects on foraminifera. We cultured the benthic foraminifer ''Ammonia'' sp. under a range of carbonate chemistry manipulation treatments to identify the parameter of the carbonate system causing the observed effects. This parameter identification is the first step towards a process-based understanding. We argue that [CO<sub>3</sub><sup>2−</sup>] is the parameter affecting foraminiferal size-normalized weights (SNWs) and growth rates. Based on the presented data, we can confirm the strong potential of ''Ammonia'' sp. foraminiferal SNW as a [CO<sub>3</sub><sup>2−</sup>] proxy. | ||
+ | <font size="2">([http://www.biogeosciences.net/10/6185/2013/bg-10-6185-2013.html ABSTRACT]) | ||
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+ | ----Keul, N., Langer, G., de Nooijer, L.J. and Bijma, J., 2013. [http://www.biogeosciences.net/10/6185/2013/bg-10-6185-2013.html Effect of ocean acidification on the benthic foraminifera Ammonia sp. is caused by a decrease in carbonate ion concentration]. Biogeosciences 10, 6185-6198. | ||
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+ | ==MULTIDISCIPLINARY STUDY OF RARELY RECOVERED PARTS OF DEEP-SEA SANTONIAN-CAMPANIAN TRANSITION== | ||
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+ | <font size="2"> | ||
+ | The Cretaceous deep-sea record of the Santonian–Campanian transition is commonly interrupted by an extensive unconformity (representing <10 Myr of hiatus). The resultant palaeoceanographic gap can now be partly bridged by a recent short core of pelagic ooze from Shatsky Rise (Integrated Ocean Drilling Program (IODP) Site U1348), with precise multidisciplinary age constraints developed herein. New oxygen isotope data from very well-preserved benthic foraminifera, together with accurately compiled comparable benthic data from previous Pacific deep-sea sections, exhibit a large (c. +1‰) early Campanian shift. We propose the Santonian–Campanian climatic transition was not gradual but was the first major cooling step after sustained mid-Cretaceous hothouse conditions. | ||
+ | <font size="2">([http://jgs.lyellcollection.org/content/170/3/381.abstract ABSTRACT]) | ||
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+ | ----Ando, A., Woodard, S.C., Evans, H.F., Littler, K., Herrmann, S., Macleod, K.G., Kim, S., Khim, B.-K., Robinson, S.A. and Huber, B.T., 2013. [http://jgs.lyellcollection.org/content/170/3/381.abstract An emerging palaeoceanographic ‘missing link’: multidisciplinary study of rarely recovered parts of deep-sea Santonian–Campanian transition from Shatsky Rise]. Journal of the Geological Society 170 (5), 381-384. | ||
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+ | ==THE CRETACEOUS-TERTIARY BOUNDARY TRANSITION IN NE BRAZIL== | ||
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+ | <font size="2"> | ||
+ | At 7800 km from Yucatan the Cretaceous–Tertiary boundary (KTB) transition of the Poty Quarry, NE Brazil, is the most distant locality with published accounts of Chicxulub impact–tsunami deposits, impact spherules and Ir anomaly. New investigations based on sedimentology, biostratigraphy, mineralogy and geochemistry fail to confirm these reports. Latest Maastrichtian planktic foraminiferal zones CF1 below an erosive and bioturbated disconformity and early Danian zone P1a(1) above indicate a short hiatus, with the KTB clay (zone P0), the Ir anomaly and the characteristic negative δ<sup>13</sup>C excursion missing. The disconformity coincides with the globally recognized latest Maastrichtian sea-level fall. Above the disconformity, an upward-fining micro-conglomerate with abundant reworked Cretaceous foraminifera, sub-angular phosphate clasts, calcitic and phosphatic spheroids along with an early Danian zone P1a(1) assemblage is interpreted as a gravity-flow deposit. Common spheroids throughout the late Campanian–Maastrichtian appear to be chamber infillings of the benthic foraminifer ''Dentalina alternata''. Minor Ir anomalies in thin clay layers of zone Pla and no evidence of the Chicxulub impact reveal that the Poty Quarry section remains a very important example of the complex global environmental and sea-level changes observed in KT sequences from North America to Central America that are commonly misinterpreted as impact–tsunami events. | ||
+ | <font size="2">([http://jgs.lyellcollection.org/content/170/2/249.abstract ABSTRACT]) | ||
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+ | ----Gertsch, B., Keller, G., Adatte, T. and Berner, Z., 2013. [http://jgs.lyellcollection.org/content/170/2/249.abstract The Cretaceous–Tertiary boundary (KTB) transition in NE Brazil]. Journal of the Geological Society 170 (5), 249-262. | ||
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+ | ==THE PHYLOGENETIC AND PALAEOGEOGRAPHIC EVOLUTION OF MIOGYPSINIDS== | ||
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+ | <font size="2"> | ||
+ | Access to new material from South Africa, Corsica, Cyprus, Syria and Sumatra has allowed a systematic biostratigraphic comparison and correlation of the miogypsinids from the Mediterranean–West Africa and the Indo-Pacific provinces, and for the first time from South Africa. Twelve new species have been identified ......During the Chattian and Aquitanian significant miogypsinid forms evolved in the Mediterranean from the morphologically distinct Mediterranean ''Neorotalia'' and migrated, within a few million years of their first appearance, into the Indo-Pacific, where they diversified further. The tectonically driven closure of the seaway between the Mediterranean and the Indo-Pacific in the Burdigalian triggered the extinction of Mediterranean miogypsinids in the Langhian. Miogypsinids survived in the Indo-Pacific into the Serravallian. | ||
+ | <font size="2">([http://jgs.lyellcollection.org/content/170/1/185.abstract ABSTRACT]) | ||
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+ | ----Boudagher-Fadel, M.K. ad Price, G.D., 2013. [http://jgs.lyellcollection.org/content/170/1/185.abstract The phylogenetic and palaeogeographic evolution of the miogypsinid larger benthic foraminifera]. Journal of the Geological Society 170 (5), 185-208. | ||
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+ | ==BIOSTRATIGRAPHY OF THE YOUNGEST SEDIMENTS OF THE TATRA MASSIF, CENTRAL WESTERN CARPATHIANS== | ||
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+ | <font size="2"> | ||
+ | The foraminiferal and radiolarian biostratigraphy of selected sections of the Zabijak Formation, the youngest sediments of the Tatra massif (Central Western Carpathians), have been studied. Benthic foraminifers, mainly agglutinated species, occur abundantly and continuously throughout the studied succession, while planktic foraminifers are generally sparse. Five planktic and two benthic foraminiferal zones have been recognized. The marly part of the Zabijak Formation comprises the ''Pseudothalmanninella ticinensis'' (Upper Albian) through the ''Rotalipora cushmani'' (Upper Cenomanian) planktic foraminiferal zones, and the ''Haplophragmoides nonioninoides'' and ''Bulbobaculites problematicus'' benthic foraminiferal zones. The radiolarians were recognized exclusively in the Lower Cenomanian part of the formation. | ||
+ | <font size="2">([http://agp.org.pl/table/abstracts/63-2.htm ABSTRACT]) | ||
+ | |||
+ | ----Bąk, K. and Bąk, M., 2013. [http://agp.org.pl/table/abstracts/63-2.htm Foraminiferal and radiolarian biostratigraphy of the youngest (Late Albian through Late Cenomanian) sediments of the Tatra massif, Central Western Carpathians]. Acta Geologica Polonica 63, 223–237. | ||
+ | |||
+ | |||
+ | ==NEW SUPRAORDINAL CLASSIFICATION OF FORAMINIFERA: MOLECULES MEET MORPHOLOGY== | ||
+ | |||
+ | [[Image:Marine_Micropaleontology_Front.gif |left|80px|]]<font size="2"> | ||
+ | The limitations of a traditional morphology-based classification of Foraminifera have been demonstrated by molecular phylogenetic studies for several years now. Despite the accumulation of molecular data, no alternative higher-level taxonomic system incorporating these data has been proposed yet. Here, we present a new supraordinal classification of Foraminifera based on an updated SSU rDNA phylogeny completed with the description of major morphological trends in the evolution of this group. According to the new system, multi-chambered orders are grouped in two new classes: [[Tubothalamea|Tubothalamea]] and [[Globothalamea|Globothalamea]]. Naked and single-chambered Foraminifera possessing agglutinated or organic-walled tests are arranged into a paraphyletic assemblage of “[[monothalamids|Monothalamids]]”. The new system maintains some multi-chambered calcareous orders, such as Rotaliida, Miliolida, Robertinida and Spirillinida, although their definitions have been modified in some cases to include agglutinated taxa. The representatives of the planktonic order Globigerinida are tentatively included in the order Rotaliida. The agglutinated Textulariida are probably paraphyletic. The position of the order Lagenida is uncertain because reliable molecular data are only available for one species. The new classification system separates orders or families, which differ in basic chamber shapes, prevailing mode of coiling and distance between successive apertures. It appears that these features correspond better to the main evolutionary trends in Foraminifera than wall composition and structure, both used in traditional classification. | ||
+ | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0377839813000327 ABSTRACT]) | ||
+ | |||
+ | ----Pawlowski, J., Holzmann, M. and Tyszka, J., 2013. [http://www.sciencedirect.com/science/article/pii/S0377839813000327 New supraordinal classification of Foraminifera: Molecules meet morphology]. Marine Micropaleontology 100, 1-10. | ||
+ | |||
+ | |||
+ | ==A STABLE AND HOT TURONIAN WITHOUT GLACIAL ∂<sup>18</sup>O EXCURSIONS== | ||
+ | |||
+ | [[Image:Geology_cover.gif|left|80px|]]<font size="2"> | ||
+ | A shift from the icehouse climate in which humans evolved to a Late Cretaceous–like greenhouse climate is an often-repeated cautionary prediction of the consequences of continued anthropogenic CO<sub>2</sub> emissions. The corollary, that understanding the past might help predict the future, has justified many Late Cretaceous studies, but important questions remain about climate stability and sensitivity. New δ<sup>18</sup>O measurements of more than 1000 samples of exceptionally well preserved foraminifera (8 planktic and 11 benthic taxa) from two sites in Tanzania indicate that hot and remarkably stable conditions prevailed in the region during the Turonian, including during a proposed greenhouse glacial event. Planktic taxa have δ<sup>18</sup>O values largely between –4.0‰ and –5.0‰, suggesting surface-water temperatures between 30 and 35 °C. Estimates for seafloor temperatures are between 18 and 25 °C. No parallel shifts in δ<sup>18</sup>O values are observed among planktic and benthic taxa, contradicting an often-cited line of evidence for greenhouse glaciations and supporting an effectively ice-free Turonian world. | ||
+ | <font size="2">([http://geology.gsapubs.org/content/41/10/1083.abstract ABSTRACT]) | ||
+ | |||
+ | ----MacLeod, K.G., Huber, B.T., Berrocoso, Á.J. and Wendler, I., 2013. [http://geology.gsapubs.org/content/41/10/1083.abstract A stable and hot Turonian without glacial δ<sup>18</sup>O excursions is indicated by exquisitely preserved Tanzanian foraminifera]. Geology 41(10), 1083-1086. | ||
+ | |||
+ | |||
+ | ==TESTING THE USE OF FORAMINIFERA TO RECONSTRUCT EARTHQUAKES== | ||
+ | |||
+ | [[Image:Geology_cover.gif|left|80px|]]<font size="2"> | ||
+ | Coastal stratigraphy from the Pacific Northwest of the United States contains evidence of sudden subsidence during ruptures of the Cascadia subduction zone. Transfer functions (empirical relationships between assemblages and elevation) can convert microfossil data into coastal subsidence estimates. Coseismic deformation models use the subsidence values to constrain earthquake magnitudes. To test the response of foraminifera, the accuracy of the transfer function method, and the presence of a pre-seismic signal, we simulated a great earthquake near Coos Bay, Oregon, by transplanting a bed of modern high salt-marsh sediment into the tidal flat, an elevation change that mimics a coseismic subsidence of 0.64 m. The transplanted bed was quickly buried by mud; after 12 mo and 5 yr, we sampled it for foraminifera. Reconstruction of the simulated coseismic subsidence using our transfer function was 0.61 m, nearly identical to the actual elevation change. Our transplant experiment, and additional analyses spanning the A.D. 1700 earthquake contact at the nearby Coquille River 15 km to the south, show that sediment mixing may explain assemblage changes previously interpreted as evidence of pre-seismic land-level change in Cascadia and elsewhere. | ||
+ | <font size="2">([http://geology.gsapubs.org/content/41/10/1067.abstract ABSTRACT]) | ||
+ | |||
+ | ----Engelhart, S.E., Horton, B.P., Nelson, A.R., Hawkes, A.D., Witter, R.C., Wang, K. and Vane, C.H., 2013. [http://geology.gsapubs.org/content/41/10/1067.abstract Testing the use of microfossils to reconstruct great earthquakes at Cascadia]. Geology 41(10), 1067-1070. | ||
+ | |||
+ | |||
+ | ==DIVERSIFICATION PATTERNS OF PLANKTIC FORAMINIFERA IN THE FOSSIL RECORD== | ||
+ | |||
+ | [[Image:Marine_Micropaleontology_Front.gif |left|80px|]]<font size="2"> | ||
+ | Theories of taxonomic diversification dispute whether global diversity has an upper limit set by the strength of biological interactions or grows in unlimited fashion until catastrophic events reset the system. We analyzed a global compendium of fossil planktic foraminifera from the early Cretaceous to the present after correcting for temporal differences in sampling effort. Our results show that their morphological diversity has increased exponentially through time in two different phases. The first phase collapsed at the Cretaceous-Paleogene boundary transition. The second phase developed through the Cenozoic era and declined during the Pliocene-Pleistocene interval, a period of time that was dominated by enhanced climatic and oceanographic instability. In none of these phases diversity reached an equilibrium level. Cenozoic faunas evolved faster than those inhabiting Cretaceous oceans, perhaps as a result of a higher environmental variability. Our results indicate that planktic foraminifera conform to an exponential diversification model. However, because catastrophic events have repeatedly reset the level of biological diversity and have kept it below the maximum, we cannot confirm whether the level of diversity is potentially unlimited. | ||
+ | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0377839813001059 ABSTRACT]) | ||
+ | |||
+ | ----Cermeño, P., Castro-Bugallo, A., Callina, S.M., in press. [http://www.sciencedirect.com/science/article/pii/S0377839813001059 Diversification patterns of planktic foraminifera in the fossil record]. Marine Micropaleontology, http://dx.doi.org/10.1016/j.marmicro.2013.09.003 | ||
+ | |||
+ | |||
+ | ==ALTERNATIVE HYPOTHESES TO EXPLAIN THE EXTINCTION DURING THE MID-PLEISTOCENE CLIMATE TRANSITION== | ||
+ | |||
+ | [[Image:Marine_Micropaleontology_Front.gif |left|80px|]]<font size="2"> | ||
+ | Over 100 cosmopolitan species of deep-sea benthic foraminifera (Extinction Group, Ext. Gp) became extinct during the late Pliocene-middle Pleistocene (3.6-0.55 Ma). Most had elongate, cylindrical tests and terminal apertures with complex modifications. This study provides new hypotheses on the functions of the morphologies that characterised the Ext. Gp and how these features could have been associated with their demise. From our functional morphological analysis we infer that: i) their elongate cylindrical or flabelliform tests, combined with fine perforations and a complex terminal apertural face are indicative of infaunal k-strategists with a low rate of metabolism; ii) their complex apertural faces may also have been an adaptation for gathering or processing their specific phytodetrital food. ...... <br/> | ||
+ | '''Highlights''' | ||
+ | • Functional interpretation of the morphology of deep-sea foraminifera that became extinct during the MPT (Ext. Gp) suggests they had low rates of metabolism. | ||
+ | • Lowered ''p''CO<sub>2</sub> during increasingly severe glacials of the mid-Pleistocene Climate Transition resulted in the decline and loss of many reticulofenestrid nannofossils and increased seasonality of phytoplankton blooms. | ||
+ | • Ext. Gp species may have been out-competed by opportunistic benthic foraminifera that took advantage of the increased seasonality of phytodetrital flux to the deep-sea floor. | ||
+ | • Lowered ''p''CO<sub>2</sub> could have caused the loss of the particular phytoplankton group that was the detrital food of the Ext. Gp. | ||
+ | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0377839813001060# ABSTRACT]) | ||
+ | |||
+ | ----Mancin, N., Hayward, B.W., Trattenero, I., Cobianchi, M., Lupi, C., in press. [http://www.sciencedirect.com/science/article/pii/S0377839813001060# Can the morphology of deep-sea benthic foraminifera reveal what caused their extinction during the mid-Pleistocene Climate Transition?]. Marine Micropaleontology, http://dx.doi.org/10.1016/j.marmicro.2013.09.004 | ||
+ | |||
+ | |||
+ | ==AGGLUTINATED FORAMINIFERA ACROSS THE INDIAN MARGIN OMZ (ARABIAN SEA)== | ||
+ | |||
+ | <font size="2"> | ||
+ | We present a semi-quantitative survey of ‘live’ (stained) and dead hormosinacean foraminifera at six sites (500–2,000 m water depth; bottom-water oxygen concentrations 0.007–2.43 ml L<sup>−1</sup>) across the Indian margin oxygen minimum zone (OMZ). Abundance of stained and dead specimens was highest at 800 m followed by 1,100 m, lowest at 2,000 m (stained) and 500 m (dead). The peak at 800 m possibly represents a release from oxygen stress combined with a rich food supply (‘edge effect’). We recognised 31 species (27 ''Reophax'', 2 ''Hormosinella'', 1 ''Hormosina'' and 1 ''Nodosinella'') among the 605 stained and dead specimens; the majority (21) are apparently undescribed. Species richness was low at 2,000 m; within the OMZ, it was maximal at 1,100 m and minimal at 500 m for both stained and dead populations. Three species (''R. agglutinatus'', ''R''. aff. ''bilocularis'' and ''R. dentaliniformis'') occurred across the entire depth range. However, most species were either confined to the 2,000-m site or to one or more sites within the OMZ. Multivariate analysis of assemblage composition revealed that the 2,000-m site was distinct from shallower sites. Within the OMZ, the 900- and 1,100-m sites were the most similar, and the 500-m site the most distinct. Stained:dead test ratios were maximal at 500–835 m, perhaps reflecting enhanced preservation of cytoplasm at very low oxygen concentrations. At least two Reophax species are common to the Indian and Pakistan margin OMZ; one of these may be confined to the core of the Arabian Sea OMZ. | ||
+ | <font size="2">([http://link.springer.com/article/10.1007/s12526-013-0178-z ABSTRACT]) | ||
+ | |||
+ | ----Taylor, A., Gooday, A.J., in press. [http://link.springer.com/article/10.1007/s12526-013-0178-z Agglutinated foraminifera (superfamily Hormosinacea) across the Indian margin oxygen minimum zone (Arabian Sea)]. Marine Biodiversity, doi:10.1007/s12526-013-0178-z | ||
+ | |||
+ | |||
+ | ==TRACING SEAFLOOR METHANE EMISSIONS IN THE BAIYUN SAG OF THE NORTHERN SOUTH CHINA SEA== | ||
+ | |||
+ | <font size="2"> | ||
+ | Changes in the concentrations of atmospheric greenhouse gases are an important part of the global climate forcing. The hypothesis that benthic foraminifera are useful proxies of local methane emission from the seafloor has been verified on sediment cores by numerous studies. The calcium carbonate (CaCO<sub>3</sub>) content and the high-resolution carbon and oxygen isotope composition of the benthic foraminifera from the core 08CF7, from the northeastern Shenhu gas hydrate drilling area in the Baiyun Sag of the northern South China Sea were analyzed, and the benthic foraminifera’s evidence for methane release from gas hydrate decomposition are presented here for the first time. ...... | ||
+ | <font size="2">([http://link.springer.com/article/10.1007/s12665-012-2201-2 ABSTRACT]) | ||
+ | |||
+ | ----Wang, S., Yan, B. and Yan, W., 2013. [http://link.springer.com/article/10.1007/s12665-012-2201-2 Tracing seafloor methane emissions with benthic foraminifera in the Baiyun Sag of the northern South China Sea]. Environmental Earth Sciences 70(3), 1143-1150. | ||
+ | |||
+ | |||
+ | ==FORAMINIFERAL RESPONSE TO TRACE ELEMENT POLLUTION, THE GULF OF MILAZZO, NE SICILY== | ||
+ | |||
+ | <font size="2"> | ||
+ | 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. ...... | ||
+ | <font size="2">([http://link.springer.com/article/10.1007/s10661-013-3292-2 ABSTRACT]) | ||
+ | |||
+ | ----Cosentino, C., Pepe, F., Scopelliti, G., Calabrò, M., Caruso, A., 2013. [http://link.springer.com/article/10.1007/s10661-013-3292-2 Benthic foraminiferal response to trace element pollution—the case study of the Gulf of Milazzo, NE Sicily (Central Mediterranean Sea)]. Environmental Monitoring and Assessment 185 (10), 8777-8802. | ||
+ | |||
+ | |||
+ | ==ABSENCE OF DIEL VERTICAL MIGRATION DURING THE MIDNIGHT SUN IN THE GRAM STRAIT== | ||
+ | |||
+ | <font size="2"> | ||
+ | The timing of vertical migration in planktonic foraminifera (ex. ontogenetic, diel) is still an open debate. This work aims to investigate the diel vertical migration (DVM) of ''Neogloboquadrina pachyderma'' (''N. pachyderma'') and ''Turborotalita quinqueloba'' (''T. quinqueloba'') in the Arctic during the midnight sun. ''N. pachyderma'' and ''T. quinqueloba'' dominate the total assemblage in the cold Polar Water and warmer North Atlantic Water masses, respectively. Foraminifera were collected at several depths along the Fram Strait. Afterwards sampling was performed at the same station for 24 h at continuous and discrete time intervals. Results show no evidence of planktonic foraminifera DVM since there was no significant variability in the abundance and size distribution during the 24-h collection period. This finding provides information to improve the interpretation of foraminifera in paleoclimatic works. This is especially relevant in the Fram Strait as paleoclimatic studies in this region are fundamental to investigating the history of the Atlantic water inflow into the Arctic Ocean. | ||
+ | <font size="2">([http://link.springer.com/article/10.1007/s10750-013-1669-4 ABSTRACT]) | ||
+ | |||
+ | ----Manno, C. and Pavlov, A.K., in press. [http://link.springer.com/article/10.1007/s10750-013-1669-4 Living planktonic foraminifera in the Fram Strait (Arctic): absence of diel vertical migration during the midnight sun]. Hydrobiologia, doi:10.1007/s10750-013-1669-4 | ||
+ | |||
+ | |||
+ | ==THE PLIENSBACHIAN-TOARCIAN EXTINCTION, A GLOBAL MULTI-PHASED EVENT== | ||
+ | |||
+ | [[Image:PPP_front.gif |left|80px|]]<font size="2"> | ||
+ | ...... We compare stratigraphic ranges of ammonite and foraminiferal species in Pliensbachian–Toarcian successions of western North America to the record in Europe and parts of the Arctic in order to test the geographic extent of the multiple phases of extinction. Our results show six intervals of species level decline that correlate with those recognized in Europe. ...... Recognition of this multi-phased event in three separate ocean basins (paleo Pacific, paleo Arctic, and Tethys Oceans), in at least two taxonomic groups, greatly expands the known geographic extent of this multi-phased event and argues for a controlling mechanism that is global in its reach. In relation to the Volcanic Greenhouse Scenario, our study shows that four of the six pulses of extinction occur within the main-phase of Karoo magmatism. The decline in the Early Pliensbachian, previously thought to be separate from this event, occurs within error range of the onset of Karoo magmatism and the decline in the Late Toarcian coincides with the later stages of magmatism. These observations extend the known duration of this multi-phased extinction event to the Early Pliensbachian and support the Volcanic Greenhouse Scenario, specifically the eruption of the Karoo–Ferrar LIP, as a preeminent factor driving the multi-phased extinction of the Pliensbachian–Toarcian. | ||
+ | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018213002344 ABSTRACT]) | ||
+ | |||
+ | ----Caruthers, A.H., Smith, P.L. and Gröcke, D.R., 2013. [http://www.sciencedirect.com/science/article/pii/S0031018213002344 The Pliensbachian–Toarcian (Early Jurassic) extinction, a global multi-phased event]. Palaeogeography, Palaeoclimatology, Palaeoecology 386, 104-118. | ||
+ | |||
+ | |||
+ | ==THE MORPHOGROUPS OF FORAMINIFERA FROM THE DEVONIAN CARBONATE COMPLEX OF THE PRAGUE SYNFORM, CZECH REPUBLIC== | ||
+ | |||
+ | [[Image:PPP_front.gif |left|80px|]]<font size="2"> | ||
+ | Agglutinated foraminifera from the Lower and lower part of the Middle Devonian, predominantly limestones of the Prague Synform (Barrandian area), were classified into five morphogroups ...... The absence of the deep infaunal morphogroups is characteristic. The morphogroup distribution has been strongly affected by oxygen concentration, the energy of the environment, nutrient availability and post-mortem processes. Intervals with diversified and abundant foraminiferal assemblages can be correlated with positive δ<sup>13</sup>C excursions and also with the deposition of nodular limestones. The Devonian assemblages from the Prague Synform were compared with isochronous assemblages from other regions. Though the taxonomical composition of the Early Devonian assemblages from these areas are rather different, the morphogroup composition is highly comparable, and globally indicates similar life and feeding strategies of the Early Devonian foraminifera. | ||
+ | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018213002551 ABSTRACT]) | ||
+ | |||
+ | ----Holcová, K. and Slavík, L., 2013. [http://www.sciencedirect.com/science/article/pii/S0031018213002551 The morphogroups of small agglutinated foraminifera from the Devonian carbonate complex of the Prague Synform, (Barrandian area, Czech Republic)]. Palaeogeography, Palaeoclimatology, Palaeoecology 386, 210-224. | ||
+ | |||
==BIOFACIES IN THE UPPER MIOCENE-LOWER PLIOCENE IN THE MANZANILLA BAY, NORTHEAST TRINIDAT== | ==BIOFACIES IN THE UPPER MIOCENE-LOWER PLIOCENE IN THE MANZANILLA BAY, NORTHEAST TRINIDAT== | ||
Line 7: | Line 282: | ||
<font size="2"> | <font size="2"> | ||
The Miocene–Pliocene Manzanilla Formation of northern Trinidad marks the arrival of the east-west flowing Orinoco River. Foraminifera were examined quantitatively in samples obtained at ∼5 m intervals from the lowest member of the formation, the San José Calcareous Silt Member, where exposed at eastern Manzanilla Bay and Point Noir. Recovery of ''Globorotalia merotumida'' indicates an age within the ''Globorotalia acostaensis'' Zone through Globorotalia margaritae evoluta Subzone, (N16–N19). Values of the information function (H) and the percentage of the total assemblage as planktonic foraminifera (%P), both traditionally used as palaeodepth indicators, were uncorrelated. ...... <br/> | The Miocene–Pliocene Manzanilla Formation of northern Trinidad marks the arrival of the east-west flowing Orinoco River. Foraminifera were examined quantitatively in samples obtained at ∼5 m intervals from the lowest member of the formation, the San José Calcareous Silt Member, where exposed at eastern Manzanilla Bay and Point Noir. Recovery of ''Globorotalia merotumida'' indicates an age within the ''Globorotalia acostaensis'' Zone through Globorotalia margaritae evoluta Subzone, (N16–N19). Values of the information function (H) and the percentage of the total assemblage as planktonic foraminifera (%P), both traditionally used as palaeodepth indicators, were uncorrelated. ...... <br/> | ||
− | Highlights | + | '''Highlights''' |
• The San José Calcareous Silt Member was deposited under considerable freshwater influence. | • The San José Calcareous Silt Member was deposited under considerable freshwater influence. | ||
Line 225: | Line 500: | ||
----Martinuš, M., Fio, K., Pikelj, K., Aščić, Š., 2013. [http://link.springer.com/article/10.1007/s10347-012-0327-z Middle Miocene warm-temperate carbonates of Central Paratethys (Mt. Zrinska Gora, Croatia): paleoenvironmental reconstruction based on bryozoans, coralline red algae, foraminifera, and calcareous nannoplankton]. Facies, 59(3), 481-504. | ----Martinuš, M., Fio, K., Pikelj, K., Aščić, Š., 2013. [http://link.springer.com/article/10.1007/s10347-012-0327-z Middle Miocene warm-temperate carbonates of Central Paratethys (Mt. Zrinska Gora, Croatia): paleoenvironmental reconstruction based on bryozoans, coralline red algae, foraminifera, and calcareous nannoplankton]. Facies, 59(3), 481-504. | ||
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[[category:recent publications]] | [[category:recent publications]] |