Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA 2012 (1)"

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'''[[RECENT PUBLICATIONS ON FORAMINIFERA|RECENT PUBLICATIONS ON FORAMINIFERA]] | [[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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==MESSINIAN PALEOENVIRONMENTAL EVOLUTION BASED ON BENTHIC FORAMINIFERA==
  
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[[Image:PPP_front.gif|left|80px| ]]<font size="2">
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Benthic foraminiferal assemblages of a drill core from the lower Guadalquivir Basin (SW Spain) have been analyzed in order to reconstruct the paleoenvironmental evolution in the vicinity of the Betic seaways during the Messinian. Changes in the abundance of certain marker species, planktonic/benthic ratio (P/B ratio), paleodepth estimated with a transfer function, content of sand grains and presence of glauconitic layers indicate a complete transgressive–regressive sea-level cycle from the bottom to the top of the section. An abrupt sea-level rise, from inner-middle shelf to middle slope, is recorded at the lowermost part of the core (latest Tortonian–earliest Messinian), followed by a relatively rapid shallowing from middle slope to outer shelf. Magnetobiostratigraphic data show that this sea-level fall postdates the onset of the Messinian salinity crisis (MSC) in the Mediterranean. Finally, the early Pliocene deposits are interpreted as inner-middle shelf.
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Changes in the benthic foraminiferal assemblages are mainly controlled by the trophic conditions, specifically by the quantity and quality of the organic matter reaching the sea floor. The upper slope and part of the outer shelf assemblages are highly diverse and dominated by shallow infaunal species, indicating a generally mesotrophic environment with moderate oxygenation. These environments have likely been affected by repeated upwelling events, documented by increased abundance of ''Uvigerina peregrina'' s.l., an opportunistic species thriving in environments with enhanced labile organic matter supply. The assemblages of the transitional interval between upper slope to outer shelf, and of the outer shelf are generally characterized by a relatively low diversity and epifaunal-shallow infaunal taxa, indicating oligotrophic and well-oxygenated conditions. The inner-middle shelf assemblages are characterized by very low diversity and dominance of intermediate to deep infaunal taxa, suggesting an eutrophic environment with low oxygen content. These assemblages are dominated by ''Nonion fabum'' and ''Bulimina elongata'', two taxa that are able to feed from continental low-quality organic matter,most likely derived from river run-off.
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018212000879 ABSTRACT])
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---- Pérez-Asensio, J.N., Aguirre, J., Schmiedl, G., Civis, J., 2012. [http://www.sciencedirect.com/science/article/pii/S0031018212000879 Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera]. Palaeogeography, Palaeoclimatology, Palaeoecology 326-328, 135-151.
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== THE MEANING OF BIRTH AND DEATH - CASE STUDY WITH PLANKTIC FORAMINIFERA==
 
== THE MEANING OF BIRTH AND DEATH - CASE STUDY WITH PLANKTIC FORAMINIFERA==
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---- Ezard, T.H.G., Pearson, P.N., Aze, T., Purvis, A., 2012. [http://rsbl.royalsocietypublishing.org/content/8/1/139.abstract The meaning of birth and death (in macroevolutionary birth–death models]. biology letters 8 (1), 139--142.
 
---- Ezard, T.H.G., Pearson, P.N., Aze, T., Purvis, A., 2012. [http://rsbl.royalsocietypublishing.org/content/8/1/139.abstract The meaning of birth and death (in macroevolutionary birth–death models]. biology letters 8 (1), 139--142.
  
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== GLOBAL DECLINE IN OCEAN VENTILATION AND PRODUCTIVITY DRUING THE PETM==
 
== GLOBAL DECLINE IN OCEAN VENTILATION AND PRODUCTIVITY DRUING THE PETM==
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---- Alegret, L., Thomas, E., Lohmann, K.C., in press. [http://www.pnas.org/content/early/2011/12/28/1110601109.abstract End-Cretaceous marine mass extinction not caused by productivity collapse]. PNAS, doi: 10.1073/pnas.1110601109  
 
---- Alegret, L., Thomas, E., Lohmann, K.C., in press. [http://www.pnas.org/content/early/2011/12/28/1110601109.abstract End-Cretaceous marine mass extinction not caused by productivity collapse]. PNAS, doi: 10.1073/pnas.1110601109  
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== BIOGEOGRAPHY AND ECOSTRATIGRAPHY OF QUATERNARY PLANKTIC FORAMINIFERAL TAPHOCOENOSES ==
 
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The Leeward Islands lie within an oceanographically complex area influenced by North Atlantic Gyre flow and the Orinoco plume. Late Quaternary planktonic foraminiferal assemblages are reported from three middle bathyal piston cores (from NW to SE: En20-2, En20-10, En20-16) in the Leeward Islands. En20-2 was obtained closest to the 200 m bathymetric contour, En20-10 farthest offshore. The bathyal benthonic foraminifera from En20-2 are indicative of high surface productivity. The planktonic foraminiferal assemblages differ between the cores. The “''Globigerinoides ruber'' group” (= white and pink ''G. ruber'' + ''G. cyclostomus'') typically increases shoreward, but in this study it was most abundant in En20-10. ...... Comparison with benthonic foraminiferal distributions suggests that the following planktonic species have potential as indicators of surface productivity, ''Globigerinella aequilateralis'', ''Globigerinita glutinata'' and ''Globorotalia inflata'' being indicative of enhanced surface productivity and ''Globigerinoides immaturus'', ''G. trilobus'' var. and ''Globorotalia tumida'' of low surface productivity. Bottom-up SHE Analysis for Biozone Identification (SHEBI) indicates that each core contains several abundance biozones (ABs), but these do not correlate between the cores. Alpha diversities were S<sub>E</sub> = 8.3 – 14.3 effective species, while beta diversities ranged from 0.65 – 1.54, but only two were statistically significant. Complementarities (64.7–87.6%) indicate that the AB boundaries reflect changes in the relative abundances of species, not overall diversity.
 
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<font size="2">([http://www.sciencedirect.com/science/article/pii/S0377839812000023 ABSTRACT])
 
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---- Wilson, B., in press. [http://www.sciencedirect.com/science/article/pii/S0377839812000023 Biogeography and ecostratigraphy of late quaternary planktonic foraminiferal taphocoenoses in the Leeward Islands, Lesser Antilles, NE caribbean Sea]. Marine Micropaleontology, doi:10.1016/j.marmicro.2011.12.002
 
  
  
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'''[[RECENT PUBLICATIONS ON FORAMINIFERA|RECENT PUBLICATIONS ON FORAMINIFERA]] | [[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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{{Recent Publications on Foraminifera Navigation}}<font size="2">
  
 
[[category:recent publications]]
 
[[category:recent publications]]

Latest revision as of 18:01, 23 July 2012