Editorial     

Susana B. Vinzon  Ashish J. Mehta  Johan C. Winterwerp 《Ocean Dynamics》2011,61(2-3):155-155

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Book Review     

Susana Custódio 《Pure and Applied Geophysics》2010,167(11):1453-1454

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Predation and competition effects on the size diversity of aquatic communities     

Xavier D. Quintana  Matías Arim  Anna Badosa  José María Blanco  Dani Boix  Sandra Brucet  Jordi Compte  Juan J. Egozcue  Elvira de Eyto  Ursula Gaedke  Stéphanie Gascón  Luis Gil de Solá  Kenneth Irvine  Erik Jeppesen  Torben L. Lauridsen  Rocío López-Flores  Thomas Mehner  Susana Romo  Martin Søndergaard 《Aquatic Sciences - Research Across Boundaries》2015,77(1):45-57

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Oxfordian reef architecture of the La Manga Formation, Neuquén Basin, Mendoza Province, Argentina     

Ricardo M. Palma  Diego A. Kietzmann  Susana Adamonis  Jos Lpez Gmez 《Sedimentary Geology》2009,221(1-4):127-140

The Neuquén back-arc basin is located on the west margin of the South American platform between latitudes 36° and 40° S. The basin is famous for its continuous sedimentary record from the Late Triassic to Cenozoic comprising continental and marine clastic, carbonate, and evaporitic deposits up to 2.600 m in thickness.The stratigraphical and paleontological studies of the outcrops of the La Manga Formation, Argentina, located near the Bardas Blancas region, Mendoza province (35° S and 69° O) allow the reconstruction of the sedimentary environments of an Oxfordian carbonate ramp, where outer ramp, middle ramp, inner ramp (oolitic shoal), inner ramp margin (patch reef) lagoon and paleokarst were differentiated. The reefs consist of back reef facies and in situ framework of coral boundstones that was formed at the top of shallowing-upward succession.Coral reefs were analyzed by defining coral colonies shapes, paleontological content, coral diversity and taphonomy studies. In some studied sections abundant fragments of gryphaeids, encrusting bryozoans, and isolated sponges provided a suitable substrate for coral colonization; however, other sections show an increase in the proportions of ooids, peloidal and coral intraclasts.The core reef facies is composed of white-grey unstratified and low diversity scleractinian coral limestone dominated by robust and thinly branching corals with cerioid–phocoid growths and massive coral colonies with meandroid–thamnasteroid growth forms.The assemblage is characterized by Actinastraea sp., Australoseris sp., Thamnasteria sp. and Garateastrea sp. Internal facies organization and different types of coral colonies allow to recognize the development of varying framework as well as intercolony areas. A superstratal growth fabric characterizes the coral assemblage. On the basis of coral growth fabric (branche and domal types), the reef of La Manga Formation is considered a typical mixstones. The intercolony areas consist of biomicrites and biomicrorudites containing abundant coral fragments, parautochthonous gryphaeids and another bivalves (Ctenostreon sp.), gastropods (Harpagodes sp., Natica sp.), echinoderms test and spines (Plegiocidaris sp.), miliolids, Cayeuxia sp., Acicularia sp., Salpingoporella sp., intraclasts, ooids, peloids and coated grains.The domal growth forms are probably more protected against biological and physical destruction, meanwhile delicate branching growth forms with very open and fragile framework were more affected and fragmented due to wave action and bioerosion.The reef fabric shows different intervals of truncation as consequence of erosion resulting from coral destruction by storm waves or currents. The maximum flooding surface separates oolitic shoal facies below from the aggradational and progradational coralline limestones facies above. Subsequent sea-level fall and karstification (148 Ma) affected reef and oolitic facies.  相似文献   

An Experimental Study on the Temperature Dependence for the Gas-Phase Reactions of NO3 Radical with a Series of Aliphatic Aldehydes     

B. Cabañas  P. Martín  S. Salgado  B. Ballesteros  E. Martínez 《Journal of Atmospheric Chemistry》2001,40(1):23-39

The absolute rate constants for the gas-phasereactions of the NO₃ radical with a series ofaldehydes such as acetaldehyde, propanal, butanal,pentanal, hexanal and, heptanal were measured overthe temperature range 298–433 K, using a dischargeflow system and monitoring the NO₃ radical byLaser Induced Fluorescence (LIF).The measured rate constants at 298 K for thereaction of NO₃, in units of 10^–14 cm³molecule^–1 s^–1, were as follows:acetaldehyde 0.32 ± 0.04, propanal 0.60 ± 0.06, butanal 1.46± 0.16, pentanal 1.75 ±0.06, hexanal 1.83 ± 0.36, and heptanal 2.37 ±0.42. The proposed Arrhenius expressions arek₁ = (6.2 ± 7.5) × 10^–11 exp[–(2826 ± 866)/T] (cm³ molecule^–1s^–1),k₂ = (1.7 ± 1.0) × 10^–11 exp[–(2250 ± 192)/T] (cm³ molecule^–1s¹), k₃ =(7.6 ± 9.8) × 10¹¹ exp[–(2466 ± 505)/T] (cm³ molecule^–1s^–1),k₄ = (2.8 ± 1.4) × 10^–11 exp[–(2189 ± 156)/T] (cm³ molecule^–1s^–1), k₅ = (7.0 ± 1.8) ×10^–11 exp [–(2382 ± 998)/T](cm³ molecule^–1 s^–1), andk₆ = (7.8 ± 1.0) × 10^–11 exp[–(2406 ± 481)/T](cm³ molecule^–1 s^–1).Tropospheric lifetimes for these aldehydes werecalculated at night and during the day for typicalNO₃ and OH average concentrations and showed thatboth radicals provide an effective tropospheric sinkfor these compounds and that the night-time reactionwith the NO₃ radical can be an important, if notdominant, loss process for these emitted organics andfor NO₃ radicals.  相似文献   

Freshwater-saltwater interface and estuarine sediment in situ assays based on post-exposure feeding of chironomids and polychaetes     

Sara Soares  Susana Moreira  Sofia Andrade  Lúcia Guilhermino  Rui Ribeiro 《Estuaries and Coasts》2005,28(2):314-319

An integrated approach for ecological and ecotoxicological sediment assessments along the freshwater saltwater interface (FSI) and estuarine areas in general was developed, through the adaptation of recently proposed methods for the midge larvaChironomus riparius (an in situ assay based on post-exposure feeding for sediment toxicity assessments in freshwater systems) and the development of new techniques for the polychaeteHediste (Nereis) diversicolor (an in situ post-exposure feeding assay). Based on the previously proposed methods, improvements were made to the feeding quantification ofC. riparius fourth instar larvae. A method to quantify the post-exposure feeding ofH. diversicolor was developed and optimized under laboratory conditions using newly hatchedArtemia franciscana nauplii as a food source. Assay chambers and procedures fromC. riparius assays were easily adapted forH. diversicolor in situ exposures. Sediment assays using this integrated approach were successfully performed at an uncontaminated river-estuarine system. They consisted of a 48-h exposure followed by a 1-h post-exposure feeding for chironomids and a 2-h post-exposure feeding for polychaetes. Good recovery rates were obtained after the 48-h field exposure. Fluctuations in various physicochemical variables at the FSI, due to the tidal regime, did not significantly influenceC. riparius larval post-exposure feeding rates, suggesting that uncontaminated freshwater sites located upstream of FSI areas can be used as reference sites forC. riparius in situ evaluations in estuaries. Adapted assay chambers and procedures were suitable forH. diversicolor in situ exposures.  相似文献   

Fog precipitation on the Island of Madeira (Portugal)   总被引：2，自引：0，他引：2  

Susana Prada  Manuel da Silva 《Environmental Geology》2001,41(3-4):384-389

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Validation of a new endochronic liquefaction model for granular soil by using centrifuge test data   总被引：1，自引：0，他引：1  

Susana Lpez-Querol  Rafael Blzquez 《Soil Dynamics and Earthquake Engineering》2007,27(10):920-937

The application of a new liquefaction constitutive model, based on the endochronic theory applied to densification of sandy soil, to a set of centrifuge tests from the University of British Columbia, is presented in this paper. The model employed herein takes into account, in a unified formulation, contractive and dilative behaviours, and considers the soil collapse as well. First of all, the model is calibrated by means of undrained cyclic simple shear stress test data. The constitutive law of the soil is implemented in the bidimensional coupled finite element code CMLIQ (Cyclic Mobility and LIQuefaction), developed by the authors. Three centrifuge tests are analysed, the seismic loading and the geometry being the same for all of them, namely an improved slope with drain devices or denser soil at some locations. Comparisons between the data provided by the numerical model and the experimental measurements are shown, and, as a result, the accuracy of the model is explored and evaluated.  相似文献   

Characterizing proteases in an Antarctic Janthinobacterium sp. isolate：Evidence of a protease horizontal gene transfer event     

Cecilia Martinez-Rosales  Juan Jos Marizcurrena  Andrs Iriarte  Natalia Fullana  Hctor Musto  Susana Castro-Sowinski 《极地研究(英文版)》2015,(1)

We report the isolation of a cold-adapted bacterium belonging to the genus Janthinobacterium (named AU11), from a water sample collected in Lake Uruguay (King George Island, South Shetlands). AU11 (gro...  相似文献   

Tidal variations of some physico-chemical parameters in Blanca Bay,Argentina     

Marta Susana Orozco Storni  Rubén José Lara  Adán Edgardo Pucci 《Estuarine, Coastal and Shelf Science》1984,19(4):485-491

Oxygen, alkalinity, nutrients, pH, temperature and salinity were measured through tidal cycles in two points of Blanca Bay. A clear dependence of nutrients, oxygen and alkalinity with salinity and tide conditions was observed in the inner point, being attenuated in the outer one.  相似文献