Physiological response to high temperature in the Tropical Eastern Pacific coral Pocillopora verrucosa          下载免费PDF全文

Alma P. Rodríguez‐Troncoso  Eugenio Carpizo‐Ituarte  Amílcar L. Cupul‐Magaña 《Marine Ecology》2016,37(5):1168-1175

The ecological and economic values of coral reef communities have encouraged efforts to implement periodic visual survey programs to secure their conservation. To date, visual monitoring‐based approaches have detected bleaching events weeks or months after the initial onset. An evaluation of the stress response of coral colonies, as well as their ability to resist and recover from the stress events, may increase our understanding of the physiological processes underling the stress and/or acclimation responses. Coral bleaching events, caused primarily by abnormally high temperatures, are continuously affecting coral communities worldwide. To evaluate the stress and recovery responses of the reef‐building coral Pocillopora verrucosa, a laboratory study was conducted herein. Coral nubbins were exposed to high temperatures to induce bleaching, and their ability to resist and recover from bleaching was subsequently monitored after returning the corals to ambient temperature. Lipid and chlorophyll concentrations, as well as Symbiodinium spp. density, decreased in samples exposed to nearly 31°C, slowly recovering to near‐control levels upon return to non‐stressful conditions. The present data set allows for an assessment of the vulnerability and ability of this common species to resist sub‐optimal environmental conditions, particularly the thermal stress events that will occur more commonly in their habitats as global seawater temperatures continue to rise.  相似文献   

goGPS: open-source MATLAB software     

Herrera  Antonio M.  Suhandri  Hendy F.  Realini  Eugenio  Reguzzoni  Mirko  de Lacy  M. Clara 《GPS Solutions》2016,20(3):595-603

GPS Solutions - goGPS is a positioning software application designed to process single-frequency code and phase observations for absolute or relative positioning. Published under a free and...  相似文献   

The Chan Hol cave near Tulum (Quintana Roo,Mexico): evidence for long‐lasting human presence during the early to middle Holocene          下载免费PDF全文

Fabio Hering  Wolfgang Stinnesbeck  Jens Folmeister  Eberhard Frey  Sarah Stinnesbeck  Jerónimo Avilés  Eugenio Aceves Núñez  Arturo González  Alejandro Terrazas Mata  Martha Elena Benavente  Carmen Rojas  Adriana Velázquez Morlet  Norbert Frank  Patrick Zell  Julia Becker 《第四纪科学杂志》2018,33(4):444-454

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Daily scale modelling of aquifer–river connectivity in the urban alluvial aquifer in Langreo, Spain     

Pedro Martínez-Santos  Pedro E. Martínez-Alfaro  Eugenio Sanz  Angel Galindo 《Hydrogeology Journal》2010,18(6):1525-1537

Evaluating aquifer–river interactions is naturally complex, particularly within urban settings. This is largely due to the difficulties involved in quantifying most elements of the water balance. The ability of numerical models to deal with several dynamic variables simultaneously makes them valuable tools to address this kind of problem. An applied, modeling-based approach to investigate the spatial and temporal variations of aquifer–river connectivity within a shallow urban aquifer is presented. Model development is based on comprehensive field campaigns in Langreo, Spain. Two calibration runs (for summer and winter conditions) were carried out in order to evaluate the spatial distribution of recharge rates. The model suggests that baseflows are largely negligible in comparison with total streamflows. This is mostly attributed to the abrupt nature of the catchment, which prevents the existence of sufficiently large alluvial systems to a great extent. Modelling results also show that aquifer–river connectivity at the study site is constrained by urban pumping as well as by seasonal fluctuations.  相似文献   

Using Argo data to investigate the Meridional Overturning Circulation in the North Atlantic     

Alonso Hernández-Guerra  Terrence M. Joyce  Eugenio Fraile-Nuez  Pedro Vélez-Belchí 《Deep Sea Research Part I: Oceanographic Research Papers》2010,57(1):29-36

Using a variety of oceanographic data, including direct volume transports in the Florida Strait, and Argo float profiles and drift velocities at 24°N and 36°N in the North Atlantic, inverse calculations are presented in which the net meridional transport, down to a depth of approximately 1600 m, is estimated at both latitudes for a 5-year period 2003–2007. The upper ocean is divided into seven layers using neutral density, and mass conservation constraints have been applied to a closed box bounded by these latitudes, including the Florida Strait. Ekman layer transports have been included in the top-most layer, and the inverse calculation has solved for changes from the initial reference velocities, Ekman and Florida Strait transports, given a priori estimates on the accuracy of each of these quantities. Solutions with and without transformations due to Mediterranean Water (MW) formation are made. Our results indicate that (1) time-averaged transport estimates derived from Argo have significant less eddy noise than individual hydrographic sections, (2) Argo drift velocities provide information to the inverse solution for the ocean interior, and (3) comparison of the total integrated interior mass transports in the thermocline waters for the period 2003–2007 with the previous estimates based on trans-ocean hydrographic sections shows that, within the errors of our estimation, the upper limb of the Atlantic Meridional Overturning Circulation has not significantly changed since 1957.  相似文献   

Comparison of Integrated Geodetic Data Models and Satellite Radar Interferograms to Infer Magma Storage During the 1991–1993 Mt. Etna Eruption     

Alessandro?BonaccorsoEmail author  Eugenio?Sansosti  Paolo?Berardino 《Pure and Applied Geophysics》2004,161(7):1345-1357

We compare the results obtained from the modelling of EDM, GPS, levelling and tilt data measured in the first part of the 1991–1993 eruption at Etna to the InSAR data acquired during the second part. The geodetic changes are very marked in the first half of the eruption and constrain a deflation source located at a few kilometers of depth ( 3 km b.s.l.), in agreement with other independent geophysical evidence. SAR data, available during the second part of the eruption, were analysed for different time intervals in the second part of the eruption. The interpretation of SAR interferograms reveals a large-scale but less marked deflation of the volcano that could be caused by a deeper source. This second source is in accord with a second deeper anomaly revealed by recent seismic investigations. The combination of geodetic data modelling and SAR images suggests a complex plumbing system composed at least of two possible storage regions located at different depths.  相似文献   

Mapping Soils,Vegetation, and Landforms: An Integrative Physical Geography Field Experience*   总被引：2，自引：0，他引：2  

Joseph P. Hupy  Stephen P. Aldrich  Randall J. Schaetzl  Pariwate Varnakovida  Eugenio Y. Arima  Juliegh R. Bookout  Narumon Wiangwang  Annalie L. Campos  Kevin P. McKnight 《The Professional geographer》2005,57(3):438-451

Students in a graduate seminar at Michigan State University produced a series of detailed vegetation, soils, and landform maps of a 1.5‐square‐mile (3.9 km²) study area in southwest Lower Michigan. The learning outcomes (maps) and skill development objectives (sampling strategies and various GIS applications) of this field‐intensive mapping experience were driven by the assumption that students learn and understand relationships among physical landscape variables better by mapping them than they would in a classroom‐based experience. The group‐based, problem‐solving format was also intended to foster collaboration and camaraderie. The study area lies within a complex, interlobate moraine. Fieldwork involved mapping in groups of two or three, as well as soil and vegetation sampling. Spatial data products assembled and used in the project included topographic maps, a digital elevation model (DEM), aerial photographs, and NRCS (National Resource Conservation Service) soil maps. Most of the soils are dry and sandy, with the main differentiating characteristic being the amount of, and depth to, subsurface clay bands (lamellae) or gravelly zones. The presettlement (early 1830s) vegetation of the area was oak forest, oak savanna, and black oak “barrens.” Upland sites currently support closed forests of white, black, and red oak, with a red maple, dogwood, and sassafras understory. Ecological data suggest that these oak forests will, barring major disturbance, become increasingly dominated by red maple. This group‐based, problem‐solving approach to physical geography education has several advantages over traditional classroom‐based teaching and could also be successfully applied in other, field‐related disciplines.  相似文献   

Plate kinematics of the Western Mediterranean region during the Oligocene and Early Miocene     

Antonio Schettino  Eugenio Turco 《Geophysical Journal International》2006,166(3):1398-1423

The tectonic history of the Western Mediterranean region during the Oligocene and Early Miocene is illustrated through a series of plate reconstructions, from chron C13n to chron C6n. The reconstructions are based on a new interpretation of published magnetic anomaly data and two-ships seismic data, and their integration with known geological constraints, in order to determine style and timing of the backarc extension processes in the Liguro-Provençal, Valencia and Algerian basins. In particular, a reinterpretation of the regional magnetic anomaly field allowed the calculation of the instantaneous Euler poles associated with the motion of 11 microplates relative to Eurasia and Iberia. Furthermore, a quantitative analysis of the acoustic basement morphology and the balancing of deep crustal profiles were used to estimate the closure and pre-rift rotation angles associated with the Euler poles of opening of the Ligurian, Provençal, Valencia and Algerian basins. This rigorous reconstruction of the geometry of the pre-rift continental margins of Iberia and Eurasia could furnish important insights into the study of Mediterranean tectonics for older times.  相似文献   

W3(OH)区域H2O脉泽的快速时变     

徐烨  郑兴武  张福俊  俞志尧  韩溥 《中国天文和天体物理学报》2000,20(2)

通过对 Ｗ３（ＯＨ）区域 ２２ ＧＨz Ｈ_(２)Ｏ脉泽源的短时间跟踪观测,探测到速度为-５２．８ ｋｍ／ｓ子谱的流量密度呈线性下降趋势,变化时标约为 １９天．同时也观测到了整个脉 泽源的谱线宽度与该子谱的强度之间的相关变化．这些现象可能是由脉泽云之间的相 互碰撞导致脉泽抽运率的变化所引起的。  相似文献   

Continuous magma recharge at Mt. Etna during the 2011–2013 period controls the style of volcanic activity and compositions of erupted lavas     

Marco Viccaro  Rosario Calcagno  Ileana Garozzo  Marisa Giuffrida  Eugenio Nicotra 《Mineralogy and Petrology》2015,109(1):67-83

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