Impact of vehicles on benthic macrofauna on a subtropical sand beach     

Fabio Cavalca Bom  Leonir André Colling 《Marine Ecology》2020,41(4):e12595

Our study aimed to identify possible relationships between the structure of the benthic macrofauna and the intense use of vehicles in Cassino Beach. Physical changes in the sediment were identified, with high compaction in the sector most affected by the vehicles, especially during the summer. The benthic macrofauna was significantly affected by vehicles, with lower densities observed in the most impacted sector, mainly in the summer, unlike the control sector, where higher densities were observed during the pre-summer and summer. We concluded that the vehicle traffic changes the physical environment of the beach and consequently affects the benthic community in the face of this disturbance. We conclude that the benthic macrofauna is highly impacted by vehicle traffic at Cassino Beach, mainly in the period with the highest traffic, and alternatives are needed for this impact, helping to recover this ecosystem.  相似文献   

Reproducing the assembly of massive galaxies within the hierarchical cosmogony     

Fabio Fontanot  Pierluigi Monaco  Laura Silva  Andrea Grazian 《Monthly notices of the Royal Astronomical Society》2007,382(2):903-914

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Simulations of gaseous disc-embedded planet interaction     

Graeme Lufkin †  Thomas Quinn  James Wadsley  Joachim Stadel  Fabio Governato 《Monthly notices of the Royal Astronomical Society》2004,347(2):421-429

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Intermittency of magnetic turbulence in slow solar wind     

Vincenzo Carbone  Roberto Bruno  Fabio Lepreti 《Planetary and Space Science》2004,52(10):953-956

We investigate the properties of intermittency of magnetic turbulence by using magnetic field data collected by the Helios spacecraft in the inner heliosphere. Clear scaling laws for magnetic structure functions are visible in periods where the velocity of the bulk plasma is low. Within these periods we found that intermittency of magnetic turbulence is high with respect to velocity field. A comparison with fluid flows where passive scalars are more intermittent than velocity, yields to consider the magnetic field like a “passive vector”.  相似文献   

Apparent magnetic polarity reversals due to remagnetization resulting from late diagenetic growth of greigite from siderite     

Leonardo Sagnotti  rew P. Roberts  Richard Weaver  Kenneth L. Verosub  Fabio Florindo  Christopher R. Pike  Trevor Clayton  Gary S. Wilson 《Geophysical Journal International》2005,160(1):89-100

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Stable inverse deconvolution of magnetic data     

Fabio Caratori Tontini 《Geophysical Journal International》2005,162(3):725-735

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Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)     

Leonardo Sagnotti  Aldo Winkler  Laura Alfonsi  Fabio Florindo  Fabrizio Marra 《Earth and Planetary Science Letters》2000,180(3-4):243-257

We report on new paleomagnetic results obtained from 27 sites sampled in the Plio–Pleistocene sequences at the external front of the central–northern Apennines. Previous analyses of Miocene (Messinian) sediments indicated that the present shape of the northern Apenninic arc is due to the oroclinal bending of an originally straight belt oriented around N320° and that vertical axis rotations accompanied the migration of the thrust fronts toward the Adriatic foreland [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153–3166]. We tried to provide new paleomagnetic constraints for the timing and rates of the oroclinal bending process during the Pliocene and the Pleistocene. The results suggest that CCW rotations observed in the northern part of the studied area are possibly younger than 3 Ma. No regional rotation is recorded in the Pliocene and Pleistocene sediments from the southern part of the study area, analogously to the Messinian sediments of the ‘Acquasanta’ domain of Speranza et al. [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153–3166]. A local significant CCW rotation (23°±10°) is identified in the Early Pleistocene sediments that crop out along the Adriatic coast between Ascoli and Pescara, indicating differential motion of the thrust sheets. This rotation must be younger than 1.43 Ma.  相似文献   

A generalized Biot–Gassmann model for the acoustic properties of shaley sandstones¹     

José M. Carcione  Boris Gurevich  Fabio Cavallini 《Geophysical Prospecting》2000,48(3):539-557

We obtain the wave velocities of clay-bearing sandstones as a function of clay content, porosity and frequency. Unlike previous theories, based simply on slowness and/or moduli averaging or two-phase models, we use a Biot-type three-phase theory that considers the existence of two solids (sand grains and clay particles) and a fluid. The theory, which is consistent with the critical porosity concept, uses three free parameters that determine the dependence of the dry-rock moduli of the sand and clay matrices as a function of porosity and clay content.
Testing of the model with laboratory data shows good agreement between predictions and measurements. In addition to a rock physics model that can be useful for petrophysical interpretation of wave velocities obtained from well logs and surface seismic data, the model provides the differential equation for computing synthetic seismograms in inhomogeneous media, from the seismic to the ultrasonic frequency bands.  相似文献   

Neglectella glomerata sp. nov., a new species and implications for the systematics of the genus Neglectella (Oocystaceae,Trebouxiophyceae, Chlorophyta)     

Liu  Xudong  Zhang  Ran  Feng  Jia  Rindi  Fabio  Xie  Shulian 《中国海洋湖沼学报》2021,39(6):2370-2379

Journal of Oceanology and Limnology - The genus Neglectella Vodenicarov & Benderliev has a morphology similar to the well-known genus Oocystis, except for the numerous chloroplasts stacked...  相似文献   

Soil moisture-temperature feedbacks at meso-scale during summer heat waves over Western Europe     

Marc Stéfanon  Philippe Drobinski  Fabio D’Andrea  Cindy Lebeaupin-Brossier  Sophie Bastin 《Climate Dynamics》2014,42(5-6):1309-1324

This paper investigates the impact of soil moisture-temperature feedback during heatwaves occurring over France between 1989 and 2008. Two simulations of the weather research and forecasting regional model have been analysed, with two different land-surface models. One resolves the hydrology and is able to simulate summer dryness, while the other prescribes constant and high soil moisture and hence no soil moisture deficit. The sensitivity analysis conducted for all heatwave episodes highlights different soil moisture-temperature responses (1) over low-elevation plains, (2) over mountains and (3) over coastal regions. In the plains, soil moisture deficit induces less evapotranspiration and higher sensible heat flux. This has the effect of heating the planetary boundary layer and at the same time of creating a general condition of higher convective instability and a slight increase of shallow cloud cover. A positive feedback is created which increases the temperature anomaly during the heatwaves. In mountainous regions, enhanced heat fluxes over dry soil reinforce upslope winds producing strong vertical motion over the mountain slope, first triggered by thermal convection. This, jointly to the instability conditions, favors convection triggering and produces clouds and precipitation over the mountains, reducing the temperature anomaly. In coastal regions, dry soil enhances land/sea thermal contrast, strengthening sea-breeze circulation and moist cold marine air advection. This damps the magnitude of the heatwave temperature anomaly in coastal areas, expecially near the Mediterranean coast. Hence, along with heating in the plains, soil dryness can also have a significant cooling effect over mountains and coastal regions due to meso-scale circulations.  相似文献