1,721,158 research outputs found
83. PISANO E., ROSSETTI S., VACCHI M., 1994. Karyotypic variability in the mediterranean rainbow wrasse Coris julis (Linneo, 1756).
No full textGEOGRAPHIC VARIABILITY OF THE MILLENNIAL SEA-LEVEL CHANGES ALONG THE COASTS OF ITALY
Full text linkThe large abundance of geological and archeological evidences of past sea-level stands have made the Italian coasts a major focus for the Mediterranean Sea-level science since the beginning of 20th century. We have populated an openaccess database including the postglacial relative sea-level (RSL) data available for the coasts of Italy. The creation of this database, produced following the most recent protocols of sea-level research, also allowed to evaluate the drivers that majorly controlled the variability of the Holocene (last 12 ka BP) sea-level histories along the Italian peninsula. Major subsidence trends (driven by tectonics and sediment compaction) characterize the coastal plains of the north-eastern Adriatic and northern Tuscany. Major uplift trends (often co-seismic) were found in NE Sicily and in the southernmost tip of Calabria. The most complex RSL evolution was observed in the Phlegrean fields volcanic district where, in the same area, we observed the juxtaposition of the highest relict of a mid-Holocene shoreline (more than 34 m above the present sea-level) and evidence of Roman buildings more than 8 m below present sea level. The comparison of the Italian sea-level with the geophysical models routinely used for the prediction of the RSL position through time yielded contrasting results. In particular, our analysis showed that caution should be used in paleogeographic reconstruction for periods older than 8.0 ka BP and only based on geophysical predictions. In fact, none of the models is able to reconcile the proxy-based RSL evolution in the Early Holocene period. This proposed database is an open repository and future production of new RSL data can be easily stored following the same scheme presented in this work
The occurence of Spheroides cutaneus (Gunther, 1870) (Pisces, Teraodontidae) in the mddle-west Mediterranean sea
No full textObservations sur la ditribution de Spheroides cutaneus (Gunther, 1870) (Pisces, Tetradontidae) en Mediterranee
No full textSea level rise scenarios in a changing climate. Learning from the past to predict the future
Full text linkGeological investigations of Holocene (last 12 ka) sea-level stands represent a crucial contribution to quantify any possible post-industrial (i.e., last 150 years) acceleration in sea-level rise and provide new constrains into the effects of on-going global change on the coastal areas. In particular, definition of both the pattern and the magnitude of the land vertical motions is controlled by the isostatic adjustment along the global coastlines. We present here the results of a number of recent studies that were carried out along the coast of north and south America and of the Mediterranean Sea. These data allowed quantifying the recent acceleration in sea-level rise and to define future scenarios of coastal inundation along the global coastlines
OPEN ACCESS DATA REPOSITORY OF LATE-PLEISTOCENE AND HOLOCENE PALEO-SHORELINES ALONG THE ANTARCTIC PENINSULA AND SOUTH SHETLAND ISLANDS COASTS
No full textZingaro M., Baroni C., Capolongo D., Mastro-nuZZi g., salvatore M.C., sCiCChitano g. & vaCChi M.,Open access data repository of Late-Pleistocene and Holocene paleo-shorelines along the Antarctic Peninsula and South Shetland Islands coasts. (IT ISSN 0391-9838, 2021).An improved understanding of the chronology of Antarctic ice sheet deglaciation since the Last Glacial Maximum (LGM) represents a fundamental tool to better define the origin of past and future meltwa-ter influx in the global oceans. Relict shorelines and other evidence of past Relative Sea Level (RSL) evolution were widely used to understand past ice sheet history and to improve predictions of climate-controlled sea level evolution. In the last decades, RSL data in the Antarctic region have been mostly produced using a wide range of geomorphic evidence such as beach and marine deposits, marine terraces and isolation ba-sins. However, the lack of a geographic common framework that in-cludes data derived from different sources, limits the accessibility to the information. Here we present a new cartographic approach to cre-ate an open access geodatabase of the postglacial paleo-shorelines by using a standard collecting pattern. Cartographic Antarctica Reposito-ry (CAR) includes RSL data along the coasts of the Antarctic Peninsula and South Shetland Islands. Results show the advantages to use CAR for integrating data and supporting spatial analyses, by representing an easy and usable tool for the improvement of shoreline evolution defini-tion and the planning of Antarctic coast investigations. CAR is dynam-ic repository project that will be further expanded on other Antarctic regions too, integrating fully into the wide reference context of the free access Antarctic datasets
Underwater geomorphology of the rocky coastal tracts between Finale Ligure and Vado Ligure (western Liguria, NW Mediterranean Sea)
No full textThe western part of the Liguria Region (NW Mediterranean Sea) has been reported as tectonically stable to slowly uplifting since the Late Pleistocene. Despite good knowledge of the coastal geomorphological features above sea level, very little information is available on the characteristics of the underwater coastlines. Direct and indirect underwater surveys carried out in the area between Vado Ligure and Finale Ligure (Western Liguria) allowed the identification of several surfaces of marine origin, in four sites, at three depth intervals: 8-13. m, 17-23. m and 27-30. m. These values appear to be in bathymetric analogy with those reported by other authors along the Italian coastlines, in areas where the tectonic movements along the Late Quaternary are considered negligible on the basis of the elevation of the MIS 5.5 shoreline. Although few chronological constraints are possible due to the lack of dateable material, the marine morphologies identified in this study constrain their ages to the Middle and Late Quaternary. © 2010 Elsevier Ltd and INQUA
Eustatic and Relative Sea Level Changes
No full textSea level changes can be driven by either variations in the masses or volume of the oceans, or by changes of the land with respect to the sea surface. In the first case, a sea level change is defined ‘eustatic’; otherwise, it is defined ‘relative’. Several techniques can be used to observe changes in sea level, from satellite data to tide gauges to geological or archeological proxies. Regardless of the technique used, ‘eustasy’ cannot be measured directly, but only calculated after perturbing factors of different origins are taken into account. In this paper, we review the meaning and main processes that contribute to eustatic and relative sea level changes, and we give an overview of the different techniques used to observe them
Assessing enigmatic boulder deposits in NE Aegean Sea: Importance of historical sources as tool to support hydrodynamic equations
Full text linkDue to their importance in the assessment of coastal hazards, several studies have focused on geomorphological and sedimentological field evidence of catastrophic wave impacts related to historical tsunami events. Among them, many authors used boulder fields as important indicators of past tsunamis, especially in the Mediterranean Sea. The aim of this study was to understand the mechanism of deposition of clusters of large boulders, consisting of beachrock slabs, which were found on the southern coasts of Lesvos Island (NE Aegean Sea). Methods to infer the origin of boulder deposits (tsunami vs. storm wave) are often based on hydrodynamic models even if different environmental complexities are difficult to be incorporated into numerical models. In this study, hydrodynamic equations did not provide unequivocal indication of the mechanism responsible for boulder deposition in the study area. Further analyses, ranging from geomorphologic to seismotectonic data, indicated a tsunami as the most likely cause of displacement of the boulders but still do not allow to totally exclude the extreme storm origin. Additional historical investigations (based on tsunami catalogues, historical photos and aged inhabitants interviews) indicated that the boulders are likely to have been deposited by the tsunami triggered by the 6.7 M s Chios-Karaburum earthquake of 1949 or, alternatively, by minor effects of the destructive tsunami produced by 1956's Amorgos Island earthquake. Results of this study point out that, at Mediterranean scale, to flank numerical models with the huge amount of the available historical data become a crucial tool in terms of prevention policies related to catastrophic coastal events. © 2012 Author(s). CC Attribution 3.0 License
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