Search results for "Spatial"

Feeding ecology of the sand smelt, Atherina boyeri (Risso, 1810) (Osteichthyes, Atherinidae), in the western Mediterranean: evidence for spatial vari…

2005

The feeding ecology of the sand smelt Atherina boyeri Risso 1810 (Osteichthyes, Atherinidae) was investigated in a Mediterranean coastal basin (Stagnone di Marsala, Italy) by means of carbon and nitrogen stable isotope ratios. Sampling was carried out seasonally in 1999 in two locations characterised by different depth and vegetal coverage. Throughout the year the sand smelt showed enriched δ 13C and δ 15N values in both sampling locations (δ 13C about −12‰ and δ 15N about 12‰). This result suggests the overall importance of the benthic pathway in the food web leading to A. boyeri. Our isotopic picture is only in partial agreement with stomach content data from the literature. Stomach conte…

Particulate Organic Matter Composition in A Semi-Enclosed Marine System

2001

Spatial and temporal changes in the biochemical composition of particulate organic matter in a semi-enclosed marine system (Stagnone di Marsala, Mediterranean Sea) were studied, on a monthly basis, from January to December 1994, in order to assess nutritional value of suspended particles for benthic suspension feeders. According to previous findings, the study site displayed a strong oligotrophy. Chlorophyll-a accounted for a very low fraction of the total suspended matter pool (0.1%), whereas at least 75% of POC was of detrital/heterotrophic origin. POC: PON ratio values indicate that bacterioplankton biomass accounted for a significant fraction of the total POC pool, displaying values com…

Sources and transfer of organic matter in food webs of a Mediterranean coastal environment: Evidence for spatial variability

2006

Abstract The spatial variability in the food web structure of a Mediterranean semi-enclosed coastal environment (Stagnone di Marsala, Italy) was investigated using stable carbon and nitrogen isotopes. Organic matter sources and consumers were sampled in two locations with different environmental features (e.g. hydrodynamic regime, open-sea influence, vegetal coverage). Overall more 13 C-enriched and 15 N-depleted values were found in the central location than in the southern for organic matter sources and consumers. Pelagic consumers (zooplankton and juveniles of transient fish) showed slight spatial differences and in both locations seemed to depend on phytoplankton as the ultimate energy …

Exploitation of food sources by ichthyofauna in the Acquatina coastal system (Apulia, Italy)

2010

Unmanned aerial vehicle technology to assess the state of threatened biogenic formations: The vermetid reefs of mediterranean intertidal rocky coasts

2021

Abstract Vermetid bioconstructions are biogenic formations, built by sessile gastropod molluscs belonging to the family Vermetidae worldwide distributed, occurring in the intertidal and upper subtidal in the rocky shores. In the Mediterranean basin, they occur in complex and tridimensional structures that enhance the local biodiversity, allowing to qualify the structuring species as ecosystem engineers. Due to their ecological relevance and considerable extension along the coasts, we assessed their structural complexity using unmanned aerial vehicle (UAV) technology, as tool of littoral cartography analysis of these bioconstructions, and plaster hemispheres dissolution as a descriptor index…

Stable isotopes and trophic positions of littoral fishes from a Mediterranean Marine Protected Area

2008

Stable isotope analyses were employed to explore feeding and foraging habitats and trophic levels of littoral fishes in a western Mediterranean Marine Protected Area (Egadi Islands, Sicily, Italy). Carbon and nitrogen stable isotope ratios were measured in primary producers, invertebrates and fishes collected in December 2001 and January 2002. Fishes of the littoral region of the Egadi Islands had isotopic signatures that fell into a wider range for δ13C (about 6‰) than for δ15N (about 3‰). Carbon isotope ratios were consistent with a food web based on mixed sources and two trophic pathways leading to different fish species. Differences in the isotopic composition between islands were highe…

Can Wii ® remap far into near space?

2018

Background: healthy subjects show in the near space a slight attentional bias toward left (pseudoneglect) that shifts toward right when the task is performed in the far space. This bias moves back again to the left when the subject uses a tool, according to its ability to remap far into near space. On the other hand, when a laser pointer is used to this aim, no significant effects are observed as compared to no-tool condition. This phenomenon has been interpreted as due to the lack of tactile-proprioceptive feedback. Objective: the aim of the present study was to investigate if the use of an interactive tool without tactile- proprioceptive feedback, a three axis accelerometer that works wit…

A thermal inertia model for soil water content retrieval using thermal and multispectral images

2010

Soil moisture is difficult to quantify because of its high spatial variability. Consequently, great efforts have been undertaken by the research community to develop practical remote sensing approaches to estimate the spatial distribution of surface soil moisture over large areas and with high spatial detail. Many methodologies have been developed using remote sensing data acquiring information in different parts of the electromagnetic spectrum. Conventional field measurement techniques (including gravimetric and time-domain reflectometry) are point-based, involve on-site operators, are time expensive and, in any case, do not provide exhaustive information on the spatial distribution of soi…

Scarpa. Una cerniera spaziale per lo Steri

2018

Per un architetto pensare alla propria città, e un luogo specifico al suo interno, migliorarlo significa concentrarsi sulle qualità specifiche del sito da un punto di vista storico, economico, sociale e culturale. Questo scritto entrerà nei dettagli di questa riflessione, attraverso le esperienze di Carlo Scarpa e l'importante ruolo da lui assunto nella definizione dello Steri (1972-1978). Tutto ciò è diretto all'acquisizione della capacità di riconoscere la fisicità di un'architettura significativa e delle relazioni spaziali che la definiscono, come ad esempio quelle tra interno ed esterno, rendendo così il proprio concetto di soglia e di continuum spaziale. Siamo consapevoli che le scelte…

Scarpa in Sicily: The memory of our senses

2019

Per un architetto pensare alla propria città, a un luogo specifico e al suo interno da migliorare significa concentrarsi sulle qualità specifiche del sito da un punto di vista storico, economico, sociale e culturale. Questo scritto entrerà nei dettagli di questa riflessione, attraverso le esperienze di Carlo Scarpa e l'importante ruolo assunto da lui nella definizione di una possibile strategia innovativa già dalla mostra su Antonello da Messina del 1953. Il fare del maestro veneziano è volto all'acquisizione e alla capacità di riconoscere la fisicità di un'architettura significativa e le relazioni spaziali che la definiscono, come ad esempio quelle tra interno ed esterno, rendendo esplicit…