Search results for "Ephemera"
showing 10 items of 68 documents
Phytoplankton in extreme environments: importance and consequences of habitat permanency
2020
AbstractThere is hardly any sunshine exposed surface on this Earth, be it water or terrain, which would not support some biota. Still, many habitats offer harsh conditions requiring specialized physiological adaptations to survive. These environments are referred to as extremes; often inhabited by extremophilic organisms. In this review, characteristic species and assemblage properties of phytoplankton inhabiting extreme environments (especially lakes and pools where planktic life is potentially possible and independently of their origin) in terms of alkalinity, acidity, DOC, salinity, temperature, light and mixing regime will be outlined. Lakes characterized by more than a single extreme a…
Avisos y relaciones manuscritos y impresos sobre catastrofes naturales y sucesos prodigiosos en Sicilia durante el siglo XVIII
2021
In the eighteenth century there is a large number of stories, both handwritten and in print, that describe extraordinary and unlucky events of different kinds: monstrosities, eclipses, or storms, floods, earthquakes, eruptions, etc. These stories, with respect to Sicily, take the form of occasional printed news, although sometimes they may be included in serials organized by different criteria (topographic/chronological/subject). Surviving documents in archives and libraries offer some opportunities to deepen the study of issues concerning the circulation and dissemination of news about the same event, their credibility, their formal characters and content. Very rare printed ephemera and ha…
Islands of biogeodiversity in arid lands on a polygons map study: Detecting scale invariance patterns from natural resources maps.
2016
Many maps (geology, hydrology, soil, vegetation, etc.) are created to inventory natural resources. Each of these resources is mapped using a unique set of criteria, including scales and taxonomies. Past research indicates that comparing results of related maps (e.g., soil and geology maps) may aid in identifying mapping deficiencies. Therefore, this study was undertaken in Almeria Province, Spain to (i) compare the underlying map structures of soil and vegetation maps and (ii) investigate if a vegetation map can provide useful soil information that was not shown on a soil map. Soil and vegetation maps were imported into ArcGIS 10.1 for spatial analysis, and results then exported to Microsof…
L’apparato effimero allestito nella cattedrale di Palermo per le cerimonie funebri di Carlo III di Borbone (1789): storia e rappresentazione digitale
2022
The paper focus on the ephemeral apparatus realized by the architect Salvatore Attinelli on the occasion of the funeral of Charles III of Bourbon, to be set up inside the cathedral of Palermo, in those years affected by a total internal modernization based on the project commissioned in 1767 to Ferdinando Fuga. This apparatus, in an article published by the academic Giuseppina Leone in 2001, was considered an alternative project to the proposal of Ferdinando Fuga, considered expensive and with a language not responding to the rules of good and modern architecture. The purpose of this paper is to reinforce the hypothesis of an apparatus having design purposes, and to verify its feasibility t…
Biodiversità vegetale degli stagni temporanei della Sicilia
2009
Gli ambienti umidi effimeri ospitano comunità vegetali specializzate e sono sede esclusiva di rare microterofite nonché autentiche stazioni di rifugio per molte specie a ciclo effimero. Per l’interesse bio-ecologico, Braun-Blanquet ha definito queste fitocenosi un gioiello floristico. Anche la Comunità Europea, con la direttiva Habitat 92/43/CEE, riconosce agli stagni temporanei mediterranei una notevole importanza e li individua come habitat prioritario (3170*). Questi ambienti, essendo stagionali, di modesta estensione, spazialmente dispersi e difficilmente cartografabili, spesso vengono trascurati negli studi a scala di paesaggio. Tali habitat, invece, rappresentano veri e propri micro-h…
Ambienti umidi effimeri e naturalità del paesaggio in Sicilia
2009
I luoghi umidi temporanei sono ambienti acquatici che alternano periodicamente una fase d’invaso ed una fase secca ed ospitano espressive fitocenosi adattate a queste peculiari condizioni. Indagini condotte tra il 2003 ed il 2009 hanno consentito di individuare, in Sicilia, oltre 200 siti, costituiti generalmente da diverse pozze o piccoli stagni. L’estrema fragilità di questi habitat li rende molto vulnerabili a qualunque tipo di alterazione ambientale e pertanto risultano essere indicatori molto sensibili della pressione antropica sul territorio. Infatti, la conservazione di questi biotopi non può prescindere da una corretta gestione del contesto territoriale che li circonda. Il presente …
Similitudine nelle caratteristiche morfologiche dei rill e degli ephemeral gully
2008
La festa barocca a Palermo : città, architetture, istituzioni
2006
La festa barocca a Palermo costituisce l’alter ego effimero e occasionale del processo di monumentalizzazione, graduale e complesso, della città: entrambi obbediscono alle stesse esigenze di ufficialità e magnificenza, da soddisfare obbligatoriamente nell’ottica di una città capitale. L’autorevole regista delle grandi manifestazioni ufficiali è il Senato palermitano, al quale come massima istituzione della città è affidata in genere la responsabilità sia dell’organizzazione materiale, sia dell’elaborazione culturale del programma celebrativo, in particolare della festa annuale in onore di S. Rosalia.In Palermo the baroque festival is the ephemeral and occasional alter ego of monumentalisati…
Variabilidad espacial de los cambios de cauce en una rambla mediterránea en las seis últimas décadas (1946-2006)
2014
An analysis of morphological changes during the last six decades is presented for the Rambla de Cervera, a Mediterranean ephemeral stream located in the eastern sector of the Iberian Mountain Range. The studied channel (16.5 km) has two contrasted sectors: a horst confined sector (5.5 km) and a graben sector (11 km). Channel changes were analysed through the analysis of aerial photographs, with geographical information systems (GIS) and comparison of topographic surveys made with a GPS-RTK. Between 1946 and 2006 the Rambla de Cervera, underwent channel adjustments comparable to those observed in other Mediterranean rivers. The gravel channel markedly narrowed, losing width (68.5%) and chann…
Multiregression Analysis of the Kinetic Constants in Ephemeral Rivers: The Case Study of the Oreto River
2018
Profuse efforts have been committed to develop efficient tools to measure the ecological status of the receiving water body quality state. The recurrence to mathematical models as support tools for the receiving water body quality assessment can be an optimal choice. Indeed, mathematical models can allow to build-up the cause effect relationship between polluting sources and receiving water quality. Regarding the river water quality modelling, two different kinds of river can be single out: large and small rivers. In the modelling approach, the main differences between the two types of river are reflected in the model kinetic constants. Indeed, the main quality processes which control and g…