159 research outputs found

    Circular Bedforms Due to Pit Foraging of Greater Flamingo Phoenicopterus roseus in a Back-barrier Intertidal Habitat

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    The Greater Flamingo Phoenicopterus roseus is known as an ecosystem engineer, rearranging sediment in peculiar bedforms as a consequence of its filter-feeding behaviour. In recent decades, the populations of the Greater Flamingo have notably increased, and now the species is one of the most abundant waterbirds in Mediterranean wetlands. Owing to its range expansion, it inhabits and exploits new and suitable foraging sites detectable by foraging structures left on the sediment. There are few images of the foraging morphologies in the literature, possibly due to their ephemeral nature and difficulty in detecting them. In this manuscript, we present a very detailed UAV (Unmanned Aerial Vehicle) image of an aggregate of pit foraging structures of Greater Flamingo discovered on a back-barrier washover fan in the Marano and Grado Lagoon (Northern Adriatic, Italy)

    Plataforma de inovação agrária de Moçambique - informações geoespaciais para a gestão dos recursos naturais e desenvolvimento agrícola.

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    O projeto Embrapa?Moçambique é baseado nas similaridades edafoclimáticas existentes entre as savanas moçambicanas e o Cerrado brasileiro e objetiva o levantamento e o mapeamento das potencialidades dos recursos naturais de Moçambique. Neste trabalho, foi gerado um mosaico digital de Moçambique a partir de imagens do satélite Landsat 8, do ano de 2013, e foram estabelecidos critérios para: a definição das órbitas-ponto; o processamento digital das imagens; o estabelecimento de um layout; a sobreposição de planos de informações de interesse para os grupos de pesquisa brasileiro e moçambicano, como localização de parques, reservas, rios principais; entre outros. Como resultado alcançado, destaca-se a geração e disponibilização do mosaico digital composto por 49 cenas, que dará apoio para a análise preliminar, em ambiente de sistemas de informação geográfica, para o levantamento de uso e cobertura das terras de Moçambique

    Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) since the Last Glacial Maximum

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    The continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated. The aim of this study is to increase the knowledge of the last glacial/deglacial dynamics in the Central Basin slope–basin system using a multidisciplinary approach, including integrated sedimentological, micropaleontological and tephrochronological information. The analyses carried out on three box cores highlighted sedimentary sequences characterised by tree stratigraphic units. Collected sediments represent a time interval from 24 ka Before Present (BP) to the present time. Grain size clustering and data on the sortable silt component, together with diatom, silicoflagellate and foraminifera assemblages indicate the influence of the ice shelf calving zone (Unit 1, 24–17 ka BP), progressive receding due to Circumpolar Deep Water inflow (Unit 2, 17–10.2 ka BP) and (Unit 3, 10.2 ka BP–present) the establishment of seasonal sea ice with a strengthening of bottom currents. The dominant and persistent process is a sedimentation controlled by contour currents, which tend to modulate intensity in time and space. A primary volcanic ash layer dated back at around 22 ka BP is correlated with the explosive activity of Mount Rittmann

    Multidisciplinary assessment and prediction tools addressing coastal vulnerability to erosion and sea level rise. Lesson learnt from the RITMARE Project

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    Natural processes and human activities are strongly connected, and sometimes con icting, in the evolution of coastal and transitional environments. The strong anthropic pressure on coastal regions, together with the e ects of a changing climate, demands nowadays more pressingly for e cient tools to characterise and predict the behaviour of such systems in order to de ne appropriate response strategies. This requires a deep understanding of the connections among di erent drivers and di erent scales, a multidisciplinary challenge in which heterogeneous data, approaches and scales need to be framed within a consistent dynamical description. To this aim, a speci c research line was dedicated to \u201cCoastal Vulnerability to Erosion and Sea Level Rise\u201d within the RITMARE Project, supported by the Italian Ministry of University and Research with the purpose of integrating the Italian Marine community in shared research elds in the period 2012-2017. The activities carried out in this framework have been moving along interconnected branches tackling the themes related with sea level rise, ocean modelling, and geomorphological assessment in present conditions and in di erent climate change scenarios, with an eye on the exploitation of marine sand as a strategic resource. In this contribution we review the main outcomes of this multidisciplinary and coordinated research. Besides discussing the advances and the possibilities from state-of-the art technologies and methodologies, we point out that a coordinated use of the described tools should be promoted in the design of survey and monitoring activities, as well as in the exploitation of already collected data. Expected outcomes of this strategy include the implementation of improved policies and infrastructures for coastal protection, anked by reliable short-term forecasting systems and e cient rapid response protocols, in the framework of an integrated coastal planning at the multi-decadal scale

    Neuromatch Academy: a 3-week, online summer school in computational neuroscience

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    Bocca lagunare di S.Andrea

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    Spiagge. Dinamica, occupazione, difesa e .... creativit\ue0.

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    Il litorale italiano \ue8 oggi investito da processi di trasformazione territoriale le cui premesse e gli esiti sono spesso oggetto di discussione, in quanto riconducibili ad interpretazioni che banalizzano la condivisa lettura del sistema di costa come motore dello sviluppo e della competitivit\ue0 locale. Le citt\ue0 a vocazione balneare si caratterizzano come punti di osservazione privilegiati, dai quali registrare le contraddizioni che emergono in relazione a tali derive di signifi cato: non ultima, la compromissione della qualit\ue0 degli spazi dello stare collettivo che - segnando il limite tra natura e artificio \u2013 costituiscono tradizionalmente proprio i luoghi della riconoscibilit\ue0 e della attrattivit\ue0 in termini turistici. Ponendosi come complessificazione di un ragionamento gi\ue0 avviato (Mazzotta, Pujatti, a cura di, Vistamare, Alinea, Firenze 2009), l\u2019esperienza didattica descritta nel volume va oltre il tema della riqualificazione del waterfront come motore di rigenerazione urbana e si spinge a \u201cvivere il pericolo\u201d tra i flutti: in un momento in cui il costruire sul mare appare una strategia criticabile - in quanto spesso frequentato progettualmente soprattutto allo scopo di trasferire sull\u2019acqua cubatura edificatoria irrecepibile dal saturo urbanizzato di costa - le prefigurazioni proposte a riguardo del molo come segno morfogenetico intendono porsi, anche provocatoriamente, come strategie alternative agli scenari che prevedono il proliferare sulle nostre coste di nuove marine, porti turistici, isole artificiali, nei termini di segni imposti pi\uf9 che dialoganti con l\u2019identit\ue0 del contesto. Lignano Sabbiadoro, storicamente paesaggio costruito la cui immagine caratterizzante \ue8 rintracciabile anche nei moli e nelle rotonde sul mare, assume il ruolo di ideale laboratorio, sia in relazione alla sua posizione geografica che alle caratteristiche del contesto ambientale e storico-culturale - per attualizzare il significato di pleasure pier nei termini di infrastruttura per la accessibilit\ue0 turistica e contemporaneamente di spazio aperto \u201cabitabile\u201d - che trae l\u2019accezione di sostenibile dal porsi come schema insediativo modellato anche attraverso l\u2019uso di materiali e tecniche, nei termini di strumenti per interpretare in modo coerente le relazioni con il milieu di riferimento
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