14 Gen. 2014 - Silvia Zaupa

Seminar Silvia Zaupa

Implementazione della Direttiva Quadro sulle Acque (2000/60/CE) attraverso l'utilizzo dei macroinvertebrati bentonici

Presenta: Silvia Zaupa, ( CNR - Istituto per lo Studio degli Ecosistemi, Verbania )

Nel progetto LIFE+InHabit, sono stati studiati 10 laghi, scelti tra bacini naturali e fortemente modificati (invasi), con diverso utilizzo idrico (idro-elettrico e potabile), situati in due diverse Regioni italiane (Piemonte e Sardegna). Verranno analizzate le relazioni tra fauna a macroinvertebrati e le variabili chimiche delle acque, dei sedimenti e granulometriche. Saranno illustrati i primi risultati riguardo le interazioni tra il macrobenthos e le alterazioni morfologiche, quantificate utilizzando il metodo Lake Habitat Survey. Inoltre verrà illustrato il nuovo indice per la valutazione della qualità dei corpi lacustri, basato sulla fauna a macroinvertebrati.

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3 Dic. 2013 - Mauro Gobbi

 

Seminar Mauro Gobbi

Ecologia delle geoforme alpine clima-dipendenti:
gli artropodi terrestri come strumento interpretativo

Presenta: Mauro Gobbi, ( MUSE – Museo delle Scienze, Trento )

Il ritiro dei ghiacciai, la loro trasformazione in ghiacciai neri e la fusione del permafrost stanno portando a grandi cambiamenti nella fisionomia del paesaggio alpino. Le aree di recente deglaciazione, i ghiacciai coperti da detrito e i rock glaciers, essendo geoforme clima-dipendenti, si stanno rivelando di estremo interesse ecologico e biogeografico. Gli artropodi terrestri sono tra le prime forme viventi che colonizzano questi ambienti e la letteratura recente mostra quanto le successioni primarie siano direzionali e deterministiche. Durante il seminario verranno presentate le dinamiche ecologiche alla base di ciascuna geoforma alpina ponendo attenzione alle strategie adattative che gli artropodi hanno adottato. Si affronterà, infine, l’ipotesi relativa la possibilità di considerare alcune geoforme come aree di rifugio, in questo periodo interglaciale, per le specie stenoterme fredde.

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12 Nov. 2013 - Luigi Vigliotti

 

Seminar Luigi Vigliotti

I sedimenti del lago Van: archivio climatico e ambientale degli ultimi 600.000 anni
(ICDP PALEOVAN)

Presenta: Luigi Vigliotti, ( CNR-Istituto di Scienze Marine – ISMAR Bologna )

International Continental Scientific Drilling Program (ICDP) drilled a complete 220 m long lacustrine sequence deposited during the last ~600,000 years in Lake Van, the fourth largest terminal lake in the world on a high plateau in eastern Anatolia, Turkey. The target was to investigate the paleoclimate history of a sensitive semi-arid region between the Black, Caspian, and Mediterranean seas. As a closed and saline lake, Lake Van react very sensitively to lake level changes caused by any alterations in the hydrological regime in response to climate change. The detrital signature of the sedimentary sequence, possibly of eolian origin, shows a lithologic variability that reflects changes in depositional conditions, including intervals characterized by anoxic conditions similar to the present-day. The lithological pattern, geochemical proxy records (TOC), elemental scanning (XRF) and even rock magnetic parameters matched the last six orbitally driven glacial/interglacial cycles as well as the sub-orbitally driven climate cycles observed in the Greenland ice-cores. A correlation is also observed with different climatic archives including the record of the dust flux from Antarctica (Epica) and the chinese loess. The unique setting of Lake Van, which records simultaneously the volcanic as well as the earthquake history, also allowed to establish possible coincidence between larger earthquakes and volcanic events.

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15 Ott. 2013 - Valeria Mezzanotte

Seminar Valeria Mezzanotte

Uso di microalghe come substrato per la produzione di biogas in impianti di depurazione

Presenta: Valeria Mezzanotte, ( Università degli Studi di Milano-Bicocca )

The seminar will focus on the results of an experimental study aiming at verifying the feasibility of including a photobioreactor within the sketch of a wastewater treatment plant, growing microalgae on the centrate from anaerobic sludge dewatering. The growth of algal biomass would take advantage of the available nitrogen and provide substrate for biogas production by anaerobic digestion. Tests have been carried out in semi-continuous by feeding a photobioreactor with a centrate/effluent blend and by increasing the fraction of centrate. The experimental results show that the centrate does not induce any toxicity and, on the contrary, can be well utilized by microalgae, whose average specific growth rate (µ), on centrate as such, was within 0.04 and 0.06 d-1. The maximum biomass concentration in the photobioreactor effluent was 1.6 gSS/L at 10 days HRT. Methane production tests lead to BMP values of 335±39, and 284±68 mL0°C, 1 atm CH4/g VS for the two tested samples, in agreement with literature values. Settling tests show that the settling capacity of microalgae, yet satisfactory, could be effectively improved after mixing with activated sludge, confirming the potential to use the existing primary settler for microalgae thickening in order to feed them to anaerobic digestion with primary/secondary sludge.

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1 Ott. 2013 - Roberta Bottarin

Seminar Roberta Bottarin

Temporal and longitudinal patterns of macro- and meiofauna in Rio Saldura

Presenta: Roberta Bottarin, ( EURAC Research ‐ Bolzano )

Mountain regions are proved to be particularly vulnerable to global change phenomena. The predicted temperature increase and summer precipitation decrease will likely lead to drier conditions in the Alps. The dry inner alpine Mazia Valley (South Tyrol, Italy) was chosen to study the eco-hydrological response of mountain ecosystems to climate change. Within several trans-disciplinary projects, experimental, monitoring and modeling activities have been combined. One of these studies focuses on the longitudinal and temporal patters of two biological communities (benthic marcofauna and hyporreic meiofauna) of Rio Saldura (BZ), the perennial glacier stream and tributary of the Adige River. Samples of have been integrated by chemico-physical analysis of surficial as well as interstitial waters in order to correlate community composition, diversity and environmental variables.

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