13 feb. 2018 - Piermauro Giachino

20180213 Seminario Giachino

Una nuova emergenza fitosanitaria e ambientale in Italia settentrionale: il coleottero Popillia japonica.
Situazione attuale e prospettive future

Presenta: Piermauro Giachino

Regione Piemonte

Popillia japonica Newman, 1941 (Coleoptera: Scarabaeidae), specie considerata fortemente invasiva e di elevata criticità ambientale e agricola, viene segnata per la prima volta in Italia nel Comune di Turbigo (Mi) nel luglio 2014. A partire da quel momento questa specie ha espanso il proprio areale in modo continuativo seppure, al momento, ancora moderato. La comunicazione illustra gli interventi effettuati per contrastarne la diffusione sul territorio e arginare le possibilità di diffusione passiva con instaurazione di focolai secondari. Vengono illustrate le prospettive di lotta futura e la modulazione delle azioni da intraprendere per ottimizzare al massimo il rapporto costi/benefici nell'attività di contrasto.
Maggiori informazioni relative alla ricerca sono disponibili al seguente link

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06 feb. 2018 - Marco Isaia

20180206 Seminario Isaia

La conservazione dei ragni in Italia

Presenta: Marco Isaia

Università di Torino

Despite their ecological importance and their diversity spiders are still underrepresented in conservation policies and biology, especially compared to other invertebrate groups. We report a brief overview on spider conservation in Europe, including an outline on European Red Lists. We provide a particular focus on the conservation of spiders in Italy, with reference to the species cited by the international legislation (Macrothele calpeiana), the Italian regional legislation (Dolomedes plantarius and Argyroneta aquatica) and the IUCN Red List (D. plantarius, Hasarius adansoni, Vesubia jugorum and Pimoa delphinica). In view of the remarkable diversity of the Italian fauna, we conclude that the current conservation of spiders in Italy is largely inadequate.

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30 gen. 2018 - Lucia Guerra

20180109 Seminario Guerra

Paleoclimate changes recorded in the sediments of high-altitude shallow lakes from eastern Cordiellera, northwestern Argentina

Presenta: Lucia Guerra

University of Geneva, Earth Sciences Department, Limnogeology and Geomicrobiology Centro de Investigaciones en Ciencias de la Tierra

Lucia Guerra and her group have initiated a multiproxy study of sedimentary cores retrieved in high altitude (> 4000 m a.s.l.) shallow lakes (< 2 m water depth) located in different environments from the Eastern Cordillera to identify major sedimentological changes and to define their relationship to regional climate. Results from Laguna Salada Grande (23°S/65°W) a shallow lake located at 4102 m a.s.l with an endorheic basin, which has not been glaciated during the late Quaternary and from Laguna Leoneajo (22°S/65°W) located in a glacial valley at 4526 m a.s.l, is fed by rock glacial melting water with an exorheic basin, will be presented. Analyses of cores and outcrops (ongoing) include: petrophysical properties (magnetic susceptibility), focusing in XRF geochemistry, microstratigraphy, and detailed mineralogy along with a radiocarbon chronology. Lake records from glaciated and non-glaciated environments from Eastern Cordillera combined with former paleoclimatological records in the region (e.g. glacial deposits, lake transgressions) can supply critical information to understand the past patterns of atmospheric circulation in the central Andes region.

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23 gen. 2018 - Francesco Pomati

20180123 Seminario Pomati

Comprendere e prevedere le dinamiche del fitoplancton in un ambiente che cambia

Presenta: Francesco Pomati

EAWAG Zurigo, Svizzera

Prevedere le dinamiche di comunità complesse è una delle sfide centrali dell'ecologia, particolarmente in un periodo, come quello presente, di rapidi cambiamenti ambientali. In questo seminario il Dott. Pomati dimostrerà come dati di campo ad alta risoluzione, che permettono di studiare le interazioni fra gli organismi ed il loro ambiente in natura, permettono di valutare le prevedibilità del fitoplancton e di ricavare nuove informazioni su quali meccanismi governano le dinamiche di queste ricche e dinamiche comunità.

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16 gen. 2018 - Thomas Posch

20180116 Seminario Posch

When a lake stops deep water turnover with climate warming: Drastic consequences for primary producers

Presenta: Thomas Posch

Limnological Station, Department of Plant and Microbial Biology, University of Zurich, Kilchberg, Switzerland

After strong fertilization in the 20th century, many deep lakes in Central Europe are again nutrient poor due to long-lasting restoration (re-oligotrophication). In line with reduced phosphorus and nitrogen loadings, total organismic productivity decreased and lakes have now historically low nutrient and biomass concentrations. This caused speculations that restoration was overdone and intended fertilizations are needed to ensure ecological functionality. Here Thomas Posch will show that recent re-oligotrophication processes indeed accelerated, however caused by lake warming. Rising air temperatures strengthen thermal stabilization of water columns which prevents thorough turnover (holomixis). Reduced mixis impedes down-welling of oxygen rich epilimnetic (surface) and up-welling of phosphorus and nitrogen rich hypolimnetic (deep) water. However, nutrient inputs are essential for algal spring blooms acting as boost for annual food web successions. It is shown that repeated lack (since 1977) and complete stop (since 2013) of holomixis caused drastic epilimnetic phosphorus depletions and an absence of phytoplankton spring blooms in Lake Zurich (Switzerland). By simulating holomixis in experiments, Dr Posch and his group could induce significant vernal algal blooms, confirming that there would be sufficient hypolimnetic phosphorus which presently accumulates due to reduced export. Thus, intended fertilizations are highly questionable, as hypolimnetic nutrients will become available during future natural or artificial turnovers.

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