Cnr-Istituto di Scienze Marine

L’Istituto di Scienze Marine del Consiglio Nazionale delle Ricerche svolge attività di ricerca fondamentale e applicata in oceanografia fisica, chimica e biologica e in geologia marina.

L’obiettivo è contribuire allo studio dei processi oceanici e della variabilità climatica, allo sviluppo di sistemi/servizi per l’osservazione, la protezione e la gestione sostenibile dell’ambiente marino e delle coste.

                               L’Istituto di Scienze Marine del Consiglio Nazionale delle Ricerche (CNR-ISMAR) svolge attività di

Ricerca Fondamentale e Applicata

in oceanografia fisica, chimica e biologica e in geologia marina con l’obiettivo di contribuire sia allo studio dei processi oceanici e della variabilità climatica che allo sviluppo di sistemi/servizi per l’osservazione, la protezione e la gestione sostenibile dell’ambiente marino e delle coste

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Dati presto disponibili

Understanding causation via correlations and linear response theory

In spite of the common-wisdom statement correlation does not imply causation, a proper employ of correlations and of fluctuation-response theory allows us to understand the causal relations between the variables of a Markov process.
The fluctuation-response formalism can be used to find the direct causal links between the variables of a system and to introduce a degree of causation.
Although for generic nonlinear dynamics there is no simple exact relationship between correlations and response functions, the protocol can still give a useful proxy also in the presence of weak nonlinear terms.

Collegamento WEBEX:

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In allegato la locandina del Seminario
Il gruppo seminari CNR-ISMAR, Alessandra Conversi (Lerici), Filomena Loreto (Bologna), Gianluigi Liberti (Roma) e Camilla Palmiotto (Bologna).

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Mesocarnivore community structuring in the presence of Africa’s apex predator

Apex predator reintroductions have proliferated across southern Africa, yet their ecological effects and proposed umbrella benefits of associated management lack empirical evaluations. Despite a rich theory on top-down ecosystem regulation via mesopredator suppression, a knowledge gap exists relating to the influence of lions (Panthera leo) over Africa’s diverse mesocarnivore (less than 20 kg) communities. We investigate how geographical variation in mesocarnivore community richness and occupancy across South African reserves is associated with the presence of lions. An interesting duality emerged: lion reserves held more mesocarnivore-rich communities, yet mesocarnivore occupancy rates and evenness-weighted diversity were lower in the presence of lions. Human population density in the reserve surroundings had a similarly ubiquitous negative effect on mesocarnivore occupancy. The positive association between species richness and lion presence corroborated the umbrella species concept but translated into small differences in community size. Distributional contractions of mesocarnivore species within lion reserves, and potentially corresponding numerical reductions, suggest within-community mesopredator suppression by lions, probably as a result of lethal encounters and responses to a landscape of fear. Our findings offer empirical support for the theoretical understanding of processes underpinning carnivore community assembly and are of conservation relevance under current large-predator orientated management and conservation paradigms.

https://royalsocietypublishing.org/doi/abs/10.1098/rspb.2020.2379

The paper has been discussed by The New York Times:

https://www.nytimes.com/2021/03/13/science/lions-south-africa-wildlife-parks.html?s=08#click=https://t.co/O5STTSL0OZ

Next seminar

23 Jan. 2025, time: 14:30

Dr. Francesco Chierici (Istituto di Radioastronomia, IRA-INAF)
Monitoring slow uplift and subsidence in shallow seafloor environments using bottom pressure measurements

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