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Université de Fribourg

Origin and age of carbonate clasts from the Lusi eruption, Java, Indonesia

Samankassou, Elias ; Mazzini, Adriano ; Chiaradia, Massimo ; Spezzaferri, Silvia ; Moscariello, Andrea ; Couto, Damien Do

In: Marine and Petroleum Geology, 2018, vol. 90, p. 138–148

Deep stratigraphic constrains below the Indonesian Lusi mud eruption are currently lacking due to the absence of deep wells and good quality seismic data. A collection of carbonate clasts has been sampled from the Lusi site, active since its birth in 2006. These specimens are part of a large variety of lithotypes erupted from the main crater. The carbonates analysed comprise scleractinian...

Université de Fribourg

Impact of industrial phosphate waste discharge on the marine environment in the Gulf of Gabes (Tunisia)

Kateb, Akram El ; Stalder, Claudio ; Rüggeberg, Andres ; Neururer, Christoph ; Spangenberg, Jorge E. ; Spezzaferri, Silvia

In: PLOS ONE, 2018, vol. 13, no. 5, p. e0197731

The marine environment in the Gulf of Gabes (southern Tunisia) is severely impacted by phosphate industries. Nowadays, three localities, Sfax, Skhira and Gabes produce phosphoric acid along the coasts of this Gulf and generate a large amount of phosphogypsum as a waste product. The Gabes phosphate industry is the major cause of pollution in the Gulf because most of the waste is directly...

Université de Fribourg

In situ observations of foraminiferal bleaching in the maldives, indian ocean

Spezzaferri, Silvia ; El Kateb, Akram ; Pisapia, Chiara ; Hallock, Pamela

In: Journal of Foraminiferal Research, 2018, vol. 48, no. 1, p. 75–84

Coral reefs are threatened worldwide by a variety of natural and human-induced stressors; anomalous temperatures are presently among the most serious threats by causing extensive coral bleaching. Amphistegina spp. exhibit similar bleaching as corals in the presence of photo-oxidative stress induced by either light or temperature, especially during times of maximum solar irradiance. At 11...

Université de Fribourg

Growth and demise of a Paleogene isolated carbonate platform of the Offshore Indus Basin, Pakistan : effects of regional and local controlling factors

Shahzad, Khurram ; Betzler, Christian ; Ahmed, Nadeem ; Qayyum, Farrukh ; Spezzaferri, Silvia ; Qadir, Anwar

In: International Journal of Earth Sciences, 2018, vol. 107, p. 481-504

Based on high-resolution seismic and well datasets, this paper examines the evolution and drowning history of a Paleocene–Eocene carbonate platform in the Offshore Indus Basin of Pakistan. This study uses the internal seismic architecture, well log data as well as the microfauna to reconstruct factors that governed the carbonate platform growth and demise. Carbonates dominated by larger benthic...

Université de Fribourg

Developing Foram-AMBI for biomonitoring in the Mediterranean: Species assignments to ecological categories

Jorissen, Frans ; Nardelli, Maria Pia ; Almogi-Labin, Ahuva ; Barras, Christine ; Bergamin, Luisa ; Bicchia, Erica ; El Kateb, Akram ; Ferraro, Luciana ; Gann, Mary Mc ; Morigi, Caterina ; Romano, Elena ; Sabbatini, Anna ; Schweizer, Magali ; Spezzaferri, Silvia

In: Marine Micropaleontology, 2018, vol. 140, p. 33–45

Most environmental bio-monitoring methods using the species composition of marine faunas define the Ecological Quality Status of soft bottom ecosystems based on the relative proportions of species assigned to a limited number of ecological categories. In this study we analyse the distribution patterns of benthic foraminifera in the Mediterranean as a function of organic carbon gradients on...

Université de Fribourg

Assessing coral reef health in the North Ari Atoll (Maldives) using the FoRAM Index

Pisapia, C. ; Kateb, Akram El ; Hallock, P. ; Spezzaferri, Silvia

In: Marine Micropaleontology, 2017, vol. 133, no. Supplement C, p. 50–57

Tropical marine ecosystems are richly diverse, but are experiencing growing pressure from coastal development and tourism. Assessing the status of coral reef communities along gradients of human pressure is necessary to predict recovery capacity of reefs exposed to acute events such as mass bleaching or storm destruction. Islands in the central Maldives Archipelago, which experience three...

Université de Fribourg

Stable isotope study of a new chondrichthyan fauna (Kimmeridgian, Porrentruy, Swiss Jura): an unusual freshwater-influenced isotopic composition for the hybodont shark Asteracanthus

Leuzinger, Léa ; Kocsis, L. ; Billon-Bruyat, Jean-Paul ; Spezzaferri, Silvia ; Vennemann, T.

In: Biogeosciences, 2016, vol. 12, no. 23, p. 6945–6954

Chondrichthyan teeth (sharks, rays, and chimaeras) are mineralized in isotopic equilibrium with the surrounding water, and parameters such as water temperature and salinity can be inferred from the oxygen isotopic composition (δ18Op) of their bioapatite. We analysed a new chondrichthyan assemblage, as well as teeth from bony fish (Pycnodontiformes). All specimens are from Kimmeridgian coastal...

Université de Fribourg

Schackoinella Spina, a new benthic foraminiferal species from cold-water coral ecosystems of the alboran sea and the gulf of Cádiz

Stalder, Claudio ; Székely-Szabolcs, Flavius ; Kateb, Akram El ; Rooij, David Van ; Spezzaferri, Silvia

In: The Journal of Foraminiferal Research, 2015, vol. 45, no. 4, p. 344–353

Schackoinella spina n. sp. has been found in the eastern Alboran Sea at five different stations in water depths ranging from 258–330 m, as well as in one 532 m deep station in the Gulf of Cádiz, north-eastern Atlantic Ocean. Three stations have been sampled with a giant box core (BC) and two stations with a gravity core (GC) system. The sediments of the BCs and the GCs are characterized by...

Université de Fribourg

Taxonomic notes and illustrations of benthicforaminifera from cold-water coral ecosystems

Spezzaferri, Silvia ; Rüggeberg, Andres ; Stalder, Claudio ; Margreth, Stephan

In: Atlas of benthic foraminifera from cold-water coral reefs - Special Publication / Cushman Foundation For Foraminiferal Research, 2014, vol. 44, p. 49-140