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Université de Fribourg

Microfossils, a key to unravel cold-water carbonate mound evolution through time: Evidence from the eastern alboran sea

Stalder, Claudio ; Vertino, Agostina ; Rosso, Antonietta ; Rüggeberg, Andres ; Pirkenseer, Claudius ; Spangenberg, Jorge E. ; Spezzaferri, Silvia ; Camozzi, Osvaldo ; Rappo, Sacha ; Hajdas, Irka

In: PLoS ONE, 2015, vol. 10, no. 10, p. e0140223

Cold-water coral (CWC) ecosystems occur worldwide and play a major role in the ocean's carbonate budget and atmospheric CO2 balance since the Danian (~65 m.y. ago). However their temporal and spatial evolution against climatic and oceanographic variability is still unclear. For the first time, we combine the main macrofaunal components of a sediment core from a CWC mound of the Melilla Mounds...

Université de Fribourg

Fossil and genetic evidence for the polyphyletic nature of the planktonic foraminifera ‘Globigerinoides’, and description of the new genus Trilobatus

Spezzaferri, Silvia ; Kucera, Michal ; Pearson, Paul Nicholas ; Wade, Bridget Susan ; Rappo, Sacha ; Poole, Christopher Robert ; Morard, Raphaël ; Stalder, Claudio

In: PLoS ONE, 2015, vol. 10, no. 5, p. e0128108

Planktonic foraminifera are one of the most abundant and diverse protists in the oceans. Their utility as paleo proxies requires rigorous taxonomy and comparison with living and genetically related counterparts. We merge genetic and fossil evidence of “Globigerinoides”, characterized by supplementary apertures on spiral side, in a new approach to trace their “total evidence phylogeny”...

Université de Fribourg

Late Weichselian deglaciation and early Holocene development of a cold-water coral reef along the Lopphavet shelf (Northern Norway) recorded by benthic foraminifera and ostracoda

Stalder, Claudio ; Spezzaferri, Silvia ; Rüggeberg, Andres ; Pirkenseer, Claudius ; Gennari, Giordana

In: Deep Sea Research Part II: Topical Studies in Oceanography, 2014, vol. 99, p. 249–269

Cold-water coral (CWC) settlement in northern Norway is strongly related to the outlet-glaciers of the Fennoscandian Ice-sheet, and dating of known CWC structures show clearly post-glacial ages. Two gravity cores (POS391 559/2,277 cm long and POS391 559/3,282 cm long) were recovered on a CWC reef in the area of Lopphavet, northern Norway. Detailed investigations on lithology (sediment structures...

Université de Fribourg

Internal pore measurements on macroperforate planktonic Foraminifera as an alternative morphometric approach

Constandache, Monica ; Yerly, Florence ; Spezzaferri, Silvia

In: Swiss Journal of Geosciences, 2013, vol. 106, no. 2, p. 179–186

Because of the lack of genetic control on extinct species, the morphologic approach remains the only way of identifying fossil Foraminifera. In addition to comparative description of gross shell morphology, morphometry became more important in recent years and was extended to encompass the ultrastructure of the shells. In particular, some studies focused on porosity, as determined by the pore...

Université de Fribourg

The Helgoland Experiment – assessing the influence of methodologies on Recent benthic foraminiferal assemblage composition

Schönfeld, Joachim ; Golikova, Elena ; Korsun, Sergei ; Spezzaferri, Silvia

In: Journal of Micropalaeontology, 2013, vol. 32, no. 2, p. 161–182

The aim of the present study was to compare preservation, staining and preparation techniques to assess the influence of different sample treatments and analyses on the accuracy of benthic foraminiferal assemblage data from NE Atlantic shelf seas. Replicate surface samples from the SE North Sea were preserved with ethanol–rose Bengal or formalin, some were stained after processing, or...

Université de Fribourg

Sedimentary sources of the mud-breccia and mud volcanic activity in the Western Alboran Basin

Gennari, Giordana ; Spezzaferri, Silvia ; Comas, M.C. ; Rüggeberg, A. ; Lopez-Rodriguez, C. ; Pinheiro, L.M.

In: Marine Geology, 2013, vol. 339, p. 83–95

During the TTR-17 Leg 1 cruise in the West Alboran Basin, gravity cores were acquired from three mud volcanoes (MVs): Dhaka, Carmen and the recently discovered Maya. This paper presents micropaleontological and radiocarbon dating results from the three mud volcanoes, using cores containing mud breccias overlain by and interbedded with hemipelagic sediments. At Dhaka MV, the mud-breccia matrix...

Université de Fribourg

Benthic foraminifer assemblages from norwegian cold-Water coral reefs

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

In: Journal of Foraminiferal Research, 2013, vol. 43, no. 1, p. 21-39

Quantitative investigations on the total (living + dead) benthic foraminiferal assemblages were performed on 32 surface-sediment samples (0–2 cm, .63-mm size fraction) from water depths ranging from 110–600 m (‘‘on-reef’’) to .2000 m (‘‘off-reef’’) in the Oslo Fjord (Skagerrak Basin), the mid-Norwegian slope (Sula, Røst, and Trænadjupet reefs), and the northern coral-reef...

Université de Fribourg

Neritic isotope and sedimentary records of the Eocene–Oligocene greenhouse–icehouse transition: The Calcare di Nago Formation (northern Italy) in a global context

Jaramillo-Vogel, David ; Strasser, André ; Frijia, Gianluca ; Spezzaferri, Silvia

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2012, p. -

From the Middle Eocene to Early Oligocene, the Earth experienced the most significant climatic cooling of the Cenozoic era. The Eocene–Oligocene transition (EOT) represents the culmination of this climatic cooling, leading to the onset of the Antarctic glaciation and, consequently, to the beginning of the present-day icehouse world. Whereas the response of deep-sea systems to this climate...

Université de Fribourg

The FOBIMO (FOraminiferal BIo-MOnitoring) initiative—Towards a standardised protocol for soft-bottom benthic foraminiferal monitoring studies

Schönfeld, Joachim ; Alve, Elisabeth ; Geslin, Emmanuelle ; Jorissen, Frans ; Korsun, Sergei ; Spezzaferri, Silvia

In: Marine Micropaleontology, 2012, vol. 94-95, p. 1-13

The European Community Marine Strategy Framework Directive (MSFD) was established to provide guidelines for monitoring the quality of marine ecosystems. Monitoring the status of marine environments is traditionally based on macrofauna surveys, for which standardised methods have been established. Benthic foraminifera are also good indicators of environmental status because of their fast turnover...