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Université de Fribourg

The rise of angiosperms pushed conifers to decline during global cooling

Condamine, Fabien L. ; Silvestro, Daniele ; Koppelhus, Eva B. ; Antonelli, Alexandre

In: Proceedings of the National Academy of Sciences, 2020, vol. 117, no. 46, p. 28867–28875

Competition among species and entire clades can impact species diversification and extinction, which can shape macroevolutionary patterns. The fossil record shows successive biotic turnovers such that a dominant group is replaced by another. One striking example involves the decline of gymnosperms and the rapid diversification and ecological dominance of angiosperms in the Cretaceous. It is...

Université de Fribourg

Shear stress-responsive polymersome nanoreactors inspired by the marine bioluminescence of dinoflagellates

Rifaie‐Graham, Omar ; Galensowske, Nikolas F. B. ; Dean, Charlie ; Pollard, Jonas ; Balog, Sandor ; Gouveia, Micael G. ; Chami, Mohamed ; Vian, Antoine ; Amstad, Esther ; Lattuada, Marco ; Bruns, Nico

In: Angewandte Chemie International Edition, 2020, vol. 60, no. 2, p. 904-909

Some marine plankton called dinoflagellates emit light in response to the movement of surrounding water, resulting in a phenomenon called milky seas or sea sparkle. The underlying concept, a shear-stress induced permeabilisation of biocatalytic reaction compartments, is transferred to polymer-based nanoreactors. Amphiphilic block copolymers that carry nucleobases in their hydrophobic block...

Université de Fribourg

A new species of the large-headed coastal marine turtle Solnhofia (Testudinata, Thalassochelydia) from the Late Jurassic of NW Switzerland

Anquetin, Jérémy ; Püntener, Christian

In: PeerJ, 2020, vol. 8, p. e9931

Background: The large-headed turtle Solnhofia parsonsi is known by a handful of specimens from the Late Jurassic of Germany and Switzerland (maybe also France). Solnhofia parsonsi is traditionally regarded as a “eurysternid” Thalassochelydia, a group of small to medium sized, mostly lagoonal or marginal turtles found almost exclusively in the Late Jurassic of Europe. More recently,...

Université de Fribourg

3D model related to the publication: A new species of the large-headed coastal marine turtle Solnhofia (Testudinata, Thalassochelydia) from the Late Jurassic of NW Switzerland

Anquetin, Jérémy ; Püntener, Christian

In: MorphoMuseuM, 2020, vol. 6, no. 4, p. e118

This contribution contains the 3D surface model of the holotype cranium of the Late Jurassic thalassochelydian turtle Solnhofia brachyrhyncha described and figured in the publication of Anquetin and Püntener (2020).

Université de Fribourg

Better roads, better off? : Evidence on improving roads in Tanzania

Dumas, Christelle ; Játiva, Ximena

(Working Papers SES ; 518)

Spatial isolation is considered as one of the main determinants of poverty. Therefore, many transport investments are undertaken with a stated objective of poverty reduction. In our paper, we evaluate a Tanzanian program that rehabilitated 2500km of major roads between 2008 and 2013. We deal with endogenous placement issues with a household fixed-effect strategy combined with a propensity score...

Université de Fribourg

Palynological study of carbonated mounds during the holocene along the atlantic and mediterranean moroccan margins

Rachid, Jihad ; Hssaida, Touria ; Hamoumi, Naima ; Terhzaz, Loubna ; Spezzaferri, Silvia ; Frank, Norbert ; Daghor, Lamia

In: Review of Palaeobotany and Palynology, 2020, vol. 278, p. 104213

A palynological study of carbonate mounds of Atlantic and Mediterranean Moroccan margins was conducted on sediment boxcores MD13-3441, MD13-3456, MD13-3461, MD13-3465, MD13-3468 collected during the oceanographic cruise MD 194/Eurofleet - GATEWAY, which took place on June 2013.The organic remaining revealed a dominance of dinoflagellate cysts over the continental fraction, which showed very...