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Université de Fribourg

SEM study of black, blue, violet and yellow inglaze colours of the oldest Swiss tin‐opacified stove tiles (c .1450– c .1512, canton Bern)*

Maggetti, Marino

In: Archaeometry, 2020, p. arcm.12638

The ceramic colours of eight late medieval to early Renaissance stove tiles were studied by scanning electron microscopy‐backscattered electron (SEM‐BSE) images and SEM with energy‐dispersive spectroscopy (SEM‐EDS). Microstructural observations and chemical compositions of these colours give some insight into the colouring agents and techniques used by the potters. All decorations...

Université de Fribourg

Application of the Socio-Economic Impact Classification for Alien Taxa (SEICAT) to a global assessment of alien bird impacts

Evans, Thomas ; Blackburn, Tim M. ; Jeschke, Jonathan M. ; Probert, Anna F. ; Bacher, Sven

In: NeoBiota, 2020, vol. 62, p. 123–142

We use a recently proposed framework, the Socio-Economic Impact Classification for Alien Taxa (SEICAT) to undertake the first global assessment of the impacts of alien birds on human well-being. A review of the published literature and online resources was undertaken to collate information on the reported socio-economic impacts of 415 bird species with self-sustaining alien populations...

Université de Fribourg

Birds have peramorphic skulls, too: anatomical network analyses reveal oppositional heterochronies in avian skull evolution

Plateau, Olivia ; Foth, Christian

In: Communications Biology, 2020, vol. 3, no. 1, p. 195

In contrast to the vast majority of reptiles, the skulls of adult crown birds are characterized by a high degree of integration due to bone fusion, e.g., an ontogenetic event generating a net reduction in the number of bones. To understand this process in an evolutionary context, we investigate postnatal ontogenetic changes in the skulls of crown bird and non-avian theropods using anatomical...

Université de Fribourg

Modularity of the neck in birds (Aves)

Terray, Léa ; Plateau, Olivia ; Abourachid, Anick ; Böhmer, Christine ; Delapré, Arnaud ; la Bernardie, Xavier de ; Cornette, Raphaël

In: Evolutionary Biology, 2020, p. -

The neck connects the head and the trunk and is the key structure allowing all movements of the head. The neck morphology of birds is the most variable among living tetrapods, including significant differences in the number and shape of the cervical vertebrae. Despite these differences, according to the literature, three morphofunctional regions (i.e., modules) have been identified along the...

Université de Fribourg

Review of emerging japanese encephalitis virus: new aspects and concepts about entry into the brain and inter-cellular spreading

Filgueira, Luis ; Lannes, Nils

In: Pathogens, 2019, vol. 8, no. 3, p. 111

Japanese encephalitis virus (JEV) is an emerging flavivirus of the Asia-Pacific region. More than two billion people live in endemic or epidemic areas and are at risk of infection. Recently, the first autochthonous human case was recorded in Africa, and infected birds have been found in Europe. JEV may spread even further to other continents. The first section of this review covers...

Université de Fribourg

Hormonal modulation of larval begging and growth in the burying beetle Nicrophorus vespilloides

Crook, Tara C. ; Flatt, Thomas ; Smiseth, Per T.

In: Animal behaviour, 2008, vol. 75, no. 1, p. 71-77

Recent studies on birds show that two steroid hormones, testosterone and corticosterone, stimulate nestling begging and growth. Here, we seek to investigate whether juvenile hormone, a major regulatory insect hormone, has similar effects on larval begging and growth in insects. To this end, we experimentally elevated larval juvenile hormone levels by topical application of methoprene, a potent...