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Université de Fribourg

Comparative analysis of the shape and size of the middle ear cavity of turtles reveals no correlation with habitat ecology

Foth, Christian ; Evers, Serjoscha W. ; Joyce, Walter G. ; Volpato, Virginie S. ; Benson, Roger B. J.

In: Journal of Anatomy, 2019, no. 0, p. -

The middle ear of turtles differs from other reptiles in being separated into two distinct compartments. Several ideas have been proposed as to why the middle ear is compartmentalized in turtles, most suggesting a relationship with underwater hearing. Extant turtle species span fully marine to strictly terrestrial habitats, and ecomorphological hypotheses of turtle hearing predict that this...

Université de Fribourg

Adaptation to developmental diet influences the response to selection on age at reproduction in the fruit fly

May, Christina M. ; Heuvel, Joost van den ; Doroszuk, Agnieszka ; Hoedjes, Katja M. ; Flatt, Thomas ; Zwaan, Bas J.

In: Journal of Evolutionary Biology, 2019, vol. 32, no. 5, p. 425–437

Experimental evolution (EE) is a powerful tool for addressing how environmental factors influence life‐history evolution. While in nature different selection pressures experienced across the lifespan shape life histories, EE studies typically apply selection pressures one at a time. Here, we assess the consequences of adaptation to three different developmental diets in combination with...

Université de Fribourg

The adaptive significance of chromosomal inversion polymorphisms in Drosophila melanogaster

Kapun, Martin ; Flatt, Thomas

In: Molecular Ecology, 2019, vol. 28, no. 6, p. 1263–1282

Chromosomal inversions, structural mutations that reverse a segment of a chromosome, cause suppression of recombination in the heterozygous state. Several studies have shown that inversion polymorphisms can form clines or fluctuate predictably in frequency over seasonal time spans. These observations prompted the hypothesis that chromosomal rearrangements might be subject to spatially and/or ...

Université de Fribourg

Comparing thyroid and insect hormone signaling

Flatt, Thomas ; Moroz, Leonid L. ; Tatar, Marc ; Heyland, Andreas

In: Integrative and Comparative Biology, 2006, vol. 46, no. 6, p. 777-794

Transitions between different states of development, physiology, and life history are typically mediated by hormones. In insects, metamorphosis and reproductive maturation are regulated by an interaction between the sesquiterpenoid juvenile hormone (JH) and the steroid 20-hydroxy-ecdysone (20E). In vertebrates and some marine invertebrates, the lipophilic thyroid hormones (THs) affect...

Bibliothèque cantonale jurassienne

Biomechanical investigations on the skulls of reptiles and mammals

Preuschoft, Holger ; Witzel, Ulrich

In: Senckenbergiana lethaea : wissenschaftliche Mitteilungen der Senckenbergischen Naturforschenden Gesellschaft, 2002, vol. 82, no. 1, p. 207-222

Université de Fribourg

The CAP protein superfamily: function in sterol export and fungal virulence

Schneiter, Roger ; Pietro, Antonio Di

In: BioMolecular Concepts, 2013, vol. 4, no. 5, p. 519-525

CAP superfamily proteins, also known as sperm-coating proteins, are found in all kingdoms of life and have been implicated in a variety of physiological contexts, including immune defense in plants and mammals, sperm maturation and fertilization, fungal virulence, and toxicity of insect and reptile venoms as well as prostate and brain cancer. CAP family members are mostly secreted...

Bibliothèque cantonale jurassienne

Cenomanian (Late Cretaceous) reptiles from northwestern Russell County, Kansas

Liggett, Gregory A.

In: Paleobios. Museum of Paleontology, Berkeley, 2005, vol. 25, no. 2, p. 9

Université de Fribourg

Combined rather than separate pathways for hedonic and sensory aspects of taste in fly larvae ?

Colomb, Julien ; Stocker, Reinhard F.

In: Fly, 2007, vol. 1, no. 4, p. 232 - 234

In mammals, the hedonic aspects (good versus bad) and sensory aspects (i.e., the molecular quality) of taste are associated with different brain regions. Anatomical data argue against such a separation in the primary taste center of Drosophila larvae. Is only one aspect of taste represented or do both co-exist at the same location? I present evidence for a hedonic representation in the larval...