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Université de Fribourg

Formation and taphonomy of human footprints in microbial mats of present-day tidal-flat environments: implications for the study of fossil footprints

Marty, Daniel ; Strasser, André ; Meyer, Christian A.

In: Ichnos, 2009, vol. 16, no. 1-2, p. 127 - 142

his study concerns the formation, taphonomy, and preservation of human footprints in microbial mats of present-day tidal-flat environments. Due to differences in water content and nature of the microbial mats and the underlying sediment, a wide range of footprint morphologies was produced by the same trackmaker. Most true tracks are subjected to modification due to taphonomic processes, leading...

Université de Fribourg

Reed bunting females increase fitness through extra-pair mating with genetically dissimilar males

Suter, Stefan M. ; Keiser, Martin ; Feignoux, Raoul ; Meyer, Dietrich R.

In: Proceedings of the Royal Society B: Biological Sciences, 2007, vol. 274, no. 1627, p. 2865-2871

Females of many socially monogamous species accept or even actively seek copulations outside the social pair bond. As females cannot increase the number of offspring with promiscuous behaviour, the question arises why they engage in extra-pair mating. We used microsatellite data to determine paternity, heterozygosity and genetic relatedness in the reed bunting (Emberiza schoeniclus), a...

Université de Fribourg

The functional costs and benefits of dietary restriction in Drosophila

Burger, Joep M. S. ; Hwangbo, Dae Sung ; Corby-Harris, Vanessa ; Promislow, Daniel E. L.

In: Aging Cell, 2007, vol. 6, no. 1, p. 63–71.

Dietary restriction (DR) extends lifespan in an impressively wide array of species spanning three eukaryotic kingdoms. In sharp contrast, relatively little is known about the effects of DR on functional senescence, with most of the work having been done on mice and rats. Here we used Drosophila melanogaster to test the assumption that lifespan extension through DR slows down age-related...

Université de Fribourg

Variation in phenology, growth, and wood anatomy of Toona sinensis and Toona ciliata in relation to different environmental conditions

Heinrich, Ingo ; Banks, John Charles Gripper

In: International Journal of Plant Sciences, 2006, vol. 167, no. 4, p. 831-841

Tree-ring proxy data from subtropical to tropical Australasia are valuable though rare sources for climate reconstructions. Toona sinensis (A. Juss.) M. Roem. and Toona ciliata M. Roem. occurring naturally in this region are among the most promising tree species for future tree-ring research. However, little is known about their phenological behaviors and the influence of...