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Université de Fribourg

Past climate‐driven range shifts and population genetic diversity in arctic plants

Pellissier, Loïc ; Eidesen, Pernille Bronken ; Ehrich, Dorothee ; Descombes, Patrice ; Schönswetter, Peter ; Tribsch, Andreas ; Westergaard, Kristine Bakke ; Alvarez, Nadir ; Guisan, Antoine ; Zimmermann, Niklaus E. ; Normand, Signe ; Vittoz, Pascal ; Luoto, Miska ; Damgaard, Christian ; Brochmann, Christian ; Wisz, Mary S. ; Alsos, Inger Greve

In: Journal of Biogeography, 2015, p. -

High intra-specific genetic diversity is necessary for species adaptation to novel environments under climate change, but species tracking suitable conditions are losing alleles through successive founder events during range shift. Here, we investigated the relationship between range shift since the Last Glacial Maximum (LGM) and extant population genetic diversity across multiple plant species...

Université de Fribourg

Dendritic subglacial drainage systems in cold glaciers formed by cut-and-closure processes

Naegeli, Kathrin ; Lovell, Harold ; Zemp, Michael ; Benn, Douglas I.

In: Geografiska Annaler: Series A, Physical Geography, 2014, vol. 96, no. 4, p. 591–608

The routing and storage of meltwater and the configuration of drainage systems in glaciers exert a profound influence on glacier behaviour. However, little is known about the hydrological systems of cold glaciers, which form a significant proportion of the total glacier population in the climate sensitive region of the High Arctic. Using glacio-speleological techniques, we obtained direct access...

Université de Fribourg

Sensory determinants of behavioral dynamics in Drosophila thermotaxis

Klein, Mason ; Afonso, Bruno ; Vonner, Ashley J. ; Hernandez-Nunez, Luis ; Berck, Matthew ; Tabone, Christopher J. ; Kane, Elizabeth A. ; Pieribone, Vincent A. ; Nitabach, Michael N. ; Cardona, Albert ; Zlatic, Marta ; Sprecher, Simon G. ; Gershow, Marc ; Garrity, Paul A. ; Samuel, Aravinthan D. T.

In: Proceedings of the National Academy of Sciences, 2014, vol. 112, no. 2, p. E220–E229

Complex animal behaviors are built from dynamical relationships between sensory inputs, neuronal activity, and motor outputs in patterns with strategic value. Connecting these patterns illuminates how nervous systems compute behavior. Here, we study Drosophila larva navigation up temperature gradients toward preferred temperatures (positive thermotaxis). By tracking the movements of animals...

Université de Fribourg

The length of the world’s glaciers – a new approach for the global calculation of center lines

Machguth, Horst ; Huss, Matthias

In: The Cryosphere, 2014, vol. 8, no. 5, p. 1741–1755

Glacier length is an important measure of glacier geometry. Nevertheless, global glacier inventories are mostly lacking length data. Only recently semi-automated approaches to measure glacier length have been developed and applied regionally. Here we present a first global assessment of glacier length using an automated method that relies on glacier surface slope, distance to the glacier margins...

Bibliothèque cantonale jurassienne

Dinosaur lactation ?

Else, Paul L.

In: Journal of experimental biology, 2013, vol. 216, p. 1-5