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Université de Neuchâtel

Le tourisme face aux changements climatiques : comment articuler une démarche de durabilité ? : Le cas des Alpes Vaudoises et de la stratégie « Alpes Vaudoises 2020 »

Bruni, Morgane Cécile ; Rebetez, Martine (Dir.)

Mémoire de master : Université de Neuchâtel, 2018.

La démarche Alpes Vaudoises 2020 vise à solutionner l’apparition pour le tourisme « d’enjeux spécifiques » liés au réchauffement climatique. Les stations de ski de moyenne altitude sont particulièrement concernées par la réduction de l’enneigement. Or, la transition vers un tourisme moins dépendant de la neige est au centre de politiques publiques fédérales et...

Université de Fribourg

Molecular ecology studies of species radiations: current research gaps, opportunities and challenges

la Harpe, Marylaure de ; Paris, Margot ; Karger, Dirk N. ; Rolland, Jonathan ; Kessler, Michael ; Salamin, Nicolas ; Lexer, Christian

In: Molecular Ecology, 2017, p. -

Understanding the drivers and limits of species radiations is a crucial goal of evolutionary genetics and molecular ecology, yet research on this topic has been hampered by the notorious difficulty of connecting micro- and macroevolutionary approaches to studying the drivers of diversification. To chart the current research gaps, opportunities and challenges of molecular ecology approaches to...

Université de Fribourg

Sino-Himalayan mountains act as cradles of diversity and immigration centres in the diversification of parrotbills (Paradoxornithidae)

Liu, Yang ; Hu, Junhua ; Li, Shou-Hsien ; Duchen, Pablo ; Wegmann, Daniel ; Schweizer, Manuel

In: Journal of Biogeography, 2016, vol. 43, no. 8, p. 1488–1501

Aim: Montane regions like the Sino-Himalayas constitute global diversity hotspots. Various mechanisms such as in situ adaptive divergence, speciation following immigration or allopatric diversification in complex landscapes have been proposed to account for the exceptional diversity found in a particular clade in a montane setting. We investigated macroevolutionary patterns to test these...

Université de Fribourg

Is hybridization driving the evolution of climatic niche in Alyssum montanum

Arrigo, Nils ; La Harpe, Marylaure de ; Litsios, Glenn ; Zozomová-Lihová, Judita ; Španiel, Stanislav ; Marhold, Karol ; Barker, Michael S. ; Alvarez, Nadir

In: American Journal of Botany, 2016, p. -

PREMISE OF THE STUDY: After decades of interest, the contribution of hybridization to ecological diversification remains unclear. Hybridization is a potent source of novelty, but nascent hybrid lineages must overcome reproductive and ecological competition from their parental species. Here, we assess whether hybrid speciation is advantageous over alternative modes of speciation, by comparing...

Université de Fribourg

Dynamic optimal capital growth of diversified investment

Yonga, Luo ; Bo, Zhu ; Yong, Tang

In: Journal of Applied Statistics, 2015, vol. 42, no. 3, p. 577–588

We investigate the problem of dynamic optimal capital growth of diversified investment. A general framework that the trader maximize the expected log utility of long-term growth rate of initial wealth was developed. We show that the trader's fortune will exceed any fixed bound when the fraction is chosen less than critical value. But, if the fraction is larger than that value, ruin is almost...

Université de Fribourg

‘Next generation’ biogeography: towards understanding the drivers of species diversification and persistence

Lexer, Christian ; Mangili, Sofia ; Bossolini, Eligio ; Forest, Felix ; Stölting, Kai N. ; Pearman, Peter B. ; Zimmermann, Niklaus E. ; Salamin, Nicolas

In: Journal of Biogeography, 2013, p. -

The drivers of species diversification and persistence are of great interest to current biogeography, especially in those global biodiversity ‘hotspots’ harbouring most of Earth's animal and plant life. Classical multispecies biogeographical work has yielded fascinating insights into broad-scale patterns of diversification, and DNA-based intraspecific phylogeographical studies have started to...

Université de Neuchâtel

Why do leafcutter bees cut leaves? New insights into the early evolution of bees

Litman, Jessica R. ; Danforth, Bryan N. ; Eardley, Connal D. ; Praz, Christophe J.

In: Proceedings of the Royal Society B, 2011, vol. 278, no. 1724, p. 3593-3600

Stark contrasts in clade species diversity are reported across the tree of life and are especially conspicuous when observed in closely related lineages. The explanation for such disparity has often been attributed to the evolution of key innovations that facilitate colonization of new ecological niches. The factors underlying diversification in bees remain poorly explored. Bees are thought to...

Université de Neuchâtel

Inferring reciprocal evolutionary histories in associated species of plants and insects in two european pollination systems

Espíndola, María Anahí ; Alvarez, Nadir (Dir.) ; Rahier, Martine (Codir.) ; Carstens, Bryan C. (Codir.) ; Després, Laurence (Codir.) ; Gibernau, Marc (Codir.) ; Gugerli, Felix (Codir.) ; Küpfer, Philippe (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

Coevolution is defined as reciprocal evolutionary changes that might arise at any spatiotemporal scale. Despite every organism on Earth undergoes coevolutionary interactions, cases of one-to-one specific relationships are generally rare. However, because of the reduced number of interacting species they concern, these species-specific associations are interesting to evolutionary biologists...