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Université de Neuchâtel

Des formes d'humus au bois mort et du bois mort aux formes d'humus : contribution à l'étude des formes d'humus et des communautés lombriciennes en zone forestière subalpine, avec une emphase particulière sur le bois mort

Tatti, Dylan ; Gobat, Jean-Michel (Dir.) ; Le Bayon, Claire (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

Cette thèse s’inscrit dans une recherche plus vaste, le projet DecAlp. Celui-ci se déroule dans les Alpes italiennes (province de Trente) et est mené conjointement par de nombreux chercheurs. Il a pour principal objectif l’élaboration d’un modèle de décomposition et d’intégration du bois mort au sol. Cette thèse y occupe une place centrale en se concentrant sur les formes...

Université de Neuchâtel

The mate-seeking strategies of four braconid parasitoids (Hymenoptera: Braconidae)

Xu, Hao ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Parasitic wasps are widely used as biological control agents. To optimize their applications in agriculture, we need to understand how they locate hosts and mate. Parasitic wasps have about 50,000 described species, but less than 30 species have so far been tested in terms of their use of pheromones. In this thesis, I used a combination of bioassays, chemical analyses, and electrophysiological...

Université de Neuchâtel

Pyrrolizidine alkaloids : occurrence in bee products and impact on Honeybees ("Apis mellifera" L.)

Lucchetti, Matteo Angelo ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Pyrrolizidine alkaloids (PAs) are toxic plant secondary metabolites produced as defense against herbivores by a wide variety of plants, mainly of the Boraginaceae, Asteraceae and Fabaceae families. Consumption of products contaminated with PAs may lead to hepatotoxic, carcinogenic, genotoxic and teratogenic effects in animals and humans. PAs are mostly found in leaves, roots and seeds, and may...

Université de Neuchâtel

Impact of environment on co-evolution between hosts and parasites

Zeller, Michael ; Koella, Jacob (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

Many parasites cause pathology and mortality and can be a major source of selection on their hosts, creating strong selection pressures on the evolution of hosts defense strategies. Changes in the host’s tolerance and resistance to pathogen can strongly influence the spread of a disease and hence influence selection on virulence. Understanding how ecological conditions influence the host’s...

Université de Neuchâtel

Strategic social behaviour in wild vervet monkeys

Borgeaud, Christèle ; Bshary, Redouan (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

In comparison to other vertebrates, primates have a large brain in relation to their body size. It has been hypothesised that the degree of social complexity is the major predictor for such variation. In group living species, individuals face various social challenges which can include finding the right balance between cooperation and competition with other group members. Thus to survive and...

Université de Neuchâtel

Process based modeling of the karstification processes in the region of Tulum, Mexico

Maqueda, Axayacatl ; Renard, Philippe (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Caves are important since they are preferential paths for groundwater flow. Knowledge of caves or karst is essential for proper management of water resources, but the exploration of caves is a major challenge. An alternative to study caves and their structure is to simulate the processes related to cave growth. The motivation of this thesis is to study large karst networks in the region of...

Université de Neuchâtel

Chloroplast lipid droplet type II NAD(P)H oxidoreductase, NDC1, is essential for vitamin E and K1 metabolism

Eugeni Piller, Lucia ; Kessler, Felix (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Plant cells in different tissues contain specialized organelles belonging to the family of plastids. The chloroplast is the most prominent family member and responsible for photosynthesis in leaves. Most plastid types contain lipoprotein particles ("lipid droplets") termed plastoglobules. Little is known about plastoglobules that were long regarded as passive storage droplets. Indeed, the...

Université de Neuchâtel

Conjugacy growth series of groups

Mercier, Valentin ; Ciobanu, Laura I. (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

In this thesis we study the conjugacy growth series of several group constructions in terms of the standard and the conjugacy growth series of the building groups, with a specific generating set. This includes (1) groups of the form $G\wr L$ when $L$ admits a Cayley graph that is a tree, (2) graph products, (3) a specific free product of $\mathbb{Z}*\mathbb{Z}$ with amalgamation over...

Université de Neuchâtel

Random sampling with repulsion

Wilhelm, Matthieu ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

In this thesis, we explore the concept of repulsion and exploit it to develop new sampling designs. The first chapter is a review of the literature about sampling in finite population and consists of two distinct parts. In the first one, we suggest three principles as guidelines for designing a survey: randomization, overrepresentation and restriction. In the second part, we review the...

Université de Neuchâtel

L'industrie financière en transition : une approche territoriale et institutionnaliste des innovations financières

Salomon, Victoriya ; Crevoisier, Olivier (Dir.) ; Lucia, Maria Giuseppina (Codir.) ; Arnsperger, Christian (Codir.) ; Balsiger, Philipp (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Les causes et les conséquences de la crise financière globale de 2008 ont profondément marqué les esprits et ont impulsé une transition vers un nouvel ordre économique et financier. La reconfiguration du système financier en Suisse et la création de nouveaux circuits d’investissement, mieux articulés aux dynamiques économiques territoriales, constituaient l’hypothèse de départ de...