In: Journal of Zoological Systematics and Evolutionary Research, 2019, vol. 57, no. 1, p. 179–190
Capoeta is a herbivorous cyprinid fish genus, widely distributed in water bodies of Western Asia. Recent species show a distinct biogeographic pattern with endemic distribution in large fluvial drainage basins. As other cyprinids, the species of this genus are characterized by the presence of the pharyngeal bone with pharyngeal teeth. Despite this, the detailed morphology of the pharyngeal...
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In: Ecology and Evolution, 2014, vol. 4, no. 14, p. 2867–2883
Specialization to nectarivory is associated with radiations within different bird groups, including parrots. One of them, the Australasian lories, were shown to be unexpectedly species rich. Their shift to nectarivory may have created an ecological opportunity promoting species proliferation. Several morphological specializations of the feeding tract to nectarivory have been described for...
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In: Basic and Applied Ecology, 2009, vol. 10, no. 8, p. 754-762
Across large spatial scales, species richness in many taxa is mainly determined by climatic variables. However, some of the mechanisms behind large-scale patterns of species richness and abundance are expected to act on the community level, and on a smaller scale than the resolution of the data commonly used for deriving these patterns. We studied the distribution of sheetweb spiders (Araneae:...
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In: Polar Biology, 2009, vol. 32, no. 9, p. 1275-1286
The ivory gull, a rare high-Arctic species whose main habitat throughout the year is sea ice, is currently listed in Greenland as ‘Vulnerable’, and as ‘Endangered’ in Canada, where the population declined by 80% in 20 years. Despite this great concern, the status of the species in Greenland has been largely unknown as it breeds in remote areas and in colonies for which population data has...
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In: Acta Oecologica, 1994, vol. 15, no. 5, p. 561-576
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In: Behavioral Ecology, 2009, vol. 20, no. 3, p. 601-608
Females of many socially monogamous bird species accept or even actively seek copulations outside the social pair bond. It has been shown that females profit from extrapair fertilization by increased offspring quality, but extrapair mating may also induce costs to females. We measured parental food provisioning and paternity in the reed bunting, Emberiza schoeniclus, a species with biparental...
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In: Animal Behaviour, 2009///doi:10.1016/j.anbehav.2008.11.002
Elaborate birdsong is thought to have evolved under sexual selection. Extrapair mating can enforce sexual selection and thus the selection of song traits. We investigated song rate and song diversity, two song traits previously shown to be under sexual selection, in relation to paternity success in the reed bunting, Emberiza schoeniclus, a species with high levels of extrapair paternity. We...
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Thèse de doctorat : Université de Fribourg, 2006 ; no 1541.
Trypanosoma brucei est l’un des plus anciens organismes à posséder de véritables mitochondries. Contrairement aux autres eucaryotes, il ne contient qu’une seule de ces organelles. Cette caractéristique unique fait de T. brucei un excellent système pour étudier certains aspects spécifiques de la biologie mitochondriale. Dans la première partie de cette thèse, nous avons utilisé T....
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Thèse de doctorat : Université de Fribourg, 2006 ; no 1544.
Le parasite protozoaire Trypanosoma brucei est l’agent pathogène responsable de la maladie du sommeil chez l’homme. En plus de son importance dans le domaine de la lutte contre les maladies tropicales, T. brucei est également un excellent modèle pour la recherche fondamentale car il présente beaucoup de caractéristiques qui lui sont propres. Par exemple, aucun ARN de transfert (ARNt)...
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In: Oikos, 2005, vol. 110, no. 1, p. 55-66
Detailed studies on mammals and birds have shown that the effects of climate variation on population dynamics often depend on population composition, because weather affects different subsets of a population differently. It is presently unknown whether this is also true for ectothermic animals such as reptiles. Here we show such an interaction between weather and demography for an ectothermic...
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