26 results for "Yves Desdevises"
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Journal Article
Big Steps, Little Change: A Case Study in French University Teachers’ Cognitions in the Context of Pedagogical Innovation
The rate of failure of French students during their first years at university is substantial, with only 42% graduating in the expected three or 4 years. As a result, French universities have called for a “pedagogical transformation” encouraging innovative teaching practices to improve undergraduate…
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Morphological and molecular evolution are not linked in Lamellodiscus (Plathyhelminthes, Monogenea).
Lamellodiscus Johnston & Tiegs 1922 (Monogenea, Diplectanidae) is a genus of common parasites on the gills of sparid fishes. Here we show that this genus is probably undergoing a fast molecular diversification, as reflected by the important genetic variability observed within three molecular…
Also available at: PLOS
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Journal Article
Link between bacterial communities and contrasted loads in ectoparasitic monogeneans from the external mucus of two wild sparid species (Teleostei)
Abstract Background While teleost fishes represent two thirds of marine vertebrates, the role of their external microbiota in relationship with their environment remains poorly studied, especially in wild populations. Hence, the interaction of their microbiota with ectoparasites is largely unknown…
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Exploring archaeal and bacterial diversity and co-occurrence in Lake Geneva
The diversity and relationships between Archaea and Bacteria remain poorly examined in lakes. Using universal primers targeting 16S rRNA gene via Hiseq sequencing, we explored archaeal and bacterial diversity, structure and relationships in the largest natural deep lake in Western Europe, i.e. Lake…
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A snapshot of the population structure of Branchiostoma lanceolatum in the Racou beach, France, during its spawning season.
A methodology for inducing spawning in captivity of the lancelet Branchiostoma lanceolatum has been developed recently with animals collected at the Racou beach, in the southern coast of France. An increasing amount of laboratories around the world are now working on the evolution of developmental…
Also available at: PLOS
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Genetic variation in East-Adriatic populations of the Asian tiger mosquito, Aedes albopictus (Diptera: Culicidae), inferred from NADH5 and COI sequence variability
In the last few decades, Aedes albopictus (Skuse) (Diptera: Culicidae) (= Stegomyia albopicta), the so-called "Asian tiger mosquito", has spread from its native range in southeast Asia to Africa, the Middle East, Europe, the Americas, and Pacific islands. The spread of this species poses a risk to…
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Journal Article
Bdellovibrio and Like Organisms in Lake Geneva: An Unseen Elephant in the Room?
When considering microbial biotic interactions, viruses as well as eukaryotic grazers are known to be important components of aquatic microbial food webs. It might be the same for bacterivorous bacteria but these groups have been comparatively less studied. This is typically the case of the…
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Morphological plasticity and phylogeny in a monogenean parasite transferring between wild and reared fish populations.
It is widely accepted that disease interactions between cultured and wild fish occur repeatedly, although reported cases have mainly relied just on the observation of similar symptoms in affected populations. Whether there is an explicit pathogen transfer between fish stocks, or each develops its…
Also available at: PLOS
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A Comparative Study of the Dynamics and Diversity of Bdellovibrio and Like Organisms in Lakes Annecy and Geneva
Bdellovibrio and like organisms (BALOs) are obligate bacterial predators of other Gram-negative bacteria. Here, we used quantitative PCR (qPCR) and recently developed specific primers which target the 16S rRNA gene to explore the abundance and distribution of three families of BALO belonging to the…
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Journal Article
Diversity and structure of sparids external microbiota (Teleostei) and its link with monogenean ectoparasites
Abstract Background Animal-associated microbial communities appear to be key factors in host physiology, ecology, evolution and its interactions with the surrounding environment. Teleost fish have received relatively little attention in the study of surface-associated microbiota. Besides the…
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Journal Article
Host-microbiota-parasite interactions in two wild sparid fish species, Diplodus annularis and Oblada melanura (Teleostei, Sparidae) over a year: a pilot study
Abstract Background The microbiota in fish external mucus is mainly known for having a role in homeostasis and protection against pathogens, but recent evidence suggests it is also involved in the host-specificity of some ectoparasites. In this study, we investigated the influence of seasonality…
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Monogeneans of West African cichlid fish: evolution and cophylogenetic interactions.
The goals of this paper were to investigate phylogenetic and evolutionary patterns of cichlid fish from West Africa and their Cichlidogyrus and Scutogyrus monogenean parasites, to uncover the presence of host-parasite cospeciation and to assess the level of morphological adaptation in parasites…
Also available at: PLOS
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Journal Article
Exploring microbial and metabolite composition of the external mucus of wild Mediterranean sparids: is there a link with their monogenean ectoparasites?
Abstract Background External mucus forms a complex interface that constitutes the first line of defense in teleost fish. In addition to host-derived molecules, this mucus harbors bacterial communities capable of producing a wide range of bioactive compounds. The structure and function of these…
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A new family for Cephalotrema elasticum (Digenea) based on molecular data, with notes on the status of the definitive host population
Abstract The host diversity, complex life cycle and distribution of digeneans underline their value as bioindicators of ecosystem health. We examined the intestinal digenean trematode Cephalotrema elasticum of insectivorous mammals, sampled from Gammarus balcanicus (Crustacea: Amphipoda) as second…
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Low-diversity bacterial microbiota in Southern Ocean representatives of lanternfish genera Electrona, Protomyctophum and Gymnoscopelus (family Myctophidae).
Myctophids are among the most abundant mesopelagic teleost fishes worldwide. They are dominant in the Southern Ocean, an extreme environment where they are important both as consumers of zooplankton as well as food items for larger predators. Various studies have investigated myctophids diet, but…
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Characterization of ecto- and endoparasite communities of wild Mediterranean teleosts by a metabarcoding approach.
Next-generation sequencing methods are increasingly used to identify eukaryotic, unicellular and multicellular symbiont communities within hosts. In this study, we analyzed the non-specific reads obtained during a metabarcoding survey of the bacterial communities associated to three different…