References of "Michaux, Johan"
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See detailPostglacial climate changes and rise of three ecotypes of harbour porpoises, Phocoena phocoena, in western Palearctic waters
Fontaine, Michaël; Roland, K.; Calves, I. et al

in Molecular Ecology (2014)

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See detailLa loutre en France et Navarre
Pigneur, Lise-Marie; Marc, Daniel; Fournier, Pascal et al

in Bulletin de liaison des Mammalogistes de Midi-Pyrénées (2014)

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See detailGenetic structure of fragmented southern populations of African Cape buffalo (Syncerus caffer caffer)
Smitz, Nathalie ULg; Cornelis, Daniel; Chardonnet, Philippe et al

in BMC Evolutionary Biology (2014), 14

Background African wildlife experienced a reduction in population size and geographical distribution over the last millennium, particularly since the 19th century as a result of human demographic ... [more ▼]

Background African wildlife experienced a reduction in population size and geographical distribution over the last millennium, particularly since the 19th century as a result of human demographic expansion, wildlife overexploitation, habitat degradation and cattle-borne diseases. In many areas, ungulate populations are now largely confined within a network of loosely connected protected areas. These metapopulations face gene flow restriction and run the risk of genetic diversity erosion. In this context, we assessed the “genetic health” of free ranging southern African Cape buffalo populations (S.c. caffer) and investigated the origins of their current genetic structure. The analyses were based on 264 samples from 6 southern African countries that were genotyped for 14 autosomal and 3 Y-chromosomal microsatellites. Results The analyses differentiated three significant genetic clusters, hereafter referred to as Northern (N), Central (C) and Southern (S) clusters. The results suggest that splitting of the N and C clusters occurred around 6000 to 8400 years ago. Both N and C clusters displayed high genetic diversity (mean allelic richness (Ar) of 7.217, average genetic diversity over loci of 0.594, mean private alleles (Pa) of 11), low differentiation, and an absence of an inbreeding depression signal (mean FIS = 0.037). The third (S) cluster, a tiny population enclosed within a small isolated protected area, likely originated from a more recent isolation and experienced genetic drift (FIS = 0.062, mean Ar = 6.160, Pa = 2). This study also highlighted the impact of translocations between clusters on the genetic structure of several African buffalo populations. Lower differentiation estimates were observed between C and N sampling localities that experienced translocation over the last century. Conclusions We showed that the current genetic structure of southern African Cape buffalo populations results from both ancient and recent processes. The splitting time of N and C clusters suggests that the current pattern results from human-induced factors and/or from the aridification process that occurred during the Holocene period. The more recent S cluster genetic drift probably results of processes that occurred over the last centuries (habitat fragmentation, diseases). Management practices of African buffalo populations should consider the micro-evolutionary changes highlighted in the present study. [less ▲]

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See detailNegative purifying selection drives prion and doppel protein evolution
Tsangaras, K.; Kolokotronis, S.-O.; Ulrich, R. G. et al

in Journal of Molecular Evolution (2014), 79(1-2), 12-20

The prion protein (PrP) when misfolded into the pathogenic conformer PrPSc is the major causative agent of several lethal transmissible spongiform encephalopathies in mammals. Studies of evolutionary ... [more ▼]

The prion protein (PrP) when misfolded into the pathogenic conformer PrPSc is the major causative agent of several lethal transmissible spongiform encephalopathies in mammals. Studies of evolutionary pressure on the corresponding gene using different datasets have yielded conflicting results. In addition, putative PrP or PrP interacting partners with strong similarity to PrP such as the doppel protein have not been examined to determine if the same evolutionary mechanisms apply to prion paralogs or if there are coselected sites that might indicate how and where the proteins interact. We examined several taxonomic groups that contain model organisms of prion diseases focusing on primates, bovids, and an expanded dataset of rodents for selection pressure on the prion gene (PRNP) and doppel gene (PRND) individually and for coevolving sites within. Overall, the results clearly indicate that both proteins are under strong selective constraints with relaxed selection on amino acid residues connecting α-helices 1 and 2. © 2014 Springer Science+Business Media New York. [less ▲]

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See detailNuclear and mitochondrial genetic structure in the Eurasian beaver (Castor fiber) - implications for future reintroductions
Senn, H.; Ogden, R.; Frosch, C. et al

in Evolutionary Applications (2014), 7(6), 645-662

Many reintroduction projects for conservation fail, and there are a large number of factors that may contribute to failure. Genetic analysis can be used to help stack the odds of a reintroduction in ... [more ▼]

Many reintroduction projects for conservation fail, and there are a large number of factors that may contribute to failure. Genetic analysis can be used to help stack the odds of a reintroduction in favour of success, by conducting assessment of source populations to evaluate the possibility of inbreeding and outbreeding depression and by conducting postrelease monitoring. In this study, we use a panel of 306 SNP (single nucleotide polymorphism) markers and 487-489 base pairs of mitochondrial DNA control region sequence data to examine 321 individuals from possible source populations of the Eurasian beaver for a reintroduction to Scotland. We use this information to reassess the phylogenetic history of the Eurasian beavers, to examine the genetic legacy of past reintroductions on the Eurasian landmass and to assess the future power of the genetic markers to conduct ongoing monitoring via parentage analysis and individual identification. We demonstrate the capacity of medium density genetic data (hundreds of SNPs) to provide information suitable for applied conservation and discuss the difficulty of balancing the need for high genetic diversity against phylogenetic best fit when choosing source population(s) for reintroduction. © 2014 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd. [less ▲]

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See detailThe genetic legacy of multiple beaver reintroductions in central Europe
Frosch, C.; Kraus, R. H. S.; Angst, C. et al

in PLoS ONE (2014), 9(5),

The comeback of the Eurasian beaver (Castor fiber) throughout western and central Europe is considered a major conservation success. Traditionally, several subspecies are recognised by morphology and ... [more ▼]

The comeback of the Eurasian beaver (Castor fiber) throughout western and central Europe is considered a major conservation success. Traditionally, several subspecies are recognised by morphology and mitochondrial haplotype, each linked to a relict population. During various reintroduction programs in the 20th century, beavers from multiple source localities were released and now form viable populations. These programs differed in their reintroduction strategies, i.e., using pure subspecies vs. mixed source populations. This inhomogeneity in management actions generated ongoing debates regarding the origin of present beaver populations and appropriate management plans for the future. By sequencing of the mitochondrial control region and microsatellite genotyping of 235 beaver individuals from five selected regions in Germany, Switzerland, Luxembourg, and Belgium we show that beavers from at least four source origins currently form admixed, genetically diverse populations that spread across the study region. While regional occurrences of invasive North American beavers (n = 20) were found, all but one C. fiber bore the mitochondrial haplotype of the autochthonous western Evolutionary Significant Unit (ESU). Considering this, as well as the viability of admixed populations and the fact that the fusion of different lineages is already progressing in all studied regions, we argue that admixture between different beaver source populations should be generally accepted. © 2014 Frosch et al. [less ▲]

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See detailHybridization capture using short PCR products enriches small genomes by capturing flanking sequences (CapFlank)
Tsangaras, K.; Wales, N.; Sicheritz-Pontén, T. et al

in PLoS ONE (2014), 9(10),

Solution hybridization capture methods utilize biotinylated oligonucleotides as baits to enrich homologous sequences from next generation sequencing (NGS) libraries. Coupled with NGS, the method generates ... [more ▼]

Solution hybridization capture methods utilize biotinylated oligonucleotides as baits to enrich homologous sequences from next generation sequencing (NGS) libraries. Coupled with NGS, the method generates kilo to gigabases of high confidence consensus targeted sequence. However, in many experiments, a non-negligible fraction of the resulting sequence reads are not homologous to the bait. We demonstrate that during capture, the bait-hybridized library molecules add additional flanking library sequences iteratively, such that baits limited to targeting relatively short regions (e.g. few hundred nucleotides) can result in enrichment across entire mitochondrial and bacterial genomes. Our findings suggest that some of the off-target sequences derived in capture experiments are non-randomly enriched, and that CapFlank will facilitate targeted enrichment of large contiguous sequences with minimal prior target sequence information. [less ▲]

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See detailDiet analysis of Leopoldamys neilli, a cave-dwelling rodent in Southeast Asia, using Next-Generation Sequencing from feces
Latinne, Alice ULg; Galan, Maxime; Waengsothorn, Surachit et al

in Journal of Cave and Karst Studies (2014), 76(2), 139-145

Leopoldamys neilli is a Murinae rodent endemic to limestone karst of Thailand and the Lao PDR, but its ecology and the reasons of its endemism to karst are still totally unknown. The aim of this pilot ... [more ▼]

Leopoldamys neilli is a Murinae rodent endemic to limestone karst of Thailand and the Lao PDR, but its ecology and the reasons of its endemism to karst are still totally unknown. The aim of this pilot study was to examine the plant composition of the diet of L. neilli at the level of order and family using DNA for molecular identification and to compare it with two other forest-dwelling Leopoldamys species, L. herberti and L. sabanus. A 202bp fragment of the rbcL gene was amplified and sequenced for twenty-three fecal samples of the three species using 454 pyrosequencing. We successfully identified a total of seventeen orders and twenty-one plant families, corresponding to thirty-three putative species, in the feces of these three Leopoldamys species. Solanaceae were the most common plants in the diet of L.neilli regardless of the region and sampling season, and they were also present in feces of both L. herberti and L. sabanus. The Araceae, Fabaceae, and Apocynaceae families were also identified in feces of L. neilli collected in various regions of Thailand and at different seasons. Plants of the Oleaceae family are consumed by both L. herberti and L. sabanus but were not found in the diet of L. neilli. Further improvements of the study, such as the use of additional genes, the creation of a reference collection, the microhistological examination of plant fragments to determine which parts of the plant are consumed, and the analysis of the animal diet of Leopoldamys are suggested to enhance the quality and accuracy of the results obtained. [less ▲]

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See detailIs Leopoldamys neilli (Rodentia, Muridae) a synonym of Leopoldamys herberti? A reply to Balakirev et al. (2013)
Latinne, Alice ULg; Chaval, Yannick; Waengsothorn, Surachit et al

in Zootaxa (2013), 3731(4), 589-598

Recently, Balakirev et al. (2013) presented a taxonomic revision of the genus Leopoldamys based on phylogenetic analyses. They identified five main Leopoldamys genetic lineages and suggested to rename ... [more ▼]

Recently, Balakirev et al. (2013) presented a taxonomic revision of the genus Leopoldamys based on phylogenetic analyses. They identified five main Leopoldamys genetic lineages and suggested to rename several of them. According to these authors, the genetic lineage previously thought to belong to L. edwardsi (lineage L1) should be assigned to L. revertens while L. neilli (lineage L2) should be considered as a junior synonym of L. herberti. Using molecular and morphological data from a large sampling of Leopoldamys specimens, the aim of the present study was to investigate the taxonomic status of L. herberti and L. neilli. This study reveals that, contrary to Balakirev et al.’s statement, both genetic lineages L1 and L2 occur in Nakhon Ratchasima Province, close to the type locality of L. herberti. We also show that the external measurements and color pattern of L. herberti are highly similar to those of L1 specimens but are not consistent with the morphology of L2 specimens. Therefore these results strongly suggest that L. herberti should be assigned to the genetic lineage L1. Consequently L. neilli should not be considered as a junior synonym of L. herberti and this study confirms that the appropriate name of the genetic lineage L2 is L. neilli. Moreover, as our results show that L. herberti should be assigned to the lineage L1, this name has nomenclatural priority over L. revertens, the species name suggested by Balakirev et al. (2013) for this lineage. [less ▲]

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See detailDiversity and endemism of Murinae rodents in Thai limestone karsts
Latinne, Alice ULg; Waengsothorn, Surachit; Rojanadilok, Prateep et al

in Systematics and Biodiversity (2013), 11(3), 323-344

This study aims to investigate the species diversity of rodents living in karst ecosystems of Thailand. A survey has been conducted throughout Thailand, 122 karsts sampled and 477 Murinae rodents live ... [more ▼]

This study aims to investigate the species diversity of rodents living in karst ecosystems of Thailand. A survey has been conducted throughout Thailand, 122 karsts sampled and 477 Murinae rodents live-trapped. Phylogenetic reconstructions were carried out using two mitochondrial markers (cytb, COI). A sequence-based species delimitation method completed by the analysis of the level of genetic divergence was then applied to define species boundaries within our dataset. The phylogenetic position of Niviventer hinpoon was also investigated and sequences obtained from the holotype specimen of this species were used to reliably identify samples of N. hinpoon. A total of 12 described Murinae species, corresponding to 17 deeply divergent genetic lineages, were encountered in limestone karsts of Thailand. Our study revealed an important genetic diversity within the traditionally recognized species Maxomys surifer (four highly divergent genetic lineages), Leopoldamys neilli (two highly divergent genetic lineages) and Berylmys bowersi (two highly divergent genetic lineages). These species could be considered as species complex and require further taxonomic work. This study also provides valuable information on the distribution of the two rodent species endemic to limestone karsts of Thailand, L. neilli and N. hinpoon. Leopoldamys neilli was the most abundant species encountered in Thai karsts during our survey. However, L. neilli specimens from western Thailand are genetically highly divergent from the remaining populations of L. neilli and could represent a separate species. Niviventer hinpoon, phylogenetically closely related to N. fulvescens, is much rarer and its distribution limited to central Thailand. Most of the other captured species are typically associated with forest ecosystems. This study suggests that limestone karsts play a key role in the preservation of the rodent species endemic to such habitat, but they would also provide refuges for the forest-dwelling Murinae rodents in deforested regions. [less ▲]

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See detailEvolutionary history of Leopoldamys neilli, a karst endemic rodent in Southeast Asia, and implications for its conservation
Latinne, Alice ULg; Waengsothorn, Surachit; Michaux, Johan ULg

Conference (2013, August 15)

In this study, we have investigated the phylogeography of Leopoldamys neilli, a Murinae rodent species endemic to limestone karsts in Southeast Asia, on the basis of mitochondrial and nuclear markers ... [more ▼]

In this study, we have investigated the phylogeography of Leopoldamys neilli, a Murinae rodent species endemic to limestone karsts in Southeast Asia, on the basis of mitochondrial and nuclear markers. Both mitochondrial and nuclear markers support a large-scale population structure of four main groups within L. neilli and a strong finer structure within each of these groups. A deep genealogical divergence among geographically close lineages is observed and denotes a high population fragmentation. Our findings suggest that the current phylogeographic pattern of this species results from the fragmentation of a widespread ancestral population and that vicariance has played a significant role in the evolutionary history of L. neilli during Plio-Pleistocene. This study revealed an unexpected high level of intraspecific diversity within L. neilli. Consequently, the four main L. neilli population groups should be considered as four distinct Evolutionarily Significant Units (ESUs) and require appropriate management and conservation plans. [less ▲]

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See detailOut-of-Himalaya: evolutionary history of the Dipodoidea (Rodentia) evidence the impact of past Asian environmental changes
Pisano, Julie ULg; Condamine, Fabien L.; Lebedev, Vladimir et al

Conference (2013, August)

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See detailApparent absence of a barrier to nuclear gene flow between mitochondrial lineages of the bank vole (Myodes glareolus) in Central Finland
Pisano, Julie ULg; Leblois, Raphael; Henttonen, Heikki et al

Poster (2013, August)

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See detailDesman des Pyrénées : Quand la génétique vient compléter les connaissances naturalistes...
Gillet, François ULg; Némoz, Mélanie; Blanc, Frédéric et al

Conference (2013, January)

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See detailNew advances on the phylogeography and molecular systematics of the Eurasian rodents2013
Michaux, Johan ULg

in Abstract book of the 13th Rodens & Spatium conference (2013)

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See detailConservation genetics : new tools and hope for threatened species
Michaux, Johan ULg

in abstract book of the 6th European congress of mammalogy (2013)

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See detailMolecular phylogeographt of the common dormouse
mouton, alice; Grill, andrea; Sara, Maurizio et al

in Abstract book of the 13th Rodens & Spatium conference (2013)

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