References of "Vie et Milieu"
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See detailRégime et tactique alimentaires de la loutre (Lutra lutra) dans le Massif Central
Libois, Roland ULg

in Vie et milieu (1997), 47(1), 33-45

Otter spaints were collected in 1991 on a seasonal basis in the river Chavanon catchment, a tributary of the river Dordogne, in central France. Small sized species (bullhead, three-spined stickleback ... [more ▼]

Otter spaints were collected in 1991 on a seasonal basis in the river Chavanon catchment, a tributary of the river Dordogne, in central France. Small sized species (bullhead, three-spined stickleback, gudgeon and minnow) are the most numerous items in the diet: they account for more than 50% of the 3,148 identified preys. However, when expressed in relative biomass, their importance falls down (8 %). In fact, the brown trout, large cyprinid fish, birds and mammals make up the bulk of the diet. We found strong differences linked to the general habitat types and also seasonal ones. Frogs are mainly preyed upon during the spring whereas the snakes are exclusively taken in the summer and autumn months. Gudgeon and insects are also mainly summer and autumn preys. Perch and large cyprinid fish remais are more frequent during winter and even spring. The present results confirm the opportunistic way of predation of the otter and the fact that its hunting takes place more on the bottom and along the river banks than in the open water. [less ▲]

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See detailLes populations de rats noirs insulaires de l'ouest de l'Europe. Essai préliminaire de caractérisatin génétique (caryotype et ADN mitochondrial)
Libois, Roland ULg; Torrico, Jorge; Ramalhinho, Maria Graça et al

in Vie et milieu (1996), 46(3-4), 213-218

The colonisation of Europe by the black rat (Rattus rattus) dates back only to the Roman times. This rodent is now widespread all over the continent as well as on many islands where it was introduced by ... [more ▼]

The colonisation of Europe by the black rat (Rattus rattus) dates back only to the Roman times. This rodent is now widespread all over the continent as well as on many islands where it was introduced by man. In some instances, insular populations are morphologically differentiated by their great size. In order to study the possible origin of these insular populations, rats were caught on many Mediterranean (Sicily, Sardinia, Lavezzi, Corsica, Elba, Porquerolles) and Atlantic islands (Ré, Oléron, Azores) and compared to animals from continental Europe (Spain), and Africa (Tunisia, Benin). Their karoytype was determined and their mtDNA restriction patterns studied using the HAEIII and RSA I endonucleases and a polyacrylamide gel electrophoresis. These patterns appear very similar to each other though one of them is specific to the African animals, probably indicating that Europe and Africa were colonised by different strains. [less ▲]

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See detailBacteriogical evidence of leptospira infetion in wild mammals from Azores archipelago, Portugal (short report)
Collares Pereira, Margarida; Santos Reis, Margarida; Oom, Maria do Mar et al

in Vie et milieu (1996), 46(3-4), 380-381

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See detailOn the helminthofauna of wild mammals (Rodentia, Insectivora ans Lagomorpha) in Azores archipelago (Portugal)
Casanova, J. C.; Miquel, Jordi; Fons, Roger et al

in Vie et milieu (1996), 46(3-4), 253-259

The faunistic and ecological study of the helminthfaunas of mammals in Azorean islands is considered. 103 rodents (Rattus rattus L., 1758 and Mus musculus L., 1758) 9 insectivores (Erinaceus europaeus L ... [more ▼]

The faunistic and ecological study of the helminthfaunas of mammals in Azorean islands is considered. 103 rodents (Rattus rattus L., 1758 and Mus musculus L., 1758) 9 insectivores (Erinaceus europaeus L., 1758) and 19 lagomorphs (Oryctolagus cuniculus L., 1758) were analysed. The hosts been captured in several biotopes of thre islands (São Miguel, Terceira and Flores). 27 helminth species were detected (3 Digenea Trematoda, 5 Cestoda, 18 Nematoda and 1 Acantocephala). All hosts species show high prevalences and no significant differences were found between different islands. The helminthfaunas show typical features of a young island parasitofaunas. [less ▲]

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See detailDifférenciatio, génétique et morphologique du mulot, Apodemus sylvaticus, dans le bassin méditerranéen occidental
Michaux, J.R.; Libois, Roland ULg; Fons, Roger

in Vie et milieu (1996), 46(3-4), 192-203

Many questions are still unanswered about the biogeography and the origin of the wood mouse in the Mediterranean area, namely on the islands where some giant forms are described. In order to characterize ... [more ▼]

Many questions are still unanswered about the biogeography and the origin of the wood mouse in the Mediterranean area, namely on the islands where some giant forms are described. In order to characterize the genetic structure of these insular populations and the level of morphological differentiation, 232 animals originating from 30 localities situatid on several wester Mediterranean islands and on the continent, either along the sea coast or more inlabd, were trapped. Their skulls were measured and their mtDNA purified and analysed by RFLP techniques. The wood mice living on small islands are generally bigger than their relatives living on the continent whereas the size of those living on larger islands is quite the same. This kind of insular gigantism ought to be more an adaptive response to peculiar insular environmental conditions (particularly a lower predation pressure) than a consequence of a founder effect. The mtDNA of the wood mice from north eastern Spain belongs to the previously identified northwestern group. Consequently, the Pyrenees are not a biogeographic barrier to the wood mouse. The Sicilian mice, which are genetically different from all the other west European or north African animals, are morphologically similar to the Sardinia and Italian ones. [less ▲]

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See detailFirst approach on the skull morphology of the black rat (Rattus rattus) from Terceira and São Miguel islands (Azores archipelago)
Ramalhinho, Maria da Graça; Mathias, Maria da Luz; Santos Reis, Margarita et al

in Vie et milieu (1996), 46(3-4), 245-251

The present paper deals with an analysis of metric (cranial measurements) and non metric (epigenetic cranial characters) variation in black rat populations from S. Miguel and Terceira islands compared to ... [more ▼]

The present paper deals with an analysis of metric (cranial measurements) and non metric (epigenetic cranial characters) variation in black rat populations from S. Miguel and Terceira islands compared to a continental sample. Assuming the Azorean rats originate from the European continent, we tested the similarity between the samples, considering only adult and subadult animals. Having verified that there was no sexual dimorphism in the characters studied, we computed discriminant functions and made a PCA with the most discriminant variables. The three samples are clearly separated by these functions, the Azorean rats showing a larger general skull size and differing between the two islands. The Mean Measure of Divergence (MMD), based on non metric cranial traits frequencies, was also used to express the interpopulational differences: the rats of Terceira differ significantly either from the continental ones or from those of S. Miguel. Finally, the possible origin of these differences is disussed. [less ▲]

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See detailEvolution of shoot density of the Posidonia seagrass bed of Calvi Bay (Corsica)
Soullard, Mady; Bourge, Isabelle; Fogel, Julie et al

in Vie et Milieu (1994), 44

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See detailLe mulot de îles d'Hyères: un cas de gigantisme insulaire
Libois, Roland ULg

in Vie et milieu (1990), 40(2-3), 217-222

A sample of woodmice caught on the Porquerolles island, 2 km off the French coast (Var), has been studied and compared with other ones collected in Corsica and on the mainland. Some yellow-necked wood mie ... [more ▼]

A sample of woodmice caught on the Porquerolles island, 2 km off the French coast (Var), has been studied and compared with other ones collected in Corsica and on the mainland. Some yellow-necked wood mie (A. flavicollis) from Belgium are also included in the comparisons. Sixteen biometrical characters were measured on each wood mouse skull and statistical analyses performed: ANOVA, Student t-test and principal composent analysis. A. sylvaticus are all significantly smaller than the Porquerolles island wood mouse, nearly for all the tested variables. In fact, the size of the Porquerolles island wood mouse is quite comparable to that of the yellow-necked wood mouse. The masticatory system of the Porquerolles island wood mouse is nevertheless more developed than in the yellow-necked, making these forms clearly distinct from each other. Gigantism may be an evolutionary trend developed in response to the depletion of the predator/competitor on the island. [less ▲]

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See detailEcologie de la loutre (Lutra lutra) dans le Marais Poitevin 1. Etude de la consommation d'anguilles
Libois, Roland ULg; Rosoux, René

in Vie et milieu (1989), 39(3-4), 191-197

From 1982 to 1987, 165 otter scats samples were collected in the Marais Poitevin area (Western France). Eel was present in 158 of them. In our study area, eel was the main prey of the otter: its relative ... [more ▼]

From 1982 to 1987, 165 otter scats samples were collected in the Marais Poitevin area (Western France). Eel was present in 158 of them. In our study area, eel was the main prey of the otter: its relative frequency of occurrence in the otter's faeces amounted to 32.7% and its relative abundance to 40%. We did not find any dietary seasonal variation in terms of eel size or eel number. Prey size ranged from 9 to 65 cm (mean = 28 cm; n = 490) but mostly (75 %) less than 30 cm. In contrast these small individuals made up only 30% of the total eel weight represented by remains in the faeces. Eel size frequency distribution was compared in the otter's diet and in the rivers (data from Legault, 1987: electrofishing and fishing tackles). No significant difference was found, indicating that there was no selection at all in terms of prey size. [less ▲]

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See detailLes micromammifères dans le département des Pyrénées Orientales. Essai de répartition altitudinale en liaison avec les étages de végétation
Fons, Roger; Libois, Roland ULg; Saint Girons, Marie Charlotte

in Vie et milieu (1980), 30

In the Pyrénées-Orientales, distribution of small mammals and relative densities of the different species are governed by the lanscape: coastal and brackish water vegetation, agricultural areas in the ... [more ▼]

In the Pyrénées-Orientales, distribution of small mammals and relative densities of the different species are governed by the lanscape: coastal and brackish water vegetation, agricultural areas in the Roussillon plain, mediterranean land vegetation, forests of lower montain and subalpine levels, alpine pastures. Finally topographic plays its role in the linkage of biocenoses and in particular by the orientation of the three main valleys with the resulting distribution of solar impact: mediterranean species attaining relatively high altitudes in warm sites paralleled by mountain species descending fairly low on shady slopes. In the area studied, the subalpine and low mountain levels are characterized by the absence of Crocidurinae, and the presence of Sorex "araneus", Sorex minutus, Microtus arvalis, Arvicola terrestris and Clethrionomys glareolus. The mediterranean level is characterized by the absence of Sorex and the presence of Pitymys duodecimcostatus and Mus spretus. Crocidura russula, C. suaveolens and Suncus etruscus occur in considerable numbers, but their presence is not typical of the mediterranean biome. The submediterranean level (transition zone) is the richest in terms of species number, as it comprises the zone of faunal overlap according to local solar impact. [less ▲]

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See detailPrésence du campagnol des neiges Microtus nivalis Miller 1908, dans les collines du Roussillon
Fons, Roger; Libois, Roland ULg

in Vie et milieu (1977), 27(2), 279-282

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