References of "Libois, Roland"
     in
Bookmark and Share    
Full Text
See detailProtégeons nos mammifères: le point cinq ans après
Libois, Roland ULg

Learning material (1987)

Detailed reference viewed: 10 (3 ULg)
Full Text
Peer Reviewed
See detailEtude du régime alimentaire du sanglier (Sus scrofa L.) dans les Ardennes belges
Palata Kabudi, Jean Claude; Fetter, Serge; Libois, Roland ULg et al

in Cahiers d'Ethologie (1987), 7(3), 223-246

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of ... [more ▼]

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of faeces collected throughout the year and analysis of stomach contents during the hunting season only. The faeces analysis method allows to follow the diet seasonal variations but conceals the occurence of some feed and minimizes the ingestion of vertebrates and of artificial fodder. It results from both approaches that wild boars are opportunist and omnivorous with an obvious tendency to herbivory. The human influence, direct (artificial supply) or indirect (neighbouring cultivated open fields, forest and game management, enclosure, lot of disturbances), plays the leading part in determining wild boar's diet and its food search. As a whole, plant products from natural origin come in second place in its diet whereas other feed always remain occasional, with the exception of acorn and beech mast when superabouding. A few suggestions for reducing wild boar's damage to crop and forests close the paper [less ▲]

Detailed reference viewed: 99 (9 ULg)
Full Text
Peer Reviewed
See detailEléments pour l'identification des restes crâniens des poissons dulçaquicoles de Belgique et du Nord de la France. 1. Anguilliformes, Gastérosteiformes, Cyprinodontiformes et Perciformes
Libois, Roland ULg; Hallet, Catherine; Rosoux, René

in Fiches d'Ostéologie Animale pour l'Archéologie. Série A, Poissons (1987), 3

Ontline drawings of some fish bones are presented. These bones were selected since their shape is so typical that it allows the unambiguous identification of a definite species. Moreover, the authors did ... [more ▼]

Ontline drawings of some fish bones are presented. These bones were selected since their shape is so typical that it allows the unambiguous identification of a definite species. Moreover, the authors did compute some regression lines between the total length of some fish species and the length of thier typical bones. Twelve such relationships were calculted for eel and one for the three spined stickleback, the perch and the bullhead. All are highly significant [less ▲]

Detailed reference viewed: 156 (7 ULg)
Full Text
See detailAtlas des mammifères sauvages de Wallonie (suite). Le raton laveur, Procyon lotor (L., 1758)
Libois, Roland ULg

in Cahiers d'Ethologie (1987), 7(2), 140-142

The first record of the raccoon in Belgium is briefly reported. Since the species is well established for a long time close to the Duth and German boundaries, its presence in Belgium is not very ... [more ▼]

The first record of the raccoon in Belgium is briefly reported. Since the species is well established for a long time close to the Duth and German boundaries, its presence in Belgium is not very surprising. [less ▲]

Detailed reference viewed: 110 (8 ULg)
Full Text
See detailAtlas des mammifères sauvages de Wallonie. Le ragondin, Myocastor coypus (Molina, 1782)
Libois, Roland ULg

in Cahiers d'Ethologie (1987), 7(3), 303-308

Several observations or kills feral coypus are reported over southern Belgium (Wallony). They are not confined to any natural region or watercourse system. Since their frequency seems to be increasing, it ... [more ▼]

Several observations or kills feral coypus are reported over southern Belgium (Wallony). They are not confined to any natural region or watercourse system. Since their frequency seems to be increasing, it is to be feared that this rodent will develop well established or expanding populations [less ▲]

Detailed reference viewed: 88 (3 ULg)
Full Text
Peer Reviewed
See detailThe Unionid mussels (Mollusca, Bivalvia) of the Belgian upper river Meuse: an assessment of the impact of hydraulic works on the river water self-purification
Libois, Roland ULg; Hallet, Catherine

in Biological Conservation (1987), 42

In september 1983, the nine weirs regulating the flow of the river Meuse between Givet (France) and Namur (Belgium) were kept fully open for technical purposes. The water level therefore dropped, allowing ... [more ▼]

In september 1983, the nine weirs regulating the flow of the river Meuse between Givet (France) and Namur (Belgium) were kept fully open for technical purposes. The water level therefore dropped, allowing the sampling of benthic organisms and the mapping of the different kinds of banks. For each bank type, the density of unionids mussels was measured. Silt and fine gravel bottoms are the preferred habitats of these mussels. In these natural habitats, the mean biomass is estimated at more than 1.8 tonnes/ha. In pebbles this value is near 1 tonne/ha whereas in the stony blocks and on rocky bars it falls to 165 kg/ha. Man made banks are poor biotopes: 297 kg mussels/ha on old stoneworks and only 65 kg/ha on recent ones. When the filtration rate is considered, is can be shown that, at the time this study was under taken, the unionid mussels living on the Meuse banks filtered more than 300 litres water/sec. This rate will drop to 27 litres/sec within only a few years if the designed hydraulic works are carried out. This study emphasises the negative effects of these works on the self-purification capacity of the river. [less ▲]

Detailed reference viewed: 238 (1 ULg)
Full Text
See detailComportement d'adoption d'une nichée par un martin-pêcheur (Alcedo atthis) adulte
Libois, Roland ULg

in Cahiers d'Ethologie (1987), 7(3), 287-292

In the spring of 1986, a nesting male Kingfisher was accidentally drown during ringing operation. He was the father of five 11 days old nestlings which later starved to death. His female was meanwhile ... [more ▼]

In the spring of 1986, a nesting male Kingfisher was accidentally drown during ringing operation. He was the father of five 11 days old nestlings which later starved to death. His female was meanwhile brooding a second clutch. This cluth has been raised by a foster-father (an unknown adult male) whereas the female started a third clutch. [less ▲]

Detailed reference viewed: 29 (3 ULg)
Full Text
See detailEtude des critères d'implantation du terrier chez le renard roux (Vulpes vulpes) au Pays de Liège
Paquot, Anne; Libois, Roland ULg

in Cahiers d'Ethologie (1986), 6(1), 7-26

In the course of the spring 1984, the authors visited about 200 fox dens in the southern and eastern parts of the Province de Liège (eastern Belgium). Each den site was described. Then a multivariate ... [more ▼]

In the course of the spring 1984, the authors visited about 200 fox dens in the southern and eastern parts of the Province de Liège (eastern Belgium). Each den site was described. Then a multivariate analysis (reciprocal averaging) was performed to identify, when possible, the parameter(s) influencing the fox habitat choice. Fox dens generally are built in forested habitats with no or only a poor scrub layer and are southernly or westernly oriented. For what concerns the other habitat parameters, the fox appears to be very opportunistic. For example, in the vicinity of roads or human dwellings, his den will be established under a dense vegetation cover whereas in the middle of forested areas it has to be found in open wood or near clearcuts. In our study area, fox dens with more than 5 main entrances are not common. Frequently they are not occupied for more than one reproduction season. Cohabitation with badger was noted in 15 cases (59 fox occupied dens) and with rabbit in 4 cases only. [less ▲]

Detailed reference viewed: 73 (2 ULg)
Full Text
Peer Reviewed
See detailAperçu de l'évolution des populations de blaireaux (Meles meles) en Wallonie au cours de la période 1982/1985
Libois, Roland ULg; Paquot, Anne; Ryelandt, Daniel Etienne

in Cahiers d'Ethologie (1986), 6(4), 359-372

Since 1982 the gassing of fox earths (the main threat for the badger survival in Belgium) ceased but southern Belgium was also affected by a new outbreak of the rabies epizooty. In such circumstances it ... [more ▼]

Since 1982 the gassing of fox earths (the main threat for the badger survival in Belgium) ceased but southern Belgium was also affected by a new outbreak of the rabies epizooty. In such circumstances it appeared interesting to renew the census of occupied badger dens we made previously. The situation we observed in 1985 is nearly the same as in 1981/82. In the middle of the "rabies zone" however badgers settled again in old dens uninhabited for many years because of gassing. This trend is nevertheless counterbalanced dy the disaooearance of badgers from other sites due to snaring, trapping, digging up or plugging the earth's mouths, to human disturbance (namely clear felling) or eventually to rabies itself. The authors finally emphasize the need for a strict enforcement of the new hunting legal dispositions and for the adoption of non detrimental to badgers and effective measures against rabies (f.e. oral vaccination of foxes). [less ▲]

Detailed reference viewed: 69 (2 ULg)
Full Text
See detailBiogéographie et écologie des crossopes (genre Neomys, Kaup 1889)
Libois, Roland ULg

in Cahiers d'Ethologie (1986), 6(1), 101-120

As it was previously stated by Asselberg (1971), two species of the water shrews occur in Belgium. In fact, they are not easily distinguished from each other. That is why the author studied the frequency ... [more ▼]

As it was previously stated by Asselberg (1971), two species of the water shrews occur in Belgium. In fact, they are not easily distinguished from each other. That is why the author studied the frequency distribution of the mandibular length and the height of the ramus mandibulae in his Neomys samples. All of them were taken from barn owl pellets originating from southern Belgium. This morphological study shows that the mandidular height is a valuable discriminant character since 99.95 % of the water shrew mandibles are higher than 4.50 mm and 99.5 of the Miller's water shrew ones are smaller than this value. The taxonomical status of the Belgian populations of N. anomalus is discussed with the clinal (N to S) size variation of this species in the mind. Finally, distribution maps are presented. The water shrew is widespread all over Belgium and Luxemburg whereas the Miller's water shrew distribution area is restricted to the Ardennes (cambro silurian and low devonian substrates) eastern of the river Meuse. The catching points of this species in Belgium are briefly described and the habitat requirements of both species commented. [less ▲]

Detailed reference viewed: 76 (1 ULg)
Full Text
See detailA propos d'écholocalisation chez les chiroptères
Libois, Roland ULg

in Leboulangé, François (Ed.) IXéme Colloque francophone de mammalogie (1985)

Detailed reference viewed: 29 (7 ULg)
Full Text
Peer Reviewed
See detailLes ultrasons dans le monde animal: un aperçu
Libois, Roland ULg

in Acta Belgica. Medica Physica (1985), 8

Ultrasounds are produced and heared by a great variety of animals. Every zoological group considered has its own system of emission/audition. Ultrasounds appear to be used only in order to exchange some ... [more ▼]

Ultrasounds are produced and heared by a great variety of animals. Every zoological group considered has its own system of emission/audition. Ultrasounds appear to be used only in order to exchange some information with other members of a group or to echolocate i.e. to detect possible preys or obstacles with a sonar like system. The best know echolocating mammals are cetaceans and bats. Bats produce two kinds of ultrasonic signals: constant frequency emissions and frequency modulated pulses. Pure tones allow quick detection and identification of the prey, whereas echoes of FM pulses carry valuable informations on the quality of sound reflecting surfaces. Despite these highly sophisticated detection systems, the preys, mainly moths, can sometimes escape their predator. Some of the adopt an irregular flight, others are able deter the bats or to jam their echolocation clicks. [less ▲]

Detailed reference viewed: 109 (1 ULg)
Full Text
See detailSituation critique de populations nicheuses de martin pêcheur (Alcedo atthis) après le rude hiver 1984/1985
Libois, Roland ULg; Hallet Libois, Catherine

in Aves (1985), 22(4), 257-264

A census and checking of known nesting sites of the kingfisher were carried out on the Meuse and various watercourses in the south west of the Walloon region during the spring of 1985. This one followed ... [more ▼]

A census and checking of known nesting sites of the kingfisher were carried out on the Meuse and various watercourses in the south west of the Walloon region during the spring of 1985. This one followed an exceptionnally harsh winter, which was separated from the former harsh winter (1978/79) by five successive bad reproduction seasons (rainy summer 1980, cold spring 1981, humid spring 1982/83/84. Only 10% of the potential sites were occuried, but the survival rate was excellent (7.3 young fledged per adult nesting bird), thanks to an unusual number of third broods, probably in consequence of low intraspecific competition. These third broods were all reared by pairs fishing in the river Meuse itself, a fact that stresses the importance of this river forthe survival of the speies concerned, and pleads for the protection of the few favourable sites still in existence. [less ▲]

Detailed reference viewed: 37 (2 ULg)
Full Text
See detailL'Ardenne et la Gaume: un paradis pour nos mammifères sauvages ?
Libois, Roland ULg

in Comité de direction d'"Ardenne et Gaume" (Ed.) Le grand livre d'Ardenne et Gaume: la nature et l'homme (1984)

Detailed reference viewed: 20 (1 ULg)
Full Text
See detailSur le régime alimentaire de la chouette de Tengmalm (Aegolius funereus) en Belgique
Libois, Roland ULg; Gailly, Paul; Destexhe, Pierre

in Aves (1984), 21(1), 57-59

Detailed reference viewed: 34 (3 ULg)
Full Text
Peer Reviewed
See detailEssai synécologique sur les micromammifères d'Europe atlantique et ouest méditerranéenne: étude par analyse du régime alimentaire de Tyto alba (Scopoli)
Libois, Roland ULg

in Cahiers d'Ethologie (1984), 4(2), 1-202

Methods: owl pellets in Belgium, Corsica and in East Pyrenees. Quality of the samples: exhaustivity and representativity. Habitat evaluation in the barn owl home range: climate, orography, vegetation ... [more ▼]

Methods: owl pellets in Belgium, Corsica and in East Pyrenees. Quality of the samples: exhaustivity and representativity. Habitat evaluation in the barn owl home range: climate, orography, vegetation. Discussion for the method. Landscape structure and the mammal communities. Interspecific competition in island biocoenoses. [less ▲]

Detailed reference viewed: 173 (2 ULg)
Full Text
See detailAtlas des Mammifères sauvages de Wallonie (suite). Le genre Mustela L. en Belgique
Libois, Roland ULg

in Cahiers d'Ethologie (1984), 4(4), 279-313

The distribution and the present status of the polecat, stoat and weasel in Belgium are presented. At this time, these species are widely distribution all over the country and it seems that they aren't ... [more ▼]

The distribution and the present status of the polecat, stoat and weasel in Belgium are presented. At this time, these species are widely distribution all over the country and it seems that they aren't shortly threatened. Some original data on mortality causes are briefly discussed. Undoubtely, it appears that the major ones are trapping and killing by gamekeepers and road casualties, both accounting for more 70 % of the polecat's (n=96) and stoat's (n=45) losses and for 63% (n=101) of the weasel's ones. No information is available about possible death cases due to ingestion of poisoned baits. Poisoning, trapping and hunting are no longeur allowed in the northern part of Belgium (Flanders) but they are permitted in the southern part (Wallony) all over the year without any limitation (except for poisonning). With the legal protection of these animals in prospect, their dietary habits and their main behavioural and demographical characteristics are reviewed. [less ▲]

Detailed reference viewed: 71 (4 ULg)
Full Text
See detailLe lièvre
Libois, Roland ULg

Learning material (1983)

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailPeuvent ils s'adapter ?
Libois, Roland ULg

Learning material (1983)

Detailed reference viewed: 9 (1 ULg)
Full Text
See detailPour la loutre en Wallonie: le compte à rebours a commencé
Libois, Roland ULg

in Cahiers d'Ethologie (1983), 3(2), 267-271

In close connection with the otter conservation, the author rewiews what happened in Belgium since the publication of the report on threatened mammals in Wallony. Despite several deputies interventions in ... [more ▼]

In close connection with the otter conservation, the author rewiews what happened in Belgium since the publication of the report on threatened mammals in Wallony. Despite several deputies interventions in the Regional Council of Wallony, it appears that the legal status of the otter remained unchanged. Field research is still in progress and new occupied sites have been discovered. Unfortunately, hydraulic works are planned and some of them already realized in the river Ourthe, a tributary of the river Meuse, namely in a proportion still inhabited by a relictual otter population. [less ▲]

Detailed reference viewed: 10 (1 ULg)