Publications of Roland Libois
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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 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 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 detailBénin: chasseurs sans frontières... et sans scrupules
Libois, Roland ULiege

Learning material (1995)

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See detailRegime et tactique alimentaires de la loutre (Lutra lutra) en France: synthèse.
Libois, Roland ULiege

in Cahiers d'Ethologie (1995), 15(2-3-4), 251-274

More than 1500 otter spraint samples have been collected in different aquatic habitats throughout the present geographic range of the otter in France. Prey remains were identified, the relative occurrence ... [more ▼]

More than 1500 otter spraint samples have been collected in different aquatic habitats throughout the present geographic range of the otter in France. Prey remains were identified, the relative occurrence and abundance of each species was assessed and the biomass of each individual prey estimated. When available, data about the fish communities (size frequency- distributions, relative abundance) were compared with the diet of the mustelid. The main conclusions of the study are as follows: 1. The otter is mainly piscivorous but some other aquatic (crayfish) or semiaquatic preys (frogs, Natrix-snakes, some birds and mammals) are of major dietary importance in oligotrophic habitats. 2. The composition of the diet is determined by the local fish resources. The otter is an opportunistic predator, its diet varying greatly from one place to another. The diet can also change depending upon the season or upon some special circumstances such as frog or fish reproduction or strong prey-community changes. 3. Small fish are dominant in the diet. No size selection has been evidenced at least in the eel and in the cyprinid fishes. As far as the trout is concerned, it seems that the otter consumes preferably medium sized individuals. 4. The proportion of some prey species is lower in the diet than in the habitat. These are the more pelagic (bleak, sander, breams), rheophilic (dace, chub) or group-living species (minnow, roach). Bottom- (bullhead, eel, tench, gudgeon, barbel) or plant-living (rudd, pike) species are more frequent. [less ▲]

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See detailSituation actuelle de la loutre, Lutra lutra, en Belgique et problématique de sa conservation
Libois, Roland ULiege; Hallet, Catherine

in Cahiers d'Ethologie (1995), 15(2-3-4), 157-168

Widespread all over the country till the end of the last century, the otter has rapidly declined. In 1973 when hunting was definitely closed, the otter was already threatened and restricted to a few ... [more ▼]

Widespread all over the country till the end of the last century, the otter has rapidly declined. In 1973 when hunting was definitely closed, the otter was already threatened and restricted to a few localities. In 1889, the Belgian Ministry of agriculture decided to pay bounties for otters, a system which was cancelled only in 1963. Game statistics of the past century allow the annual otter bag to evaluated as roughly 25 % of the standing population. As it is the case in other European industrialised countries, freshwater habitat loss and water pollution lead to a considerable decrease of the river carrying capacity. Almost all the rivers flowing in the Northern part of Belgium are now lifeless or at least in a very bad condition. South of the river Meuse, some accidental pollutions are regularly reported (chloring in the river Ourthe in 1993; chloracetic acid in the Sûre in 1990...) and the level of organic pollution rises from year to year. Moreover, the tourism (angling, camp sites, kayak) nare more and more intensive leading to major disturbances, particularly during the summer months. Finally, the Ministery of equipment is developing a policy of big hydraulic works (dams, embankments, dredging...) along the river Ourthe, one of the last to be occupied by a few otters. [less ▲]

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See detailEtude du miveau de contamination par les PCBs et les pesticides organochlorés de loutres (Lutra lutra) et l'anguilles (Anguilla anguilla) issues de zones humides de l'oeust de la France
Tans, Michael; Hugla, Jean Louis; Libois, Roland ULiege et al

in Cahiers d'Ethologie (1995), 15(2-3-4), 321-324

Organochlorinated pesticides and PCBs were identified in 32 otter carcasses (road casualties) found in the wetlands of western France. The contamination levels are relatively low compared to those found ... [more ▼]

Organochlorinated pesticides and PCBs were identified in 32 otter carcasses (road casualties) found in the wetlands of western France. The contamination levels are relatively low compared to those found in other otter European populations. As eel is the main prey of otters in that area, samples of that fish from the Marais poitevin were analysed too. They also show a low level of contamination by these compounds, their PCB congener pattern being different. [less ▲]

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See detailEvolution récente du statut de la loutre dans le Parc National des Cévennes
Fonderflick, Jocelyn; De Kermabon, Jean; Libois, Roland ULiege et al

in Cahiers d'Ethologie (1995), 15(2-3-4), 233-238

In the south east of the Massif central, the Cevennes National Park covers the area along the dividing line between the Atlantic and Mediterranean catchment areas. The climatic conditions of these medium ... [more ▼]

In the south east of the Massif central, the Cevennes National Park covers the area along the dividing line between the Atlantic and Mediterranean catchment areas. The climatic conditions of these medium-sized mountains are very varied, with a high degree of seasonnality affecting the hydrologic regime of the rivers. The otter seems to have disappeared from that region around the 1960's. Some years ago, evidence was found again ona regular basis in some of these rivers. From 1990, the evolution of this otter population has been monitored by systematic observation of their signe in the principal watercourses covering an area of about 3000 km². At the same time, a preliminary study of the diet (spraint analysis) has been undertaken. Otter signs have been first evidenced on the upper reaches of the rivers Tarn and Lot. In subsequent years, signs have been disovered on some tributaries and on a watercourse flowing to the Mediterranean side: the river Luech. In the river Tarn (upper barbel zone), the most frequent prey is the gudgeon, reaching more than 50% of the total number of prey. However, when the biomass intake is considered, the barbel appears to play the major role, accounting for 46 % of the total food intake. The occurrence of the brown trout (11 %) and its relative biomass (18 %) are weak when compared with the composition of the river fish fauna (25 to 43 % of the estimated fish biomass). [less ▲]

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See detailDémographie du martin pêcheur (Alcedo atthis): incidences climatiques sur le succès reproducteur
Libois, Roland ULiege

in Aves (1994), 31(2-3-4), 198-199

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See detailMartin le bien nommé !
Libois, Roland ULiege

Learning material (1994)

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See detailLa loutre Lutra lutra, en Belgique. Situation désespérée ?
Libois, Roland ULiege

in La loutre au Luxembourg et dans les pays limitrophes. Quel avenir pour cette espèce menacée ? (1994)

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See detailLe loir (Glis glis)
Libois, Roland ULiege

Learning material (1994)

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See detailLe lérot: Eliomys quercinus
Libois, Roland ULiege

Learning material (1994)

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See detailLe muscardin (Muscardinus avellanarius)
Libois, Roland ULiege

Learning material (1994)

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See detailA quand une protection réelle et efficace pour le martin pêcheur ?
Libois, Roland ULiege

Learning material (1994)

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See detailDémographie du martin pêcheur (Alcedo atthis): incidences climatiques sur le succès reproducteur
Libois, Roland ULiege

in Gerfaut (1994), 84

It is well known that the Kingfisher populations decrease dramatically after a sever winter. The recovery depends on the climatic conditions of the next reproductive seasons. In order to understand the ... [more ▼]

It is well known that the Kingfisher populations decrease dramatically after a sever winter. The recovery depends on the climatic conditions of the next reproductive seasons. In order to understand the mechanism involved in this climatic influence, the fate of more than 500 broods was studied between 1985 and 1993. The study area comprises the river Meuse from Vireux (F,08) downstreams to Huy (B Liège) and the lower part of its main tributaries. The first egg laying date was determined for each brood, eggs were counted, pulli ringed at nest and the adults controlled and ringed when possible. Our main conclusions are i : the beginning of the first clutch is correlated with the thermic conditions of March. ii : the clutches are not synchronised, even on a same watercourse. iii : the egg probuction and the hatching success don't show clear variations between years abd habitat types (river, ponds and small streams) or depending on the clutch rank. iv : the fledged young production depends on how much broods are raised by the different pairs. v : the probability a pair is attempting a thrid brood is function of how early the first clutch is layed, the age of the male (older males settle earlier and are more productive), the habitat quality and the weather conditions (rain, temperature) in May. [less ▲]

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See detailLe blaireau européen (Meles meles)
Libois, Roland ULiege

Learning material (1994)

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See detailUtilisation du milieu et étude du dommaine vital chez le martin pêcheur en période de reproduction
Loncin, Anne; Libois, Roland ULiege

in Aves (1994), 31(2-3-4), 197-198

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See detailStatut, écologie et devenir des populations de loutre d'Europe (Lutra lutra) en France
Rosoux, René; Libois, Roland ULiege

in Actes séminaire international "La loutre au Luxembourg et dans les pays limitrophes. Quel avenir pour cette espèce menacée ?" (1994)

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See detailVers une protection dynamique de la loutre d'Europe en France. Considérations sur la réintroduction
Rosoux, René; Libois, Roland ULiege

in La loutre au Luxembourg et dans les pays limitrophes. Quel avenir pour cette espèce menacée ? (1994)

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