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See detailPhénologie et intensité de la migration postnuptiale diurne en Ardenne du nord-est par le suivi migratoire (Ramecroix, 2006 à 2010)
Beckers, Arnaud ULg; Baron, André

in Aves (2014), 51(2), 87-106

We present the results of five years of monitoring postnuptial migration in the northeast Ardennes (the Ramecroix site) from 2006 to 2010. The timing and intensity of migration have been calculated for ... [more ▼]

We present the results of five years of monitoring postnuptial migration in the northeast Ardennes (the Ramecroix site) from 2006 to 2010. The timing and intensity of migration have been calculated for the 19 commonest species. Phenology for each species varied markedly from year to year. The passage of two particular species (Northern Lapwing and Song Trush) was extremely concentrated in time. Comparison with data from the Netherland and from Les Awirs (Liège, Belgium) show differences between locations, for which we propose some explanations. The full dataset constitute a useful benchmark for future studies on the spatial variability of migration flow. [less ▲]

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See detailCauses de mortalité et survie du martin pêcheur (Alcedo atthis) en Europe
Libois, Roland ULg; Libois, François

in Aves (2013), 50(2), 65-79

This study reviews all available data for the European kingfisher in Europe (Euring database). The analysis of the mortality causes based on 966 juveniles and 753 adults reveals that a large proportion of ... [more ▼]

This study reviews all available data for the European kingfisher in Europe (Euring database). The analysis of the mortality causes based on 966 juveniles and 753 adults reveals that a large proportion of the carcasses (43%) are just reported as “found dead”. Other major causes of mortality listed in the database include percussions against a window (22%), collisions with engines (10%), other types of collisions (5%) or predation by domestic cats (5%). For both adults and juveniles, predation by cats is the most common death cause in Great Britain while in North Western Europe, mortality is mostly due to the percussion against windows. Juvenile mortality is highest at the end of the summer and in autumn, while adults decease mostly in the spring. The European kingfisher lifespan is short. Its demographic structure, studied in 4028 juveniles and 1131 adults, shows that mortality is very important during the first winter, as 70 % of the juveniles do not reach the next spring. The mortality rate is similar in subsequent reproductive seasons. The different pyramids of age are not identical (between adults and juveniles, between regions, between sexes) but the trend is similar: a reproductive individual has a probability of one third to reproduce the next year. Less than 10% of the European kingfishers survive over four years. [less ▲]

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See detailD'où viennent les Pies-grièches grises Lanius excubitor observées en migration et en hivernage en Wallonie ?
van der Elst, Denis; Beckers, Arnaud ULg

in Aves (2013), 50(2), 103-112

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See detailMigration et déplacements du martin pêcheur Alcedo atthis en Europe
Libois, Roland ULg

in Aves (2011), 48(2), 65-86

Previous publications on the migration and movements of kingfisher s have been limitid to a few countries; there has not been any previous synthesis of the data from the whole of Europe. The present study ... [more ▼]

Previous publications on the migration and movements of kingfisher s have been limitid to a few countries; there has not been any previous synthesis of the data from the whole of Europe. The present study,based on the Euring database, related to the movements of 5991 ringed and recaptured birds. The data were classified according to the status of each individual (pulli, juvenile or adult) as noted at ringing, the time of year (autumn and winter; spring; breeding period), and general geographical area. In the first autumn and winter, half of the pulli remained in the nesting area. Those that did move (between 25 and 250 km) dispersed approximately equally in all directions. The tendency to migrate was most marked among birds born in Sweden. The tendency decreases progressively in the sequence North Europe/Central Europe/ North Western Europe, where only 5 % of birds migrate, moving in a southwesterly direction. Juvenile birds are less mobile (approximately 80 %) than the pulli. Those which do move have the same pattern of dispersion as the pulli. The tendency to migrate is especially marked in North Europe, and is almost non existent in Gread Britain and in the Mediterrannean peninsulas. In springtime, most birds are already nesting, but some migrate towards the N or NE, and some are delayed in their overwintering location. During the nesting period, the ex pulli rarely take over the burrow where they were born, while the majority of juveniles tend to remain in the area where they were first captured. Some adults do change area ot the time, this tendeny being more accentuated among females, while male birds appear to be more attached to their home territory. In subsequent autumns the patterns of dispersion, of distance and of direction of ex juveniles and ex pulli are indistinguishable from those of the first automn. In Sweden the adults migrate, whereas elswhere adults have similar behaviour as juvenile birds; but adults are even more sedentary. [less ▲]

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See detailComportements de prédation en faibles profondeurs d'eau chez le Harle bièvre Mergus merganser
Delcourt, Johann ULg

in Aves (2010), 47(4), 201-212

This article describe the predation behaviour of the Common Goosander, observed on the river Ourthe during periods of low water levels. even though it is catalogued as a dinving duck, the bird can ... [more ▼]

This article describe the predation behaviour of the Common Goosander, observed on the river Ourthe during periods of low water levels. even though it is catalogued as a dinving duck, the bird can, starting from the "head under water" posture typical of the species, adopt a mode of search and pursuit of its prey which does not require diving. The "head under water" posture has been noted previously in the specialist literature, but it has never before been so precisely described. The fishing behaviour in very low water levels was never mentioned. We report here observations carried out in September 2009 and June 2010 on the site of the Grosses-Battes in Basse-Ourthe (Angleur, Liège, Belgium). These observations show that some summering individuals prefer a riffle zone as feeding site at times of low water level, even though many depper zones are accessible in the vicinity. [less ▲]

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See detailEtude des habitats utilisés par le Pic mar (Dendrocopos medius) en Région wallonne à partir de l'inventaire permanent des ressources forestières
Lehaire, François ULg; Monticelli, David; Paquet, Jean-Yves et al

in Aves (2009), 46(4), 149-163

Middle Spotted Woodpecker is one of the key species for which understanding the relationship with its habitat can have important implications for improving biodiversity-friendly management of hardwood ... [more ▼]

Middle Spotted Woodpecker is one of the key species for which understanding the relationship with its habitat can have important implications for improving biodiversity-friendly management of hardwood forests. This species is considered as an indicator of a forest ecosystem comprising a high proportion of mature trees and a botanical composition chiefly associated with oaks. For the last two decades, the Middle Spotted Woodpecker distribution range is expanding remarkably in the Walloon Region while, in contrast, other populations are either decreasing in the south-east of Europe or remain stable elsewhere in Europe. The study of this expansion range within the Walloon Region and of the forest habitats used therein is necessary to better assess the ecological requirements of the species. Based on more than 3,000 location data collected in the framework of the Atlas of breeding birds between 2001 and 2007, our study aimed at comparing forest habitats occupied by Middle Spotted Wood peckers between three geographically distinct areas, defined on the basis of the temporal evolution of the species’ distribution in the Walloon Region: the old distribution range, described from 1973-1977 and corresponding to the Ardennes and the Lorraine regions (southern Belgium), the transition range, defined in 1991-1992 and corresponding to the Fagne-Famenne region, and the expansion range, described in 2001-2007 and corresponding to the area colonized further north in the Loess region and Condroz. Overall, 418 woodpecker locations were crossed with 41 forest habitat variables available as part of the Regional Forest Inventory of the Walloon Region (IPRFW). Preliminary results suggest that, in agreement with previously known environmental requirements, forest stands presenting high densities in oak trees have been colonized by the Middle Spotted Woodpecker during its recent range expansion. However, the species is also expanding towards areas with a lower proportion of beech trees compared to the old distribution range, with a marked preference for forest stands presenting a high tree diversity. We conclude that the Middle Spotted Woodpecker may exhibit a certain flexibility regarding its habitats requirements in Walloon forests, which led us to suggest several recommendations aimed at promoting the conservation of the species and of the forest biodiversity in general. [less ▲]

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See detailEtude par radiopistage de la territorialité chez le martin pêcheur (Alcedo atthis): cas de deux mâles voisins
Hurner, H; Libois, Roland ULg

in Aves (2005), 42(1-2), 135-141

The kingfisher is generally considered as strongly territorial. However, different pairs are sometimes nesting at very close quarters. Two male kingfishers nesting along the river Meuse (Belgium) at a ... [more ▼]

The kingfisher is generally considered as strongly territorial. However, different pairs are sometimes nesting at very close quarters. Two male kingfishers nesting along the river Meuse (Belgium) at a distance of less than 500 m were radiotagged. Their respective home range (5.2 and 7.2 km) were largely overlapping, some fishing grounds being used simultaneously by both birds. Some kind of territorial defence (a bird chasing its neighbour) has been observed in a very limitid area around the nesting places. [less ▲]

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See detailAperçu du régime alimentaire du Grand Cormoran (Phalacrocorax carbo) dans les eaux intérieures du Pas-de-Calais (France)
Libois, Roland ULg

in Aves (2001), 38(2), 49-59

The stomach contents of 40 great cormorants shot during "regulation" operations in the Pas-de-Calais have been analysed. Eight stomachs were empty and 426 fishes belonging to 15 species were recovered in ... [more ▼]

The stomach contents of 40 great cormorants shot during "regulation" operations in the Pas-de-Calais have been analysed. Eight stomachs were empty and 426 fishes belonging to 15 species were recovered in the others. The dominant prey is the roach. Other regular prey are the common bream and the perch. Other fish (Salmonids, pike, pikeperch, ruffe, rudd, lamprey) appear in less than 5 stomachs. Most of the prey are small sized fish, less than 12 cm (total length). The biomass of 80% of the preys is less than 20g. However, the role of the greater fish in the diet must be emphasized: those weighing more than 200g (1% in numbers) reprensent 20% of the ingested biomass. [less ▲]

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See detailLe martin-pêcheur (Alcedo atthis) va-t-il bientôt manquer de sites de nidification ?
Libois, Roland ULg

in Aves (2001), 38(4), 161-178

In south-west Belgium, the breeding of the kingfisher was monitored for more than 10 years. During this period, 158 banks were regularly surveyed. Alterations or potential threats were identified: natural ... [more ▼]

In south-west Belgium, the breeding of the kingfisher was monitored for more than 10 years. During this period, 158 banks were regularly surveyed. Alterations or potential threats were identified: natural erosion, cattle trampling, disturbance from kayak-riders or anglers and, last but not least, consolidation works. Only 56 banks (35.4 %) can de considered as "safe". However, since the recent (2001) legal restrictions about the navigation on small rivers, 12 more banks are now safe too. Cattle trampling appears as the main threat (55 sites). However, the enforcement of the law regulating the fences along the rivers could easily solve the problem. Nineteen banks were completely destroyed for different purposes: navigation, road retaining walls or simply anti-erosive measures. Most of these works were undertaken along the river Meuse, the best nidification habitat of the area. (11 photos) [less ▲]

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See detailSuivi satellitaire de la migration automnale de la cigogne noire. Aléas et perspectives d'avenir
Libois, Roland ULg; Jadoul, Gérard

in Aves (1997), 34(1), 20-22

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See detailDéplacements prémigratoire et itinéraire de migration d'une cigogne noire (Cicinia nigra) juvénile suivie par télémétrie satellitaire
Libois, Roland ULg; Jadoul, Gérard

in Aves (1996), 33(1), 1-10

On 19th of July 1995, a juvenile black stork was caught in the vicinity of Bastogne (Province of Luxembourg, Belgium) and was fitted a PTT platform weighing about 75 grams. The locations obtained by the ... [more ▼]

On 19th of July 1995, a juvenile black stork was caught in the vicinity of Bastogne (Province of Luxembourg, Belgium) and was fitted a PTT platform weighing about 75 grams. The locations obtained by the Argos system were sorted according to their precision and the fixes of good quality (A,0,2 or 3 in the Argos classification) were mapped. From the 19th July to the first migration day (28 August at 09h GMT), more than fifty percent of the 109 obtained fixes are located inside a zone of 100 km² (5.65 km radius) centered near the capture point. Moreover, that zone bas been visited nearly every day by the bird. Twenty more percent of the fixes are situated in a wider area of 300 km² (9.77 km radius). That region is covered by spruce plantations, deciduous forests and cattle meadows with numerous small watercourses and several ponds including fish ponds. Some medium distance (10 to 110 km apart from the home range centre) movements were also recorded, mainly eastwards and westwards. No difference has been evidenced in the home range use during the 4 decades of monitoring. The migration travel was monitored till the 06th September, when the transmitter failed due to a technical misconception. At that time, the stork was located in the region of Fès (Morocco). Within 9 days, the bird has travelled a distance of ca 2,400 km (mean daily movement: 237 km). The Pyrenees were crossed in the high valley of the river Tech (Pyrénées Orientales, France) only 3 days after the departure and the bird has been seen by Spanish colleagues when flying across the strait of Gibraltar (Tarifa, 5 September, 07.55 h GMT). [less ▲]

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See detailUn autre regard sur les atlas de France et de Belgique.
Vansteenwegen, Christian; Dufrêne, Marc ULg; Lebrun, Philippe

in AVES (1995), 31

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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 ULg

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

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See detailRéussite de quatre nichées successives chez le martin pêcheur d'Europe (Alcedo atthis) au cours de la même saison
Libois, Roland ULg

in Aves (1993), 30(1), 31-36

From 1985 to 1992, 229 breeding pairs of kingfisher were studied to determine the reproduction success and the way population recovered after the severe winter 1984-85. From these investigations, we were ... [more ▼]

From 1985 to 1992, 229 breeding pairs of kingfisher were studied to determine the reproduction success and the way population recovered after the severe winter 1984-85. From these investigations, we were able to observe four successive nesting attempts by five different pairs. Four broods were raised by one of the pairs. As the adult were ringed birds and were regularky checked throughout the breeding season, ther can be no doubt, now, as to the possibility of a fourth brood for this species, at least in peculiar circumstances. [less ▲]

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See detailExpansion et régression: deux mots clés de la dynamique des populations du martin pêcheur (Alcedo atthis)
Libois, Roland ULg; Hallet, Catherine

in Aves (1989), 26(n° spécial "Actes...."), 93-101

Annual censuses of nest kingfishers are performed since 1973 in the valley of the river Lesse, a tributary of the river Meuse (Belgium). The authors document sharp population fluctuations. It appears that ... [more ▼]

Annual censuses of nest kingfishers are performed since 1973 in the valley of the river Lesse, a tributary of the river Meuse (Belgium). The authors document sharp population fluctuations. It appears that these are mainly due to the weather conditions prevailing at key-periods. Hard winters reduce the numbers, sometimes to a low level, whereas heavy late-spring or early- summer rains involve a bad reproduiction rate (namely through clutch losses following flooding). Hence, the recovery of the nesting population is weakened. In comparison, other factors such as predation, seem to have only a limitid effect. In other respects, the noxious consequences of permanent disturbances are illistrated in the that part of river Lesse where kayak is practised on a large commercial scale. [less ▲]

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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 ▲]

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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

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