Alauda

Online ISSN: 0002-4619
Publications
Article
Cet article porte sur la densité des busards cendrés #Circus pygargus$ et leur répartition en fonction des types de végétation dans la région située au nord du delta du Saloum (Sénégal), sur les rythmes d'activités de ces oiseaux et leur régime alimentaire
 
Article
The case of the two mimics Melodious and Icterine Warblers in sympatry in the context of a mobile hybrid zone is especially interesting from the evolutionary ecology viewpoint. The works of Camille FERRY have brought to light a wealth of key knowledge on the ecological and behavioural context of the sympatric life of both species and initiated several studies dedicated to the morphological and vocal consequences of sympatry of both mimics. These studies highlight morphological changes in H. icterine towards greater similarities with H. polyglotta as well as convergences in the songs of both species in areas of sympatry. Moreover molecular analysis have proven the uncommon occurrence of hybrids and introgression between both species in and around the sympatry.
 
Article
Numerous studies show that the current global climatic change results in an expansion, or a lesser regression, of thermophilous species. These studies are limited in time over the last decades and they sometimes used global analyses. The publication, in the 1830s and 1850s, of ornithological syntheses in three regions of France gives the opportunity to investigate the effects of global warming on birds populations over one and a half century, in a country straddling two climatic zones with wide landscape diversity. The comparison of avifaunas over this period shows a regression of thermophiles species in the non mediterranean region, and an extension of northern species in the two Mediterranean regions. This dynamics contradicts the expected trends based on the current evolution of climate. This result reflects the progress of the forested areas in France as a result of the decrease of agricultural and pastoral activities, because Mediterranean birds are species of open habitats, and because most European forest birds have a northern distribution. On the scale of a century, the effects of landscapes change on the avifauna override the effects of climate warming.
 
Article
The Bearded Reedling settled in Brittany in the late 1960'years. Birds from the Netherlands were recorded in the Audierne bay south to the Loire estuary. Over the past decades, the southern distribution in the Finistere area has fluctuated but did not change greatly. However we noticed regular movements between the Trunvel pond and the Porzay marshes in the Douarnenez bay. During a long time, individuals were only observed in winter and, in 2014, the first breeding pair was noted in Kervijen. We used data from banded birds from Kervijen to carry out our study. Individuals coming from the Audierne bay were young and female-skewed. These birds seemd to gain weight at the site and went back after banding.
 
Article
Between 1976 and 2007, nesting pairs of common terns and the number of fledglings per pair were counted on the left bank of the Scheldt. Between 1991 and 1997, helicopter landings caused serious disturbance in the colonies. Disturbance of nesting colonies by air-traffic landing is not well documented. Here the landings took place two or three days per week during each nesting season, at a rate of one to five per day. Out of 33 landings observed, 14 took place at less than 400 metres from the edge of the tern colonies. The shorter the distance between the landing spot and the edge of the colonies, the longer it took for the adults to return to the nest. It seemed likely that the breeding birds would become acclimatised to the landings. Despite these repeated disturbances, the Common Terns remained faithful to their nesting site, despite significant relocations of the colonies every year. The landings put to flight the breeding common terns and also drove away the herring gulls. During the period of the landings, a maximum of eight individuals of the latter were observed. A period of visible predation began in 1998, the year after the end of the landings. It is probable that the increase in predation is responsible for the fact that the reproduction rates between 1994-1997 and 1998-2007 showed no change. These results do not attain the threshold figures held to be necessary to maintain a stable population.
 
Article
The French Atlantic coast plays only a marginal role within the wintering area of Bar-tailed Godwit Limosa lapponica. Winter figure in January (mean annual number of 7,400 birds in 2000-2009) represents hardly 6% of the estimated total number. Winter visitors are found nearly exclusively along the coasts of North Sea, Channel and Atlantic. The analysis of census during the last thirty years shows that numbers are more or less stable despite a low decrease in the 1990s. The species distribution is mainly linked to the size of the used sites (functional unit) and to that of protected areas. Meteorological factors play a minor role in the species distribution. Winter numbers censused in the last five years (2005-2009) amounted to 8,000 birds. This means that at the 1 %, a site of national importance must harbour at least 80 birds (criterium 6 of Ramsar convention). Thirteen sites are thus of national importance but no French site is of international importance. The Bar-tailed Godwit is a species sensitive to disturbance. A suitable management of protected areas must be enhanced to maintain or to favour the species occurrence.
 
Article
The census showed between 8600-10,000 spoonbills Platalea leucorodia, 60,000 greater flamingos Phoenicopterus ruber and 1500 pairs of nesting white pelicans Pelecanus onocrotalus. Fifteen lesser flamingos Phoeniconaias minor were also seen. Part of the wintering spoonbill population was of Dutch and Spanish origin. The French (Camargue) origin of flamingos was also proved, but the number coming from this area remains a small part of the Banc d'Arguin total. Nearly half of the young pelicans reared do not reach the independant stage.-from English summary
 
Article
The high level of this wintering population reflected very high numbers of locust Schistocerca gregaria. A nightly roost of c1000 C. pygarus was discovered. -from English summary
 
Article
Breeding bird communities are considered to be a useful tool to assess changes at landscape scale especially in fluvial systems submitted to natural and anthropic pressures. Along the river Allier (415 km in length from the spring to the Loire confluence) breeding birds were censused in 1991, 1997 and 2005-06 by 91 point counts evenly distributed (one each 5 km). From 1991 to 2006, 45 out of the 146 species recorded showed significant variation in abundance. Species number showed a little decrease: 20 species were lost and 11 nex species were recorded during the study period. The analysis at the point count scale showed that missing species involved degenerate forest or open habitat species. In contrast, aquatic species increased in richness and in abundance. Results are compared to similar monitoring studies carried out along the river Loire and at national scale (STOC-EPS). Causes of population change are discussed in relation to environmental and anthropic factors.
 
Article
Numbers of White Stork breeding pair increased by 75% between 1995 and 2001. In 1998 and 2001 a majority of nest were found outside human settlements. In 2001, many nests were found on pylons (34%) as well as trees (44%). This increase in the breeding population is linked with an increase in yearly survival rates possibly caused by improvements of conditions at over wintering sites in sub-Saharan Africa, a increase in the proportion of sedentary birds and use of refuse tips for feeding.
 
Article
Fulmars have been recorded on the cliffs of Picardie since 1972 and breeding was first proven in 1979. With 72 "apparently occupied sites" (SAO) and 42 chicks recorded in 2002 the Picardie colony is one of the smallest in France. The study, started in 1997, has shown it has similar demographic characteristics to other larger and older colonies with, nonetheless, two notable points: an high population increase over a few years and a production rate apparently above the national average. The methodology for monitoring cliff-breeding Fulmar population is also discussed. Key periods in the breeding cycle, when it is possible to record the highest proportion of the population, have been identified or confirmed and important parameters are presented.
 
Article
The breeding Greater Flamingo Phoenicopterus roseus in Algeria, though long suspected, has never been proven before. During a systematic survey of salt lakes of the Haut Plateaux and eastern Sahara which are potential breeding sites, we were able to locate a breeding site, Garaet Ezzemoul, where the Greater Flamingo attempted unsuccessfully to breed for the past two years. We discuss the reasons for the previous breeding failure in Algeria of this flagship species and appropriate means to ensure its safe nesting.
 
Article
After the comprehensive annotated checklist of the birds of Tunisia published in 2005, this report deals with records collected between 2005 and 2014. Ten (or perhaps twelve) new species for the country could be added (Lesser Flamingo, Eastern Imperial Eagle, Black-winged Pratincole, Spotted Sandpiper, White-rumped Sandpiper, Lesser Yellowlegs, Sabinés Gull, Rose-ringed Parakeet, Citrine Wagtail, Pallas's Leaf Warbler and presumably Royal Tern and African Reed Warbler). Four species were found breeding for the first time (Yelkouan Shearwater, Glossy Ibis, Black-headed Gull, Grey Wagtail) and the breeding of two others needs to be confirmed (Northern Goshawk, African Reed Warbler). Some rarely recorded species have been recorded again (Red-throated Diver, Red-necked Grebe, Yellow-billed Stork, Greater Scaup, Greater Spotted Eagle, American Golden Plover, Sociable Lapwing, Red Phalarope, Grey-hooded Gull, Caspian Gull, White-rumped Swift, Blue-cheeked Beeeater, Hooded Crow, Brambling). The Slender-billed Curlew having not been recorded in recent years must be considered as extinct.
 
Article
The 9th National Census of tree breeding Herons colonies in France (7 species) occurred in spring 2007 (completed in 2008) thanks to a network of more than 787 observers belonging to 100 organisations, coordinated by Loïc MARION. The total number of nests reached 66 096 distributed in 1914 species-colonies (in 1387 sites). The Grey Heron was the more abundant (31 138 nests in 1236 colonies), but is levelling-off (+4,89% since 2000). The Purple Heron stopped its decline by increasing by 46% with 2828 nests in 192 colonies. However, the population of the Dombes had to be estimated (390 nests in 50 colonies) due to lack of census. The Black-crowned Night Heron, which also still largely winters in Africa, decreased to 3355 nests in 142 colonies, a drop of 20% in spite of increasing its number of colonies by 60%. Although also migrating, the Squacco Heron pursued its increase (108%) with 576 nests, albeit in only 18 colonies, 11 of which are in the Camargue, then largely limited its range in France. Thanks to the lack of long cold spells along the coasts since 1987, the Cattle Egret was still increasing (by 94%) with 14098 nests in 111 colonies, also in the large majority distributed in the Camargue and Languedoc-Roussillon, but it has pursued its expansion on the Atlantic coast up to Brittany and bred even in Normandy. The Little Egret, although benefiting from the same conditions, showed a limited increase (near 10%) with only 13 727 breeding pairs in 221 colonies, but still extended along the coasts up to Normandy. Finally, the Great White Egret, which appeared as a breeder at Lac de Grand-Lieu in 1994, is now well established, having formed new colonies in Loire-Atlantique and increasing its numbers in the Camargue and in the Somme where only isolated pairs bred before. This species now totals about 180 nests in 13 colonies in France.
 
Article
During the first half of February 2012 a severe and sudden cold spell occurred in France. Surveys by car and by walking (mainly in the Vendée region in West France) allowed to determine the number of dead birds found to amount 1,300-1,700 individuals/100km. These birds died either by collision with cars or by starvation or contacts with salt spread on roads. The Northern Lapwing was the main species involved (1,200-1,500 individuals/100km) followed by Common Blackbird, Song Thrush and Redwing. A very high mortality of some raptors was also observed.
 
Article
An unusual mixed song of Savi's Warbler Locustella lus-cinioides was recorded in a marsh in the north of France. The bird used alternatively two types of songs, resembling the Savi's Warbler and the Common Grasshopper Warbler Locustella naevia. This mixed song was confirmed by the interpretation of the sonograms. The species' identity was confirmed by the capture of the male. One of the most probable explanations of this atypical song is vocal mimicry rather than hybridization. The exposure to the Common Grasshopper song in its acoustic environment at an early stage of its life probably led the bird to mimick it.
 
-Évolution des effectifs de Vautours percnoptères sur les dortoirs du Pays Basque, par décades, au cours de l'année 2013. Numbers of Egyptian Vultures (each 10 days) on the roosts in the Basque country in 2013.
Article
The two communal roosts of Egyptian Vulture known in France are located in the Basque country where the birds are recorded while perching on dead trees. Counts were conducted on 32 visits at dawn and/or dusk between April and September 2013. The highest numbers were found in August with 36-40 individuals, a maximum not related to food availability. Adults and sub-adults were always the most abundant individuals while immature birds (1-3 years old) never accounted for more than 30 % of the birds present. Comparison with former years showed a decrease involving mainly immature birds. We suggest that camera trapping and GPS telemetry tracking are necessary in the future to improve our knowledge about the role played by these roosts in the species' dynamic and behaviour.
 
Article
During the last ten years, new data were collected on the Greater Flamingo in Algeria. The survey of the known breeding sites such as the El Golea se-bkha and other wetlands used by this species gave the opportunity to acquire a better knowledge of this species and to identify factors associated to breeding success at these very arid sites. In the last four years (2014-2017) six breeding events took place at El Golea and Lake Telamine (two of them showed the fledging of 280 young).
 
Article
393 nestlings were ringed in 2015 showing the best breeding success since the beginning of the study in 1980 (for comparison 65 young were ringed in 2013 and 240 in 2014). All the 10 forests studied except one contributed to this success (high percentage of occupied nestboxes, high num-bers of captured and controlled adults). In that year, among the 312 studied nestboxes, 196 were occupied by Tawny Owls, 31 by Pine Martens Martes martes, 8 by Squirrel Sciurus vulgaris and 1 by Wild Cat Felix sylvestris with young. 220 adults have been captured, about three quarters of them were already ringed. 6 controlled adults were at least 15 years old. The mean age of the controlled bids were of 6.36 years. 27 individuals ringed as nestlings were controlled for the first time as adults. Since 1980,1373 adults and 5990 young were ringed. 143 started broods gave 2.76 young and the size of 111 successful broods was of 3.55 young. The mean laying date is on 22 February. More than 80 % of preys were woodmice Apodemus sp. and Bank Voles Myodes glareolus. The pop-ulation status did not follow the same trend in the different forests. We now need to study the reasons for this difference.
 
Article
This paper deals with the invasion of Parrot Crossbills in Northern France in 2017 and in 2018. The first birds were noticed between 7 and 9 October 2017 in the Nord 'departement' and then in the Pas-de-Calais 'departement'. Since 14 October, the species was recorded in the Marquenterre (Somme) until 27 February 2008 (up to 1-23 birds per decade). In the Yvelines 'departement' the species is noted from 24 October to 18 March (2-5 birds). Some traits of their behaviour are reported. Former records in France are very rare: 3 mentions for the 19"1 century (1-6 birds) and 5 others for the 20th century (1 single each). The species was also recorded in 2017-18 in the following neighbouring countries: Germany (from 22 September onwards, first breeding record in April with 3 pairs), The Netherlands (records from 151 October to 29 April with at least 220 birds in autumn and 1 breeding record), Great Britain (from 3 October onwards) and Belgium (from 7 October to 26 January). No record in Luxembourg and in Switzerland.
 
Article
The Camargue (or Rhone delta) has been since the 19th century a man-controlled area. However, it remains one of the best preserved large deltas in the Mediterranean area. It includes since 1930 a well-known national botanical and zoological reserve and, since 1954 a research station, the Tour du Valat, that plays an active role in promoting scientific research and conservation action. In 1970 the Rhone delta even became a Natural Regional Park aimed at monitoring its human, agricultural and ecological development. The Camargue is well known for its birds particularly its breeding colonial waterbirds. The total number of breeding species increased from 104 species in 1938 to 117 species in 2000. The colonial waterbirds (ciconiiformes, flamingos and to a lesser extent gulls, terns and avocets) have increased in numbers. Among them several new species appeared (Bubulcus ibis, Casmerodius albus, Plegadis falcinellus, Platalea leucorodia, Larus melanocephalus, Chroicocephalus genei, Larus michahellis, Sterna sandvicensis). Other species became new breeding species (Cygnus olor, Anser anser, Netta rufina, Phalacrocorax carbo, Ciconia ciconia, Porphyrio porphyrio, Columba palumbus, Streptopelia decaocto, Clamator glandarius, Sturnus vulgaris...) or increased in numbers (Tadorna tardorna, Glareola pratincola, Coracias garrulus...). Only a few species declined or disappeared (Chlidonias hybrida, Ftemiz pendulinus, Lanius meridionalis...). Several man-induced factors played a major role in this overall dynamic (stabilized water levels, new feeding habitats, water eutrophication) but better protection action and more effective consideration of wetlands intervened as well. Although the present evaluation is globally positive, supervision and vigilance are still needed to ensure the future. This paper is dedicated to Luc HOFFMANN whose contribution to the conservation of the Camargue has been, and remains, crucial.
 
Article
Each "winter" the bird stayed for about 7 months (October to April). The staging microsite was the balcony of an occupied flat at the 1 5 floor of a building where the birds returned each evening to spend the night.
 
Article
On 10 August 2013, a Savi's Warbler Locustella luscinioides with aberrant plumage colour was caught and ringed in the Briere marshland (western France). The whole plumage, usually brown- reddish, was very pale brown; the naked parts (bill and legs) were also paler than usual. The aberrations of colour plumage of wild birds resulting from genetic mutations are varied and quite well-known. However, the naming of colour aberrations may still cause confusion now and again. According to the terminology established by van Grouw (2013), the colour aberration is due to the 'brown' mutation, transmitted hereditarily by a recessive and sex- linked allele. This mutation produces a reduction of eumelanin causing an overall paleness in the plumage and the naked parts (van Grouw, 2006, 2013). This observation is the first record of 'brown' mutation that we have discovered in Savi's Warbler, although several cases of pale plumages due to mutations among Acrocephalidae warblers were known beforehand.
 
-Occurence des comportements "fou" ou "mou" en fonction du mois.
Article
The abnormal behaviour of Capercaillie males (aggressiveness towards man, tameness) is a well-known but badly understood behaviour. Less is known on the etho-ecology of these males and their relation to congeners. Apart their special behaviour to human, these birds seem to have a normal way of life. In order to study its spatial and intra-specific behaviour a radio-tracked bird [Loco) was followed in the Pyrenees. We present here the results on its behaviour towards other species and dogs, its feeding behaviour and its relation to congeners. We try to interpret the adaptive values of this abnormal behaviour for the species.
 
Article
1. As far as river bird community is concerned, the operational assessment of connectivity for an upland river has not been addressed, despite its interest for policy makers and managers. Connectivity is defined here as the 'degree to which a landscape facilitates or impedes movement of organisms among (between) resource patches' (TISCHENDORF & FAHRIG, 2000). 2. From March 2000 to November 2002, monthly linear censuses (n = 171) were performed to quantify variations in abundance of 6 bird species describing the local (Gave d'Ossau; Pyrénées Atlantiques) community: Dipper Cinclus cinclus, Grey Wagtail Motacilla cinerea, White Wagtail Motacilla alba, Common Sandpiper Actitis hypoleucos, Kingfisher Alcedo atthis and Grey Heron Ardea cinerea. The extensive survey was carried out along two 4 km long river tracts ("upstream"; "downstream") 35 km apart and situated on the same fragmented river, they are separated by 4 hydroelectrical power plants and 3 dams. 3. Our analysis illustrates clear spatio-temporal patterns in river patch use by river birds with marked seasonal trends. Excepted for Dippers, the only species able to use high-altitude river patch throughout the year, the "upstream" tract (1250-1420 m) was not used during winter by the river bird community of 4 breeding species. The " downstream" tract (420-450 m) supported 6 species, 3 of which are regular breeders; this tract is probably a wintering site of strategic importance. The two sites are related since movements of birds occur between them. 4. Several kinds of movements were identified, according to species: i/ true migration for the Common Sandpiper, ii/ altitudinal 'transhumance' during winter for breeding species and iii/ postnatal dispersal followed by autumn movements for all species. 5. Despite severe fragmentation of the river 'gave d'Ossau', strong connections between sites exist, as revealed by bird movements, indicating that 'river connectivity' is not low. To further assess the connectivity in an operational way, there is a strong need of studying population dynamics of all the species forming this community of specialist river birds. 6. Maximum recorded densities reached 13.5 ind/km (all species) in winter and 6.5 ind/km in summer along "downstream" and " upstream" tracts respectively. We assume that these values (the first ever published for a whole community of upland rivers) are among the highest in Europe. These also represent the first attempt at quantifying carrying capacity of a river, which has major conservation implications.
 
Article
The French breeding population of Common Sandpipers (Actitis hypoleucos) is fragmented and the number of breeding pairs is estimated to be less than 1000. Many small isolated populations, especially those in The Pyrenees, remain undiscovered. We provide here the first results concerning a small population breeding along upland rivers (740-1,720 m above sea level) in the French Pyrenees National Park (Pyrénées Atlantiques; France). Abundance data was collected from five 4 km-long stretches of river during three consecutive breeding seasons (1998-2000). The mean density was always very low ranging from 0.05 (2000) to 0.15 pairs/km (1998 and 1999). The survey revealed the presence of a breeding pair at and altitude of 1710 meters above sea level. Factors explaining such low densities (altitudinal constraint, habitat quality or human disturbances) are explored.
 
Article
The Gulf of Gabès, in south-eastern Tunisia, is one of the most important Mediterranean wintering areas for the Greater Flamingo Phoenicopterus roseus. However, information on the ecological factors shaping the abundance and distribution of this species in this wintering area are lacking. During the winter of 2010-2011, we conducted repeated counts of flamingos in fifteen sites in the central part of the Gulf of Gabès. The collected data were used to investigate the abundance and distribution of flamingos in this particular wintering area. We found that the total number of flamingos inhabiting the studied area ranged from 262 to 1781, and the proportion of occupied sites varied between 27 and 80%. We also found that the abundance and distribution of flamingos showed a peak between mid-November and mid-January. After this period, the flamingos became gradually rare, as a result of adults' migration to northern breeding areas. In addition, our results showed that flamingos more frequently and more abundantly occurred in large mudflats (bays and estuaries) than in sandy beaches with small intertidal zones. The formers are likely to present more attractive feeding habitats because of their higher prey availability and accessibility. However, human presence (fishermen and shellfishers) did not appear to affect flamingos' abundance and distribution. Fishermen and shellfishers did not seem to constitute a threat or a major disturbing factor for flamingos.
 
Article
The France Regional Natural Parks cover a total surface of 15% in size of France. One of the parks mission is to preserve environmental heritage. The parks are also involved in National Action Plans. This is the case for the National Action Plan concerning the Aquatic Warbler, a species which occurs in France during its postnuptial migration. The parks can contribute to protect the available suitable habitats and to promote public policy for the conservation of this species.
 
-Répartition des habitats utilisés par le Phragmite aquatique sur les Barthes de la Nive. Habitats used by the Aquatic Warbler in the Barthes and Nives areas.
-Habitats sélectionnés ou rejetés par le Phragmite aquatique selon les indices de Jacobs et d'Ivlev sur les Barthes de la Nive. Selected or non-selected habitats by the Aquatic Warbler.
-Distance de déplacement entre deux localisations (en mètre /15 minutes) par type d'habitat. Boite de moustache pour phragmitaie pure (A), phragmitaie cariçaie (B), prairie humide (C) prairies de fauches (CP), saulaie (F) et cultures (K). Habitats sans différence significative selon test 2 à 2 a posteriori sont indiqués par une même lettre entre parenthèses. Moving distance by birds between two locations (m/15 minutes) according to habitat type.
Article
The present study deals with habitat selection and staging strategy of the Aquatic Warbler at a site in southwestern France: the Adour estuary. Twelve radio-tracked birds were studied during their staging in this area in August and September 2011. The data were analyzed according to the local habitat survey. The involved individuals exploit a mean area of 1.39ha +/-0.32 (Kernels 50%). They selected preferably mosaic of Phragmites and Scirpus and pure reedbeds. The birds seem to be able to adopt rapidly poorly flooded habitats but this remains an exception. The suitable wet micro-habitats allow also exploitation of more marginal habitats such as cereal cultivations and meadows. The area is used for short staging time, the birds exploiting small areas in response to an overall lack of larger-sized suitable areas the species find more to the north. Moreover, the area is threatened by an invasive tree-species Acer negundo whose thriving needs to be controlled. Reedbed being rare in that area, the Barthes and Nive areas are of conservation priority.
 
Article
The Aquatic Warbler is the most threatened passerine in continental Europe (according IUCN scale). The species is a long-distance migrant which migrates along the French Atlantic coast in August during postnuptial passage. One of the major staging area is the right bank of the Gironde estuary in southwestern France. We started a research project in order to define the strategy of occupancy of staging individuals. Our study was carried out in August 2010, 2011 and 2012. A first question addressed was to study the habitats and their use by radio-tracked individuals. A second one was to ring and to control marked individuals in order to know how long they staged on the study area. Our results showed that the species used preferably partially flooded or liable to flooding areas where the vegetation cover was short (Scirpa, or mosaic of Scirpa and Phragmites). Individuals avoided dryer grassy habitats or homogeneous reedbeds. They used small home range of some 6.64 ha in size for a really exploited range of 1 ha. The mean duration of staging was of 6.64 days. Due to rapid environmental changes, the selected habitat by the species are highly threatened on the right bank of the Gironde estuary. In order to ensure the overall availability of suitable habitats for the species, we created shallow marshlands covered with short and heterogeneous vegetation which can be managed by extensive grazing.
 
Article
The Aquatic Warbler Acrocephalus paludicola is a threatened long-distance migrant. Climate changes as well as loss of breeding, wintering and staging habitats have dramatic consequences on its populations. Recent studies showed that France hosts some major migratory staging sites, especially those located in the Loire estuary. In this context, the ACROLA project performed investigations on this small passerine in order to analyze the migration of individuals using staging sites in West France and to assess the impact of climate change by the North Atlantic Oscillation index. A ten-year study was thus carried out. The migration period takes place during the whole month of August. Generally the adults arrive earlier than the juveniles although some adult females are caught in September. The Donges marshland is considered as a crucial staging site for many individuals. These birds rest in reedbeds and feed in Scirpa-habitats before resuming their postnuptial migration. Other birds perform longer distance in search of favourable habitats and exploit neighbouring marshlands some 50km distant. Moreover, the change in NAO index results in earlier dates of arrival and influences the breeding success.
 
Article
Between-years breeding dispersal was studied for male Reed Warbler on the "Marais de Kérignon" (Guérande salt marshes) from 1986 to 1995. 97% of locally ringed males come back to breed on this marsh. The order in which the territories were occupied did not vary over the eight study years. The productivity of a given territory was related to its rank of occupation. With 64% of dispersal from one year to the next, males tend to change territory. The theory linking territory changes to age related social constraints cannot explain these movements as young males disperse as far as older ones. We put forward a three tier explanation of the between-territory movements of males: the rank of arrival on site, the quality of territories and the ability of males to protect their territories against late previous year occupants.
 
Article
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Article
During the breeding season, nests are built exclusively in reed Phragmites australis. Mean clutch size is 3.64. Breeding success reaches 71.7%, a high value explained by little loss of broods or clutches to predators (12.5% of eggs layed) or bad weather (12.5% of eggs layed). Between breeding seasons, adult mortality does not exceed 46%. -from English summary
 
Article
The breeding biology of Reed Warblers Acrocephalus scirpaceus was studied in the Bay of Audierne (West Brittany) from 1989 to 1992. The number of studied pairs varied from 10 to 12 between years. Breeding takes place over a four month period and it not possible for the species to successfully rear more than 2 clutches. About 40% of females lay two clutches and they raise, on average, 3.98 offspring per breeding season (s.d. = 2.40; n = 43).
 
Article
The Brière marshland is a Natura 2000 area where data on the postnuptial passage of this species were collected in order to improve the ecological knowledge on the rare and threatened Aquatic Warbler in Europe. Data deal with the carrying capacity of the Grande Brière - Donges and Brivet marshlands. Ringing of birds was carried out in August 2009, 2010 and 2011 at three sites which constitute the Natural Reserve of Brière marshland. 252 individuals were ringed during the three years, the Aquatic Warbler representing 3.6% of the 6,855 captured birds. At the three sites, 4.42 individuals of Aquatic Warbler were captured per day and per 100m of mist-nets. In 2011 the southern site totalized 70% of the captures with 9.95 individuals per day and per 100m of mist-nets, one of the highest value ever obtained in France. The habitats of each ringing site and food resources have been studied. The entomological survey showed the occurrence of more than 6,000 arthropods distributed over 8 orders and largely dominated by dipteran flies. 207 droppings have been analyzed to compare the diet of three Acrocephalus species (Sedge, Aquatic and Reed Warblers). The droppings of Aquatic Warbler showed a strong dominance of dipteran flies and a high proportion of large-sized arthropods. These prey-items showed that the Aquatic Warblers do not only exploit reedbeds but also, and importantly, the borders between water areas, reedbeds and wet grassy areas. This study emphasizes the high ornithological value of the Brière and Brivet marshlands and their associated reed- and open areas for the postnuptial migration of the Aquatic Warbler.
 
Article
In Charente-Maritime C.a. aeruginosus is particularly sedentary. Thus, of 122 marked adults that nested between 1985 and 1993, 96 (78.7%) were found in winter within a radius of 25km of their first known nest. Three birds attached with radio transmitters, each followed for four days from dawn to dusk, covered total areas of between 4.8 to 20km2. During the day, these birds passed between 18 and 44% of their time in the air. -English summary
 
Article
A high proportion (at least 63.3% for those fledged on the Ile d'Oleron in 1988) of juveniles are sedentary. Most of these birds did not move >10km from where they were hatched. Many different roosts (up to eight) can be used in succession by the same immature during one winter. Amount of time spent flying is correlated to weather conditions and the time needed to find food. The total area used by a female during six days of observations did not exceed 9km2, that of a male 22km2. -from English summary
 
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