Recuperaciones por condición para Lavandera cascadeña

The number of encounters has steadily increased over the years, with most birds encountered from the end of April to begin October. Recoveries in Britain, the Low Countries and Germany are mainly birds alive (ringing recovery). Recoveries in southern Europe (Spain and Italy) are mainly birds found dead or shot. Overall, the proportion ringing recoveries has increased while the proportion shot birds has decreased over time.

Movimientos anuales para Lavandera cascadeña

By March, most wintering birds have left Spain and arrive at their western and central European breeding grounds.The first birds arrive in Scandinavia by the end of March. Birds moving within the British Isles arrive at northerly breeding locations mainly in April, southerly breeders move erratically over short distances. Migrating birds from Scandinavian and central European breeding locations pass through western Europe in September and October. and arrive in Spain in October - November.

Conectividad por mes por región para Lavandera cascadeña

Birds breeding in Central Europe are recovered in Spain and southern France, mostly from November to January. Some birds from eastern breeding locations in Czechia and Slovakia have winter recoveries in Italy and Greece. Birds breeding in Scandinavia have most winter recoveries in Britain and West-Europe, the most southern recovery is in Northern Spain. There are many autumn recoveries at the coast of West-Europe of birds on migration with a Scandinavian origin. Birds breeding in Britain mostly winter in Britain, some winter recoveries are in Western France. There is only one recovery in southern Spain in December. Birds breeding in Western Europe mainly have winter recoveries in the western parts of France and Spain. There are also some winter recoveries in southern Britain.

Recuperaciones por condición para Pagaza piquirroja

Although ringing of this species has started in the early 20th century, most encounters have been obtained after the 1960s. They come mainly from the breeding season and especially from Jun – nearly half of all records (48%). Majority of encounters (65%) are recorded in N Europe. The encounters based on dead birds considerably decreased over time – from 86% pre-1960 to 14% after 1991; those based on alive birds markedly increased – from 1% pre-1960 to 84% after 1991. The latter is mostly due to ringing recoveries, and especially to metal ring readings in the field and colour mark encounters. Shooting constituted 58% of all cases before 1960, it is currently reduced to about 3%. Birds are locally trapped in W Africa (especially in the Inner Niger Delta in Mali) for sport, food and income (Zwarts et al. 2009).

Movimientos anuales para Pagaza piquirroja

Post-breeding dispersal starts in late Jul, the autumn movements are evident from Aug – numerous encounters (both coastal and inland) from W, C & E Europe. Mediterranean region is reached mainly Sep-Oct. Most breeding sites are left by Oct. The African wintering grounds (mostly Senegal, Mali & Ghana, but scattered records throughout the Sahel E to Chad) are occupied as early as Oct, but mostly in Nov.

First-year birds commonly remain in W Africa during the summer (Zwarts et al. 2009), some undertaking partial return migration (Kilpi, Saurola, 1984). Recent satellite-tracking study identified (based on 39 birds) W Sahel (69%), lake Chad (10%), Nile River Delta & Basin (8%); as main wintering regions in Africa; 13% remained to overwinter in S Spain (Rueda-Uribe et al. 2021).

Spring migration starts in Mar-Apr and the breeding sites are reached back in Apr-May.

Conectividad por mes por región para Pagaza piquirroja

Unlike most other tern species, Caspian Terns routinely fly overland on their way to and from the wintering grounds (Zwarts et al. 2009). In Europe, the Fennoscandian population undertakes the longest distance migration (Shiomi et al. 2015).

Baltic Sea population takes mainly SW & S routes, while the Black Sea region breeders – mostly SW. Dispersal movements after the breeding season start in late summer, lots of encounters are spread throughout Europe. Most birds reach S Europe & N Africa early to mid-autumn. A small part of them stay to overwinter (S Spain), while the bulk continues to the wintering grounds (mostly in W Africa, but also in C & E Africa) which are reached mainly in late autumn. Return migration takes place primarily in mid- to late spring.

A vagrant bird marked in USA has been encountered in UK during the 1930s.

Recuperaciones por condición para Mérgulo atlántico

Game species in Greenland and (under special regulation) in Russia.

Most encounters are obtained after 2005, exclusively during the breeding season – 99% in Jun-Aug (mainly adults): 19, 71 and 5% respectively. Encounters prior to 1960 are almost lacking. Those based on dead birds decreased markedly over the years – from 90% in 1961-90 (70% shot) to less than 1% after 1991. Inversely, the share of recoveries based on alive birds largely increased – from virtually none to more than 99% respectively, the latter mostly due to ringing encounters. The encounters based on shooting/hunting come exclusively from SW Greenland, while those based on alive birds – from Svalbard.

Ringing data from the Russian Arctic is absent.

Movimientos anuales para Mérgulo atlántico

Post-breeding dispersal starts in Aug or Sep. The species undergoes a flightless wing-moulting period after breeding season (Montevecchi, Stenhouse, 2020). Birds breeding in Svalbard and Bear Is during moult period move E into the Barents Sea, dispersing along the ice edge between S Spitsbergen and Novaya Zemlya (Fort et al. 2013). Later on, they take SW routes, subsequently being encountered in SW Greenland and Iceland mostly between Nov and Feb, Mar at latest.

Tagging of birds in E Greenland revealed an important post-breeding staging area (moult period) in the Greenland Sea (Mosbech et al. 2012), as well as wintering area off Newfoundland, ca. 2500km SW from the breeding colonies (Fort et al. 2012).

Breeding colonies are usually occupied in Apr-May (Stempniewicz 2001).

A theoretical model was recently developed of possible migration overturn driven by climate change, involving transarctic flights (Clairbaux et al. 2019).

Conectividad por mes por región para Mérgulo atlántico

Dispersal movements are evident from late summer, prominent migration takes place in early to mid-autumn. The Svalbard population is encountered wintering in SW Greenland and Iceland from late autumn to early spring. Wintering concentrations are known from the sea waters around Europe as well – Norwegian and North Sea (significant) and Arctic ocean (less numerous) (Stempniewicz 2001). Barents Sea seems to hold wintering the population breeding on the Franz Josef Land archipelago (Montevecchi, Stenhouse, 2020).

Influxes and wrecks occurred on a number of occasions in W Europe possibly triggered by prolonged food shortages during or immediately following severe storms (Camphuysen, Leopold, 1996), like the North Atlantic winter cyclones (Clairbaux et al. 2021).

Recuperaciones por condición para Págalo grande

Mostly dead recoveries, historically nearly 90% before 1960, but dropped to only one third of recoveries after 1990, representing a drastic change in the way we document movements of the species.

Movimientos anuales para Págalo grande

Movements between breeding areas are mainly documented from June to September. Birds from Shetlands are re-encountered along the West coast of Norway from September to December, with a few records in the Baltic Sea. Recoveries along the East coast of North America from November and December, when few records are obtained in Europe. Recoveries in the Bay of Biscay are mainly obtained in September and October, those in the Mediterranean Sea are mainly obtained from January to March. Tracking data of skuas from Foula, Shetlands, documented the individual migration and wintering strategies, with e.g. a summer migration to Norway and the Gulf of Biscay, from July to September, then overwintering off West Africa, from October to February (Furness et al. 2006).

Conectividad por mes por región para Págalo grande

Recoveries in South America (Guyana and Brazil) are from the end of the winter, December to March, with also few summering immatures. Similarly, recoveries off West Africa are from February to May, and those I the Mediterranean Sea also in the second part of the winter period. The species is probably off shore earlier in the winter, while the majority of dead recoveries away from the breeding grounds might bias the pattern towards unhealthy individuals that come closer to the shores than others.

Recuperaciones por condición para Mosquitero silbador

From 1975 to 2002 the annual number of recoveries fluctuated between 25 and 103, increasing in 2003–2010 to about 150. There has been a further increase (168–397) since then. In spring, most recoveries occur between 21 Apr and 20 Jun, in autumn the peak lies between 30 Jul and 8 Sep. Before 1960 about 70% of the recoveries were of dead birds, including 39% that were shot. Between 1960 and 1990 the percentage of dead birds fell to 16% with recoveries of live birds increasing from 23% to 82%. Since 1991 99% of recoveries have been of birds found alive.

Movimientos anuales para Mosquitero silbador

Wood Warblers are in Africa Nov- Mar. In Apr many migrants arrive in their breeding areas or are migrating around the Mediterranean Sep, although some birds are still in sub-Saharan Africa. In May most birds have reached their breeding areas. In Aug the early migrants reach S Europe. By Sep most birds have left their breeding areas and are on migration in S Europe, with a few birds already in their wintering areas. The last birds leave Europe in Oct.

Conectividad por mes por región para Mosquitero silbador

Birds breeding in Fennoscandia and C Europe are found in Morocco/Iberia, Tunisia/Sardinia and Italy in equal numbers in Apr–May, although the recoveries are concentrated in Italy in autumn. In Nov-Dec Fennoscandian birds are in Chad and Cameroon, while C European birds winter to the W in Mali, Burkina Faso and Niger. Those breeding in the British Isles are found in Italy in Sep-Oct, but also in Morocco (Sep) and Algeria (Apr) indicating that some birds migrate through Iberia to/from the British Isles. Birds from W Europe are found in eastern Algeria and Italy in April–May but, unlike other populations, they are mostly found in Iberia in Sep-Oct.

Recuperaciones por condición para Flamenco común

Overall, most (~60%) recoveries are of birds seen alive, mostly by reading their leg ring(s). However, even from 1990 to present many birds are still found dead, mostly sick/wounded (21%). As in many other large waterbirds, the use of leg rings has increased the number of recoveries very substantially, allowing a very good understanding of the species’ movement patterns and dynamics.

Movimientos anuales para Flamenco común

Dispersal of both juveniles and adults begins in Aug-Sep, although failed breeders may leave immediately after losing an egg or chick, hence well before Aug. Return to colonies is Feb-Apr in Spain; about one month earlier in N Africa, and one month later in France (Camargue) (Johnson 1989).

Conectividad por mes por región para Flamenco común

Greater Flamingoes have a very complex movement pattern, both temporally and spatially, since all birds from Europe form a single population. Therefore, see the ‘Overall connectivity’ and ‘Annual movements’ sections for details.  

Recuperaciones por condición para Bisbita arbóreo

Recoveries in Scandinavia are mainly birds found dead, sick or wounded. Recoveries alive are concentrated in the coastal ringing sites. In Great Britain and Western Europe about 50% of the recoveries are alive and 50% is found dead, sick or wounded. Only in Italy the majority of recoveries are birds shot, especially in northern Italy.

Movimientos anuales para Bisbita arbóreo

In December, January and February birds are in their wintering area, only very few birds stay in (Southern) Europe. In March the first birds arrive in Southern Europe, especially birds breeding in Great Britain and Central Europe. Birds breeding in Scandinavia however only arrive in second half of April. Most birds arrive in their breeding area in the last two weeks of April and first week of May. Birds start to leave the breeding area from the end of July. The migration peaks in the last week of August and first two weeks of September. Birds breeding in Great Britain seem to leave later and are recovered in South-West Europe only in September. In October and November, only few birds are still in Europe.

Conectividad por mes por región para Bisbita arbóreo

Birds breeding in Germany, the Low Countries and northern France are recovered in South-West Europe mostly in August and September. Same applies for birds breeding in Great Britain, one recovery in northern Italy in September reveals that also migration over Italy occurs. Birds breeding in West-Scandinavia are mostly recovered in South-West Europe in September, while more easterly Scandinavian birds are recovered in Central Europe and Italy in September. Several May-recoveries of eastern scandinavian breeders in Central Europe and Italy indicate that these birds use the same route in spring. Birds breeding east of Germany are recovered in Italy in September and October.

Recuperaciones por condición para Tarabilla norteña

Annual numbers encountered increased from around 150 before 2000 to around 200 between 2000 and 2008 and between 400 and 800 in 2013-2018. Up to 1960 about 77% of the recoveries were of dead birds, including 28% that were shot. However, in 1961–1990 this decreased to 27% and live recoveries increased from 13% to 70%. Since 1991 97% of recoveries have been of live birds.

Movimientos anuales para Tarabilla norteña

The first birds wintering in sub-Saharan Africa reach S Europe in Mar, and arrive on their breeding grounds in Apr, although many are still on migration in N Africa, Iberia and Italy. By May the last migrants are in S Europe; mainly birds breeding in the British Isles and Fennoscandia. In Jun–Jul the birds have reached their breeding grounds. In Aug the first autumn migrants arrive in Iberia and in Sep most birds are migrating S within Europe. By Oct most birds are in S Europe and the early ones are already in N Africa. During Nov– Feb most recoveries are in Morocco, Italy and, especially, Iberia. With very low encounter probabilities there are few sub-Saharan winter recoveries which have come from W Europe, the British Isles and Fennoscandia.

Conectividad por mes por región para Tarabilla norteña

Breeding birds from all regions are found in Iberia, especially Portugal, in Sep-Oct. Those breeding in S Fennoscandia are also found in N Italy in Sep–Oct. Birds encountered in Mar-May in Morocco are from all breeding regions in Europe. However, birds in Algeria in Mar-May exclude any from W Europe. Those in Italy in Aprare from breeding areas in Central Europe and Fennoscandia, while those in Iberia in Nov– Feb breed in the British Isles, W Europe and Fennoscandia. A bird encountered in N Italy in Dec was from N Finland.

Recuperaciones por condición para Abubilla común

Most encounters are obtained after 2000. They come from mainly from the breeding season – 88% from the period May-Jul. Majority of encounters are recorded in C, SW and SC Europe – ca. 97% (80, 11 and 6% respectively). The encounters based on dead birds decreased from 61-68% before 1990 to 6% after 1991; those based on alive birds markedly increased over time – from 19% before 1960 to 93% after 1991. The latter is mostly due to ringing recoveries, including ringing at nestboxes (26% of all encounters).  Shooting was responsible for 25-29% of all encounters before 1990 but it almost disappeared as a source of recoveries after 1991.

Some of the distant (>=50 km) recoveries are nearly 3000km away from the ringing site.

Long-distance recoveries from sub-Saharan Africa are almost lacking.

Movimientos anuales para Abubilla común

Post-breeding dispersal and autumn migration take place mostly Aug-Sep, the numbers progressively decrease onwards.

European breeding sites are reached back in Mar-May.

Tracked birds from the Swiss population are found to winter mostly in W Sahel, but low level of migratory connectivity has been found between their breeding and wintering areas; individual wintering sites differed between years (van Wijk et al. 2016). Some birds taking SW routes showed loop migration – staging in the region of Gibraltar mid-Aug/ early Sep, wintering in Mauritania/ W Mali for about 6 months (Sep-Mar) and spring migration passing eastwards, returning to the breeding sites early to mid-Apr (Bächler et al. 2010).

Weak spatial but strong temporal migratory connectivity has been found across four C European populations (van Wijk et al. 2018).

Conectividad por mes por región para Abubilla común

Dispersal and autumn migratory movements are mostly evident in late summer and early autumn, but small amount of birds are encountered as late as late autumn and single birds – even in winter (N to C & N Europe).  

N Africa is reached as early as late summer, mostly in early autumn. Birds stay in their wintering grounds in W Sahel about half a year (Bächler et al. 2010). Return movements start mid-winter to early spring. Within Europe, spring migration takes place mostly early to late spring.

Data from the isotope analyses supported the evidence that Spanish and Swiss breeders winter in W Sahel (Reichlin et al. 2013).

Median flight altitude during post-breeding migration was found to be ca. 1150m a.s.l., and ca. 1630m a.s.l. during pre-breeding migration; maximum altitude recorded was 4584 m a.s.l. (Liechti et al. 2018).

Recuperaciones por condición para Zarcero icterino

Overall, most (89%) recoveries are due to ringing. Before 1960, most recoveries were due to birds found dead, sick or wounded (ca. 40%) or birds dead by shot (ca. 30%). Then, only a 8% of recoveries were obtained through ringing. Between 1961-1990, however, this last proportion rose up to ca. 80% and, from 1991 to present, it comprises more than 90% of all recoveries.

Movimientos anuales para Zarcero icterino

Autumn migration starts in Jul; recoveries in Europe mostly up to Oct. Arrival to winter quarters from Aug to Oct (Kennerley & Pearson 2010). Spring migration starts late Feb to late Mar, passing through continental Europe from late Apr to even Jun (Kennerley & Pearson 2010).

Conectividad por mes por región para Zarcero icterino

N European populations pass over S Fennoscandia and the circum-Baltic region mostly in late May early Jun.; passage through central Mediterranean in the way to Africa mostly in Aug-Sep, up to Oct. Recoveries y N Egypt in Aug-Sep. Spring passage through the Mediterranean peaks in May.