Barnacle Goose Breeding Population on Gotland and Öland Fell 98% as Adult Survival Declined
The former core breeding population on Gotland and Öland fell from about 5,290 pairs in 2002 to roughly…
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Research, conservation and new discoveries
A continuing selection of new studies, conservation projects and important developments connected to species in the archive.
Great Tits Had Paler Yellow Plumage in More Built-Up Urban Territories
Across 838 observations from six European cities, great tits breeding in territories with more impervious surface had lower…
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Locally Hatched Young Willow Warblers Declined 74% in Gotland Ringing Data
Standardised ringing at Sundre Bird Observatory found 74% fewer locally hatched first-year willow warblers in 2016–2024 than in…
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Irish and British Curlews Showed Little Genetic Separation but Both Differed From Swedish Birds
Whole-genome data from 56 Eurasian curlews found little differentiation between Irish and British birds but clear separation from…
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Wild Boar Used Smaller Areas Where Estimated Density Was Higher in Sweden
GPS data from 99 adult wild boar in Sweden showed smaller two-week space use at higher estimated population…
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Thermal Drones Found Nearly All Moose in Favourable Winter Weather
Swedish trials found detection close to 100% in cold, overcast winter conditions, but the survey effort needed for…
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Red Foxes Had Fewer Recorded Litters During Mange and When Both Lynx and Wolves Were Present
Across 52 years at Grimsö in Sweden, years with more voles had more confirmed red fox litters. Litter…
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Problem-Solving Great Tits Fed Chicks More Often and Delivered More Prey Biomass
In a wild great tit population on Gotland, problem-solvers fed their chicks more often and delivered more estimated…
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Shorter Days Altered Migratory Restlessness in Juvenile Robins but Not Garden Warblers
In a Lund experiment, juvenile robins exposed to a southern-France photoperiod showed a weaker rise in nocturnal migratory…
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Chiffchaff Subspecies Followed Different Migration Routes and Diverged Most Strongly at MARB
Tracking and genomic data from Baltic-region common chiffchaffs showed contrasting southwest and southeast migration routes, while the strongest…
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Wild Boar Harvests and Road Collisions Peaked in Years Without Major Beech and Oak Seed Crops
Wild boar hunting bags showed broad two-year fluctuations across parts of Central Europe. In Baden-Württemberg, both the number…
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Forest Disturbance Increased Modelled Habitat Suitability for Four European Herbivores
Tracking data from 3,069 animals showed that forest disturbance generally increased modelled relative habitat suitability for moose, red…
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Inheritance and Early-life Environment Both Shaped Pied Flycatcher Nonbreeding Areas
Tracking across the breeding range and a Netherlands–Sweden egg-translocation experiment showed that both inheritance and natal environment influence…
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Swedish Moose Winter Core Areas Reflected Forest-Patch Arrangement More Than Individual Patch Geometry
GPS data from 176 adult moose across seven Swedish populations showed that winter core areas differed from peripheral…
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H5N1 Outbreak Was Linked to Slower Movement and 13–14-Day Earlier Migration in Black-headed Gulls
During the 2023 Swedish H5N1 outbreak, GPS-tracked gulls from affected colonies slowed from about 0.52 to 0.24 m/s…
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East Greenland Barnacle Geese Fell to 65,516 While the Russian Flyway Held Near 1.5 Million
AEWA’s 2026 assessment estimated 65,516 East Greenland barnacle geese in March 2026, down from earlier peaks of 80,000,…
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North-west European Greylag Goose Winter Population Estimated at 802,320
The north-west European greylag goose population was estimated at 802,320 wintering birds in January 2025, well above the…
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More MHC Supertypes Did Not Generally Mean Fewer Blood-Parasite Infections in Bluethroats
Among 198 European bluethroats, researchers found 172 MHC class I alleles and eight functional supertypes. Carrying more supertypes…
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Fish-community Shifts Matched Changes in PCDD/F Decline in Baltic Murre Eggs
A long-term analysis linked three major Baltic fish-community phases to a steep decline, a 1990s plateau and a…
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Willow Tit’s Three Major Genomic Lineages Closely Matched Its Main Song Types
Whole-genome data from 88 willow tits representing all 14 subspecies revealed three major Palearctic genomic lineages whose broad…
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