Results 41 to 50 of about 685 (183)

Behavioural responses of a gamebird to human encounters across the hunting season

Wildlife Biology, Volume 2026, Issue 2, March 2026.
We examined the behavioural adaptation of rock ptarmigan Lagopus muta in response to human encounters across the hunting season. We conducted disturbance experiments in two different parts of the species' range, in subarctic (Iceland) and in alpine (Italy) habitats.
Farina Sooth, Ólafur K. Nielsen, Ilse Storch   +2 more
wiley   +1 more source

Gyrfalcon in Alberta

The Canadian field-naturalist, 1957
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +2 more sources

Mapping Density and Distribution of Ptarmigan and Arctic Ground Squirrels within Gyrfalcon Breeding Territories in Western Alaska

, 2023
Shifting climate patterns are modifying Arctic habitats, stressing the need to understand how rapid climate and habitat changes affect Arctic trophic webs.
Gustafson, Michaela L.
core   +1 more source

Avian influenza overview September–November 2025

EFSA Journal, Volume 23, Issue 12, December 2025.
Abstract Between 6 September and 28 November 2025, 2896 highly pathogenic avian influenza (HPAI) A(H5) virus detections were reported in domestic (442) and wild (2454) birds in 29 countries in Europe. The magnitude and geographical extent of these detections were unprecedented for this time of the year, particularly in wild birds.
European Food Safety Authority, European Centre for Disease Prevention and Control, European Union Reference Laboratory for Avian Influenza, Hubert Buczkowski, Mariette Ducatez, Alice Fusaro, Jose L. Gonzales, Thijs Kuiken, Gražina Mirinavičiūtė, Karl Ståhl, Christoph Staubach, Olov Svartström, Calogero Terregino, Katriina Willgert, Evelyn Alarcón, Lisa Kohnle   +15 more
wiley   +1 more source

Trophic discrimination of amino acid ‐specific nitrogen stable isotopes in raptor nestlings: implications for estimating trophic position

Journal of Zoology, Volume 327, Issue 3, Page 236-247, November 2025.
We used high‐precision diet estimates from nest cameras to estimate amino acid‐specific trophic discrimination factors (TDFs) for gyrfalcon nestlings and compared these against TDFs for other taxa from the literature. TDFs for trophic amino acids in gyrfalcon were lower than values that have typically been used to estimate trophic position.
A. Bautista, D. L. Johnson, M. T. Henderson, D. L. Anderson, T. L. Booms, C. T. Williams   +5 more
wiley   +1 more source

A Helicopter Survey for Cliff-Nesting Raptors Along the Dalton Highway in Northern Alaska, 2010

Birds
We conducted a helicopter survey in 2010 for cliff-nesting raptors along the Dalton Highway in northern Alaska. The study area extended from the Yukon River northward ~395 km through the Brooks Range to the Arctic Plain.
Erica H. Craig, Jim D. Herriges, Tim H. Craig   +2 more
doaj   +1 more source

The overwhelming influence of ptarmigan abundance on gyrfalcon reproductive success in the central Yukon, Canada [PDF]

, 2011
Companion studies of Willow Ptarmigan (Lagopus lagopus) and Gyrfalcons (Falco rusticolus) in the central Yukon from 1978 to 1983 allowed us to examine Gyrfalcon reproductive performance at 14 nest sites in relation to ptarmigan abundance and other ...

core  

Absence of negative effect of GPS‐tags on survival and breeding success in a long‐lived territorial raptor

Ibis, Volume 167, Issue 4, Page 1053-1064, October 2025.
GPS tracking has enabled significant advances in the study of animal movements such as migration and habitat use. However, GPS devices can affect the behaviour of tagged individuals, especially for flying animals such as birds, and may ultimately impair their reproduction and/or survival.
Lise Viollat, Roger Pradel, Cécile Ponchon, Alain Ravayrol, Alexandre Millon, Aurélien Besnard   +5 more
wiley   +1 more source

White Gyrfalcon in Alberta

The Canadian field-naturalist, 1937
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +2 more sources

Effect of local prey availability on gyrfalcon diet : DNA analysis on ptarmigan remains at nest sites

, 2006
The aim of this study was to investigate how the diet of gyrfalcon Falco rusticolus in northern Sweden was affected by the relative availability of its two main prey species: rock ptarmigan Lagopus mutus and willow ptarmigan Lagopus lagopus.
Nyström, Jesper,, Ekenstedt, Johan, Angerbjörn, Anders,, Angleby, Helen, Dalén, Love,   +4 more
core   +1 more source