Results 61 to 70 of about 709 (138)
No support for solar radiation as a major evolutionary driver of malar stripes in falcons
Journal of Avian Biology, Volume 2025, Issue 3, May 2025.The malar stripes of falcons (Falco spp.) are often hypothesised to function by reducing the amount of solar glare reflected into the falcon's eyes while hunting, thereby aiding foraging efficiency in bright conditions. This ‘solar glare hypothesis' is supported by intraspecific trends in peregrine falcons Falco peregrinus, in which populations ...
Michelle Vrettos +2 more
wiley +1 more source
First Record of Nestling Relocation by Adult Gyrfalcons (\u3cem\u3eFalco rusticolus\u3c/em\u3e) Following Nest Collapse [PDF]
, 2017 Nest collapse has been documented in many bird species, with little discussion of adult behavior following collapse. We present evidence of a partial collapse of a Gyrfalcon (Falco rusticolus) nest during the nestling period and the subsequent adult ...
Robinson, Bryce W. +7 more
core +1 more source
, 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
Пернатые хищники и их охрана, 2018 On September 23, 2017, at the Dzhankoy Automobile Border-crossing Point at the Russian-Ukrainian border in the Republic of Crimea, the officers of the Crimean Customs together with the officers of the Federal Security Service Directorate stopped the ...
Igor V. Karyakin, Elvira G. Nikolenko
doaj +2 more sources
Gyrfalcon predation on ptarmigan: numerical and functional responses
, 1999 Summary 1. Gyrfalcon predation on ptarmigan during the breeding season was studied in north-east Iceland 1981±97. The ptarmigan population went through a complete 10-year cycle of numbers with a 4´3-fold dierence in density between high and low years ...
K Nielsen, O Â Lafur
core
Princess of the North : perceptions of the gyrfalcon in 16th-Century western Europe [PDF]
, 2018 For centuries, European falconers considered the arctic and sub-arctic gyrfalcon (Falco rusticolus) an exquisite bird of prey, praised for her size and strength, her ability in the hunt, and her rarity.
De Smet, Ingrid
core
Пернатые хищники и их охрана, 2020 In December 2018, the Petropavlovsk-Kamchatsky City Court convicted seven members of a criminal group under Part 3, Article 258.1 of the Criminal Code of the Russian Federation for illegal hunting and trafficking of Gyrfalcons (Falco rusticolus).
Igor V. Karyakin, Elvira G. Nikolenko
doaj
Gyrfalcon Diet During the Brood Rearing Period on the Seward Peninsula, Alaska, in the Context of a Changing World [PDF]
, 2016 As climate change impacts increase so does our need to understand their effects on ecosystem dynamics. I studied Gyrfalcon (Falco rusticolus) diet during the brood rearing period to improve our knowledge on dietary habits during nesting, and provide ...
Robinson, Bryce W.
core
Immature and mature sperm morphometry in fresh and frozen-thawed falcon ejaculates
, 2017 Sperm morphometry is one characteristic which may be useful in prediction of fertility and sperm freezability in a species. Knowledge of the sperm characteristics of the ejaculate and the morphometric descriptors is necessary to effectively develop sperm
M.C. Esteso +12 more
core +2 more sources
Due to climate change global temperatures are rising, which is particularly pronounced at higher latitudes. Therefore, it is important to investigate the resilience of northern ecosystems to these environmental changes.
Jan Eivind Østnes +2 more
core +1 more source