Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight ...

• Main Authors: Eriksen, Ane, Wabakken, Petter
• Format: Dataset
• Language: English
• Published: Dryad 2018
• Subjects: interference competition; vocal activity; Predators; prey; avian apex predators; water vole; white-tailed eagle; Bubo bubo; midnight sun; Haliaeetus albicilla; non-invasive; Arvicola amphibius; eagle owl; Arctic; Northern Norway; White-tailed eagle
• Online Access: https://dx.doi.org/10.5061/dryad.11g3s9t; https://datadryad.org/stash/dataset/doi:10.5061/dryad.11g3s9t

Circadian rhythms result from adaptations to biotic and abiotic environmental conditions that cycle through the day, such as light, temperature, or temporal overlap between interacting species. At high latitudes, close to or beyond the polar circles, uninterrupted midsummer daylight may pose a challenge to the circadian rhythms of otherwise nocturnal species, such as eagle owls Bubo bubo. By non‐invasive field methods, we studied eagle owl activity in light of their interactions with their main prey the water vole Arvicola amphibius, and their competitor the white‐tailed eagle Haliaeetus albicilla during continuous midsummer daylight on open, treeless islands in coastal Northern Norway. We evaluated circadian rhythms, temporal overlap, exposure, and spatial distribution. The owls maintained a nocturnal activity pattern, possibly because slightly dimmer light around midnight offered favourable hunting conditions. The eagles were active throughout the 24‐hour period as opposed to the strictly diurnal rhythm ... : Individual counts eagle owls, water voles and white-tailed eagles during continuous midsummer daylightCounts of eagle owls, water voles and white-tailed eagles collected non-invasively during continuous midsummer daylight near the Arctic Circle, at the Sleneset archipelago (66°21ʹN, 12°35ʹE) in coastal northern Norway.AllSpecies.csvVisual and acoustic eagle owl observation durint continuous midsummer daylightNumber of eagle owls observed visually and acoustically with different time lags. Data collected non-invasively during continuous midsummer daylight near the Arctic Circle, at the Sleneset archipelago (66°21ʹN, 12°35ʹE) in coastal northern Norway.CallsSeen.csv ...