Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight
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 chall...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/10255/dryad.181284 https://doi.org/10.5061/dryad.11g3s9t |
id |
ftdryad:oai:v1.datadryad.org:10255/dryad.181284 |
---|---|
record_format |
openpolar |
spelling |
ftdryad:oai:v1.datadryad.org:10255/dryad.181284 2023-05-15T14:25:43+02:00 Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight Eriksen, Ane Wabakken, Petter Norway Western Palearctic Coastal Northern Norway 2018-05-25T18:39:04Z http://hdl.handle.net/10255/dryad.181284 https://doi.org/10.5061/dryad.11g3s9t unknown doi:10.5061/dryad.11g3s9t/1 doi:10.5061/dryad.11g3s9t/2 doi:10.1111/jav.01781 doi:10.5061/dryad.11g3s9t Eriksen A, Wabakken P (2018) Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight. Journal of Avian Biology 49(7): e01781. http://hdl.handle.net/10255/dryad.181284 activity avian apex predators circadian rhythms eagle owl interference competition midnight sun non-invasive predators prey vocal activity water vole white-tailed eagle Article 2018 ftdryad https://doi.org/10.5061/dryad.11g3s9t https://doi.org/10.5061/dryad.11g3s9t/1 https://doi.org/10.5061/dryad.11g3s9t/2 https://doi.org/10.1111/jav.01781 2020-01-01T16:09:59Z 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 reported elsewhere, thus increasing temporal overlap and the potential for interference competition between the two avian predators. This may indicate an asymmetry, with the owls facing the highest cost of interference competition. The presence of eagles combined with constant daylight in this open landscape may make the owls vulnerable to interspecific aggression, and contrary to the available literature, eagle owls rarely exposed themselves visually during territorial calls, possibly to avoid detection by eagles. We found indications of spatial segregation between owls and eagles reflecting differences in main prey, possibly in combination with habitat‐mediated avoidance. Eagle owl vocal activity peaked in the evening before a nocturnal peak in visual observations, when owls were active hunting, consistent with the hypothesis of a dusk chorus in nocturnal bird species. The owls may have had to trade‐off between calling and foraging during the few hours around midnight when slightly dimmer light reduced the detection risk while also providing better hunting conditions. Article in Journal/Newspaper Arctic Arctic Bubo bubo Haliaeetus albicilla Northern Norway White-tailed eagle midnight sun Dryad Digital Repository (Duke University) Arctic Norway |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
activity avian apex predators circadian rhythms eagle owl interference competition midnight sun non-invasive predators prey vocal activity water vole white-tailed eagle |
spellingShingle |
activity avian apex predators circadian rhythms eagle owl interference competition midnight sun non-invasive predators prey vocal activity water vole white-tailed eagle Eriksen, Ane Wabakken, Petter Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
topic_facet |
activity avian apex predators circadian rhythms eagle owl interference competition midnight sun non-invasive predators prey vocal activity water vole white-tailed eagle |
description |
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 reported elsewhere, thus increasing temporal overlap and the potential for interference competition between the two avian predators. This may indicate an asymmetry, with the owls facing the highest cost of interference competition. The presence of eagles combined with constant daylight in this open landscape may make the owls vulnerable to interspecific aggression, and contrary to the available literature, eagle owls rarely exposed themselves visually during territorial calls, possibly to avoid detection by eagles. We found indications of spatial segregation between owls and eagles reflecting differences in main prey, possibly in combination with habitat‐mediated avoidance. Eagle owl vocal activity peaked in the evening before a nocturnal peak in visual observations, when owls were active hunting, consistent with the hypothesis of a dusk chorus in nocturnal bird species. The owls may have had to trade‐off between calling and foraging during the few hours around midnight when slightly dimmer light reduced the detection risk while also providing better hunting conditions. |
format |
Article in Journal/Newspaper |
author |
Eriksen, Ane Wabakken, Petter |
author_facet |
Eriksen, Ane Wabakken, Petter |
author_sort |
Eriksen, Ane |
title |
Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
title_short |
Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
title_full |
Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
title_fullStr |
Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
title_full_unstemmed |
Data from: Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
title_sort |
data from: activity patterns at the arctic circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight |
publishDate |
2018 |
url |
http://hdl.handle.net/10255/dryad.181284 https://doi.org/10.5061/dryad.11g3s9t |
op_coverage |
Norway Western Palearctic Coastal Northern Norway |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Arctic Bubo bubo Haliaeetus albicilla Northern Norway White-tailed eagle midnight sun |
genre_facet |
Arctic Arctic Bubo bubo Haliaeetus albicilla Northern Norway White-tailed eagle midnight sun |
op_relation |
doi:10.5061/dryad.11g3s9t/1 doi:10.5061/dryad.11g3s9t/2 doi:10.1111/jav.01781 doi:10.5061/dryad.11g3s9t Eriksen A, Wabakken P (2018) Activity patterns at the Arctic Circle: nocturnal eagle owls and interspecific interactions during continuous midsummer daylight. Journal of Avian Biology 49(7): e01781. http://hdl.handle.net/10255/dryad.181284 |
op_doi |
https://doi.org/10.5061/dryad.11g3s9t https://doi.org/10.5061/dryad.11g3s9t/1 https://doi.org/10.5061/dryad.11g3s9t/2 https://doi.org/10.1111/jav.01781 |
_version_ |
1766298163268812800 |