Fast visual adaptation to dim light in a cavity-nesting bird
(2023) In Proceedings of the Royal Society B: Biological Sciences 290(1998).- Abstract
Many birds move fast into dark nest cavities forcing the visual system to adapt to low light intensities. Their visual system takes between 15 and 60 min for complete dark adaptation, but little is known about the visual performance of birds during the first seconds in low light intensities. In a forced two-choice behavioural experiment we studied how well budgerigars can discriminate stimuli of different luminance directly after entering a darker environment. The birds made their choices within about 1 s and did not wait to adapt their visual system to the low light intensities. When moving from a bright facility into an environment with 0.5 log unit lower illuminance, the budgerigars detected targets with a luminance of 0.825 cd m -2... (More)
Many birds move fast into dark nest cavities forcing the visual system to adapt to low light intensities. Their visual system takes between 15 and 60 min for complete dark adaptation, but little is known about the visual performance of birds during the first seconds in low light intensities. In a forced two-choice behavioural experiment we studied how well budgerigars can discriminate stimuli of different luminance directly after entering a darker environment. The birds made their choices within about 1 s and did not wait to adapt their visual system to the low light intensities. When moving from a bright facility into an environment with 0.5 log unit lower illuminance, the budgerigars detected targets with a luminance of 0.825 cd m -2 on a black background. When moving into an environment with 1.7 or 3.5 log units lower illuminance, they detected targets with luminances between 0.106 and 0.136 cd m -2. In tests with two simultaneously displayed targets, the birds discriminated similar luminance differences between the targets (Weber fraction of 0.41-0.54) in all light levels. Our results support the notion that partial adaptation of bird eyes to the lower illumination occurring within 1 s allows them to safely detect and feed their chicks.
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- author
- Chaib, Sandra LU ; Lind, Olle LU and Kelber, Almut LU
- organization
- publishing date
- 2023-05-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- budgerigar, cavity-nesting birds, contrast vision, dark-adaptation, vision, visual adaptation
- in
- Proceedings of the Royal Society B: Biological Sciences
- volume
- 290
- issue
- 1998
- article number
- 20230596
- publisher
- Royal Society Publishing
- external identifiers
-
- pmid:37161333
- scopus:85159646065
- ISSN
- 0962-8452
- DOI
- 10.1098/rspb.2023.0596
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2023 The Authors.
- id
- d017221c-006b-495a-bf1b-9d58a57c74c4
- date added to LUP
- 2024-09-06 12:56:35
- date last changed
- 2024-09-12 18:32:54
@article{d017221c-006b-495a-bf1b-9d58a57c74c4,
abstract = {{<p>Many birds move fast into dark nest cavities forcing the visual system to adapt to low light intensities. Their visual system takes between 15 and 60 min for complete dark adaptation, but little is known about the visual performance of birds during the first seconds in low light intensities. In a forced two-choice behavioural experiment we studied how well budgerigars can discriminate stimuli of different luminance directly after entering a darker environment. The birds made their choices within about 1 s and did not wait to adapt their visual system to the low light intensities. When moving from a bright facility into an environment with 0.5 log unit lower illuminance, the budgerigars detected targets with a luminance of 0.825 cd m -2 on a black background. When moving into an environment with 1.7 or 3.5 log units lower illuminance, they detected targets with luminances between 0.106 and 0.136 cd m -2. In tests with two simultaneously displayed targets, the birds discriminated similar luminance differences between the targets (Weber fraction of 0.41-0.54) in all light levels. Our results support the notion that partial adaptation of bird eyes to the lower illumination occurring within 1 s allows them to safely detect and feed their chicks.</p>}},
author = {{Chaib, Sandra and Lind, Olle and Kelber, Almut}},
issn = {{0962-8452}},
keywords = {{budgerigar; cavity-nesting birds; contrast vision; dark-adaptation; vision; visual adaptation}},
language = {{eng}},
month = {{05}},
number = {{1998}},
publisher = {{Royal Society Publishing}},
series = {{Proceedings of the Royal Society B: Biological Sciences}},
title = {{Fast visual adaptation to dim light in a cavity-nesting bird}},
url = {{http://dx.doi.org/10.1098/rspb.2023.0596}},
doi = {{10.1098/rspb.2023.0596}},
volume = {{290}},
year = {{2023}},
}