Avian Escape and Prevailing Light Levels Article Swipe
Michael A. Weston
,
Kaori Yokochi
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/birds6030047
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/birds6030047
Anti-predator behaviour in birds is required by day and night but has barely been studied at night. For prey which detect predators visually, low light levels may diminish detection or monitoring of approaching threats. We conducted standardised approaches to Silver Gulls (Chroicocephalus novaehollandiae) by day and night along an urban foreshore in Melbourne, Australia, measuring light levels (Lux) experienced by the gull, Flight-initiation Distance (FID; the distance at which escape is initiated), and Starting Distance (the initial distance between the observer and the bird). We fitted models reflecting different conceptual possibilities for the relationship between Lux and FID. Support existed for a model with a stepwise effect of light on FID. Longer FIDs (i.e., earlier escape) in darker conditions suggest that gulls can detect an approaching threat in darkness at least as well as by day, but the tolerance of closer approaches may be diminished in dull and dark conditions, perhaps due to difficulty in monitoring an approaching threat and/or because nighttime represents a time of greater predator risk. Starting Distance was positively related to FID, a result commonly reported for many taxa by day.
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- en
- Landing Page
- https://doi.org/10.3390/birds6030047
- https://www.mdpi.com/2673-6004/6/3/47/pdf?version=1756993286
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All OpenAlex metadata
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Avian Escape and Prevailing Light LevelsWork title
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2025Year of publication
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2025-09-04Full publication date if available
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Michael A. Weston, Kaori YokochiList of authors in order
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https://doi.org/10.3390/birds6030047Publisher landing page
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https://www.mdpi.com/2673-6004/6/3/47/pdf?version=1756993286Direct link to full text PDF
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goldOpen access status per OpenAlex
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GeographyTop concepts (fields/topics) attached by OpenAlex
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