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Small passerines can discriminate ultraviolet surface colours
1Department of Biology and Chemistry, Orekhovo-ZuevoPedagogical Institute, Moscow, Russia.
Vision Research
|June 1, 1994
Summary
Hollow-dwelling birds can discriminate UV surface colors. This ability aids them in locating their nests, even when visual cues change, demonstrating a crucial adaptation for survival.
Area of Science:
- Ornithology
- Animal Behavior
- Sensory Ecology
Background:
- Passerine birds, such as pied flycatchers, great tits, and tree sparrows, are cavity nesters.
- Parental care in birds involves foraging and returning food to nestlings, a behavior that requires accurate nest-site recognition.
Purpose of the Study:
- To investigate the capacity of hollow-dwelling passerine birds to discriminate ultraviolet (UV) surface colors.
- To determine if UV color discrimination plays a role in nest-finding behavior under varying conditions.
Main Methods:
- Experiments were conducted in the wild using breeding pairs of pied flycatchers, great tits, and tree sparrows.
- A double nesting-box design was employed, with entrances marked by papers of varying UV reflectance.
- Birds were trained to distinguish between UV-absorbing and neutral marks, with human observers perceiving all marks as achromatic.
Main Results:
- Birds successfully learned to discriminate between UV-absorbing and neutral marks.
- The acquired habit of searching for the UV-absorbing mark was transferred to new marks with subtle lightness differences, indicating reliance on UV cues.
- This suggests that UV reflectance is a significant factor in their nest-finding strategy.
Conclusions:
- Hollow-dwelling passerine birds possess the ability to discriminate UV surface colors.
- UV color discrimination is an important factor in nest recognition for these birds, aiding in locating nests under challenging environmental conditions.