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Related Concept Videos

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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Photoreceptors and Plant Responses to Light

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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...

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Is the ultraviolet waveband a special communication channel in avian mate choice?

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Related Experiment Video

Updated: Jun 30, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
08:33

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Published on: February 26, 2016

Avian ultraviolet vision and frequency-dependent seed preferences.

S C Church1, A S Merrison, T M Chamberlain

  • 1Ecology of Vision Research Group, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK. s.c.church@bristol.ac.uk

The Journal of Experimental Biology
|August 21, 2001
PubMed
Summary

Ultraviolet light significantly impacts bird foraging behavior, influencing seed selection in zebra finches. This suggests ultraviolet wavelengths may play a crucial role in plant population dynamics.

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Area of Science:

  • Avian vision
  • Behavioral ecology
  • Sensory biology

Background:

  • Ultraviolet (UV) sensitivity is crucial for bird visually-guided behaviors, including foraging for various food sources.
  • UV wavelengths are utilized by birds when searching for insects, berries, seeds, and even small mammals.

Purpose of the Study:

  • To investigate the impact of removing UV wavelengths versus human-visible wavelengths on seed selection in zebra finches.
  • To determine the role of UV light in frequency-dependent seed preferences.

Main Methods:

  • Two laboratory experiments were conducted using zebra finches (Taeniopygia guttata).
  • The experiments involved removing specific light wavebands (UV and human-visible) to observe effects on seed preference.
  • Seed and background reflectance properties were controlled, primarily reflecting long wavelengths.

Main Results:

  • Removal of UV wavelengths significantly altered the strength and direction of frequency dependence in seed selection compared to full-spectrum light.
  • UV wavelength removal (300-400 nm) had a comparable effect on frequency dependence strength as removing short (400-500 nm), medium (500-600 nm), or long (600-700 nm) wavelengths.
  • The study controlled for seed and background reflectance, which mainly occurred in the long-wavelength spectrum.

Conclusions:

  • UV wavelengths appear to play a significant role in frequency-dependent seed selection by birds.
  • These findings suggest UV light could influence plant population dynamics.
  • Caution is advised against overemphasizing UV wavelengths compared to those in the human-visible spectrum for avian foraging.