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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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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.
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What is a Frequency Distribution00:51

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A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
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Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
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Muscle Stimulation Frequency01:22

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Frequency Response of BJT01:24

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The frequency response of a Bipolar Junction Transistor (BJT) in a common-emitter configuration is critical to its functionality, especially in applications involving amplification of alternating current (AC) signals. This response can be analyzed through low-frequency and high-frequency equivalent circuits, considering various internal parameters and external conditions.
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Load-frequency control01:28

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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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High-frequency vocalizations in Andean hummingbirds.

Fernanda G Duque1, Carlos A Rodríguez-Saltos2, Walter Wilczynski1

  • 1Neuroscience Institute, Center for Behavioral Neuroscience, Georgia State University, Atlanta, GA 30302, USA.

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High-frequency vocalizations, previously unknown in many hummingbird species, have been discovered in four Andean species. This suggests these unique bird sounds may have been overlooked in scientific research.

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Area of Science:

  • Ornithology
  • Bioacoustics
  • Animal Communication

Background:

  • Hummingbirds exhibit unique biological traits.
  • Previous research identified high-frequency vocalizations in the Black Jacobin hummingbird.
  • The hearing range of birds typically excludes these high frequencies.

Discussion:

  • Four Andean hummingbird species, Ecuadorian Hillstar, Buff-tailed Coronet, Speckled Hummingbird, and Violet-tailed Sylph, exhibit high-frequency vocalizations.
  • The Ecuadorian Hillstar (Oreotrochilus chimborazo) produced the highest fundamental frequency at 13.4 kHz.
  • The presence of these vocalizations across different hummingbird lineages suggests they may have been previously overlooked.

Key Insights:

  • High-frequency vocalizations are present in multiple hummingbird lineages, not just the Black Jacobin.
  • Vocalizations of cloud-forest dwelling Andean hummingbirds appear adapted to their specific acoustic environments.
  • The evolutionary pressures and functional significance of these high-frequency sounds in hummingbirds remain undetermined.

Outlook:

  • Further research is needed to understand the function and evolutionary drivers of high-frequency vocalizations in hummingbirds.
  • Investigating the auditory perception capabilities of these hummingbird species is crucial.
  • Comparative studies across a wider range of hummingbird species and habitats will clarify the prevalence and evolution of these unique vocalizations.