Ecological Sources of Selection on Avian Sounds

  title={Ecological Sources of Selection on Avian Sounds},
  author={E. Morton},
  journal={The American Naturalist},
  pages={17 - 34}
  • E. Morton
  • Published 1975
  • Biology
  • The American Naturalist
This study describes selection derived from habitat acoustics on the physical structure of avian sounds. Sound propagation tests were made in forest, edge, and grassland habitats in Panama to quantify pure tone and random noise band sound transmission levels. The sounds of bird species in each habitat were analyzed to determine the emphasized frequency, frequency range, and sound type (whether pure tonelike or highly modulated). Forest habitats differ from grass and edge in that a narrow range… Expand
A comparison of sound propagation and song frequency in temperate marsh and grassland habitats
Analysis of recorded songs of seven grassland and six marsh species indicated that minimum and emphasized frequency were significantly lower in songs of marsh birds, consistent with the ‘sound window' hypothesis of Morton. Expand
Dominant frequency of songs in tropical bird species is higher in sites with high noise pollution.
Noise pollution caused by the vehicular traffic and urbanization are correlates with changes in the vocalization of tropical birds in forest fragments and bird species that have differences in the dominant frequency can be used in environmental monitoring and in ethological studies, as they are sensitive to high noise levels. Expand
Habitat-dependent ambient noise: consistent spectral profiles in two African forest types.
  • H. Slabbekoorn
  • Environmental Science, Medicine
  • The Journal of the Acoustical Society of America
  • 2004
Many animal species use acoustic signals to attract mates, to defend territories, or to convey information that may contribute to their fitness in other ways. However, the natural environment isExpand
The low-frequency acoustic structure of mobbing calls differs across habitat types in three passerine families
Testing the predictions of the acoustic adaptation hypothesis with avian mobbing calls produced in closed, open and urban habitats in three families of passerine birds found that body size was important in duration and frequency measurements of mobbing call acoustic structure and Phylogeny explained acoustic variation in only some acoustic variables measured. Expand
Habitat Acoustics and the Low-Frequency Communication of Shallow Water Fishes
Many teleosts known to produce sounds during territorial and breeding activities live in coastal, transitional, or freshwater habitats characterised by shallow, or very shallow, water. TheExpand
Comparative effects of urban development and anthropogenic noise on bird songs
This is the first study to investigate how noise and urban development affect song frequency characteristics of multiple bird species, and found that minimum song frequency increased as noise level increased for 2 of 6 species, with 5 of6 species showing a strong trend in the predicted direction. Expand
High-frequency sound transmission in natural habitats: implications for the evolution of insect acoustic communication
Transmission and reception of high-frequency sound in the natural environment of bushcrickets was studied using the activity of an identified neuron in the insect's auditory pathway as a “biological microphone” to confirm the existence of two kinds of excess attenuation. Expand
Habitat type and density influence vocal signal design in satin bowerbirds.
Findings indicate that the transmission qualities of different habitats have had a major influence on variation in vocal phenotypes in this species, and there is no effect of genetic relatedness on call similarity among satin bowerbird populations. Expand
Habitat‐related differences in the frequency selectivity of auditory filters in songbirds
The results suggest that environmental constraints on song structure have influenced the evolution of peripheral auditory filters in songbirds, although species using signals not optimized for long-range transmission should be less affected. Expand
A global analysis of song frequency in passerines provides no support for the acoustic adaptation hypothesis but suggests a role for sexual selection
The results suggest that the global variation in passerine song frequency is mostly driven by natural and sexual selection causing evolutionary shifts in body size rather than by habitat-related selection on sound propagation. Expand


Sound Propagation in Homogeneous Deciduous and Evergreen Woods
The sound attenuation due to trees has been measured (under atmospheric conditions requiring no corrections) at about 20 locations, representing four selected types of woods. 9000 readings ofExpand
Modulation in bird sounds
This paper analyzes several bird vocalizations and interprets their patterns as the product of individual and interacting oscillators and sound modifying structures; it also suggests a model for the operation of the syrinx during sound production. Expand
Measurement of Environmental Factors in the Tropical Rain-Forest of Panama
The measurements upon which this report is based were made during January-March, I924, on Barro Colorado Island in Gatun Lake in the Canal Zone on the Isthmus of Panama. For purposes of comparisonExpand
Scattering by an Array of Cylinders as a Function of Surface Impedance
Plane waves are considered impinging at normal incidence on a half‐space (or slab of considerable thickness) containing a random array of cylinders. The average attenuation per unit distance withinExpand
Sound Propagation into the Shadow Zone in a Temperature‐Stratified Atmosphere above a Plane Boundary
The sound field in the “shadow zone” (diffraction region) formed over a plane boundary in an atmosphere with a constant vertical temperature gradient is analyzed both theoretically andExpand
Evolution of design features in the coding of species-specificity.
There is some degree of predictability in design features of signaling systems because of the physical laws regulating the transmission of signal energy, locatability, the functional properties of sensory organs, the physical characteristics of the habitats in which communication occurs, and prey-predator relationships. Expand
Tentative method for calculation of the sound field about a source over ground considering diffraction and scattering into shadow zones
Note presenting a semiempirical method for the calculation of the sound field about a source over ground considering the effects of vertical temperature and wind gradients as well as scattering ofExpand
A study of bird song
The authors may not be able to make you love reading, but study of bird song will lead you to love reading starting from now and will give you the kindness. Expand
Miscellaneous Collection 145:1-8
  • 1971
Un exemple de l'influence du milieu sur les emissions vocales des oiseaux: revolution de chants en forget equatoriale
  • Terre et Vie
  • 1971