|
|
Functions of different song types and song structures in songbirds
Pišvejcová, Iveta ; Petrusková, Tereza (advisor) ; Linhart, Otomar (referee)
In this review I summarize information about different types of song and its structures in which has been well documented their context of use. I have tried to find out, if there are some generally valid rules. The work is aimed at Passerines (Passeriformes) males living in the temperate zone. They sing the most intensively after their arrival on breeding grounds in early spring. Depending on a species and moreover an individual, the song might differ in structure, time and frequency parameters. Some species use complex songs, and change the way of its production according to attending audience. In such cases, the length and versatility of the song (the number and variability of syllables) may reflect the quality of a male. On the other hand some species with a simple song use different criteria to assess the singer quality. The individuals then differ in the way of song production or just in use of particular structures. For example, wide frequency range and length are considered to be energy-demanding for production, and so it could be a suitable indicator for a male quality. Short syllables produced at a faster rate can be not only production-demanding but can also indicate aggression. In general, we can estimate the function of a produced song according to "mating status" (before and after pairing) and...
|
|
|
Low-amplitude songs in songbirds
Belfín, Ondřej ; Petrusková, Tereza (advisor) ; Vokurková, Jana (referee)
Research of bird vocalisation has been remarkably growing in the past seventy years. However, most of the published papers focused on common high-amplitude vocalisation. Despite having researchers who considered the existence of another rare low-amplitude signal more than a century ago, low-amplitude songs were overlooked until the beginning of the 20th century. Additionally, authors still using terms for the description of this scarcely recorded vocalisations inconsistently, which makes the comparison of published papers difficult. In total, I found published notes describing the existence or function of low-amplitude songs in at least 45 species, with ten species having at least two different types. This review is providing evidence that low-pitch songs might be quite widespread but overlooked signals playing a role in male- male as well as male-female interactions. Moreover, it is possible to distinguish between several types of low-amplitude songs based on their structural resemblance to the primary song. Getting all together, I am providing new terminology that might be helpful for further conclusions and could be used in future research of this hidden phenomenon.
|
|
|
Functions of different song types and song structures in songbirds
Pišvejcová, Iveta ; Petrusková, Tereza (advisor) ; Linhart, Otomar (referee)
In this review I summarize information about different types of song and its structures in which has been well documented their context of use. I have tried to find out, if there are some generally valid rules. The work is aimed at Passerines (Passeriformes) males living in the temperate zone. They sing the most intensively after their arrival on breeding grounds in early spring. Depending on a species and moreover an individual, the song might differ in structure, time and frequency parameters. Some species use complex songs, and change the way of its production according to attending audience. In such cases, the length and versatility of the song (the number and variability of syllables) may reflect the quality of a male. On the other hand some species with a simple song use different criteria to assess the singer quality. The individuals then differ in the way of song production or just in use of particular structures. For example, wide frequency range and length are considered to be energy-demanding for production, and so it could be a suitable indicator for a male quality. Short syllables produced at a faster rate can be not only production-demanding but can also indicate aggression. In general, we can estimate the function of a produced song according to "mating status" (before and after pairing) and...
|
guest ::
