摘要:

Barnacle goose loud calls were recorded in a semi-captive flock in Slimbridge. A q uantitati ve analysis of those calls revealed a high degree of individuality in their structure. The duration and fundamental frequency of the calls did not vary much between birds, but the frequency of maximum amplitude did vary from one bird to another. No differences appeared between sexes. Individuality involved complex parameters that required special analysis programs. Frequency spectrum and frequency modulation (obtained by fundamental extraction) were individually distinctive. The combination of these two parameters gives excellent individual distinctiveness and enables 98% correct identification of the calls of individuals.

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753255

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The experimental removal of the females from 5 breeding pairs of starlings caused the males to change both the quantity and quality of song when compared with 6 unmanipulated control pairs. The increase in the duration and commonness of warbling song after mate removal supports the idea that this type of song functions as mate attraction and stimulation. In contrast, the species-specific whistled songs are more important after pairing, which supports the idea that they are more involved in male-male interactions.

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753256

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Bird song researchers have not agreed on a common set of units of analysis by which birds' songs of various different species might be described. Analysis of 50 papers reveals 28 unit designations and considerable variation in their application despite only three different methods for identifying units. The lack of consensus on units arises from the fact that units generated by the same methods at different levels of organization are given different names. A method for designating bird song units is offered for discussion which uses the concept of level of organization to stress the fundamental unanimity of method. It is hoped that consideration of this method will lead ultimately to greater standardization in the protocols by which researchers generate and name bird song units.

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753257

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The method usually used to identify different sounds or divisions of sounds is to compare sonagrams visually. There have been some attempts to reduce the subjectivity and increase the repeatability of this approach, for example by tracing the sonagrams onto paper and examining the areas of overlap and mismatch, the use of multi-variate statistics and digitising tablets. Digital recording of sounds has allowed sounds to be input directly into computers which can be used to display sounds and facilitate measurement. To date there has been little attempt at their use for analysis. We outline a series of programs which have been developed to compare statistically any unit of a sound with a pre-recorded library of similar units. The creation of such a library allows the rapid and objective categorisation of large numbers of sounds. These programs have been used to analyse songs recorded from wrensTroglodytes troglodytesand house cricketsAcheta domesticus.Potential applications of this software to the field of bioacoustic investigation are discussed.

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753258

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753259

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753260

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753261

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753262

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753263

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1994.9753264

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor