摘要:

The theory of communication networks offers functional arguments for the evolution of unobtrusive signals in birds. The vulnerability of interacting conspecifics to predation and to eavesdropping by neighbours during both territorial disputes and courtship would select for short range signals such as the quiet songs of birds. In addition to suggesting contexts in which quiet songs should be used, we use our knowledge of the physics of sound transmission to make predictions about the physical structure of such songs relative to the well studied full songs. We present support for these predictions in six species where quiet singing has been observed.

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753385

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

We introduce an inexpensive electronic technique for monitoring the temporal aspects of any captive animal's acoustic signals. The electronic apparatus, attached to a data acquisition unit and personal computer, compares microphone output to a pre-set level and stores calling/non-calling data to disk. Total time calling and temporal signaling patterns of up to 256 individuals can be monitored for indefinite lengths of time. Sampling rate is adjustable, with a maximum rate of 6 samples/microphone/second. The capabilities of the system are illustrated with the field cricketGryllus integer.Temporal aspects of acoustic signaling are discussed in terms of monitoring time scale and recognition of individual variation, energetics research, and hypothesis testing of the costs and benefits associated with mating success and predation.

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753386

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The paper gives an overview of the capacities of the software solutions for a sound analysis system based on the program development environment LabVIEW and shows some applications of the system by using suckling grunts of domestic pigsSus scrofaas an example.

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753387

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Male corncrakesCrex crexproduce repetitive calls the elements of which are composed of individual pulses. The inter-pulse intervals were measured for elements of calls from ten birds recorded on one to three nights. The abilities of discriminant analysis and two artificial neural nets to correctly attribute calls to birds across nights, using sets of vectors of inter-pulse intervals, were compared. Discriminant analysis correctly attributed all calls to the correct individual without error. One of the two neural nets incorrectly attributed less than 1% of calls. Using coded data the second neural net incorrectly attributed less than 6% of calls overall but the individual error rate varied between zero and more than 50%.

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753388

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753389

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753390

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753391

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753392

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1998.9753384

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor