摘要:

Variations in the temporal and spectral characters of advertisement calls by males of the foam-nesting treefrogRhacophorus arboreuswere studied. The advertisement calls had 2 to 6 notes. The interval between notes became longer within a single call. The interval between notes was negatively correlated with temperature but not correlated with body size (snout-vent length, body weight or mouth width). The frequency of a note became higher within a single call. Snout-vent length, body weight and mouth width were negatively correlated with the frequency. However, snout-vent length and body weight were correlated with the frequency of the call in different ways.

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753311

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Electromyograms (EMGs) of the timbal muscles were recorded during the calling songs and ‘protest songs’ (also referred to as alarm signals) in five species of cicadas:Cicada barbara lusitanica, Tettigetta josei, Tettigetta argentata, Tibicina quadrisignataandTympanistalna gastrica.

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753312

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The use of bat detectors to monitor bat activity is common. Although several papers have compared the performance of different brands, none have dealt with the effect of different habitats nor have they compared narrow- and broad-band detectors. In this study the performance of four brands of ultrasonic bat detector, including three narrowband and one broad-band model, were compared for their ability to detect a 40 kHz continuous sound of variable amplitude along 100 metre transects. Transects were laid out in two contrasting bat habitat types: grassland and forest. Results showed that the different brands of detector differed in their ability to detect the source in terms of maximum and minimum detectable distance of the source. The rate of sound degradation with distance as measured by each brand was also different. Significant differences were also found in the performance of different brands in open grassland versus deep forest. No significant differences were found within any brand of detector. Though not as sensitive as narrow-band detectors, broad-band models hold an advantage in their ability to identify species where several species are found sympatrically.

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753313

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753314

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753315

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753316

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753317

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753318

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753319

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1996.9753310

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor