摘要:

According to their different functional contexts and accompanying visual displays, the coos of the collared doveStreptopelia decaoctocan be classified into three different types. This study examined whether these coo types also differ in acoustic characteristics. A large set of temporal, frequency and amplitude characteristics was measured to determine intra-individual variation within and between the coo types. Discriminant function analyses revealed that temporal parameters were best at discriminating between the coo types. Combined with the known variation in context and visual displays a strong case can be made that the coo types of the collared dove are likely to convey different information. Comparison of intra-individual variation within and between the coo types revealed clear differences between the acoustic parameters. The fundamental frequency, which is probably primarily determined by syrinx structure, was a very stable parameter. The amplitude of coos, which may depend on the activity of the abdominal muscles, was highly variable, but did not vary systematically between the coo types. Most temporal features were stable within a coo type, but varied significantly between coo types.

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753415

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Although chorusing behaviour has been reported previously in six species of corixid water bugs, including one European species ofMicronecta, no analysis of chorusing has been published forMicronecta.Studies of a large pond in SE Australia show that chorusing occurred in the most common species ofMicronectain the study area,M. concordia.Pulse-trains synchronized with those of other individuals nearby were the predominant acoustic output ofM. concordiamales throughout the stridulating season, from mid-winter to mid-summer. At the start of the season, chorusing began with an exponential increase in the percentage of synchronized signals over a period of six days.

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753416

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The pattern of song activity during different stages of the breeding cycle was investigated in males of the lesser whitethroatSylvia curruca.Males had a high song output during the prefertile period after which the song activity declined abruptly. This pattern is consistent with the song functioning in territory defence and mate attraction. Most males did not sing when their mate was fertile. It is suggested that this silence is a strategy by which the male tries to conceal the precise position of the fertile mate to avoid being cuckolded.

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753417

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Properties of the tonal calls of cetaceans are summarised and compared at the species level. Statistics are presented relating to start, end, minimum, maximum and centre frequencies, duration and number of inflections, together with information about recordings (location, number encounters/groups, length of recordings). Evidence of a linear relation between body-size and wavelength is given for odontocetes (R2between 0.68 and 0.93, depending on frequency variable and least-squares method) but the relationship does not appear to fit well for mysticetes (R2= 0.64). Results of preliminary investigations into acoustic discrimination of species by multivariate methods are also presented: a simple classifier for 10 species based on results derived from the literature gave a correct classification rate of 28% when tested with independent data. Some methodological recommendations for future descriptive work on cetacean acoustics are made.

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753418

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753419

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753420

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753421

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753422

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.1999.9753414

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor