BioAcoustica is a free, open repository of wildlife sound recordings from the Natural History Museum, London.
Taxonomic index of the BioAcoustica collection
Acoustic and biological measurements in the BioAcoustica collection
Recording annotations from ann-o-mate
The specimens that recordings are of, from the collections
Where the specimens that recordings are of were collected, not where the sound was recorded
| 897:12 Conocephalus dorsalis (70) | 6:35 · David R. Ragge; J. F. Burton; G. F. Wade |
| 102_9_Conocephalus dorsalis | 1:53 · David R. Ragge |
| 565_4_Conocephalus dorsalis | 1:11 |
| Conocephalus dorsalis | 0:20 |
| lab recording, September 1973, 22°C (Uher 4000 Report with Uher M53, tape no. CS_U07G, 500 Hz high pass filter) | 0:24 |
| lab recording, 29.7.2016, 26°C (Rolan R-05 recorder) |
| Conocephalus (Anisoptera) dorsalis | GB · 1962-08-01 · David R. Ragge; J. F. Burton |
| Conocephalus (Anisoptera) dorsalis | AT |
| Ahlén, Ingemar (1981). Ultraljud hos svenska vårtbitare. Entomologisk Tidskrift, 102: 27-41. |
The male calling song, produced mainly during the daytime, consists of long bursts (lasting up to 2 minutes or more) of a faint sound made up of two alternating components following each other without pause. One component is an echeme-sequence with a rustling quality, composed of tetrasyllabic echemes repatead at the rate of about 11-17/s; the other is a rapid ticking sound composed of single syllables repeated at the rate of about 15-30/s, with the repetion rate often becoming slower during the period of ticking. Each echeme-sequence usually lasts between 2 and 10 s, but longer sequences of up to 30 s or more occassionally occur. The periods of ticking are on average shorter, usually lasting between 1 and 5s, but there are occassionally longer bursts (up to 20 s or more), especially at the beginning or end of a period of continuous singing. Oscillographic analysis shows that each echeme of the rustling component of the song consists of four very similar diplosyllables (in contrast to the less uniform trisyllabic echemes of C. discolor). The first opening hemisyllable and the last closing hemisyllable of each echeme are usually slightly longer than the interveningones, each of which lasta about 10-13 ms. Within each echeme the intervals between successive syllables are about 2-3 ms and the whole echeme lasts about 50-65 ms; successive echemes are separated by an interval of about 6-15 ms. The ticking component of the song is composed of diplosyllables very similar to those forming the ticking components of the song of C. discolor.
The song is softer than in the Long-winged conehead, and is composed of two quite different, regularly alternating sounds. A uniform buzzing alternates from time to time with a distinctly deeper, rather stuttering song: 'rrrrr-ttttt-rrrrr-ttttt...'.
Kaislahepokatin kutsulaulu on vaikeimmin kuultavissa kotimaisista lajeista. Ääni on hyvin korkea ja peittyy ympäristön ääniin, ellei ole tyyntä ja hiljaista. Vain todella tarkkakuuloinen kykenee kuulemann kaislahepokation 1-2 metriä kauempaa ja monet eivät ollenkaan. Äänen voimakkuuden huippu on noin 35 kHz: n taajuudessa kaukana ihmisen kuuloalueen ulkopuolella. Pitkäkestoisessa kutsulaulussa (CD2) on kahdenlaisia jaksoja: hyvin tiheää ja rätisevää sitiystä seuraa tikittävä ja hieman hitaampi jakso. Nämä kaksi vaihetta vuorottelevat muutaman sekunnin väliajoin ilman taukoja niin, että tikittävä vaihe on yleensä kestoltaan lyhyempi. Kutsulaulun kokonaiskesto on yleensä alle kaksi minuuttia. Joutuessaan toistensa lähietäisyydelle koiraat saattavat kääntää peräpäänsä vastatusten ja alkaa soitta kilpaa (CD38). Tämäkin ääni on heikko mutta kutsulaulua katkonaisempi ja aggressiivisempi. Laji sirittää pääasiassa päiväaikaan.
The males stridulate for most of the day, with a song that superficially resembles that of the long-winged conehead. The sound is produced in prolonged, continuous bursts, but the more high-pitched 'chugging' (described as a 'hiss' by those who can hear it without the aid of a bat detector) alternates at irregular intervals with a lower-pitched 'clicking' sound (see DVD). This may be produced by alternately speeding up and slowing down the rate of vibration of the tegmina.