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Echolocation behaviours of the Japanese pipistrelle bat Pipistrellus abramus during foraging flight

100%

Ma J., Jones G., Zhu G., Metzner W.

Acta Theriologica

2010

tom 55

nr 4

The acoustic structure of echolocation pulses emitted by Japanese pipistrellePipistrellus abramus (Temminck, 1840) bats during different phases of aerial hawking is described here for the first time. Behavioural observations of the foraging flight in conjunction with acoustical analysis of echolocation pulses indicated a flight path consisting of four distinct phases following the reconnaissance or search phase. Short (∼4.68 ms) and relatively broadband frequencymodulated (FM) pulses (∼23.55 kHz bandwidth) were emitted at a repetition rate of 15 Hz during presumed target approach. Presumed insect capture consisted of an early and a late buzz phase. Both buzz types were emitted at high repetition rates (111 Hz in early to 222 Hz in late) and consisted of very short, broadband FM pulses (1.26 ms in early to 0.3 ms in late). There was also a characteristically sharp drop in both the peak and terminal frequencies of each echolocation pulse during the transition from early to late buzz. No pulses were recorded during the final phase of foraging referred to as a “post-buzz pause”. Thus the foraging behaviour of this species consisted of five sequential phases involving four broad types of echolocation pulses.

The vocal repertoire of two sympatric species of nectar-feeding bats (Glossophaga soricina and G. commissarisi)

100%

Knornschild M., Glockner V., Von Helversen O.

Acta Chiropterologica

2010

tom 12

nr 1

We recorded social vocalizations from two sympatric species of glossophagine bats, Glossophaga soricina and G. commissarisi, using habituated captive groups that were housed in separate flight cages. Whenever possible, the species-specific vocalization types were described in the light of the social context in which they were produced. Several vocalization types within each species' repertoire had remarkable similarities to vocalization types in the other species' repertoire. Out of these, four vocalization types with interspecific acoustic similarities (approach pulses, distress calls, aggressive trills, and alert calls) were used in similar behavioral contexts in both species. Approach pulses were produced whenever a bat was flying towards an already occupied roost. Distress calls were uttered whenever a bat was attacked by conspecifics or restrained by the observer, whereas aggressive trills were produced during aggressive encounters prior to physical contact. Alert calls were uttered when bats were disturbed or when several individuals were circling the same location. The interspecific similarity of both the social context and the acoustic structure of vocalization types suggest that the potential for interspecific communication is high in G. soricina and G. commissarisi.

Ograniczanie wyników

1 Acta Chiropterologica

1 Acta Theriologica

1 Glockner V.

1 Jones G.

1 Knornschild M.

1 Ma J.

1 Metzner W.

1 Von Helversen O.

1 Zhu G.

2 2010

Wyniki wyszukiwania

Echolocation behaviours of the Japanese pipistrelle bat Pipistrellus abramus during foraging flight

The vocal repertoire of two sympatric species of nectar-feeding bats (Glossophaga soricina and G. commissarisi)