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Projects

2. Food choice and direct competition in two Neotropical bat species, Carollia perspicillata and Carollia castanea

 

Futterwahl und direkte Konkurrenz zweier neotropischer Fledermausarten, Carollia perspicillata und Carollia castanea

 

Executives: PD Dr. Sabine Schmidt (953-8746), Ulrike Taron, BSc.

 

 

The Phyllostomidae are the largest, and a highly diverse, bat family in the Neotropics due to an adaptive radiation to different diets ranging from insects to small vertebrates, blood, fruit, pollen, nectar and blossoms. Two common, frugivorous bat species, C. perspicillata and C. castanea, occur sympatrically and feed both on Piperaceae in their natural habitat, which implies that they compete for the same food resources. The present project addresses the microhabitat use of C. perspicillata and C. castanea in order to investigate the mechanisms to avoid direct competition. We study food choice behaviour of both species focusing on the effects of food quantity and the accessibility of food resources. In addition we investigate the behaviour of both species in a direct competition situation.

 

Status: since April 2012

 

Keywords: Bats, etho-ecology, competition, foraging behaviour 

3. Acoustic communication during ritualised courtship in the Indian False Vampire Bat, Megaderma lyra

Bioakustik der Kommunikation

 

Executives: PD Dr. Sabine Schmidt (953-8746)

 

The song flight is a conspicuous flight manoeuvre accompanied by a complex song, which is directed by male M. lyra towards females. Song flights are composed of three parts characterised by distinct flight patterns and song strophes. This behaviour is highly ritualised and may play a role in courtship behaviour and a long-term binding of females. The present project focuses on the behaviour of the female during song flight and its effects on the male song. In particular, we study to which extent the reaction of the female affects the emotional state of the male as reflected in the acoustic prosody of the song.

 

Status: since April 2011

 

Support: DFG

 

Keywords: Bats, social interactions, acoustic communication

 

4. Evaluation of social calls in the Indian False Vampire bat, Megaderma lyra

Bewertung von Sozialrufen durch den Indischen Falschen Vampir, Megaderma lyra

 

Executives: PD Dr. Sabine Schmidt (953-8746), Dipl.-Biol. Hanna Kastein

 

Bats are nocturnal mammals which rely on acoustic information for their social organisation. Thus they are interesting models for comparative studies on the evolution of vocal communication. M. lyra has a rich repertoire of social calls which are used in specific behavioural contexts. In addition, social calls carry individual signatures and provide affect cues. The present project focuses on the categorisation of social calls by M. lyra in spontaneous, and habituation-dishabituation, playback experiments which allow to study reactions in the absence of visual displays. We analyse the evaluation of social calls on different levels, e.g. for different call types, or different affective contents within a call type. Furthermore, the approach is used to disclose a recognition of novelty, group identity and individuality by this species.

 

Status: since August 2004

 

Funding: DFG

 

Cooperation partners: Prof. Dr. K. Sripathi, School of Biological Sciences, Madurai Kamaraj University, Madurai, India

Dr. W.B. Yapa, Department of Zoology, University of Colombo, Sri Lanka

 

Keywords: Bats, acoustic communication, call recognition, call evaluation

 

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