2. Behavioral Biology TALKS - Deutsche Zoologische Gesellschaft

healthcare issues, alternative control methods are more and more important.
Sitophilate, the aggregation pheromone of S. granarius is not suitable as attractant
for monitoring and/or mass trapping of the beetles. Therefore, we report on the
development of new attractive lures. Bioassays in a static four-chamber olfactometer
combined with the video tracking software BioMotionTrack D.S. revealed that larval
faeces of S. granarius are attractive to both sexes of the weevil. In order to identify
the attractive compounds, extracts of the larvae faeces were fractionated and
attractive fractions analysed by GC-MS. The identification of attractive substances
from the faeces might help to develop new lures to control these pest organisms.
����49 Frauke Krüger
Eco-morphology of trawling Myotis’
Authors: Frauke Krüger 1 , Stefan Greif, Sandor Zsebok, Robert Sommer, Björn Siemers
Affiliation: 1 Institute for Natural Resource Conservation
Morphology is crucial for foraging performance in bats. Especially in trawling bats the
ability to fly low over water, take and lift prey from or beneath the water surface and
to feed on prey of different size is likely to be limited by morphological adaptations.
Therefore we describe different morphological parameters, which are helpful in
discussing ecological niches and foraging ecology of trawling bats. Wing
measurements as well as bite force measurements were taken from live bats in the
field in northern Germany. Measurements of lifting performance were taken from
live bats under lab conditions. All results were correlated with dietary results for the
species in the same region. Despite significant morphological differences both species
showed high dietary overlap and similar niche breath. But differences regarding the
prey types, referring to the terrestrial or aquatic life-cycle of prey groups, seem to
support spatial segregation and different hunting preferences also indicated by
different morphological adaptations. High resource abundance is also likely to allow
the coexistence of both species´ within the same hunting habitat.
����50 Jan-Jakob Laux
Can insect eggs learn to fly? - Dispersal ecology and population genetics of reed
beetles (Genus: Macroplea)
Authors: Jan-Jakob Laux 1 , Gregor Kölsch
Affiliation: 1 Biocenter Grindel and Zoological Museum
Many freshwater invertebrates are - to lesser or greater extent - incapable to
disperse themselves actively over longer distances and therefore have to rely on
passive dispersal mechanisms.
Uniquely among the many species of leaf beetles, members of the genus Macroplea
are adapted to a completely aquatic lifestyle. Living in brackish and freshwater
habitats in inland lakes and the Baltic Sea, these beetles show strikingly little
potential for active dispersal. They are flightless, their comparatively weak legs don’t
carry their weight out of water and they are even unable to swim actively.
Details of the life cycle of the beetles and population genetic structure hint at
different mechanisms of passive dispersal for coastal and inland populations. While
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