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Richard A. Holland (2007): Orientation and navigation in bats: known
unknowns or unknown unknowns? Behav. Ecol. Sociobiol., 61(5), 653-660.
Abstract: Bats have been extensively studied with regard to their ability to
orient, navigate and hunt prey by means of echolocation, but almost nothing
is known about how they orient and navigate in situations such as migration
and homing outside the range of their echolocation system. As volant
animals, bats face many of the same problems and challenges as birds.
Migrating bats must relocate summer and winter home ranges over distances as
far as 2,000 km. Foraging bats must be able to relocate their home roost if
they range beyond a familiar area, and indeed circumstantial evidence
suggests that these animals can home from more than 600 km. However, an
extensive research program on homing and navigation in bats halted in the
early 1970s. The field of bird navigation has advanced greatly since that
time and many of the mechanisms that birds are known to use for navigation
were not known or widely accepted at this time. In this paper I discuss what
is known about orientation and navigation in bats and use bird navigation as
a model for future research in bat navigation. Technology is advancing such
that previous difficulties in studying orientation in bats in the field can
be overcome and so that the mechanisms of navigation in this highly mobile
animal can finally be elucidated.
J. M. Russ and P. A. Racey (2007): Species-specificity and individual
variation in the song of male Nathusius' pipistrelles (Pipistrellus
nathusii). Behav. Ecol. Sociobiol., 61(5), 669-677.
Abstract: Sequences of the advertisement calls produced by male Nathusius'
pipistrelles (Pipistrellus nathusii) during the autumn mating period were
recorded from individuals at two separate sites in Antrim, Northern Ireland,
in August 2004. Several male roosts were found at these sites in close
proximity to a single maternity roost, each containing approximately 200
adult females and their young. Analysis of measured parameters of four
identified call types revealed that there were significant differences in
call structure between sites and between individuals. Playback experiments,
performed outside the adult female and juvenile roost sites, comprised of
experimental advertisement call sequences of P. nathusii, Pipistrellus
pygmaeus and Pipistrellus pipistrellus and control sound recorded without
bats present (silence). Response was measured by simultaneously recording
ultrasound during playbacks and counting the number of echolocation pulses
identified as those of P. nathusii above a predetermined amplitude
threshold. Significantly greater numbers of P. nathusii echolocation pulses
were recorded during playback of male P. nathusii advertisement calls than
during playback of congeners' advertisement calls and control sound. The
number of echolocation pulses recorded was similar during playback of P.
pipistrellus and P. pygmaeus advertisement calls and silence. We suggest
that, due to call complexity, male P. nathusii advertisement calls should be
classified as 'song'. Species-specificity and individual variation suggests
that the songs of male P. nathusii have the potential to play a role in mate
attraction and mate assessment.
ERRATUM: Pablo D. Ribeiro, John H. Christy, Rebecca J. Rissanen and Tae Won
Kim (2007): Males are attracted by their own courtship signals. Behav. Ecol.
Sociobiol., 61(5), 823. (Original Article was published in 2006, Vol. 61 (1)
and can be found at: http://dx.doi.org/10.1007/s00265-006-0238-5 )
University of Vienna, Dept. of Behavioural Biology
Doctoral Student, Research Associate
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