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Martini (Carlo Maria) Nel cuore della Chiesa e del mondo. Dialogo con Antonio Balletto e Bruno Musso
No full textDurand Jean-Dominique. Martini (Carlo Maria) Nel cuore della Chiesa e del mondo. Dialogo con Antonio Balletto e Bruno Musso. In: Archives de sciences sociales des religions, n°80, 1992. p. 277
The Pied Piper: A Parasitic Beetle’s Melodies Modulate Ant Behaviours. Corresponding author
No full textAnts use various communication channels to regulate their social organisation. The main
channel that drives almost all the ants’ activities and behaviours is the chemical one, but it is
long acknowledged that the acoustic channel also plays an important role. However, very little
is known regarding exploitation of the acoustical channel by myrmecophile parasites to
infiltrate the ant society. Among social parasites, the ant nest beetles (Paussus) are obligate
myrmecophiles able to move throughout the colony at will and prey on the ants, surprisingly
never eliciting aggression from the colonies. It has been recently postulated that stridulatory
organs in Paussus might be evolved as an acoustic mechanism to interact with ants. Here,
we survey the role of acoustic signals employed in the Paussus beetle-Pheidole ant system.
Ants parasitised by Paussus beetles produce caste-specific stridulations. We found that
Paussus can “speak” three different “languages”, each similar to sounds produced by different
ant castes (workers, soldiers, queen). Playback experiments were used to test how host
ants respond to the sounds emitted by Paussus. Our data suggest that, by mimicking the
stridulations of the queen, Paussus is able to dupe the workers of its host and to be treated
as royalty. This is the first report of acoustic mimicry in a beetle parasite of ants
Cytological evidence for population-specific sex chromosome heteromorphism in Palaearctic green toads (Amphibia, Anura).
No full textA chromosome study was carried out on a number of European and Central Asiatic diploid green toad populations by means of standard and various other chromosome banding and staining methods (Ag-NOR-, Q-, CMA3-, late replicating [LR] banding pattern, C-and sequential C-banding + CMA3 + DAPI). This study revealed the remarkable karyological uniformity of specimens from all populations, with the only exception being specimens from a Moldavian population, where one chromosome pair was heteromorphic. Though similar in shape, size and with an identical heterochromatin distribution,the difference in the heteromorphic pair was due to a large inverted segment on its long arms. This heteromorphism was restricted to females, suggesting a female heterogametic sex chromosome system of ZZ/ZW type at a very early step of differentiation
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