, Volume 100, Issue 9, pp 895–898 | Cite as

Bechstein’s bats maintain individual social links despite a complete reorganisation of their colony structure

  • A. Baigger
  • N. Perony
  • M. Reuter
  • V. Leinert
  • M. Melber
  • S. Grünberger
  • D. Fleischmann
  • G. KerthEmail author
Short Communication


Several social mammals, including elephants and some primates, whales and bats, live in multilevel societies that form temporary subgroups. Despite these fission–fusion dynamics, group members often maintain long-term bonds. However, it is unclear whether such individual links and the resulting stable social subunits continue to exist after a complete reorganisation of a society, e.g. following a population crash. Here, we employed a weighted network analysis on 7,109 individual roosting records collected over 4 years in a wild Bechstein’s bat colony. We show that, in response to a strong population decline, the colony’s two stable social subunits fused into a non-modular social network. Nevertheless, in the first year after the crash, long-term bonds were still detectable, suggesting that the bats remembered previous individual relationships. Our findings are important for understanding the flexibility of animal societies in the face of dramatic changes and for the conservation of social mammals with declining populations.


Fission–fusion Multilevel social networks Population crash Social bonds 



We thank Sebastien Puechmaille and Danilo Russo for comments on the manuscript. This study was carried out under license from the nature conservancy department of Lower Franconia. The German Science Foundation (DFG, KE 746/4-1) provided financial support.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • A. Baigger
    • 1
  • N. Perony
    • 2
  • M. Reuter
    • 3
  • V. Leinert
    • 4
  • M. Melber
    • 5
  • S. Grünberger
    • 6
  • D. Fleischmann
    • 5
  • G. Kerth
    • 5
    Email author
  1. 1.Transfusion MedicineHannover Medical SchoolHannoverGermany
  2. 2.Chair of Systems DesignETH ZurichZurichSwitzerland
  3. 3.Behavioral Physiology and Sociobiology, BiocenterUniversity of WürzburgWürzburgGermany
  4. 4.Behavioral BiologyUniversity of OsnabrueckOsnabrückGermany
  5. 5.Zoological Institute and MuseumGreifswald UniversityGreifswaldGermany
  6. 6.Animal Ecology and Tropical Biology, BiocenterUniversity of WürzburgWürzburgGermany

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