Behavioral Ecology and Sociobiology

, Volume 65, Issue 9, pp 1715–1720 | Cite as

Cannibalism in the lifeboat — collective movement in Australian plague locusts

  • Matthew J. Hansen
  • Jerome Buhl
  • Sepideh Bazazi
  • Stephen J. Simpson
  • Gregory A. Sword
Original Paper

Abstract

Mass migration of locusts is an economically devastating and poorly understood phenomenon. Locust mass migration often follows rapid population growth because individuals must move to find new sources of locally depleted resources. In Mormon crickets and Desert locusts, cannibalistic interactions have been revealed as the driving force behind collective mass movement. Locusts are known to compensate for nutrient deficiencies and they themselves are a good source of nutrients such as protein. However, direct empirical evidence for an adaptive benefit of cannibalism in migratory bands has been lacking. Here, we first show that Australian plague locusts, Chortoicetes terminifera, will cannibalise vulnerable conspecifics to compensate for protein deprivation, supporting the notion that cannibalistic interactions among nutritionally deprived individuals drives collective mass movement. We then show that individuals in a group with the opportunity to cannibalise survive longer and move more than individuals without the opportunity to cannibalise. These results provide empirical support for the ‘lifeboat mechanism’, which proposes that cannibalism offers the dual benefits to individuals in a group of surviving longer and travelling farther than a solitary individual without the opportunity to cannibalise.

Keywords

Cannibalism Australian plague locust Chortoicetes terminifera Collective movement Nutrition Migration 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Matthew J. Hansen
    • 1
  • Jerome Buhl
    • 1
  • Sepideh Bazazi
    • 2
  • Stephen J. Simpson
    • 1
  • Gregory A. Sword
    • 1
    • 3
  1. 1.School of Biological SciencesThe University of SydneySydneyAustralia
  2. 2.Department of ZoologyUniversity of OxfordOxfordUK
  3. 3.Department of EntomologyTexas A&M UniversityCollege StationUSA

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