Insectes Sociaux

, Volume 32, Issue 3, pp 305–312 | Cite as

Crest-line orientation inCamponotus pennsylvanicus (DeGeer)

  • J. H. Klotz
  • S. L. Cole
  • H. R. Kuhns


We tested two hypotheses about the mechanism of crest-line trailing in the carpenter ant,Camponotus pennsylvanicus (DeGeer): (1) the slope hypothesis says that the ant turns back toward the crest-line whenever a critical downslope is encountered (geoclinotais); (2) the displacement hypothesis says that the oscillation around the crestline has an intrinsically specified amplitude. Inthe experiments, the ants shuttled between the nest and a feeding station running across the tops of cylinders of variable diameter. This was done under both high and low light intensity. The amplitudes of the oscillations correlate positively with the diameters of the cylindrical substrate, which supports the first hypothesis.


Light Intensity Variable Diameter Displacement Hypothesis Cylindrical Substrate Camponotus Pennsylvanicus 

Die Grat-Orientierung vonCamponotus pennsylvanicus (DeGeer)


Wir prüften zwei Erklärungsprinzipien für den Mechanismus des Gratwanderns bei der AmeiseCamponotus pennsylvanicus (DeGeer): (1) Nach der Reizhypothese wendet die Ameise bei einem kritischen Hangwinkel hangaufwärts (Geoklinotaxis). (2) Nack der Spontanhypothese pendelt die gratwandernde Ameise mit selbstbestimmer Amplitude beidseitig um den Grat. Im Experiment unter starker und schwacher Beleuchtung liefen die Ameisen über Zylinder variablen Durchmessers zwischen Nest und Futterstelle. Die beobachtete positive Korrelation zwischen der Pendelamplitude und dem Zylinderdurchmesser belegt die erste Hypothese.


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Copyright information

© Masson 1985

Authors and Affiliations

  • J. H. Klotz
    • 1
  • S. L. Cole
    • 2
  • H. R. Kuhns
    • 3
  1. 1.Departement of EntomologyUniversity of KansasLawrenceU.S.A.
  2. 2.Mid-America Nazarene CollegeOlatheU.S.A.
  3. 3.University of Kansas School of MedicineWichitaU.S.A.

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