ISSN:
1432-136X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Psammodes striatus, the ‘tok-tok’ beetle, communicates by substrate vibrations produced by tapping its abdomen on the ground. MaleP. striatus responded readily to computer-synthesized vibrations. Oxygen consumption rate ( $$\dot V_{O_2 } $$ ) of individual male beetles (n=3; mean mass 3.01 g) was continually recorded by computer before, during and after tapping communication with the computer, which also counted the beetle's replies. Standard $$\dot V_{O_2 } $$ of motionless beetles was also measured, during which time marked discontinuous ventilation was apparent. Since the relation between $$\dot V_{O_2 } $$ and tapping rate was linear, it was possible to estimate net cost of tapping (0.0279 μl O2 g−1 tap−1) and minimum cost of tapping (0.0286 μl O2 g−1 tap−1). Kinematic analysis of trains of taps showed constant intertap period (ca. 150 ms) and distinctive amplitude modulation. The efficiency of muscular movement inP. striatus is 23% of metabolic input, assuming no elastic storage. This figure will drop to ca. 5–10% if significant elastic storage takes place. Minimum cost of searching for a mate via pedestrian locomotion is 340 J kg−1 m−2, but drops to 33 J kg−1 m−2 for tapping communication. Similar energetic ratios may play a role in the early stages of the evolution of some communication systems.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00702723
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