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Peter M. Narins
imagined. Vibration signaling provides a means for animals to communicate with
each other without the effort of overcoming the often formidable ambient acoustic
noise levels produced by other calling individuals. It is possible that various
substrates in diverse habitats offer a relatively quiet channel waiting to be
exploited by seismically active animals. Thus the vibration sensitivity of substratedwelling animals is likely to be widespread and may serve as a neuroethological
model for understanding the evolution of vibrational communication systems in
environments characterized by high levels of airborne noise.
Acknowledgments. I thank F. G. Barth for his kind invitation to participate in the
Sensory Ecology meeting in Vienna, his warm hospitality during the meeting, and
his personal understanding during the production of the resulting manuscript.
Thanks are due as well to the Austrian Academy of Science for their generous
support. I am most grateful to R. Cocroft for the loan of the C. calyptratus
recording and to W. Yamada for providing the bimodal second-order kernel.
Many thanks are due to E. R. Lewis for helpful discussions and to M. Mason for
his helpful comments on the manuscript. Work supported by the UCLA Academic
Senate and NIDCD grant no. DC00222.
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