spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

First published online October 31, 2008
Journal of Experimental Biology 211, 3613-3618 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.023143
This Article
Right arrow Summary Freely available
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Supplementary Material
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Howard, D. R.
Right arrow Articles by Hill, P. S. M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Howard, D. R.
Right arrow Articles by Hill, P. S. M.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Hearing and spatial behavior in Gryllotalpa major Saussure (Orthoptera: Gryllotalpidae)

Daniel R. Howard1,2,*, Andrew C. Mason2 and Peggy S. M. Hill1

1 University of Tulsa, Faculty of Biological Sciences, 600 South College, Tulsa, OK 74104, USA
2 University of Toronto Scarborough, Department of Life Sciences, 1265 Military Trail, Scarborough, ON, M1C 1A4, Canada


Figure 1
View larger version (11K):
[in this window]
[in a new window]

  		Fig. 1. Gryllotalpa major hearing threshold intensity curve (N=5). Tuning sensitivities are evident at both the advertisement call carrier frequency (2 kHz) and in a narrow ultrasonic range (25 kHz) commonly used by echolocating bats. Solid red line indicates the mean of individual thresholds at each frequency. Dotted blue line indicates thresholds derived from pooled intensity–response curve (see Materials and methods).

 

Figure 2
View larger version (11K):
[in this window]
[in a new window]

  		Fig. 2. Gryllotalpa major auditory iso-intensity response curves. The data indicate tuning sensitivities at 2 kHz and 25 kHz at 73 dB (black line), with the curve flattening and shifting toward lower-frequency detection with higher-intensity stimuli (red line=79 dB; blue line=86 dB).

 

Figure 3
View larger version (143K):
[in this window]
[in a new window]

  		Fig. 3. ArcGIS spatio-auditory map of an active G. major lek site within the Springtrap pasture of the Tallgrass Prairie Preserve (April 2006). Each burrow has a buffer zone set at estimated maximum signal distance of the species' calling song carrier frequency (2 kHz) as well as for call harmonic overtones through 10 kHz. Most individuals are within estimated maximum signal distance of other lek members at the carrier frequency, but only small clusters are spaced close enough to potentially detect the higher harmonic overtones of their neighbor's call.

 

Figure 4
View larger version (108K):
[in this window]
[in a new window]

  		Fig. 4. ArcGIS spatio-auditory map showing estimated maximum signal distances for harmonic overtones in the G. major calling song. Map provides closer perspective of inter-male spacing of the most dense burrow aggregation and buffer zones for higher harmonic frequencies within the April 2006 Springtrap lek at the Tallgrass Prairie Preserve. Only pairs and groups of three males are spaced within the estimated maximum signal range of the calling song's highest harmonic components (8 kHz and 10 kHz).

 

Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?



© The Company of Biologists Ltd 2008