Lack of correlation between vertical distribution and carrier frequency, and preference for open spaces in arboreal katydids that use extreme ultrasound, in Gorgona, Colombia (Orthoptera: Tettigoniidae)

Montealegre-Z, Fernando and Sarria, Fabio and Pimienta, Maria C. and Mason, Andrew C. (2014) Lack of correlation between vertical distribution and carrier frequency, and preference for open spaces in arboreal katydids that use extreme ultrasound, in Gorgona, Colombia (Orthoptera: Tettigoniidae). International Journal of Tropical Biology & Conservation / Revista de Biología Tropical, 62 . pp. 289-296. ISSN 2215-2075

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Lack of correlation between vertical distribution and carrier frequency, and preference for open spaces in arboreal katydids that use extreme ultrasound, in Gorgona, Colombia (Orthoptera: Tettigoniidae)
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Abstract

Male Tettigoniidae emit sound to attract conspecific females. The sound is produced by stridulation.
During stridulation the forewings open and close, but it is during the closing stroke that the scraper contacts the
file teeth to generate the predominant sound components, which are amplified by adjacent wing cells specialized
in sound radiation. The sounds usually exceed the sonic boundary and might occur above 40 kHz, reaching
extreme ultrasonic frequencies of 150kHz in some species. Here we test the hypothesis that Tettigoniidae
species should prefer microhabitats that favour efficient signal transmission, i.e. that there is a relationship
of sound frequency with the vertical distribution of the species (from ground to canopy) at Gorgona National
Natural Park, Colombia. We sampled 16 trees and four different altitudinal levels between 1 and 20m above the
understory vegetation. We placed collecting blankets separated by vertical distances of 5m, and knocked insects
down using the technique known as fogging. We found no correlation between vertical distribution and carrier
frequency, but there was a preference for open spaces (below the canopy and above the understory) in species
using extreme ultrasound. This is the first quantitative description of the vertical distribution in neotropical species
of the family Tettigoniidae and its relationship to the calling song frequency.

Keywords:canopy insects, stridulation, fogging, bioacoustics, ultrasound, vertical distribution., NotOAChecked
Subjects:C Biological Sciences > C340 Entomology
C Biological Sciences > C181 Biodiversity
Divisions:College of Science > School of Life Sciences
ID Code:14624
Deposited On:06 Aug 2014 15:12

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