| Autor: |
Ann E. Bowles, Scott Yaeger, Richard Golightly, B. Andrew Kugler |
| Rok vydání: |
1996 |
| Předmět: |
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| Zdroj: |
The Journal of the Acoustical Society of America. 99:2575-2603 |
| ISSN: |
0001-4966 |
| Popis: |
Two male and female desert kit foxes were exposed to simulated prey and predator sounds in the presence of aircraft noise to determine detection rates. They were tested in a 9.75×9.15‐m outdoor pen in the dark. Five feeding stations were equipped with speakers to play scratching sounds (prey noise) and a single speaker outside the pen projected stealthy footsteps (predator noise). Foxes approached feeding stations projecting prey noise to receive a reward; they spontaneously avoided predator noise. Foxes were exposedto 980 simulated low‐altitude jet overflights in the range from 65 to 95 dB ASEL. Stimulus sounds were played for 1 min at the limit of detection; the longest simulated overflight was 45 s. Fox performance was compared with and without simulated aircraft noise (309 and 110 trials, respectively). Foxes exhibited flight reactions or dropped flat during initial exposures. Within 1–2 series of exposures, these responses habituated, although milder reactions persisted. Foxes identified the correct feeding station 63%–71% of the time (chance rate=20%) in silence versus 24%–30% in noise. They detected predator sounds on 81%–83% of trials, regardless of noise. The results suggest that foxes listened for potential predators preferentially in the presence of aircraft noise. [Work supported by USAF NSBIT Program, Contract F33615‐90‐D‐0653.] |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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