Stability of acoustic individuality in the alarm calls of wild yellow ground squirrels Spermophilus fulvus and contrasting calls from trapped and free-ranging callers.

作者: Vera A. Matrosova , Ilya A. Volodin , Elena V. Volodina , Nina A. Vasilieva

DOI: 10.1007/S00114-010-0686-7

关键词:

摘要: The questions of individuality and stability cues to identity in vocal signals are considerable importance from theoretical conservation perspectives. While alarm calls has been reported for many sciurids, it is not well-documented that the encoded stable between different encounters with predators. Previous studies two obligate hibernating rodents, speckled ground squirrels Spermophilus suslicus, yellow fulvus demonstrated that, after hibernation, most individuals could be identified reliably by their calls. Moreover, squirrels, individual patterns changed progressively over as little 2 weeks. However, these previous data have obtained using collection trapped animals. Here, we examined ten free-ranging dye-marked determine whether retain surrogate predators (humans), separated on average 3 days. Discriminant function analysis showed were very similar within a recording session, providing high distinctiveness. six animals, unstable sessions. Also, consistency acoustic characteristics humans, differing techniques call collection, vs We found differences only variables, both related sound degradation environment. Data discussed relation hypotheses explaining adaptive utility

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