Abstract # 68:

Scheduled for Saturday, September 13, 2014 07:00 PM-09:00 PM: Session 11 (Decatur B) Poster Presentation


M. G. Rice1, M. M. Petracca2 and N. G. Caine1
1California State University San Marcos, San Marcos, CA 92096, USA, 2University of Nebraska-Lincoln, Lincoln, NE 68588
     Previous research has shown group-specific differences in the contact calls of only a few species of primates. While it has been suggested that the vocal convergence of contact calls may be beneficial for the location and recognition of groupmates, limited research has investigated whether this is true for other call types. We were interested in whether alarm calls of common marmosets differed by family group. We recorded the alarm calls of seven captive adult marmosets (N=3 and N=4) in response to a snake model. We used acoustic software to measure four parameters: duration, and starting, maximum, and ending frequency. A discriminant function analysis confirmed that duration and starting frequency distinguished among the two marmoset groups [X2(2)=183.15, p<.001]. A jackknifed classification process was run using sample proportions as prior probabilities. This process correctly classified 262 out of 301 (87%) alarm calls, which is significantly more than would be correctly classified by chance alone [152(50.6%); X2(1)=155.01, p<.05]. The stability of the classification process was checked by cross-validation, in which again 86.4% (260) of the alarm calls were correctly classified. These results show that common marmoset alarm calls elicited by a snake model are distinguishable by family group. Additional research is needed to determine whether genetic relatedness or social bonds account for these differences.