02207nas a2200169 4500008004100000245012600041210006900167260001600236300001400252490000800266520162100274100002601895700002201921700002401943700001501967856005501982 2018 eng d00aAdvertising individual identity by mother and adolescent contact calls in Siberian wapiti Cervus elaphus sibiricus0 aAdvertising individual identity by mother and adolescent contact cJan-10-2018 a733 - 7420 v1243 a

Individualistic contact calls facilitate mother‐offspring reunion after separation. However, in many mammals, both the acoustic structure and individuality of contact calls differ between mother and young. In contrast, in Siberian wapiti Cervus elaphus sibiricus, contact calls are similar in the acoustics between mother and young, whereas effects of this similarity on vocal individuality were not investigated. In this study, we analyzed acoustic differences between closed‐mouth (nasal) and open‐mouth (oral) contact calls and examined individuality of the most usual oral calls of 19 Siberian wapiti (9 hinds and 10 5–6‐month adolescents) emitted in response to mother‐offspring separation. In the oral calls, the values of frequency and power variables were higher than in the nasal calls. Calls of hinds and adolescents did not differ by the maximum fundamental frequency and duration, whereas the peak frequency was higher in the young. Discriminant function analysis (DFA) based on 11 acoustic variables of oral calls accurately classified to individual 92.5% of hind calls and 96.9% of adolescent calls (chi‐square test for differences between hinds and adolescents, p = 0.19). Variables mainly contributing to vocal identity (duration, start, and maximum fundamental frequency) were the same in calls of mothers and adolescents. We conclude that similarities in the acoustics calls of mothers and adolescents mean that they do not differ in their potential for encoding individual identity, suggesting a mutual process of mother‐offspring vocal recognition in Siberian wapiti.

1 aSibiryakova, Olga, V.1 aVolodin, Ilya, A.1 aVolodina, Elena, V.1 aWright, J. uhttp://doi.wiley.com/10.1111/eth.2018.124.issue-1002078nas a2200217 4500008004100000245006500041210006200106260001600168490000700184520135800191100002201549700002601571700002401597700002401621700002401645700002401669700003601693700002201729700003201751856007701783 2018 eng d00aBetween-year vocal aging in female red deer (Cervus elaphus)0 aBetweenyear vocal aging in female red deer Cervus elaphus cJan-12-20180 v113 a

Objectives

Studying animal vocal aging has potential implication in the field of animal welfare and for modeling human voice aging. The objective was to examine, using a repeated measures approach, the between-year changes of weight, social discomfort score (bites of other hinds on hind pelt), body condition score (fat reserves) and acoustic variables of the nasal (closed-mouth) and the oral (open-mouth) contact calls produced by farmed red deer hinds (Cervus elaphus) toward their young.

Results

Repeated measures ANOVA revealed that with an increase of hind age for 1 year, the acoustic variables of their nasal contact calls (the beginning and maximum fundamental frequencies, the depth of frequency modulation and the peak frequency) decreased, whereas in their oral contact calls only the end fundamental frequency decreased. Duration and power quartiles did not change in any call type. Body weight and body condition score increased between years, whereas discomfort score decreased. Results of this study revealed directly the short-term effects of aging on the acoustics of the nasal contact calls in the same hinds. This study also confirmed that elevated emotional arousal during emission of the oral contact masks the effects of aging on vocalization in female red deer.

1 aVolodin, Ilya, A.1 aSibiryakova, Olga, V.1 aVasilieva, Nina, A.1 aVolodina, Elena, V.1 aMatrosova, Vera, A.1 aGarcia, Andrés, J.1 aPérez-Barbería, Francisco, J.1 aGallego, Laureano1 aLandete-Castillejos, Tomás uhttps://bmcresnotes.biomedcentral.com/articles/10.1186/s13104-018-3833-4