02442nas a2200181 4500008004100000245012800041210006900169520183000238653001302068653001802081653001502099653001602114653001202130100001402142700002002156700002802176856005602204 2020 eng d00aThe Vocal Repertoire of Golden-Faced Sakis, Pithecia chrysocephala, and the Relationship Between Context and Call Structure0 aVocal Repertoire of GoldenFaced Sakis Pithecia chrysocephala and3 a

Vocalizations are a vital form of communication. Call structure and use may change depending on emotional arousal, behavioral context, sex, or social complexity. Pithecia chrysocephala (golden-faced sakis) are a little-studied Neotropical species. We aimed to determine the vocal repertoire of P. chrysocephala and the influence of context on call structure. We collected data June–August 2018 in an urban secondary forest fragment in Manaus, Amazonian Brazil. We took continuous vocal recordings in 10-min blocks with 5-min breaks during daily follows of two groups. We recorded scan samples of group behavior at the start and end of blocks and used ad libitum behavioral recording during blocks. We collected 70 h of data and analyzed 1500 calls. Lowest frequencies ranged 690.1–5879 Hz in adults/subadults and 5393.6–9497.8Hz in the only juvenile sampled. We identified eight calls, three of which were juvenile specific. We found that, while repertoire size was similar to that of other New World monkeys of similar group size and structure, it also resembled those with larger group sizes and different social structures. The durations of Chuck calls were shorter for feeding contexts compared to hostile, but frequencies were higher than predicted if call structure reflects motivation. This finding may be due to the higher arousal involved in hostile situations, or because P. chrysocephala use Chuck calls in appeasement, similar to behavior seen in other primates. Call structures did not differ between sexes, potentially linked to the limited size dimorphism in this species. Our findings provide a foundation for further investigation of Pithecia vocal behavior and phylogeny, as well as applications for both captive welfare (stress relief) and field research (playbacks for surveys).

10aBehavior10acommunication10aNeotropics10aPitheciidae10aWelfare1 aMuir, Jen1 aBarnett, Adrian1 aSvensson, Magdalena, S. uhttp://link.springer.com/10.1007/s10764-019-00125-701890nas a2200217 4500008004100000245010700041210006900148520112500217653001801342653001401360653003101374653001101405653001101416653001201427100001801439700002601457700001801483700002001501700002001521856013101541 2019 eng d00aWhistling shares a common tongue with speech: bioacoustics from real-time MRI of the human vocal tract0 aWhistling shares a common tongue with speech bioacoustics from r3 a

Most human communication is carried by modulations of the voice. However, a wide range of cultures has developed alternative forms of communication that make use of a whistled sound source. For example, whistling is used as a highly salient signal for capturing attention, and can have iconic cultural meanings such as the catcall, enact a formal code as in boatswain's calls or stand as a proxy for speech in whistled languages. We used real-time magnetic resonance imaging to examine the muscular control of whistling to describe a strong association between the shape of the tongue and the whistled frequency. This bioacoustic profile parallels the use of the tongue in vowel production. This is consistent with the role of whistled languages as proxies for spoken languages, in which one of the acoustical features of speech sounds is substituted with a frequency-modulated whistle. Furthermore, previous evidence that non-human apes may be capable of learning to whistle from humans suggests that these animals may have similar sensorimotor abilities to those that are used to support speech in humans.

10acommunication10aevolution10amagnetic resonance imaging10aspeech10atongue10awhistle1 aBelyk, Michel1 aSchultz, Benjamin, G.1 aCorreia, Joao1 aBeal, Deryk, S.1 aKotz, Sonja, A. uhttps://royalsocietypublishing.org/doi/10.1098/rspb.2019.1116https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2019.111602724nas a2200277 4500008004100000022001300041245009200054210006900146260001600215300001400231490000800245520190000253653001502153653001802168653001602186653001302202653002902215653001302244653002002257100002202277700002002299700002202319700002202341700001702363856006602380 2017 eng d a0003347200aGestural development of chimpanzees in the wild: the impact of interactional experience0 aGestural development of chimpanzees in the wild the impact of in cJan-12-2017 a271 - 2820 v1343 a

To understand the complexity involved in animal signalling, studies have mainly focused on repertoire size and information conveyed in vocalizations of birds and nonhuman primates. However, recent studies on gestural abilities of nonhuman primates have shown that we also need a detailed understanding of other communicative modalities and underlying cognitive skills to grasp this phenomenon in detail. Here, we thus examined gestural signalling of chimpanzees, Pan troglodytes, living in two communities in the wild (Kanyawara, Uganda; Taï South, Co^te d'Ivoire) with a special focus on the influence of the social environment on signal development. Specifically, we investigated to what extent specific social factors, namely behavioural context, interaction rates and maternal proximity, affect gestural production (i.e. gesture frequency, sequences and repertoire size). We used a combination of video recordings and focal scans obtained from 11 infants aged between 9 and 69 months during 1145 h of observation throughout two consecutive field periods. Overall, we found that social play was the context in which the highest number of gestures occurred. While gesture frequency and repertoire size increased with higher inter- action rates with nonmaternal conspecifics and the number of previous interaction partners, no effect was found for interaction rates with mothers. Our results thus imply that infants of social mothers may have a head start in life. Moreover, we provide hitherto undocumented evidence for sex differences in gestural signalling, which may reflect the differential importance of early socialization for chimpanzee males and females. Gestural development thus relies heavily on interactional experiences with con- specifics, which adds support for gestural acquisition via the learning mechanism of ‘social negotiation’ in great apes.

10achimpanzee10acommunication10adevelopment10agestures10ainteractional experience10aontogeny10aPan troglodytes1 aFröhlich, Marlen1 aMüller, Gudrun1 aZeiträg, Claudia1 aWittig, Roman, M.1 aPika, Simone uhttp://linkinghub.elsevier.com/retrieve/pii/S000334721630361X02381nas a2200217 4500008004100000022001400041245007900055210006900134260001600203300001400219490000700233520174200240653001701982653001801999653001402017653001802031653001402049100002002063700002502083856005502108 2015 eng d a0164-029100aCall Repertoire of the Sahamalaza Sportive Lemur, Lepilemur sahamalazensis0 aCall Repertoire of the Sahamalaza Sportive Lemur Lepilemur saham cJan-06-2015 a647 - 6650 v363 aThe acoustic structure of primate loud calls can be used as a powerful, inexpensive, and noninvasive tool for intra- and interspecific comparative analyses, reconstruction of phylogeny, and primate surveys. Despite the range of possibilities offered by acoustic analysis, only few studies so far have focused on quantitative descriptions of the acoustic structure of primate loud call repertoires. Here we aimed to assess the vocal repertoire of the solitary Sahamalaza sportive lemur, Lepilemur sahamalazensis, and to investigate potential communication functions. We recorded every sportive lemur vocalization we heard during 1000 h of nocturnal observations of eight collared individuals, as well as opportunistic searches in the Ankarafa Forest, Sahamalaza Peninsula in northwest Madagascar. In addition, we used playback experiments with four call types to clarify call function. We measured both temporal and spectral properties to describe calls quantitatively and used cross-validated discriminant function analysis to validate call types that we identified from a preliminary qualitative inspection of the spectrograms of 107 calls. We identified six distinct loud call types with the possibility of a seventh call type, with six loud call types similar to those of Lepilemur edwardsi and two loud call types similar to those of four other sportive lemur species. The described call types most likely function in mate advertisement, offspring care, and territorial defense. Future studies of loud calling of the Sahamalaza sportive lemur are needed to clarify if certain call types are sex specific and if loud calls could be used for recognition of individuals to enable noninvasive density measurements and species monitoring.10abioacoustics10aCall function10acall type10acommunication10aLepilemur1 aSeiler, Melanie1 aSchwitzer, Christoph uhttp://link.springer.com/10.1007/s10764-015-9846-0