2 recherche sur le mot-clé 'ALARM CALL'   

Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur / Eric, R. Patel  

Public ISBD Titre : Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur Type de document : texte imprimé Auteurs : Eric, R. Patel, Auteur Année de publication : 2012 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : PROPITHECUS CANDIDUS  VOCALIZATIONS  ALARM CALL Résumé : Vocalizations of Madagascar’s lemurs have generally been less investigated than those of other primate groups, with virtually no information available about calling in the silky sifaka (Propithecus candidus), a large rainforest species. Current work examined the “zzuss” vocalization, one of the most common and loudest sounds produced by this monomorphic species, and included 160 calls from nine adults (five males, four females) in three groups. Analyses focused on overall acoustic features, individual and sex differences, call usage, and likely function. Acoustically, the calls included separable turbulent noise and tonal components, with the later often marked by frequency jumps and dramatic frequency modulation. Male and female zzuss calls differed most in F0- and amplitude-related features, characteristics that are relatively unconstrained by overall body size. All measures differed among individual callers, with F0-related variables again playing the largest role. Based on usage, these calls most likely function both as generalized alarm and group-coordination signals. The sounds were thus of interest in several regards, including showing sexual differentiation in the absence of other dimorphisms, exhibiting primarily F0-based differentiation in both sex- and individual-based comparisons, and combining apparent alarm and coordination functions across a variety of contexts Titre du périodique : The Journal of the Acoustical Society of America Volume : 132 (3): 1799-810 En ligne : https://doi.org/10.1121/1.4740475 Silky sifaka (Propithecus candidus) “zzuss” vocalizations: Sexual dimorphism, individuality, and function in the alarm call of a monomorphic lemur [texte imprimé] / Eric, R. Patel, Auteur . - 2012. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : PROPITHECUS CANDIDUS  VOCALIZATIONS  ALARM CALL Résumé : Vocalizations of Madagascar’s lemurs have generally been less investigated than those of other primate groups, with virtually no information available about calling in the silky sifaka (Propithecus candidus), a large rainforest species. Current work examined the “zzuss” vocalization, one of the most common and loudest sounds produced by this monomorphic species, and included 160 calls from nine adults (five males, four females) in three groups. Analyses focused on overall acoustic features, individual and sex differences, call usage, and likely function. Acoustically, the calls included separable turbulent noise and tonal components, with the later often marked by frequency jumps and dramatic frequency modulation. Male and female zzuss calls differed most in F0- and amplitude-related features, characteristics that are relatively unconstrained by overall body size. All measures differed among individual callers, with F0-related variables again playing the largest role. Based on usage, these calls most likely function both as generalized alarm and group-coordination signals. The sounds were thus of interest in several regards, including showing sexual differentiation in the absence of other dimorphisms, exhibiting primarily F0-based differentiation in both sex- and individual-based comparisons, and combining apparent alarm and coordination functions across a variety of contexts Titre du périodique : The Journal of the Acoustical Society of America Volume : 132 (3): 1799-810 En ligne : https://doi.org/10.1121/1.4740475

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Antipredator Vocalization Usage in the Male Ring-Tailed Lemur (Lemur catta) / Laura M. Bolt ; Michelle L. Sauther ; Frank P. Cuozzo ; Ibrahim Antho Youssouf Jacky  

Public ISBD Titre : Antipredator Vocalization Usage in the Male Ring-Tailed Lemur (Lemur catta) Type de document : texte imprimé Auteurs : Laura M. Bolt ; Michelle L. Sauther ; Frank P. Cuozzo ; Ibrahim Antho Youssouf Jacky Année de publication : 2015 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : MALE VOCALIZATION  ANTIPREDATOR BEHAVIOR  ALARM CALL  VOCALIZATION RATE  MALE DOMINANCE  PREDATOR ABUNDANCE. PREDATOR CONFUSION HYPOTHESIS  GROUP MAINTENANCE HYPOTHESIS  PREDATION RISK ALLOCATION HYPOTHESIS  LEMUR CATTA Résumé : The ring-tailed lemur (Lemur catta) is a group-living strepsirrhine primate endemic to Madagascar that faces considerable predation pressure from aerial and terrestrial predators. This species engages in mobbing and vigilance behavior in response to predators, and has referential alarm vocalizations. Because L. catta is female dominant, less is known about the alarm calls of males. We tested 3 hypotheses for male antipredator vocalization behavior on L. catta at the Bezà Mahafaly Special Reserve in Madagascar: the predator confusion, group maintenance, and predation risk allocation hypotheses. We found support for 2 hypotheses. When a male L. catta made an antipredator call, other group members vocalized in response. Dominant males did not make alarm calls at higher rates than subordinate males. Predators were more abundant on the western side of Parcel 1, but an even greater number of antipredator vocalizations occurred in this area than predator abundance warranted. We show that male L. catta consistently participated in group-level antipredator vocalization usage in high-risk locations. Although female L. catta are known to hold the primary role in group defense, male L. catta are also key participants in group-wide behaviors that may confuse or drive away predators. Titre du périodique : Folia Primatologica Volume : 86 : 124-133 En ligne : https://doi.org/10.1159/000369064 Antipredator Vocalization Usage in the Male Ring-Tailed Lemur (Lemur catta) [texte imprimé] / Laura M. Bolt ; Michelle L. Sauther ; Frank P. Cuozzo ; Ibrahim Antho Youssouf Jacky . - 2015. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Menaces et Pressions Mots-clés : MALE VOCALIZATION  ANTIPREDATOR BEHAVIOR  ALARM CALL  VOCALIZATION RATE  MALE DOMINANCE  PREDATOR ABUNDANCE. PREDATOR CONFUSION HYPOTHESIS  GROUP MAINTENANCE HYPOTHESIS  PREDATION RISK ALLOCATION HYPOTHESIS  LEMUR CATTA Résumé : The ring-tailed lemur (Lemur catta) is a group-living strepsirrhine primate endemic to Madagascar that faces considerable predation pressure from aerial and terrestrial predators. This species engages in mobbing and vigilance behavior in response to predators, and has referential alarm vocalizations. Because L. catta is female dominant, less is known about the alarm calls of males. We tested 3 hypotheses for male antipredator vocalization behavior on L. catta at the Bezà Mahafaly Special Reserve in Madagascar: the predator confusion, group maintenance, and predation risk allocation hypotheses. We found support for 2 hypotheses. When a male L. catta made an antipredator call, other group members vocalized in response. Dominant males did not make alarm calls at higher rates than subordinate males. Predators were more abundant on the western side of Parcel 1, but an even greater number of antipredator vocalizations occurred in this area than predator abundance warranted. We show that male L. catta consistently participated in group-level antipredator vocalization usage in high-risk locations. Although female L. catta are known to hold the primary role in group defense, male L. catta are also key participants in group-wide behaviors that may confuse or drive away predators. Titre du périodique : Folia Primatologica Volume : 86 : 124-133 En ligne : https://doi.org/10.1159/000369064

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