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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Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective / Lisa Gould  

Public ISBD Titre : Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective Type de document : texte imprimé Auteurs : Lisa Gould, Auteur ; R.W. Sussman, Auteur ; Michelle L. Sauther, Auteur Année de publication : 2003 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : POPULATION CHANGE  FECUNTIDY  INFANT MORTALITY  LIFE-SPAN  ENVIRONMENTAL VARIABLES Résumé : Over 15 field seasons (1987–2001), we collected census and life-history data on a population of individually identified ring-tailed lemurs at the Beza Mahafaly Reserve, Madagascar. No significant difference was found in population size over the study period, though a marked decline in the population occurred following a 2-year drought. The population rebounded rapidly after the immediate postdrought period. There was nearly a complete replacement of individuals over the study period. Average group size is 11.5 animals, and adult male to female sex ratio is 0.92. Most females reproduce annually, and the average fecundity rate is 84.3%. The greatest variability in fecundity is found among old females. We suggest that ring-tailed lemur females follow an “income breeding” strategy, i.e., females use maximum resources during reproduction rather than relying on fat stores, as do “capital breeders.” Infant mortality to 1 year of age in a nondrought year is 52%, higher than infant mortality in small to medium-sized anthropoids. The oldest known female was 18 years old in 2001. We suggest that 18–20 years may represent the maximum life-span for wild ring-tailed lemurs. Because males regularly emigrate from the population, we have no data regarding male life-span; however, there is some indication that males do not survive as long as females. Group fission has occurred three times: twice from one parent group living in the driest area of the reserve, with the most dispersed food resources. We suggest that the reproductive strategy that has evolved in this species, wherein females reproduce early in life and annually until old age, is a response to the unusual climate and environmental conditions under which Lemur catta has evolved. Titre du périodique : American Journal of Physical Anthropology Volume : 120: 182-194 En ligne : DOI 10.1002/ajpa.10151 Demographic and life-history patterns in a population of ring-tailed lemurs (Lemur catta) at Beza Mahafaly Reserve, Madagascar: A 15-year perspective [texte imprimé] / Lisa Gould, Auteur ; R.W. Sussman, Auteur ; Michelle L. Sauther, Auteur . - 2003. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : LEMURIENS LEMURIENS:Biologie, Ecologie, Densité Mots-clés : POPULATION CHANGE  FECUNTIDY  INFANT MORTALITY  LIFE-SPAN  ENVIRONMENTAL VARIABLES Résumé : Over 15 field seasons (1987–2001), we collected census and life-history data on a population of individually identified ring-tailed lemurs at the Beza Mahafaly Reserve, Madagascar. No significant difference was found in population size over the study period, though a marked decline in the population occurred following a 2-year drought. The population rebounded rapidly after the immediate postdrought period. There was nearly a complete replacement of individuals over the study period. Average group size is 11.5 animals, and adult male to female sex ratio is 0.92. Most females reproduce annually, and the average fecundity rate is 84.3%. The greatest variability in fecundity is found among old females. We suggest that ring-tailed lemur females follow an “income breeding” strategy, i.e., females use maximum resources during reproduction rather than relying on fat stores, as do “capital breeders.” Infant mortality to 1 year of age in a nondrought year is 52%, higher than infant mortality in small to medium-sized anthropoids. The oldest known female was 18 years old in 2001. We suggest that 18–20 years may represent the maximum life-span for wild ring-tailed lemurs. Because males regularly emigrate from the population, we have no data regarding male life-span; however, there is some indication that males do not survive as long as females. Group fission has occurred three times: twice from one parent group living in the driest area of the reserve, with the most dispersed food resources. We suggest that the reproductive strategy that has evolved in this species, wherein females reproduce early in life and annually until old age, is a response to the unusual climate and environmental conditions under which Lemur catta has evolved. Titre du périodique : American Journal of Physical Anthropology Volume : 120: 182-194 En ligne : DOI 10.1002/ajpa.10151

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