Crowned lemur

About: Crowned lemur is a research topic. Over the lifetime, 12 publications have been published within this topic receiving 272 citations. The topic is also known as: crowned lemur.

Ecology and conservation of the crowned lemur, Lemur coronatus, at Ankarana, n. Madagascar. With notes on Sanford's lemur, other sympatrics and subfossil lemurs.

Abstract: Forests of Ankarana limestone massif in northern Madagascar support one of the largest and least disturbed populations of Crowned Lemurs, Lemur coronatus. This paper reports a preli

Quantitative acoustic analysis of the vocal repertoire of the crowned lemur

Abstract: Only a preliminary qualitative description of the vocal repertoire of Eulemur coronatus is available and no quantitative study of the calls of any wild or captive crowned lemur has ever been performed. The aim of this study was to verify whether the categories of calls in the crowned lemur's vocal repertoire briefly described on qualitatively bases by Macedonia & Stanger (1994) correspond to discrete phonetic categories. Through all-occurrence and focal animal observations, we recorded the vocal activity of 37 crowned lemurs housed in five institutions, both in Europe and Madagascar. We measured both temporal and spectral properties to describe calls quantitatively. We extracted acoustic parameters in the perspective of the source-filter theory of sound production. From spectrograms, we measured call duration and 6 larynx-related features and, using Linear Predictive Coding spectra, we measured four vocal tract related acoustic properties. From a preliminary qualitative inspection of the spectrograms, we ...

Female social dominance in two Eulemur species with different social organizations.

Abstract: Female social dominance is rare in mammals, but common in lemurs. We investigated social dominance in two Eulemur species; the polygynous crowned lemur (E. coronatus) and the monogamous red-bellied lemur (E. rubriventer), using four and two social groups, respectively. We collected data on agonistic interactions and two types of affiliative behavior (grooming and maintaining spatial proximity). We used a combination of focal watches of individuals, instantaneous scan-sampling of groups, and all-occurrence of some behaviors in groups. We found that overall rates of agonistic interactions were higher in E. coronatus, and they also had more decided intersexual agonistic interactions than E. rubriventer. However, in both species the females won the vast majority of these agonistic interactions. E. coronatus females were groomed more often by males than vice versa, whereas no sex differences in grooming were observed in E. rubriventer. We found that males were responsible for maintaining spatial proximity in E. coronatus whereas in E. rubriventer, females were responsible. In one group of E. coronatus, the male was overweight and dominant to the female and this is the first observation of male dominance in a lemur species typically described as female dominant. We suggest that body weights in captivity be monitored for maintaining normal dominance relationships. Overall, agonistic behaviors were consistent with clear female social dominance in both E. coronatus and E. rubriventer. The affiliative behaviors also provided clear evidence for female dominance E. coronatus, but not for E. rubriventer. Zoo Biol 0: 1-14, 2007. (c) 2007 Wiley-Liss, Inc.

Reproduction in the crowned lemur (Lemur coronatus) in captivity

Abstract: Four pairs of captive crowned lemurs (Lemur coronatus) were studied during their annual breeding season in order to obtain baseline data on their reproductive biology for comparison with other Lemur species and to enhance their captive breeding success. Vaginal smears, testicular measurements, and records of the Duke University Primate Center provided the presented data. During a single breeding season, females cycled an average of three times, with an average cycle length of 34 days. Cycles were detected between November and March. Vaginal estrus and copulations were limited to one day per cycle. After 125 days of gestation females gave birth to one or two young. Both sexes attained sexual maturity at an age of about 20 months. Mean male testis size peaked in late December; at the same time, three of the females experienced their first estrus. Based on all available data, there was a significant positive correlation between cycle length and gestation length in the genus Lemur.