Publications

reproduction in the crowned lemur (lemur coronatus) in captivity.	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 wer ...	1987	31973492
ecology and conservation of the crowned lemur, lemur coronatus, at ankarana, n. madagascar. with notes on sanford's lemur, other sympatrics and subfossil lemurs.	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 preliminary study of the ecology of this species in the ankarana special reserve conducted at the end of the dry season in 1986, with additional information collected a year later. crowned lemurs occur in very high densities in the semi-deciduous canopy forest and this probably represents a dry season refuge for the specie ...	1989	2807091
evidence for nonseasonal reproduction in wild aye-ayes (daubentonia madagascariensis).	the lemurs of madagascar typically exhibit a strictly seasonal pattern of breeding, with a limited number of successive estrous cycles occurring at a particular time of the year, which varies from species to species. previous reports indicated that aye-ayes also exhibit such a strictly seasonal polyestrous pattern. data from the author's 2-year field study of aye-ayes on the island of nosy mangabe, combined with information from recently initiated captive breeding programs, now indicate that thi ...	1994	7721208
phylogeny of the lemuridae revisited: evidence from communication signals.	phylogenetic relationships among the extant lemurid prosimians were assessed cladistically using stereotyped vocal, olfactory, and visual communication characters. among our results are 3 findings of particular importance. first, our data are consistent with those from several recent studies of highly repeated dna fragments in supporting a close phyletic affinity between lemur catta and the genus hapalemur. moreover, our results indicate that l. catta is nested within the hapalemur clade as the ...	1994	7813970
non-telomeric chromosome localization of (ttaggg)n repeats in the genus eulemur.	the chromosomal distribution of the (ttaggg)n telomeric repetitive sequences was studied in the malagasy species eulemur fulvus fulvus (2n = 60), eulemur rubriventer (2n = 50), eulemur coronatus (2n = 46) and eulemur macaco (2n = 44). these sequences hybridize to the telomeres of all chromosomes of the four species and also to the pericentromeres of all chromosomes of e. fulvus, e. coronatus and e. macaco, with the exception of the pericentromeres of e. coronatus and e. macaco chromosomes 9, the ...	1997	9421267
occurrence of dna sequence differences in c-heterochromatin of eulemur coronatus and eulemur macaco, as revealed by fluorescence resonance energy transfer.	in the genus eulemur (malagasy lemurs) karyotype diversification has occurred mainly through robertsonian mechanisms of chromosome fusion (rumpler et al., 1976). eulemur coronatus is the sole species to have the largest genome size, due to a very large amount of c-heterochromatin, mostly located at the pericentromeric regions of the largest chromosomes (warter and rumpler, 1985). this increase in c-heterochromatin was thought to be due to dna amplification (ronchetti et al., 1993). the aim of th ...	1997	9271700
six-year-old archival chromosome preparations are still good biological reagents for repeated primed in situ labelling (rprins).	six-year-old chromosome preparations of eulemur coronatus were used for in situ localization of highly repetitive dna sequences. the application of the repeated primed in situ labelling (rprins) technique allowed the detection of positive signals whereas conventional fluorescence in situ hybridization gave negative results on the same archival preparations. this paper reveals the possibility of rescuing archival chromosome preparations for both clinical and comparative cytogenetics. moreover, th ...	1998	9728293
karyotype abnormalities in two primate species, pygathrix nemaeus and lemur coronatus.	the karyotypes of 7 douc langurs (pygathrix nemaeus) and 3 crowned lemurs (lemur coronatus) were examined. abnormalities in 23.5% of the karyotypes of 1 male douc langur were associated with a history of fathering stillborns and abortuses (38%). karyotype analysis of an apparently normal female lemur revealed three differing karyotypes, one normal and two abnormal.	2000	102569
an unusual primate locus that attracted two independent alu insertions and facilitates their transcription.	bc200 rna, a neuronal, small non-messenger rna that originated from a monomeric alu element is specific to anthropoid primates. tarsiers lack an insert at the orthologous genomic position, whereas strepsirrhines (lemuriformes and lorisiformes) acquired a dimeric alu element, independently from anthropoids. in galago moholi, the cpg dinucleotides are conspicuously conserved, while in eulemur coronatus a large proportion is changed, indicating that the g.moholi alu is under purifying selection and ...	2005	15922354
a composite molecular phylogeny of living lemuroid primates.	lemuroid phylogeny is a source of lively debate among primatologists. reconstructions based on morphological, physiological, behavioural and molecular data have yielded a diverse array of tree topologies with few nodes in common. in the last decade, molecular phylogenetic studies have grown in popularity, and a wide range of sequences has been brought to bear on the problem, but consensus has remained elusive. we present an analysis based on a composite molecular data set of approx. 6,400 bp ass ...	2006	17053329
female social dominance in two eulemur species with different social organizations.	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- ...	2007	19360573
gastrointestinal morphology of the crowned lemur (eulemur coronatus).	i provide measurements of the gastrointestinal tract of a captive female eulemur coronatus, obtained at necropsy, and describe its morphology. the small intestine, caecum and colon were short when compared with those of other lemur species. the ratio of intestine length to body length was low. distinct sacculations were present in the caecum, but not in the colon. the results suggest that e. coronatus is able to digest a certain amount of structural polysaccharides as contained in plant cell wal ...	2009	19694645
evolutionary roots of motor planning: the end-state comfort effect in lemurs.	humans (homo sapiens) anticipate the consequences of their forthcoming actions. for example, they grasp objects with uncomfortable grasps to afford comfortable end positions-the end-state comfort (esc) effect. when did such sophisticated motor planning abilities emerge in evolution? we addressed this question by asking whether humans' most distant living primate relatives-lemurs-also exhibit the esc effect. we presented 6 species of lemurs (lemur catta, eulemur mongoz, eulemur coronatus, eulemur ...	2010	20476823
a 12-month survey of gastrointestinal helminth infections of lemurs kept in two zoos in madagascar.	infections with gastrointestinal parasites may be a major threat to lemurs kept in captivity, as they are a common cause of diarrhea. in this study, fecal egg count patterns and clinical signs associated with gastrointestinal nematodes were assessed for 12 mo in 40 lemurs kept under different husbandry and climatic conditions at two sites in madagascar. involved species were black-and-white ruffed lemurs (varecia variegata), eastern grey bamboo lemurs (hapalemur griseus), greater bamboo lemurs ( ...	2010	21370644
the influence of visitor interaction on the behavior of captive crowned lemurs (eulemur coronatus) and implications for welfare.	research suggests that zoo visitors can have positive, negative, and neutral impacts on captive primate welfare; however, research investigating the implications of visitor-animal feeding experiences is extremely limited. in the uk, a large proportion of biaza zoos that house lemur species offer visitor interaction experiences (16 out of 33). this study investigated the impact on the behavior of a family group of crowned lemurs (eulemur coronatus) housed at newquay zoo, uk of visitors, accompani ...	2016	27142724
activity patterns in seven captive lemur species: evidence of cathemerality in varecia and lemur catta?	cathemerality, or activity throughout the 24-hr cycle, is rare in primates yet relatively common among lemurs. however, the diverse ecological conditions under which cathemerality is expressed complicates attempts to identify species-typical behavior. for example, lemur catta and varecia have historically been described as diurnal, yet recent studies suggest that they might exhibit cathemeral behavior under some conditions. to investigate this variation, we monitored activity patterns among lemu ...	2017	28257553
functional morphology of mimetic musculature in primates: how social variables and body size stack up to phylogeny.	mammalian skeletal muscle is influenced by the functional demands placed upon it. functional morphology of facial expression musculature, or mimetic musculature, is largely unknown. recently, primate mimetic musculature has been shown to respond to demands associated with social factors. body size has also been demonstrated to affect many aspects of primate functional morphology and evolutionary morphology. the present study was designed to further examine the role of social variables and body s ...	2018	29330949
eulerian videography technology improves classification of sleep architecture in primates.	sleep is a critically important dimension of primate behavior, ecology, and evolution, yet primate sleep is under-studied because current methods of analyzing sleep are expensive, invasive, and time-consuming. in contrast to electroencephalography (eeg) and actigraphy, videography is a cost-effective and non-invasive method to study sleep architecture in animals. with video data, however, it is challenging to score subtle changes that occur in different sleep states, and technology has lagged be ...	2019	31456082
realized distribution patterns of crowned lemurs (eulemur coronatus) within a human-dominated forest fragment in northern madagascar.	due to the impact of anthropogenic activities on forest extent and integrity across madagascar, it is increasingly necessary to assess how endangered lemur populations inhabiting human-dominated forest fragments can effectively sustain themselves ecologically. our research addresses this concern by exploring how the distribution patterns of a small population of crowned lemurs (eulemur coronatus), occupying a degraded forest fragment at oronjia forest new protected area in northern madagascar, a ...	2020	32202661