| edge effects and their influence on lemur density and distribution in southeast madagascar. | edge effects are caused by the penetration of abiotic and biotic conditions from the matrix into forest interiors. although edge effects influence the biogeography of many tropical organisms, they have not been studied directly in primates. edge effects are particularly relevant to lemurs due to the loss of 80-90% of forests in madagascar. in this study, data are presented on how biotic edge effects influenced the distribution and density of lemurs in the vohibola iii classified forest in southe ... | 2006 | 16323178 |
| lemur responses to edge effects in the vohibola iii classified forest, madagascar. | forest edges are dynamic zones characterized by the penetration (to varying depths and intensities) of conditions from the surrounding environment (matrix) into the forest interior. although edge effects influence many tropical organisms, they have not been studied directly in primates. edge effects are particularly relevant to lemurs because of the highly fragmented forest landscapes found in madagascar. in this study, data are presented regarding how the densities of six lemur species (avahi l ... | 2006 | 16477598 |
| feeding patterns in a small-bodied nocturnal folivore (avahi laniger) and the influence of leaf chemistry: a preliminary study. | we present data on feeding patterns in avahi laniger and compare these data to temporal variations in leaf chemistry. because a. laniger is one of the smallest folivorous primates and has a monogastric stomach, we hypothesized that this lemur would display behavioural adaptations to a leaf-based diet by scheduling feeding times when leaves were of highest quality. data were collected from may to august 2004 at the vatoharanana site in ranomafana national park, madagascar. a. laniger fed during d ... | 2006 | 16612096 |
| phylogenetic history of the sifakas ( propithecus: lemuriformes) derived from cytogenetic studies. | the r-banded karyotypes of the different subspecies of propithecus diadema and p. verreauxi are compared to each other and to that of p. tattersalli, as well as those previously reported of indri indri and avahi laniger. this comparison shows that the different subspecies of p. verreauxi possess the same karyotype and that, among p. diadema, p. d. diadema and p. d. perrieri share the same karyotype differing from that of p. d. edwardsi by one robertsonian translocation. the karyotype of p. tatte ... | 2004 | 15252241 |
| the three-dimensional structure of trabecular bone in the femoral head of strepsirrhine primates. | it has been hypothesized for over a hundred years that trabecular bone plays an important structural role in the musculoskeletal system of animals and that it responds dynamically to applied loads through growth. the objectives of this study are to quantify the three-dimensional structure of femoral head trabecular bone in a sample of extant strepsirrhines and to relate patterns of interspecific variation to locomotor behavioral differences. the bone volume fraction (bv/tv) and fabric anisotropy ... | 2002 | 12098207 |
| [cranial and mandibular morphology of the indrinae. contribution of procrustes methods and fourier analysis]. | although it is universally accepted that the indridae family is monophyletic, there is no such unanimity about how the extant species of the indrinae sub-family are related. cranium and mandible disparity among indri indri, propithecus diadema, propithecus verreauxi and avahi laniger is analysed by geometrical morphometric methods and interpreted in adaptive terms. we compare results obtained by two techniques: procrustes superimpositions for skulls and elliptical fourier analysis for jawbones. ... | 2000 | 10923214 |
| niche separation of seven lemur species in the eastern rainforest of madagascar. | this study examines segregation of seven lemur species in an eastern rainforest of madagascar by a numerical analysis of microhabitats using structural and phenological data. these data are combined with the results of a previous study on food selection by these species in relation to plant chemistry. description of some 441 10×10 m(2) microhabitats yields clear separation of the frugivorous from the more folivorous guild of lemurs. within each guild there are subgroups of two species each, whic ... | 1989 | 28312866 |
| chromosomal evolution in malagasy lemurs. vii. phylogenic relationships between propithecus, avahi (indridae), microcebus (cheirogaleidae), and lemur (lemuridae). | a chromosomal banding study was carried out on propithecus verreauxi verreauxi, p. verreauxi deckeni, and avahi laniger laniger. comparison of their karyotypes with those of microcebus murinus and lemur fulvus led to reconstruction of the ancestral lemuriform karyotype and a determination that the branch leading to the indridae was isolated very early, before the separation of the lemuridae from the cheirogaleidae. the karyotype of avahi remained highly ancestral, whereas that of p. verreauxi wa ... | 1983 | 6641285 |
| the role of acoustic signaling for spacing and group coordination in a nocturnal, pair-living primate, the western woolly lemur (avahi occidentalis). | how social groups govern their distribution in time and space is a central question in socioecology. the aim of this study is to explore the role of acoustic signaling for spacing and cohesiveness in a nocturnal, cohesive, pair-living strepsirrhine. | 2016 | 26606885 |
| peaceful primates: affiliation, aggression, and the question of female dominance in a nocturnal pair-living lemur (avahi occidentalis). | affiliation/agonism and social dominance are central factors determining social organization in primates. the aim of our study is to investigate and describe, for the first time, the intersexual relations in a nocturnal and cohesive pair-living prosimian primate, the western woolly lemur (avahi occidentalis), and to determine to what extent phylogeny, activity mode, or the cohesiveness of pair partners shape the quality of social interactions. six pairs of western woolly lemurs were radio-collar ... | 2011 | 21905062 |
| new species of woolly lemur avahi (primates: lemuriformes) in bemaraha (central western madagascar). | there are at least three distinct taxa of woolly lemurs (genus avahi) in western madagascar. the range of avahi occidentalis extends north and east of the betsiboka river to the bay of narinda. avahi unicolor occurs well to the north, including the ampasindava peninsula and the manongarivo special reserve. here we describe a third avahi population in central western madagascar, which was discovered in the bemaraha strict nature reserve in the tsingy de bemaraha region, north of the manambolo riv ... | 2005 | 16287101 |
| sleeping site ecology, but not sex, affect ecto- and hemoparasite risk, in sympatric, arboreal primates (avahi occidentalis and lepilemur edwardsi). | a central question in evolutionary parasitology is to what extent ecology impacts patterns of parasitism in wild host populations. in this study, we aim to disentangle factors influencing the risk of parasite exposure by exploring the impact of sleeping site ecology on infection with ectoparasites and vector-borne hemoparasites in two sympatric primates endemic to madagascar. both species live in the same dry deciduous forest of northwestern madagascar and cope with the same climatic constraints ... | 2017 | 28943886 |
| population viability and harvest sustainability for madagascar lemurs. | subsistence hunting presents a conservation challenge by which biodiversity preservation must be balanced with safeguarding of human livelihoods. globally, subsistence hunting threatens primate populations, including madagascar's endemic lemurs. we used population viability analysis to assess the sustainability of lemur hunting in makira natural park, madagascar. we identified trends in seasonal hunting of 11 makira lemur species from household interview data, estimated local lemur densities in ... | 2019 | 29896899 |
| baseline health and nutrition evaluation of two sympatric nocturnal lemur species (avahi laniger and lepilemur mustelinus) residing near an active mine site at ambatovy, madagascar. | extractive industries can have significant impacts on ecosystems through loss of habitat, degradation of water quality, and direct impact on floral and faunal biodiversity. when operations are located in sensitive regions with high biodiversity containing endangered or threatened species, it is possible to minimize impact on the environment by developing programs to scientifically monitor the impact on resident flora and fauna species in the early phases of operation so that effects can be mitig ... | 2017 | 28920824 |
| a possible role of plantations for primate conservation in madagascar. | the utilization of eucalyptus plantations by seven sympatric species of prosimians was studied in the eastern rainforest of madagascar. the species were avahi laniger, cheirogaleus major, hapalemur griseus, indri indri, lemur fulvus, lepilemur mustelinus, and microcebus rufus. none of the lemurs was ever found in young eucalyptus plantations with little undergrowth. this was mainly due to the lack of travel opportunities within the shrub layer and between the shrubs and the canopy. food (mainly ... | 1987 | 31973503 |
| chromosomal evolution in malagasy lemurs: x. chromosomal banding studies of propithecus diadema edwardsi and indri indri and phylogenic relationships between all the species of the indriidae. | the r-banded karyotypes of two indriidae, propithecus diadema and indri indri, are described and compared with each other and with those of the other species of this family, previously reported, avahi laniger and propithecus verreauxi. these comparisons show that 30 chromosomal rearrangements, including 21 robertsonian translocations and eight pericentric inversions, differentiate these karyotypes. a phylogenic diagram is proposed, showing the early separation of avahi and the relatively late di ... | 1988 | 31968877 |
| are sleeping site ecology and season linked to intestinal helminth prevalence and diversity in two sympatric, nocturnal and arboreal primate hosts (lepilemur edwardsi and avahi occidentalis)? | various factors, such as climate, body size and sociality are often linked to parasitism. this constrains the identification of other determinants driving parasite infections. here, we investigate for the first time intestinal parasites in two sympatric arboreal primate species, which share similar activity patterns, feeding ecology, body size and sociality, and cope with the same climate conditions, but differ in sleeping site ecology: the milne-edward's sportive lemur (lepilemur edwardsi) and ... | 2018 | 30005645 |
| a role for gut microbiota in host niche differentiation. | if gut microbes influence host behavioral ecology in the short term, over evolutionary time, they could drive host niche differentiation. we explored this possibility by comparing the gut microbiota of madagascar's folivorous lemurs from indriidae and lepilemuridae. occurring sympatrically in the eastern rainforest, our four, target species have different dietary specializations, including frugo-folivory (sifakas), young-leaf folivory (indri and woolly lemurs), and mature-leaf folivory (sportive ... | 2020 | 32238913 |
| pilot survey of avahi population (woolly lemurs) in littoral forest fragments of southeast madagascar. | this study presents a pilot survey of the avahis (pair-living, nocturnal prosimians) living in threatened littoral forest fragments of southeastern madagascar. in the period of october-december 2004, i evaluated the density of adult and newborn avahis (carried by the mothers) by counting the individuals encountered during 58 night walks in seven fragments of sainte luce and mandena forests, along one trail/fragment. along each trail, i used random plots (5 m2) for a preliminary characterization ... | 2008 | 17805480 |
| chromosomal evolution in malagasy lemurs: xii. chromosomal banding study of avahi laniger occidentalis (syn: lichanotus laniger occidentalis) and cytogenetic data in favour of its classification in a species apart-avahi occidentalis. | a cytogenetical study of the western form of avahi (avahi laniger occidentalis) shows that its karyotype differs from that of a. laniger laniger by at least 3 chromosomal rearrangements. meiotic chromosomal pairing of hypothetical hybrids has been constructed. its configuration, a tetravalent with an inversion loop, is likely to strongly reduce fertility, especially in the male. this leads us to propose that the two forms correspond to two distinct species, separated by a gametic barrier: avahi ... | 1990 | 31963970 |