Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"lemurs"”.
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Sex-specific reproductive strategies in redfronted lemurs (Eulemur fulvus rufus, Primates, Lemuridae)
… is generally female-biased. Gregarious Malagasy lemurs deviate from theoretical expectations derived from sexual selection theory and from patterns found among anthropoids because they live in relatively small groups with an even or male-biased adult sex ratio and lack sexual dimorphism. The aim …
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The Ecology and Evolution of the Folivore Gut Microbiome in Madagascar’s Lemurs
… a broader representation of host systems. The lemurs of Madagascar, a phylogenetically and ecologically diverse primate group, include 45 folivorous species that vary in their evolutionary relationships, dietary niches, and habitat occupation. From 2013-2018, I and my collaborators collected …
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Home Range and Provisioning Use of Semi-Free-Ranging Ringtailed Lemurs (Lemur Catta)
… Free-ranging troops of ringtailed lemurs have been managed on SCI since 1985 and are monitored and provisioned daily. There has been no assessment of the effects of provisioning or seasonal dependence on provisioning to date. Ringtailed lemur troop home ranges and use of provisions …
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Variation in susceptibility to parasite infection: patterns, determinants and consequences in red-fronted lemurs
Parasiten stellen wichtige ökologische und evolutionäre Faktoren dar, die einen starken modulierenden Effekt auf natürlich vorkommenden Tierpopulationen ausüben können. Vor allem im Zusammenhang mit Mechanismen der sexuellen Selektion, wird der Einfluss von Parasiten auf die Wirtspopulation als …
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Environmental Drivers of Dispersal in Black-and-White Ruffed Lemurs (<i>Varecia variegata</i>)
… and dispersal characteristics of ruffed lemurs in the region; and 3) Combine data from objectives 1 and 2 to evaluate the short-range environmental drivers of ruffed lemur dispersal and functional connectivity across the RNP-COFAV region, and compare findings to previously identified …
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Use of a Two-Action Paradigm Apparatus with Captive Lemurs: Insights into Social Learning
Lemurs have been understudied in cognitive research despite possessing a unique phylogenetic position as the lineage linking primates to other mammals. I used a two-action paradigm apparatus to test social learning abilities in seven lemur species at the Duke Lemur Center. There were three groups: …
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Nutrient composition of foodstuffs available to wild lemurs living in the Analamazaotra Special Reserve, eastern Madagascar, and a survey of diets fed to captive black-and-white ruffed lemurs at United States zoological institutions
Lemurs are a group of primates endemic to Madagascar, an island off the southeastern coast of Africa. The International Union for Conservation of Nature (IUCN) lists 39 of the 93 recognized species of lemur in Threatened categories, including the Endangered diademed sifaka (Propithecus diadema) and …
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Behavioural ecology of sympatric lemur species Lemur catta and Eulemur sp. In forest fragments, south-eastern Madagascar
… niche partitioning between native ring-tailed lemurs, Lemur catta, and an introduced hybrid brown lemur population of Eulemur rufus x E. collaris in Malaza gallery forest of Berenty reserve, in comparison with the natural sympatric population of ring-tailed lemurs and red collared brown lemurs, …
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Reassessing the Ranging Behavior of Black-And-White Ruffed Lemurs (Varecia variegata) in Ranomafana National Park, Madagascar
<p>This study investigates black-and-white ruffed lemur (<em>Varecia variegata</em>) space use and movement using autocorrelated kernel density estimation (AKDE), a new methodology available from the continuous-time movement model (ctmm) package in R. Data were collected from 24 adults and …
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The use of a novel scent enrichment to improve captive primate welfare and its potential application to conservation breeding
… sex identification and advertising fertility. Lemurs which rely on olfactory communication are a conservation priority and modern zoos have a role in contributing to their conservation with captive breeding programmes. But mismatches between zoo and wild environments may lead to welfare …
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Primate-Plant Interactions in the Tropical Dry Forests of Northwestern Madagascar: Seed Dispersal and Sensory Ecology of Eulemur fulvus.
… Here, I measure the interrelatedness of brown lemurs (Eulemur fulvus) and the endemic fruits they disperse in the tropical dry forests of Ankarafantsika National Park, northwestern Madagascar. I analyze fruit traits across all fruits consumed by brown lemurs over the course of one year of …
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Encounters in the forest: Social and ecological dimensions of lemur hunting, habitat change and biodiversity conservation in south-east Madagascar
… and characterise their relationships with lemurs and other wild animals. Most wild mammals and birds are considered to be acceptable food, with certain exceptions proscribed by ancestral practices. Contrary to Euro-western narratives, lemurs are not given special importance. Red-collared …
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Examining Environmental Use by Captive <i>Lemur catta</i> and <i>Varecia rubra</i>
<p>There are over 100 named species of lemurs, of which 94% are considered threatened with extinction by the International Union for the Conservation of Nature (IUCN). They live in increasingly fragmented forests. To understand how best to protect them in their natural habitats, we can observe how …
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Role of Provisions and Season on Foraging and Female Dominance Behavior in Ring-Tailed Lemurs (Lemur Catta) on St. Catherine's Island
… its unique species, including ring-tailed lemurs. Ring-tailed lemurs (Lemur catta) live in matriarchal groups composed of a dominant female, adult males, subadult males and females, and young. Due to their dominance, it has been suggested that female ringtailed lemurs have access to the …
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The Biodiversity Mirage: the Effects of Habitat Degradation and Exotic Predators on Ground-Dwelling Forest Birds, Tenrecs and Lemurs in Northeastern Madagascar
… birds, tenrecs (Lipotyphla: Tenrecidae) and lemurs to habitat degradation and the presence of exotic predators, and monitor population trends at resurveyed sites from 2008 to 2013. Using camera trap surveys and distance sampling, we observed 26 bird species (n = 4,083 observations), three …
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Lemurs as protectors of the forest: Red-collared brown lemur seed dispersal, forest regeneration, and local livelihoods in the littoral forest fragments of southeastern Madagascar
… affected the ecology of red-collared brown lemurs (Eulemur collaris) in two littoral forests in southeastern Madagascar (Sainte Luce, Mandena). Since 1999, 14 behavioural studies have been conducted on this lemur species in these littoral forests, focusing on their diet, behaviour, activity …
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Salivary Biomarkers of Acute Stress and Insulin Sensitivity in Nonhuman Primates
… mangabeys (Cercocebus chrysogaster), red ruffed lemurs (Varecia rubra) and mongoose lemurs (Eulemur mongoz). Hormones were analyzed with enzyme kinetic or immunoassays. Our study validated tools for analyzing alpha-amylase, cortisol, and insulin in saliva for those species. No significant …
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Ecological flexibility and conservation of Fleurette's sportive lemur, Lepilemur fleuretae, in the lowland rainforest of Ampasy, Tsitongambarika Protected Area
… to different environmental conditions. Sportive lemurs Lepilemur spp. are known to minimise energetic costs via short distances travelled, small home ranges, increased resting time, and low metabolic rates. Very little information, however, is available in the eastern rainforest, the habitat …
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Understanding female social dominance: comparative behavioral endocrinology in the Genus Eulemur
… in mammals, yet characterizes most Malagasy lemurs, which represent almost 30% of all primates. Despite its prevalence in this suborder, both the evolutionary trajectory and proximate mechanism of female dominance remain unclear. Potentially associated with female dominance is a suite of …
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