Circadian rhythms in diet and habitat use in red ruffed lemurs (<i>Varecia rubra</i>) and white‐fronted brown lemurs (<i>Eulemur fulvus albifrons</i>)

Vasey, Natalie

doi:10.1002/ajpa.10357

Cited by 22 publications

(28 citation statements)

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“…In the coastal forest troop, only small open patches, such as gaps or rocky coasts are available. Chimpanzees and lemurs are also known to stay in the higher parts of the canopy when it is cold to receive more sunlight [Takemoto, 2004;Vasey, 2004] as well as macaques in the coastal forest. The canopy height in the coniferous forest reaches 30 m, but in the coastal forest it is often less than 5 m. Since the canopy is low in the coastal forest, they can access it to receive sunlight more easily than in the coniferous forest.…”

Section: Selection Of Microhabitatsmentioning

confidence: 99%

Behavioral thermoregulation of wild Japanese macaques: comparisons between two subpopulations

Hanya

Kiyono

Hayaishi

2007

American J Primatol

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We studied the behavioral thermoregulation of Japanese macaques in two troops that live in the coniferous (1,000-1,200 m in elevation) and coastal forests (0-200 m in elevation) of Yakushima. Frequency of sunbathing, huddling, and microhabitat selection during inactivity was compared. The difference in mean annual air temperature between the forests was more than 7 degrees C. In both forests, when the weather was clear, macaques spent more time being inactive in the sunshine in winter than in autumn. In winter, they huddled more often when it was clear than when cloudy. Microhabitat selection to stay in the sunshine during winter differed between the two forests. In winter, macaques spent more time inactive in open habitats in the coniferous forest and in the trees in the coastal forest than in autumn, respectively. This difference is related to the lower crown height in the coastal forest and the large open habitats (logged area) available only in the coniferous forest. In winter, skin temperature measured by temperature-sensitive transmitters was 1.32-1.71 degrees C higher when sunbathing, and 0.83-4.75 degrees C higher when huddling than staying in the shade without huddling. In winter, the proportion with which they stayed in the sunshine or huddled in winter did not differ between the two forests, in spite of the difference in air temperature. This suggests that Japanese macaques respond to seasonal changes in air temperature, not the absolute temperature, and that they acclimatize themselves to thermal conditions that require behavioral thermoregulation only during the season when thermoregulation is most costly.

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Section: Selection Of Microhabitatsmentioning

confidence: 99%

Behavioral thermoregulation of wild Japanese macaques: comparisons between two subpopulations

Hanya

Kiyono

Hayaishi

2007

American J Primatol

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“…Varecia relies chiefly on ripe fruit (e.g., Morland, 1991a;Rigamonti, 1993;Vasey, 2000a), which is one of the most clumped and ephemeral food resources in a rainforest. At Andranobe, V. rubra was shown to have a far more spatially and temporally patchy diet than sympatric E. fulvus albifrons (Vasey, 1996(Vasey, , 1997a. A variety of traits increase reproductive costs of Varecia relative to other primates.…”

Section: Body Size Diet and Reproduction In Vareciamentioning

confidence: 99%

“…The only departure from this uniform ranging pattern concerns daily distances traveled during female reproductive stages; males resemble females in traveling farther during lactation than gestation. Concomitantly, food resources used by males are farther apart (i.e., spatially patchier) when females are lactating compared to when they are pregnant (Vasey, 1996(Vasey, , 1997a.…”

Section: Ranging Patterns Social Organization and Reproductionmentioning

confidence: 99%

“…During the cold rainy season and ensuing gestation months, females use smaller forest areas, travel shorter daily distances, and confine themselves entirely to their respective core areas. This dispersion of core females into their respective core areas adds a higher-level component to their fission-fusion social system, and occurs when their food resources are closer together (Vasey, 1996(Vasey, , 1997a. When females lactate, especially during the food-abundant hot rainy season, they use larger forest areas, travel longer daily distances, and enter other core areas, affiliating with members of other core groups in temporary subgroups that vary daily in membership, size, sex composition, and duration.…”

Section: Ranging Patterns Social Organization and Reproductionmentioning

confidence: 99%

“…Morland (1990) demonstrated that lactating V. variegata females spent more time feeding than nonlactating females, and Sauther (1998) demonstrated that pregnant Lemur catta ate more energy-rich foods than males and timed their most costly reproductive stages with specific resource availability. Particularly germane here, diet, activity budgets, and activity rhythms are all known to vary in V. rubra females in tandem not only with seasons, but also with reproductive stages (Vasey, 2000a(Vasey, , 2002(Vasey, , 2004(Vasey, , 2005.…”

Section: Introductionmentioning

confidence: 98%

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Impact of Seasonality and Reproduction on Social Structure, Ranging Patterns, and Fission–Fusion Social Organization in Red Ruffed Lemurs

Vasey

Developments in Primatology: Progress and Prospect

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New developments in the behavioral ecology and conservation of ruffed lemurs (Varecia)

Vasey

2005

American J Primatol

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The papers in this issue were presented at a symposium during the 25th Annual Meeting of the American Society of Primatologists held in Oklahoma City, Oklahoma, in June 2002. This symposium brought together many of the scientists who have contributed to our knowledge of ruffed lemur ecology, behavior, and conservation in the past decade. One objective was to share and compare key findings about ruffed lemurs (Varecia) resulting from long-term field studies at various sites in Madagascar. A second objective was to cross-fertilize work being done in the wild with that being done in captivity, with the aim of advancing a common conservation mission for this critically endangered genus. Varecia is a prime candidate for synthetic assessments such as these because it has now been studied in both the northern and southern reaches of its geographic range, and has also been the focus of a captive-to-wild reinforcement project. The papers in this issue contribute to 1) the establishment of reference ranges for a suite of physiological parameters in healthy wild Varecia populations; 2) environmental enrichment aimed at preserving species-typical behaviors in captivity; 3) an understanding of how forest structure, floristic composition, and fruiting phenology in areas with differing disturbance histories correlate with the natural occurrence and abundance of Varecia; 4) primary knowledge concerning dominance relations between the sexes and group leadership in wild Varecia; and 5) primary knowledge concerning how wild Varecia, with their unusual reproductive pattern and heavy reliance on fruit, modulate their activity budgets seasonally and in tandem with reproductive stages. Am. J. Primatol. 66:1-6, 2005.

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Circadian rhythms in diet and habitat use in red ruffed lemurs (Varecia rubra) and white‐fronted brown lemurs (Eulemur fulvus albifrons)

Cited by 22 publications

References 50 publications

Behavioral thermoregulation of wild Japanese macaques: comparisons between two subpopulations

Behavioral thermoregulation of wild Japanese macaques: comparisons between two subpopulations

Impact of Seasonality and Reproduction on Social Structure, Ranging Patterns, and Fission–Fusion Social Organization in Red Ruffed Lemurs

New developments in the behavioral ecology and conservation of ruffed lemurs (Varecia)

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