Common Marmosets
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Cooperação em sagüis comuns callithrix jacchus: condições e restrições
The cooperative behavior is no longer a dilemma for the theory of evolution, since there are models that explain the evolution of this behavior by means of natural selection at the individual level. However, there have been few studies on the proximal factors that interfere with cooperative behavior. In the study of the influence of cognition on cooperation,
Publicado em: 2010
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2. Resposta comportamental e hormonal de machos não reprodutores de sagüi, callithrix jacchus, a estímulos sensoriais de filhotes não aparentados
Parental care in mammals is influenced by somatosensory stimuli from infants, such as vocalization and sight and by changes in the hormone levels of caretakers. The aim of this study was to evaluate the behavioral and hormonal responses of twelve non reproductive adult male common marmosets (Callithrix jacchus) to infant cues, vocalization recordings, sight
Publicado em: 2009
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3. Effects of caffeine on memory in common marmosets (Callithrix jacchus) / Efeitos da cafeína sobre a memória de saguis (Callithrix jacchus)
A cafeína é considerada a droga psicoativa mais utilizada no mundo, apresentando diversos efeitos centrais e periféricos. No Sistema Nervoso Central, o principal efeito ocorre via bloqueio de receptores para adenosina A1 e A2a, que mediam a indução do sono de ondas lentas. O bloqueio destes receptores por alimentos ou bebidas que contenha cafeína acarr
Publicado em: 2009
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4. Expressão de genes imediatos induzidos por vocalizações em sagüis-comuns (Callithrix jacchus)
Immediate-early genes (IEGs) expression has been widely used as a valuable tool to investigate brain areas activated by specific stimuli. Studies of natural vocalizations, specially in songbirds, have largely benefited from this tool. Here we used IEGs expression to investigate brain areas activated by the hearing of conspecific common marmoset (Callithrix j
Publicado em: 2008
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5. Caracterização do ritmo de atividade motora durante a puberdade em sagüis (Callithrix jacchus) sob condições semi-naturais
Most of ontogenetic studies on circadian timing system have been developed on infants, adults and elderly. The puberty has not been a stage of life few studied, except for researches in human adolescents, that presents phase delay in sleep-wake cycle. However, few studies have focused on the basis of this circadian change due to methodological diffic
Publicado em: 2008
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6. Efeitos de vocalizações de co-específicos e do escuro sobre o ritmo circadiano da atividade motora em sagüis (Callithrix jacchus)
The principal zeitgeber for most of species is the light-dark photocycle (LD), though other environment factors as food availability, temperature and social cues may act. Daily adjustment of the circadian pacemaker may result from integration of environmental photic and non-photic cues with homeostatic cues. Characterization of non-photic effects on circadia
Publicado em: 2007
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7. Colheita, análise e criopreservação de sêmen de uma espécie modelo de primata neotropical, Sagui-de-Tufo-Branco (Callithrix jacchus) / Collection, analysis and cryopreservation of semen from a model species, the common marmoset (Callithrix jacchus)
The Callithrix jacchus can be used as a model species for other Neotropical primates species, mainly Callithriquids, for reproductive studies. Semen samples were collected with the following objectives: to improve the penile vibrostimulation technique, validate sperm evaluation techniques for field work, analyse the semen characteristics from animals at 2 co
Publicado em: 2007
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8. Ãrea domiciliar e utilizaÃÃo de recursos alimentares por sagÃis Callithrix jacchus na Reserva Particular do PatrimÃnio Natural â RPPN Nossa Senhora do Outeiro de MaracaÃpe, Ipojuca, PE
Two groups of common marmoset, Callithrix jacchus (A and B), were monitored between May and November 2006 in a Restinga (a coastal ecosystem of the Atlantic Forest) private reserve in the municipality of Ipojuca, state of Pernambuco, NorthEast of Brazil (08031â48ââS 35001â05ââW, at the sea level). The main objective was to analyze the diet composition
Publicado em: 2007
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9. Hierarquia social e sucesso alimentar em callithrix jacchus (Primates, Callithrichidae), sob condições naturais
A vida em grupo implica em competição por recursos entre os indivíduos. Competição do tipo Scramble é considerada um modo indireto de competição, associado principalmente a fatores como tamanho do grupo e distribuição dos recursos no ambiente. Competição do tipo Contest ocorre quando indivíduos competem diretamente por recursos. Em espécies suj
Publicado em: 2007
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10. Contested dominance modifies the anovulatory consequences of social subordination in female marmosets
Dominance status among female marmosets is reflected in agonistic behavior and ovarian function. Socially dominant females receive submissive behavior from subordinates, while exhibiting normal ovulatory function. Subordinate females, however, receive agonistic behavior from dominants, while exhibiting reduced or absent ovulatory function. Such disparity in
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-05
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11. Padrão de atividades do sagüi callithrix jacchus numa área de caatinga
Callithrix jacchus, as the other species in the family Callitrichidae, lives in social groups. The groups cam be found in different habitats, whose distinct floristic physiognomies and communities are intrinsically related to their behavioral ecology and social relations. Our objective was to describe the social relations and feeding behavior of Callithrix j
Publicado em: 2006
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12. Circadian rhythms in blood pressure in free-ranging three-toed sloths (Bradypus variegatus)
Blood pressure (BP) profiles were monitored in nine free-ranging sloths (Bradypus variegatus) by coupling one common carotid artery to a BP telemetry transmitter. Animals moved freely in an isolated and temperature-controlled room (24ºC) with 12/12-h artificial light-dark cycles and behaviors were observed during resting, eating and moving. Systolic (SBP) a
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-02