| [studies on trypanosoma cruzi disease and wild vector reservoirs. xxxii. natural infection of the monkey, callicebus nigrifrons(spix, 1823) t. cruzi]. | | 1969 | 4978007 |
| titi monkeys combine alarm calls to create probabilistic meaning. | previous work suggested that titi monkeys callicebus nigrifrons combine two alarm calls, the a- and b-calls, to communicate about predator type and location. to explore how listeners process these sequences, we recorded alarm call sequences of six free-ranging groups exposed to terrestrial and aerial predator models, placed on the ground or in the canopy, and used multimodel inference to assess the information encoded in the sequences. we then carried out playback experiments to identify the fea ... | 2019 | 31123704 |
| a new species of amblyomma (acari: ixodidae) associated with monkeys and passerines of the atlantic rainforest biome, southeastern brazil. | recent studies have reported several larvae of an unidentified amblyomma species on passerine birds in atlantic rainforest fragments in southeastern brazil. these larvae yielded a unique 16s rrna haplotype designated as amblyomma sp. haplotype nazaré, which showed nucleotide identity levels of 91% to amblyomma parkeri fonseca & aragão, 1952 and 88% to amblyomma longirostre (koch, 1844). herein, we describe amblyomma sp. haplotype nazaré as a new species, amblyomma romarioi n. sp. martins, luz & ... | 2019 | 31320285 |
| active anti-predator behaviour of red titi monkeys (plecturocebus cupreus). | due to their inconspicuous behaviour and colouration, it has been assumed that titi monkeys' main anti-predator behaviour is passive crypsis and hiding. so far, active predator mobbing has been documented only for black-fronted titi monkeys, callicebusnigrifrons. here we report for the first time mobbing behaviour of red titi monkeys, plecturocebus cupreus (previously callicebus cupreus), as reaction to an ocelot (leopardus pardalis) and a boa constrictor. we also report other active anti-predat ... | 2019 | 32110716 |
| should i store, or should i sync? the breeding strategy of two small neotropical primates under predictable resource availability. | primates employ many strategies to deal with the costs of reproduction. while income breeders exploit the food available in their environment during lactation, the most costly phase of reproduction, capital breeders tend to store energy for use in the period. we analyzed the relationship between resource availability and lactation in callicebus coimbrai (n = 2 groups) and callicebus nigrifrons (n = 2 groups) in four brazilian atlantic forest remnants, to assess their breeding strategy. we record ... | 2019 | 30788624 |
| sleeping above the enemy: sleeping site choice by black-fronted titi monkeys (callicebus nigrifrons). | the costs imposed by predation may result in behavioral adaptations to reduce mortality risk, including the choice and use of sleeping sites. the threat of predation, however, is rarely the sole force shaping sleeping site choice, which is likely to reflect other factors such as foraging needs as well. here we describe the use of sleeping sites by three groups of small neotropical monkeys, the black-fronted titi monkeys (callicebus nigrifrons), and evaluate the role of predation pressure and for ... | 2017 | 28763579 |
| mining noise affects loud call structures and emission patterns of wild black-fronted titi monkeys. | anthropogenic noise pollution is increasing and can constrain acoustic communication in animals. our aim was to investigate if the acoustic parameters of loud calls and their diurnal pattern in the black-fronted titi monkey (callicebus nigrifrons) are affected by noise produced by mining activity in a fragment of atlantic forest in brazil. we installed two passive acoustic monitoring devices to record sound 24 h/day, 7 days every 2 months, for a year; one unit was close to an opencast mine and t ... | 2017 | 28894994 |
| the diet of wild black-fronted titi monkeys callicebus nigrifrons during a bamboo masting year. | black-fronted titi monkeys, callicebus nigrifrons, are endemic primates of the atlantic forest of brazil, and little is known about their diet and how it is affected by seasonal changes. the aim of this study is to analyze the diet of c. nigrifrons during a bamboo masting year. this study was conducted in the reserve rppn santuário do caraça, mg, and the collection of data was carried out from january 2007 to january 2008 through monthly campaigns. the feeding behaviour of four habituated groups ... | 2012 | 22311072 |
| estimating primate population densities: the systematic use of playbacks along transects in population surveys. | accurate measures of animal population densities are essential to assess their status, demography, and answer ecological questions. among several methods proposed to collect abundance data, line transect sampling is used the most. the assumptions required to obtain accurate density estimates through this method, however, are rarely met when studying primates. as most primate species are vocally active, density estimates can be improved by associating transect sampling with playback point counts ... | 2017 | 27464028 |
| foraging strategies of black-fronted titi monkeys (callicebus nigrifrons) in relation to food availability in a seasonal tropical forest. | many primates have to cope with a temporal scarcity in food availability that shapes their foraging strategies. here we investigated the changes in diet, activity, and ranging behavior of a group of black-fronted titi monkeys (callicebus nigrifrons) according to the availability of the main high-nutritional-density item in their diet and the foraging strategy adopted when this food is scarce. we monitored one habituated group using instantaneous scan sampling over 1 year (533 h of observation, 6 ... | 2017 | 27485746 |
| chromosome painting in callicebus nigrifrons provides insights into the genome evolution of titi monkeys and the ancestral callicebinae karyotype. | we studied the chromosomes of callicebus nigrifrons with conventional and molecular cytogenetic methods. our chromosome painting analysis in c. nigrifrons together with previous reports allowed us to hypothesize an ancestral callicebinae karyotype with 2n = 48. the associations of human chromosomes (hsa) 2/22, 7/15, 10/11, and the inverted hsa2/16 would link callicebus, cheracebus, and plecturocebus and would thus be present in the ancestral callicebinae karyotype. four fusions (hsa1b/1c, 3c/8b, ... | 2017 | 28278505 |
| Feeding ecology and activity pattern of black-fronted titi monkeys (Callicebus nigrifrons) in a semideciduous tropical forest of southern Brazil. | Most aspects of the ecology and behavior of Callicebus nigrifrons are still unknown. The information available about this species is mainly based on a few studies that also focused on other Callicebus. We examined the feeding behavior and activity pattern of a free-ranging pair of C. nigrifrons between March and November 2007 in an area of semideciduous tropical forest of southeastern Brazil. The study site is located at the southern limit of the Tropical Zone and is characterized by pronounced ... | 2011 | 21861115 |
| naturally acquired visceral leishmaniasis in non-human primates in brazil. | visceral leishmaniasis (vl) is a chronic and often fatal protozoal disease that is endemic in belo horizonte (state of minas gerais, brazil). leishmania sp. is an intracellular obligatory parasite of macrophages that can naturally infect several mammalian species. non-human primates (nhp) have been used as experimental models for infection with leishmania of the donovani complex. the present report describes a case of visceral leishmaniasis in a black-fronted titi. among 41 primates kept in capt ... | 2010 | 20056328 |
| a case of adoption in a wild group of black-fronted titi monkeys (callicebus nigrifrons). | we observed a case of infant adoption in an unprovisioned group of wild black-fronted titi monkeys (callicebus nigrifrons). during our long-term field study we noticed that an infant had moved from one of our study groups ("desbotado") to another ("rio"). observations of the adoptive group confirm that it was being cared for by the adult male, and initially the group's adult female was nursing the infant alongside her biological infant. interestingly, the native and adoptive groups have frequent ... | 2008 | 17938856 |
| observed case of maternal infanticide in a wild group of black-fronted titi monkeys (callicebus nigrifrons). | a maternal infanticide was observed in a group of unprovisioned wild black-fronted titi monkeys (callicebus nigrifrons). an approximately 3-day-old male infant was killed by his mother. a post-mortem revealed the infant to be clinically healthy. we considered various hypotheses to explain why this behavior occurred (e.g., reproductive advantage, stress, nutritional, infant viability and population density). it is noteworthy that the mother and not the father killed the infant, since in this spec ... | 2008 | 17938855 |
| can roads be used as transects for primate population surveys?. | line transect distance sampling (ltds) can be applied to either trails or roads. however, it is likely that sampling along roads might result in biased density estimates. in this paper, we compared the results obtained with ltds applied on trails and roads for two primate species (callithrix penicillata and callicebus nigrifrons) to clarify whether roads are appropriate transects to estimate densities. we performed standard ltds surveys in two nature reserves in south-eastern brazil. effective s ... | 2012 | 22854794 |
| titi monkey call sequences vary with predator location and type. | animal alarm calls can encode information about a predator's category, size, distance or threat level. in non-human primates, alarm calls typically refer to broad classes of disturbances, in some instances to specific predators. here, we present the results of a field experiment with a new world primate, the black-fronted titi monkey (callicebus nigrifrons), designed to explore the information conveyed by their alarm call system. adults produced sequences consisting of two main alarm call types ... | 2013 | 24004492 |
| vocal behavior of black-fronted titi monkeys (callicebus nigrifrons): acoustic properties and behavioral contexts of loud calls. | loud calls can be heard over long distances due to their high amplitude and low frequency. these calls are commonly used for both within- and between-group communication in many bird and primate species. in the neotropics, mated pairs of socially monogamous titi monkeys (genus callicebus) emit conspicuous, coordinated loud calls. these vocalizations appear to play a role in territorial defense, a hypothesis derived from studies of only three of the 31 recognized callicebus species. here, we desc ... | 2014 | 24591251 |
| patch size, functional isolation, visibility and matrix permeability influences neotropical primate occurrence within highly fragmented landscapes. | forest fragmentation and habitat loss are among the major current extinction causes. remaining fragments are mostly small, isolated and showing poor quality. being primarily arboreal, neotropical primates are generally sensitive to fragmentation effects. furthermore, primates are involved in complex ecological process. thus, landscape changes that negatively interfere with primate population dynamic affect the structure, composition, and ultimately the viability of the whole community. we evalua ... | 2015 | 25658108 |
| playback responses of socially monogamous black-fronted titi monkeys to simulated solitary and paired intruders. | many birds and primates use loud vocalizations to mediate agonistic interactions with conspecifics, either as solos by males or females, or as coordinated duets. the extensive variation in duet complexity, the contribution of each sex, and the context in which duets are produced suggest that duets may serve several functions, including territory and mate defense. titi monkeys (callicebus spp.) are believed to defend their home range via solo loud calls or coordinated duets. yet there are remarka ... | 2015 | 26194463 |