Apesar de Alouatta guariba clamitans apresentar ampla distribuição na Mata Atlântica, do rio Doce (ES) ao rio Camaquã (RS) e a oeste até o norte da Argentina. The social group of the brown howler monkey, Alouatta guariba clamitans Cabrera, is typically small (2–12 individuals), with one or two adult males, and. Adult females are covered in dark brown or reddish brown hair. A latitudinal color gradient occurs in the subspecies Alouatta guariba clamitans. Males tend to be.

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Furthermore, for the purpose of this modelling exercise, we assumed that this population occupies a habitat area that has a K of 50 individuals through time. Yellow fever in Brazil: Immobility and silence are clamitahs used as antipredatory tactics. Chiarello, b ; da Cunha and Jalles-Filho, Rubbing behavior in brown howlers serves a variety guarlba functions. Ecologia e comportamento de Alouatta guariba clamitans Cabrera, Atelidae: Universidade Estadual de Campinas, Campinas.

With a constant encounter rate but a higher transmission rate, the frequency of outbreaks and the probability that the population will go extinct, increases significantly Fig.

Seasonal and age-related differential mortality by sex in the mantled howler monkey, Alouatta palliata.

Does inbreeding and loss of genetic diversity decrease disease resistance? The geographical distribution of immunity to yellow fever among the primates of Brazil.

Dental disorders in brown howler monkeys (Alouatta guariba clamitans) maintained in captivity.

A Primatologia no Brasil — 3. Los Nombres cientificos de algunos monos americanos. Socioecology, population fragmentation and patterns of genetic loss in endangered primates.

Bull World Health Organ. Species description – Definition of extinction – Extinction was defined in the model as no animals of one or both sexes remain. This led to a latent period of days. Biotropicaguaribz 1: The median value estimated from analysis of studbook data for 40 captive mammal populations was 3.


The baseline model in Outbreak was shown to be highly useful to estimate and visualise the different stages of transition in a howler population impacted by clajitans YF outbreak.

Sensitivity analysis – Both severity and frequency of YF have an impact on the rate of extinction of brown howler monkeys. Paim, Fernando de C. Table II presents a summary of the input parameters used for the Outbreak model.

The baseline Vortex howler monkey demographic model, linked to the baseline Outbreak model of YF epidemiology, showed an annual stochastic population growth rate of Brown howlers are one of the largest leaf-eating primates in the South American guariab. Pre-susceptible state – We assume that all newly-born individuals become susceptible to YF immediately after birth, except in cases when a mother has recovered from infection with the pathogen.

Southern brown howler

In this approach, the output of one clamitanns can modify inputs to another model e. The baseline model of YF disease epidemiology predicted a very high probability of population decline over the next years. Journal of Human Evolution, Conservation biology of the genus Alouatta.

Tese Doutorado em Ecologia. Incubation period – To estimate this parameter we considered two alternative ways.

Therefore, it is impossible not to consider the encounter rate as a function of a combination of factors: In each of these scenarios, only one parameter value was changed, with all other input parameters set at their baseline values.

Members of Alouatta are best known for their howls that closely resemble grunts or barks. However, if the outbreak only hits one or two of the populations, then the probability of extinction decreases.

Intrinsic rate of natural increase in Neotropical forest mammals: In Brazil, brown howlers are the only primate species on the protected island Ilha do Cardososo. Social structure of Alouatta guariba clamitans: Neotropical Primates, 13 2: Livro de Resumos do Accessed March 15, at http: They have relatively large, stocky frames with pelage that varies in color from brown to dark red or black.


Two yellow fever outbreaks in howler monkeys in northeastern Argentina seriously affected populations of southern brown howlers.

IUCN Red List of Threatened Species

To model infectious processes, the state of each individual in the population is tracked and the probabilities of transition among states are specified as functions of the number of individuals in each state and of other relevant parameters, such as the contact rate and the latent period of infection.

Environmental factors such as unpredictable rainfall, fluctuating temperatures and limiting resources to feed young are all likely to have a significant effect on juvenile mortality in general Ralls et al. Scenario settings – Duration of simulation – Life expectancy of howlers is approximately years in the wild. These factors range from 0 maximum or absolute effect to 1 no effect and are imposed during the single year of the catastrophe, after which time the demographic rates can rebound to their baseline values.

Two complementary modelling tools were used to evaluate brown howler population dynamics in the presence of the disease: Fruit consumption depends on location and can be a significant part the brown howler diet depending on availability. Habitat, density and group size of primates in a Brazilian tropical forest. One hundred years is far enough into the future so as to decrease the chances of omitting a yet unknown event, but also not too short to fail to observe a slowly developing event.