Jesus Martinez

Jesus Martinez
Wildlife Conservation Society - Bolivia | WCSBOLIVIA · Research

MSc

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29
Publications
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222
Citations

Publications

Publications (29)
Article
Full-text available
In the face of reduced food availability, primates must choose between expending energy to look for adequate foraging options, or saving energy by reducing activity and intake requirements. In a 1-year study of two groups of Olalla’s titi monkey (Plecturocebus olallae) in the fragmented forests of the Llanos de Moxos, Bolivia, we assessed seasonal...
Article
Full-text available
Population size is crucial knowledge for biodiversity conservation. The Olalla's titi monkey (Plecturocebus olallae) is endemic to Bolivia and one of the most threatened primate species in the Neotropics. We report a new occurrence zone for this species that increases their previously known distribution from 267.4 to 383.4 km². With a playback poin...
Article
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For arboreal primates, ground use may increase dispersal opportunities, tolerance to habitat change, access to ground-based resources, and resilience to human disturbances, and so has conservation implications. We collated published and unpublished data from 86 studies across 65 localities to assess titi monkey (Callicebinae) terrestriality. We exa...
Article
The genetic variability of New World primates is still poorly documented. We present the first genetic study on two threatened endemic titi monkey species in northern Bolivia (Plecturocebus modestus and Plecturocebus olallae) using six microsatellite markers to investigate genetic structure and variability of 54 individuals from two wild population...
Article
Full-text available
Long-range vocal communication in socially monogamous titi monkeys is mediated by the production of loud, advertising calls in the form of solos, duets, and choruses. We conducted a power spectral analysis of duets and choruses (simply “duets” hereafter) followed by linear discriminant analysis using three acoustic parameters—dominant frequency of...
Article
Full-text available
The international trade in night monkeys (Aotus spp.), found throughout Central and South America, has been regulated by the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) since 1975. We present a quantitative analysis of this trade from all 9 range countries, over 4 decades, and compare domestic legislation...
Article
Primate territorial calls have been used to locate groups in censuses. Daily variations in call rates are a potential source of error in these studies. To obtain more accurate estimations of population density it is necessary to determine how much variation there is in group call rates and to identify the factors that influence them. We present dat...
Article
Full-text available
Desde 1939, Callicebus olallae y C. modestus han sido considerados primates endémicos para Bolivia, aunque por más de 60 años sólo se conocían las localidades donde se obtuvieron los especímenes para su descripción. Para determinar el estado de conservación de ambas especies, la Sociedad para la Conservación de la Vida Silvestre realizó distintos e...
Article
Full-text available
Estado Plurinacional de Bolivia, Departamento de La Paz, Provincia Franz Tamayo, Municipio Apolo, Parque Nacional y Área Natural de Manejo Integrado Madidi, TCO Pueblo Indígena de San José de Uchupiamonas, Campamento Corazón del Madidi, cerca de encuentro al arroyo Eslabón y río Tuichi (14°32'32.58"S 67°45'44.91"W; 288 m.s.n.m.). Colectores: Jesús...
Article
Full-text available
Intestinal parasite diversity was evaluated in two groups of free-ranging Callicebus modestus from the José Ballivián Province of the Beni Department, Bolivia. During 10 months (September 2010 to June 2011) fecal samples were collected from an adult pair (group A), and a second group (group B) living in a less fragmented area than group A composed...
Chapter
The south-western Beni forest–grassland mosaic in central western Bolivia, a natural fragmented forest area, is home to two Bolivian primate endemics: the Beni titi monkey (Callicebus modestus) and the Olalla brothers titi monkey (Callicebus olallae). Despite extremely low sample sizes (n = 1 and n = 2, respectively), these species have been consis...
Chapter
Full-text available
The forests of the western Amazonia, from Colombia south through Ecuador, Peru and Bolivia, are home to at least 30 taxa of pitheciines of the genera Pithecia, Cacajao and Callicebus. The primary threat to these monkeys is habitat destruction, although hunting further threatens populations in some areas. One taxon in this region is considered criti...
Chapter
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Article
Full-text available
Presentamos información acerca de las áreas de distribución de los dos primates endémicos de Bolivia, Callicebus olallae y C. modestus, mediante la visita de localidades en el departamento del Beni. Callicebus olallae fue registrado en 4 localidades y C. modestus en 11 localidades, y en combinación con datos negatives y localidades para otras espec...
Article
Full-text available
Se estudiaron las variaciones temporales de los patrones de riqueza de especies y abundancia de murciélagos de los gremios frugívoro, insectívoro y nectarívoro, durante 25 meses en un bosque montano de Yungas, Bolivia. En la época seca, la abundancia de individuos y la riqueza de especies de frugívoros y nectarívoros fue mayor, mientras que los ins...
Article
We studied temporal variation in species richness and abundance of bats of three trophic guilds: frugivorous, insectivorous, and nectarivorous, over 25 months in a Montane Yungas Forest of Bolivia. Species richness and abundance of frugivorous and nectarivorous bat was greater in dry season than in wet season, whereas insectivore bats were better r...

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