Browsing by Autor "Juan Carlos Catari"

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A new species of Ceiba (Malvaceae, Bombacoideae), previously confused with Ceiba speciosa
(Q15088586, 2024) Heinz Arno Drawert; Alcibiades A. Angulo; Juan Carlos Catari
Based on the review of herbarium specimens, geo-referenced live images, and field observations, a new species of the genus Ceiba (Malvaceae) is described. Ceiba camba, the new species, has previously been confused with other species in the Ceiba insignis complex, specially with C. speciosa, and went undifferentiated despite having a wide distribution in the lowlands of central-western South America and being quite common. However, the new species here described shows clear visible morphological differences from C. speciosa and the other members of the genus. The main similarities and differences with other morphologically and geographically close species of the C. insignis complex (C. chodatii, C. crispiflora, C. insignis, C. lupuna, C. pubiflora, C. speciosa) are discussed.
Building a large-scale surface gravity network in Colombia using highly redundant measurements
(De Gruyter Open, 2025) Franco S. Sobrero; Michael Bevis; Demián D. Gómez; Arturo Echalar; Paola Montenegro; Eric Kendrick; Ariele Batistti; Lizeth Contreras Choque; Juan Carlos Catari; Elio B. Yucra Saavedra
Abstract This article presents a large-scale surface gravity network in Colombia, developed during a 3-year collaboration between Ohio State University (OSU) and Colombia’s national mapping agency, the Instituto Geográfico Agustín Codazzi . The network spans approximately one-third of the country’s surface area and consists of 498 stations, including 22 absolute gravity (AG) constraints. We applied the OSU field protocol and adjustment technique, extending it to address the challenge of traffic-induced noise at benchmarks located near major roads. Our methodology employed measurements with an unusually high degree of redundancy, with 87% of the gravity lines surveyed using a minimum of four relative gravimeters. Additionally, we utilized both automatic (Scintrex CG-6) and manual (LaCoste and Romberg Model G) instruments to leverage their complementary strengths in different environments. The resulting gravity values were determined with a typical uncertainty (1 sigma) of ± 0.03 mGal. The leave-one-out cross-validation tests using the AG stations demonstrated the robustness of our solution, with all residuals statistically indistinguishable from zero. Our findings show that the combination of enhanced observational redundancy and the use of multiple gravimeter types effectively mitigates measurement challenges under suboptimal conditions, with only a modest increase in field time.
Ceiba guarani (Malvaceae, Bombacoideae), a new species from sub-Andean southern Bolivia and the Sierras of northwestern Argentina
(Instituto de Botánica del Nordeste, 2024) Juan Carlos Catari; Heinz Arno Drawert; Alcibiades A. Angulo
Based on observations made during botanical surveys in the southern sub-Andean of Bolivia, analysis of collected material, review of herbarium material and online databases, we determined that the Ceiba populations of the xeric Bolivian-Tucuman forests, previously identified as Ceiba chodatii, correspond to a new species. Given that the morphological, ecological and distributional characteristics differ from those observed in populations of C. chodatii, we propose Ceiba guarani sp. nov. Our field observations and distribution data from the revised specimens indicate that C. chodatii is naturally restricted to the Chaco plains and a strip of the southern Subandean foothills, whereas Ceiba guarani is distributed mainly in the Subandean ranges.
Diagnóstico biológico preliminar y prioridades de investigación en el área protegida municipal Parabanó
(2004) Kathia Rivero; Damián I. Rumiz; Juan Carlos Catari; Huáscar Azurduy; Oswaldo Maillard; L. Acosta; Miguel Angel Aponte; Karina Osinaga; Grimaldo Soto; Humberto Saavedra
Estructura, composición y diversidad arbórea de dos áreas de Cerrado sensu stricto de la Chiquitanía (Santa Cruz, Bolivia)
(2010) Daniel Villarroel; Juan Carlos Catari; Denis Calderon; Ronald Mendez; Ted R. Feldpausch