Browsing by Autor "Daniel Villarroel"

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A new species and new records of Myrtaceae from the Noel Kempff Mercado National Park region of Bolivia
(Springer Science+Business Media, 2013) Daniel Villarroel; Carolyn Elinore Barnes Proença
A new species of Escallonia (Escalloniaceae) from the inter-Andean tropical dry forests of Bolivia
(PeerJ, Inc., 2019) Felipe Zapata; Daniel Villarroel
Over the last two decades, renewed fieldwork in poorly explored areas of the tropical Andes has dramatically increased the comparative material available to study patterns of inter- and intraspecific variation in tropical plants. In the course of a comprehensive study of the genus Escallonia, we found a group of specimens with decumbent branching, small narrowly elliptic leaves, inflorescences with up to three flowers, and flowers with red petals. This unique combination of traits was not present in any known species of the genus. To evaluate the hypothesis that these specimens belonged to a new species, we assessed whether morphological variation between the putative new species and all currently known Escallonia species was discontinuous. The lack of overlap in tolerance regions for vegetative and reproductive traits combined with differences in habit, habitat, and geographic distribution supported the hypothesis of the new species, which we named Escallonia harrisii. The new species grows in sandstone inter-Andean ridges and cliffs covered with dry forest, mostly on steep slopes between 1,300-2,200 m in southern Bolivia. It is readily distinct in overall leaf and flower morphology from other Escallonia species in the region, even though it does not grow in sympatry with other species. Because E. harrisii is locally common it may not be threated at present, but due to its restricted geographic distribution and the multiple threats of the tropical dry forests it could become potentially vulnerable.
A new species of Myrciaria and botanical novelties in the family Myrtaceae for Bolivia
(Q15088586, 2025) Daniel Villarroel; Oriana Anyhely Lino-Villalba; Liliana Arroyo-Herbas; Bente Klitgaard
Myrciaria coimbrarum (tribe Myrteae, subtribe Pliniinae), a new species endemic to the Serranía Chiquitana and the Abayoy vegetation (department of Santa Cruz, Bolivia), is described. Myrciaria coimbrarum is compared with M. cuspidata which is the most similar species. In addition, Myrcianthes minimifolia is here reported as a new record for the Bolivian flora. Furthermore, for the Catalogue of Vascular Plants of Bolivia, the name Eugenia stictopetala should replace E. tapacumensis (= synonym of E. stictopetala) and Myrciaria tenella should be excluded, since as all the Bolivian specimens previous identified with this name correspond to M. cuspidata.
ANÁLISIS DE LA ADOPCIÓN DE LAS NICSP Y SU INFLUENCIA EN LA PERCEPCIÓN DE CORRUPCIÓN EN CHILE PERÍODO 2016-2023
(2025) Daniel Villarroel; Brandon Montecino Vilches
La implementación de las Normas Internacionales de Contabilidad del Sector Público, NICSP, en Chile busca mejorar la transparencia y calidad de la información financiera, un paso esencial para reducir la corrupción. Estas normas promueven la uniformidad en los reportes financieros y fomentan la rendición de cuentas, con objeto de incrementar la confianza ciudadana en las instituciones. Sin embargo, los desafíos técnicos y culturales ligados a la adopción de las NICSP requieren estrategias específicas. Se perciben altos niveles de corrupción en el sector público chileno, a pesar de los esfuerzos para implementar normas contables internacionales que promuevan la rendición de cuentas y la transparencia. Se analizó si la adopción de las NICSP ha contribuido efectivamente a prevenir la corrupción en Chile en la última década, identificando mecanismos anticorrupción, interpretando indicadores de percepción de la corrupción y los efectos de las NICSP en la transparencia y eficiencia entre 2016 y 2023. Se utilizó una metodología mixta que incluyó análisis documental, encuestas a expertos y revisión de datos del índice de percepción de la corrupción. La información fue sistematizada en cuadros comparativos y se aplicaron criterios de calidad como confirmabilidad y fiabilidad para asegurar la validez de los resultados. Finalmente, si bien las NICSP han fortalecido los procesos de auditoría y la rendición de cuentas en Chile, persisten limitaciones significativas, como la falta de recursos y capacitación, especialmente a nivel municipal. Esto sugiere que el impacto anticorrupción de las NICSP sería limitado sin ajustes en el marco legal y mayor inversión en capacidad técnica.
Astronium woodii (Anacardiaceae), a new species from Bolivia
(Springer Science+Business Media, 2021) Daniel Villarroel; Maira T. Martinez-Ugarteche; Germaine Alexander Parada; Bente Klitgaard
Eleven new records of little known taxa of Mesosetum and Paspalum (Poaceae) from Brazil and Bolivia
(Q15088586, 2016) Anádria Stéphanie da Silva; Daniel Villarroel; André Rodolfo de Oliveira Ribeiro; Regina Célia de Oliveira
New records of Poaceae in Brazil and Bolivia are documented from expeditions, collections and review of herbarium specimens. Eleven new records are confirmed and comments, IUCN Threatened Species Categories and illustrations for these taxa are provided. Mesosetum comatum and M. filifolium are new records for Brazil, and M. ansatum is a new record for Bolivia. Paspalum burchellii, P. lepton, P. oteroi and P. trinitense are new records for Bolivia.
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
Eugenia veadeirensis, a new species of Myrtaceae from the highlands of Goiás (Central Brazil) and new miscellaneous records for the Brazilian flora
(Q15088586, 2018) Daniel Villarroel; Jair Eustáquio Quintino Faria; Ana W. Quevedo; M. Y. López; Vanessa Iribarrem Avena Miranda; Bente Klitgaard; Carolyn Elinore Barnes Proença
We describe Eugenia veadeirensis, a new species endemic to the Chapada dos Veadeiros from Brazil. The species most similar to E. veadeirensis is E. michaelneei. However, there are 14 morphological characteristics which differentiate them. In addition, we report Aspilia cardenasii, Bougainvillea praecox, Calea rhombifolia, Cleistocactus samaipatanus, Dimerostemma asperatum and Varronia multicapitata as new records for the Brazilian flora.
FLORA DO MATO GROSSO DO SUL: MYRTACEAE
(Fundación Zoobotánica de Rio Grande do Sul, 2018) Carolyn Elinore Barnes Proença; Lúcia Helena Soares-Silva; Daniel Villarroel; Kadja Milena Gomes-Bezerra; Priscila Oliveira Rosa; Jair Eustáquio Quintino Faria; Marcos Sobral
Proença, Carolyn Elinore Barnes, Soares-Silva, Lucia Helena, Villarroel, Daniel, Gomes-Bezerra, Kadja Milena, Rosa, Priscila Oliveira, de Faria, Jair Eustáquio Quintino, Sobral, Marcos (2018): Flora do Mato Grosso do Sul: Myrtaceae. Iheringia, Série Botânica 73: 277-282, DOI: 10.21826/2446-8231201873s277, URL: http://dx.doi.org/10.21826/2446-8231201873s277
Handroanthus abayoy, a new species of Bignoniaceae endemic from Bolivia
(2026) Daniel Villarroel; G. Alexander Parada; Maira T. Martinez-Ugarteche; Bente B. Klitgaard
Handroanthus abayoy, a new species of Bignoniaceae endemic from Bolivia
(Q15088586, 2022) Daniel Villarroel; Germaine Alexander Parada; Maira T. Martinez-Ugarteche; Bente Klitgaard
Handroanthus abayoy is a new species endemic to the southern region of the department of Santa Cruz, Bolivia. Morphologically the most similar species to H. abayoy is H. selachidentatus, both species are part of Tabebuia group II according to the classification proposed by Grose & Olmstead (2007). However, the two species have a different geographic distribution, and at least 15 morphological characteristics, both vegetative and reproductive, that distinguish one from the other.
In splendid isolation: a new cloud forest species expands the distribution of Myrceugenia (Myrtaceae) into Las Yungas and adds a new genus to the flora of Bolivia
(Q15088586, 2024) Carolyn Elinore Barnes Proença; Fábio Christiano Speck Vieira; Paulo Takeo Sano; Daniel Villarroel
Myrceugenia is a temperate or subtropical genus of c. 50 species with a disjunct distribution across South America. The ‘western’ species occur in central Chile and north-western Argentina with one species in the Juan Fernández Islands. The ‘eastern’ species occur in Uruguay, southern Brazil, and marginal regions of Argentina and Paraguay, reaching montane eastern Brazil (two isolated taxa in Central Brazil). It is hypothesized that Myrceugenia once grew across the temperate forests of southern South America, but that oceanic transgressions and the elevation of the Andes during the Miocene divided its populations as the forests retracted from the centre of the continent. The Las Yungas floristic province is a strip of cool, temperate forest that runs along the eastern slopes of the Andes from Venezuela to northern Argentina; Myrceugenia was not known to occur there. We report the discovery of a new species of Myrceugenia in southern Las Yungas (Bosque Tucumano Boliviano). It is distinct from all other species of the genus by the combination of solitary flowers, sub-ancipitate hypanthium, bilocular locules, and 12-13 clustered ovules. The phylogeny of Myrceugenia shows geographic structuring with three basal western clades and one derived eastern clade. The isolated taxa of Myrceugenia from Central Brazil were sisters, respectively, to the rest of the eastern clade and to one of its two subclades, suggesting that isolated taxa are relictual. The discovery of this species has made Myrceugenia the only genus of Myrtaceae to grow in the three cool, humid forests of southern South America.
Lowland Wetlands of Bolivia: Landscapes, Conservation, and Livelihoods
(2025) Moraes R. Mónica; Daniel M. Larrea‐Alcázar; Daniel Villarroel; José D. Soto
Bolivia's lowland wetlands cover a vast landscape at altitudes of 80–500 m. There are 19 wetland units—four in the “Llanos de Moxos” and four in the Pantanal—which are part of two river basins: Amazon and Paraná–Paraguay. Both lowland wetland complexes are described in terms of their climate, hydrodynamics, and biota. Emblematic species include Victoria amazonica , palms ( Mauritia flexuosa, Copernicia alba ), Pteronura brasiliensis, Inia boliviensis, Blastocerus dichotomus, Eunectes murinus , crocodiles, waterfowl, and fishes, among others. Seven protected areas cover half of the wetlands, while seven have been declared Ramsar Sites. Human occupation dates back to the early Holocene, and productive systems have been recorded. Local communities shaped the meso-relief to take advantage of natural resources and water management under seasonal regimes, and their cultures have maintained this legacy.
New botanical discoveries in Eugenia (Myrtaceae) from Bolivia and Brazil
(Q15088586, 2016) Daniel Villarroel; Jair Eustáquio Quintino Faria; ALÉXIA MORAES BELMONT; Suelí Maria Gomes; Carolyn Elinore Barnes Proença
Eugenia michaelneei is a new Bolvian species endemic to the Meseta de Chochís and the Serranía de Santiago de Chiquitos in eastern Santa Cruz Department. It is closely related to E. sonderiana, but differs mainly by its small height, low number of secondary veins, midvein glabrescent on the abaxial surface and glabrous on the adaxial surface, and few ovules per locule. Nineteen differences in their leaf anatomy were also recorded although they share a dorsiventral mesophyll. Eugenia repanda and E. corrientina are reported as new occurrences for Bolivia and Brazil respectively.
New botanical discoveries of Myrtaceae from Bolivia and notes on Psidium hians
(Q15088586, 2015) Daniel Villarroel; Kadja Milena Gomes-Bezerra
A new species, Myrcia proencana is described from eastern Bolivia. It is known from the Serranía de Huanchaca in the Noel Kempff Mercado National Park. M. proencana is compared with M. torta which is the species most similar. Also, we determined that Psidium hians should be considered as an accepted name, and P. nutans should be included in its synonymy. Additionally, Eugenia paranahybensis, E. pitanga, E. suberosa, Psidium misionum and P. myrsinites are reported as new records for the Bolivian flora.
One New and One Long-lost Species ofEugenia(Myrtaceae) from the Bolivian Cerrado
(Missouri Botanical Garden Press, 2014) Daniel Villarroel; Jair Eustáquio Quintino Faria; Carolyn Elinore Barnes Proença
Two species of Eugenia L. (Myrtaceae) within Eugenia sect. Umbellatae O. Berg, E. teresa-ruiziana Villarroel & Faria and E. cydoniifolia O. Berg, are described and illustrated. The former is a new species, whereas the latter has not been collected since 1842. Both species are endemic to the cerrados of the Lomerío region of eastern Bolivia. This article examines and discusses the vegetative and reproductive characteristics that distinguish these species, which include the leaf morphology, indumentum type, secondary vein number, stamen number, and ovule number per locule.Dos especies de Eugenia L. (Myrtaceae) dentro de la Eugenia sect. Umbellatae O. Berg, E. teresa-ruiziana Villarroel & Faria y E. cydoniifolia O. Berg, se describen e ilustran. La primera es una nueva especie, mientras que la segunda no se había colectado desde 1842. Ambas especies son endémicas de los cerrados de la región de Lomerío del este de Bolivia. En este artículo se examinan y discuten las características vegetativas y reproductivas que diferencian estas especies, siendo estas: la morfología foliar, tipo de indumento, número de venas secundarias, número de estambres, y el número de óvulos por lóculo.
Peer Review #2 of "A new species of Escallonia (Escalloniaceae) from the inter-Andean tropical dry forests of Bolivia (v0.1)"
(2019) Felipe Zapata; Daniel Villarroel; Gabriel Ren; Moreno; Petal; Apg; R Pennington; J Beaulieu; B O'meara; K De Queiroz
Over the last two decades, renewed fieldwork in poorly explored areas of the tropical Andes has dramatically increased the comparative material available to study patterns of inter-and intraspecific variation in tropical plants.In the course of a comprehensive study of the genus Escallonia, we found a group of specimens with decumbent branching, small narrowly elliptic leaves, inflorescences with up to three flowers, and flowers with red petals.This unique combination of traits was not present in any known species of the genus.To evaluate the hypothesis that these specimens belonged to a new species, we assessed whether morphological variation between the putative new species and all currently known Escallonia species was discontinuous.The lack of overlap in tolerance regions for vegetative and reproductive traits combined with differences in habit, habitat, and geographic distribution supported the hypothesis of the new species, which we named Escallonia harrisii.The new species grows in sandstone inter-Andean ridges and cliffs covered with dry forest, mostly on steep slopes between 1,300 -2,200 m in southern Bolivia.It is readily distinct in overall leaf and flower morphology from other Escallonia species in the region, even though it does not grow in sympatry with other species.Because E. harrisii is locally common it may not be threated at present, but due to its restricted geographic distribution and the multiple threats of the tropical dry forests it could become potentially vulnerable.
Relación de la cobertura leñosa con la riqueza herbácea en tres fisionomías del Cerrado "sensu lato" (Cerro Mutún, Santa Cruz, Bolivia)
(2009) Daniel Villarroel; Jesus Nazareno Pinto; Teresa Ruíz de Centurión; Alexander Parada
Respuesta taxonómica y funcional del ensamblaje de aves a megaincendios en la región sur de la Chiquitania (Santa Cruz, Bolivia)
(Universidade Federal de Goiás, 2023) Marco Aurelio Pinto-Viveros; Ericka Michelle Peñaranda; Daniel Villarroel
Frente a la ocurrencia de megaincendios durante 2019 en el ACIE Ñembi Guasu, evaluamos la respuesta de la ornitofauna para evidenciar la severidad del impacto. Se cuantificaron valores de riqueza, diversidad específica (números de Hill), abundancia (pruebas de Kruskal-Wallis), recambio taxonómico (análisis de correspondencia) y diversidad funcional (números de Hill) que, fueron contrastados entre áreas quemadas y no quemadas de cobertura boscosa; este contraste entre áreas se realizó para la época húmeda y también para la seca del 2020. Las áreas quemadas congregaron alta riqueza en época húmeda (27 spp), que se redujo para la seca (15 spp); las áreas no quemadas presentaron una riqueza constante durante ambas épocas (25 y 24 spp). La diversidad y abundancia no varió significativamente. La similitud taxonómica entre áreas fue baja (35,6% húmeda; 14,3% seca). En época húmeda, la diversidad funcional se incrementó en áreas quemadas, disminuyendo drásticamente para la seca. Se concluyó que, los megaincendios presentaron un impacto altamente negativo sobre el ensamblaje ornitológico, principalmente en los atributos de riqueza específica, riqueza funcional y composición taxonómica, así también, que la llegada de la época seca desfavoreció en gran medida a la resiliencia del ecosistema quemado.
Una nueva especie de Eugenia (Myrtaceae) del Cerrado boliviano
(Springer Science+Business Media, 2014) Daniel Villarroel; KADJA MILENA GOMES–BEZARRA; Carolyn Elinore Barnes Proença