Browsing by Autor "Alfredo Fuentes"

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    A Revision of Bidens (Asteraceae: Coreopsideae) from Bolivia
    (Missouri Botanical Garden, 2024) Mabel A. Lizarazu; Stephan Beck; Alfredo Fuentes; Susana E. Freire
    The genus Bidens L. is the largest genus of the Coreopsideae that comprises about 280 species with a global distribution in tropical and temperate climates. An account of the 12 species and three varieties of Bidens occurring in Bolivia is provided, i.e., B. andicola Kunth var. andicola, B. andicola var. heterophylla Kuntze, B. aurea (Aiton) Sherff, B. cynapiifolia Kunth, B. exigua Sherff, B. gardneri Baker, B. herzogii (Sherff) D. J. N. Hind, B. mandonii (Sherff) Cabrera, B. pilosa L., B. pseudocosmos Sherff, B. squarrosa Kunth, B. subalternans DC. var. subalternans, B. subalternans var. simulans Sherff, B. tenera O. E. Schulz, and B. triplinervia Kunth var. macrantha (Wedd.) Sherff. The following three taxa are placed in synonymy: B. buchtienii Sherff is synonymized under B. andicola var. heterophylla; and B. andicola var. tarijensis Sherff and B. andicola f. dissecta Sherff under B. triplinervia var. macrantha. Diodonta coronata (L.) Nutt. is selected as the generitype of Diodonta Nutt. (= Bidens), and 23 lectotypes are designated: one for B. andicola, one for B. andicola var. heterophylla, one for B. gardneri, nine for names applicable to B. pilosa, one for B. pseudocosmos, five for names applicable to B. squarrosa, one for a name applicable to B. tenera, five for names applicable to B. triplinervia var. macrantha; and an epitype is proposed for the name B. odorata Cav. Four taxa are excluded from Bolivia, i.e., B. bipinnata L., B. reptans (L.) G. Don, B. rubifolia Kunth, and B. grandiflora Balb. var. longiloba Kuntze for which specimens have not been traced that confirmed their occurrence in Bolivia. Bidens subalternans var. simulans and B. aurea are reported for the first time from Bolivia. Descriptions, distribution maps, identification key, illustrations, and local vernacular names of all taxa are provided.
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    Censo aéreo de guanacos Lama guanicoe en el Chaco cruceño
    (2000) Erika Cuéllar; Alfredo Fuentes
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    Chemical properties of foliar metabolomes represent a key axis of functional trait variation in forests of the tropical Andes
    (Royal Society, 2026) Sierra Chadwick; David Henderson; Arden Perkins; Leslie Cayola; Alfredo Fuentes; Belen Alvestegui; Nathan Muchhala; J. Sebastián Tello; Martin Volf; J. Wilson Myers
    Plants interact with their environment through diverse specialized metabolites that protect them from abiotic stressors, like drought or radiation, and biotic stressors, like herbivores or pathogens. However, few studies have considered the chemical properties of metabolites as a potential axis of functional trait variation along environmental gradients. Here, we examined how the chemical properties of foliar metabolomes, such as mean aromaticity, hydrophobicity and polarity, as well as commonly used morphological traits, vary with climate and elevation among 16 forest plots in the tropical Andes of Bolivia. We found that chemical properties were weakly related to morphological traits among tree species, yet both varied significantly with climate and elevation. In particular, abundance-weighted mean hydrophobicity decreased, and polar surface area increased with elevation and in colder and drier climates. Additionally, co-occurring species showed increasing chemical similarity with elevation for the most-aromatic and most-polar metabolites. These results suggest that abiotic stress associated with colder, drier climates and solar radiation acts as a filter for metabolome chemical properties. This contrasts with chemical dissimilarity observed at lower elevations, which is likely driven by pressure from host-specialized enemies in warmer, wetter climates. Our results introduce the possibility that chemical defences may be constrained by abiotic stressors.
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    Frecuencia de los síndromes de dispersión de semillas en un gradiente altitudinal de valle interandino en Bolivia
    (2020) Ángel J. Claure-Herrera; Vanesa Serrudo G.; Lucia Blanco L.; Yanela C. Echazu T.; Daniel Nino Flores-Mendez; Eduardo Aguirre M.; Stephan Beck; Emilia Garcia E.; Freddy S. Zenteno-Ruíz; Alfredo Fuentes
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    Materials to the revision of the genus Cranichis (Orchidaceae) in Bolivia
    (2026) Marta Kolanowska; Konrad Kaczmarek; Slawomir Nowak; Alfredo Fuentes
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    Materials to the revision of the genus Cranichis (Orchidaceae) in Bolivia
    (Pensoft Publishers, 2021) Marta Kolanowska; Przemysław Baranow; Sławomir Nowak; Alfredo Fuentes
    The diversity of <i>Cranichis</i> in Bolivia is evaluated. An updated key for identifying species is provided. Morphological characteristics of 15 species of Bolivian <i>Cranichis</i> are presented together with illustrations of their floral segments. The occurrence of <i>C.diphylla</i>, <i>C.lehmannii</i>, and <i>C.muscosa</i> in this country was not confirmed. In our opinion the previously published Bolivian record for <i>C.polyantha</i> is doubtful. For the first time, <i>C.badia</i> and <i>C.longipetiolata</i> are reported in this country. Two new species of <i>Cranichis</i> are described.
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    Recent growth increase in endemic Juglans boliviana from the tropical Andes
    (Elsevier BV, 2023) Rose Oelkers; Laia Andreu‐Hayles; Rosanne D’Arrigo; Arturo Pacheco-Solana; Milagros Rodríguez‐Catón; Alfredo Fuentes; Guaciara M. Santos; Ernesto Tejedor; M. Eugenia Ferrero; Carla Maldonado
    The spatial coverage of tree-ring chronologies in tropical South America is low compared to the extratropics, particularly in remote regions. Tree-ring dating from such tropical sites is limited by the generally weak temperature seasonality, complex coloration, and indistinct anatomical morphology in some tree species. As a result, there is a need to complement traditional methods of dendrochronology with innovative and independent approaches. Here, we supplement traditional tree-ring methods via the use of radiocarbon analyses to detect partial missing rings and/or false rings, and wood anatomical techniques to precisely delineate tree-ring boundaries. In so doing we present and confirm the annual periodicity of the first tree-ring width (TRW) chronology spanning from 1814 to 2017 for Juglans boliviana (‘nogal’), a tree species growing in a mid-elevation tropical moist forest in northern Bolivia. We collected 25 core samples and 4 cross-sections from living and recently harvested canopy-dominant trees, respectively. The sampled trees were growing in the Madidi National Park and had a mean age of 115 years old, with certain trees growing for over 200 years. Comparison of (residual and standard) TRW chronologies to monthly climate variables shows significant negative relationships to prior year May-August maximum temperatures (r = −0.54, p < 0.05) and positive relationships to dry season May-October precipitation (r = 0.60, p < 0.05) before the current year growing season. Additionally, the radial growth of Juglans boliviana shows a significant positive trend since 1979. Our findings describe a new and promising tree species for dendrochronology due to its longevity and highlight interdisciplinary techniques that can be used to expand the current tree-ring network in Bolivia and the greater South American tropics.
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