Daniel Larrea-Alcázar

Daniel Larrea-Alcázar
Universidad Mayor de San Andres | UMSA · Herbario Nacional de Bolivia

Doctor en Ecología Tropical

About

75
Publications
38,125
Reads
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445
Citations
Education
June 2003 - February 2007
University of the Andes (Venezuela)
Field of study
  • Ecología Tropical
April 2001 - February 2003
University of Chile
Field of study
  • Ecología y Biología Evolutiva
February 1992 - June 1998
Universidad Mayor de San Andres
Field of study
  • Biologia

Publications

Publications (75)
Article
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Spatial associations between columnar cacti and mimosoid shrubs were evaluated in an Andean semidesert enclave. An analysis on the capacity of other deciduous shrub species and medium-sized ephemeral plants to modify the spatial distribution of cacti was also included. The number of Stenocereus griseus (Haw.) F. Buxb., Cereus repandus (L.) Backeb....
Article
Full-text available
The geographical dichotomy hypothesis suggests that columnar cacti in the tropics depend primarily on bats for pollination. This dependence may to be less in the outer tropics where many columnar cactus species (or their populations) show a relatively generalized pollination system with both nocturnal (moths and bats) and diurnal pollinators (bees...
Article
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We estimate plant species richness of Bolivian Andean dry valleys applying the species/genus ratio of Compositae to all reported genera for those regions. The results suggest the existence of around 1500 species in the Bolivian dry valleys (12.6% more than the species recorded). A brief biogeographical analysis of our results suggests that the use...
Article
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Question: What is the effect of shrubs on herbaceous species richness at three spatial scales: quadrat, site, and region? Location: Prepuna, subtropical semi-arid Andes. Methods: At eight sites, we recorded the presence of herbaceous species in spaces beneath shrubs/small trees and in open areas. At the quadrat scale, the average species number p...
Article
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Documenting temporal trends in the extent of ecosystems is essential to monitoring their status but combining this information with the degree of protection helps us assess the effectiveness of societal actions for conserving ecosystem diversity and related ecosystem services. We demonstrated indicators in the Tropical Andes using both potential (...
Book
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The Science Panel for the Amazon (SPA) is an unprecedented initiative convened under the auspices of the United Nations Sustainable Development Solutions Network (SDSN). The SPA is composed of over 200 preeminent scientists and researchers from the eight Amazonian countries, French Guiana, and global partners. These experts came together to debate,...
Book
Los picaflores o colibríes forman un grupo singular de aves de tamaño pequeño, colores llamativos y brillantes, pico fino y lengua larga que, además, tienen una asombrosa capacidad de maniobra en vuelo. De hecho, pueden mantenerse suspendidos en el aire frente a una flor y luego volar hacia atrás o en cualquier dirección para buscar néctar, polen o...
Chapter
The objective of this chapter is to identify the main economic processes that occurred in the Brazilian, Andean, and Guyanese Amazon during the nineteenth and twentieth centuries until the 1970s. Specifically, the chapter describes the history of extractivism and the effects of geopolitical reconfiguration in the Amazon after the processes of emanc...
Chapter
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This chapter presents country-specific descriptions of human intervention in the Amazon. In general, a rapid expansion of agricultural and extractive activities, mostly for export but also for domestic markets, and to a lesser degree small scale agriculture, have led to extensive deforestation and environmental degradation without substantially imp...
Chapter
This Report provides a comprehensive, objective, open, transparent, systematic, and rigorous scientific assessment of the state of the Amazon’s ecosystems, current trends, and their implications for the long-term well-being of the region, as well as opportunities and policy relevant options for conservation and sustainable development.
Chapter
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En la naturaleza, las especies interactúan entre sí, ya sea para conseguir su alimento, para poder reproducirse o para escapar de sus depredadores. De todas las interacciones entre diferentes especies, aquellas que se establecen entre plantas y animales son muy importantes para asegurar la permanencia, tanto de las plantas como de los animales que...
Article
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As Bolivia approaches presidential elections in October 2019, the country’s environmental leadership is at stake. We discuss urgent challenges and opportunities for reconciling conservation and societal needs in this mega-diverse country.
Article
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As Bolivia approaches presidential elections in October 2019, the country’s environmental leadership is at stake. We discuss urgent challenges and opportunities for reconciling conservation and societal needs in this mega-diverse country.
Article
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The fast expansion of human population around La Paz, Bolivia (3,200–4,100 m.a.s.l.) triggered new suburban settlements in nearby areas in valleys and mountain feet. The white mesquite, Prosopis alba Griseb. (Leguminosae), is a resource (originally used by native communities) that is strongly affected by changes in land use. A gradient in the level...
Article
Full-text available
The fast expansion of human population around La Paz, Bolivia (3200-4100 m.a.s.l.) triggered new suburban settlements in nearby areas in valleys and mountain foots. The white mesquite, Prosopis alba Griseb. (Leguminosae), is a resource (originally used by native communities) that is strongly affected by changes in land use. A gradient in the level...
Article
Full-text available
The geographic dichotomy hypothesis suggests that columnar cacti inhabiting the tropics depend on flower visitors (birds, bats) for their pollination, showing highly specialized animal-pollinated systems. This dependence could be less strong in the southern hemisphere tropics where several cactus species show generalized pollination systems, which...
Article
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In this study, we evaluated the geographical distribution of the Brazil nut in Bolivia, and the impact on its populations caused by deforestation from 2010 to 2015. Specifically: a) we modeled the distribution of the species using the Maxent algorithm in order to confirm if its distribution is restricted to the humid tropical forests of the norther...
Article
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En este estudio, examinamos la distribución geográfica de la castaña y el impacto de la deforestación ocurrida entre los años 2010 y 2015. Específicamente: a) modelamos la distribución de la especie usando el algoritmo Maxent para confirmar si su distribución se encuentra restringida a los bosques tropicales húmedos del norte de Bolivia, b) usando...
Technical Report
Full-text available
Brochure which to show the ACEAA work in relation to sustainable management of Brazil nuts in an indigenous territory located in the northern Bolivian Amazonian.
Article
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El objetivo de este estudio fue conocer la estructura diamétrica y el patrón espacial de Bertholletia excelsa (Bonpl., Lecythidaceae) en la TCO Tacana II, ubicada al norte de la Amazonía boliviana. La TCO cuenta con 53.424 árboles censados de B. excelsa, distribuidos en una superficie de cerca de 1.780 Km2. Para el análisis de patrones espaciales s...
Article
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In this study, we evaluated the representation of biogeographical units in national (NPA) and subnational (SPA) protected areas, as well as in officially recognized indigenous territories (IT) of Bolivia. We compiled available cartographic information on Bolivia’s NPA, SPA and IT, and compared it with Navarro & Ferreira’s (2009) suggested proposal...
Article
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En este estudio, evaluamos la pérdida potencial de carbono causada por la deforestación reciente (2010-2013) ocurrida en las tierras bajas y Yungas de Bolivia. Examinamos de forma específica la magnitud y pérdida de carbono ocurrida en áreas protegidas nacionales y territorios indígenas titulados (TCO o TIOC). Utilizamos como línea de base los resu...
Technical Report
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Deforestación en la Amazonía (1970-2013) es un estudio inédito sobre la pérdida de bosques en la región amazónica de cada uno de los países que la componen. De toda la historia de ocupación de la Amazonía se considera que hasta un 9,7% de la región habría sido deforestada hasta el año 2000, y que entre ese año y el 2013 dicho porcentaje subió a 13,...
Article
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Causas directas de la deforestación reciente (2000-2010) y modelado de dos escenarios futuros en las tierras bajas de Bolivia Resumen Se presentan los resultados de un estudio detallado sobre la dinámica de deforestación en las tierras bajas de Bolivia ocurrida entre 2000 y 2010. Específicamente se analizaron los tres usos del suelo que constituyen...
Article
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We present a detailed study of the dynamics of deforestation in the Bolivian lowlands between 2000 and 2010. In the first analysis, we evaluate the contributions of the three main proximate causes of deforestation: Mechanized agriculture, small-scale agriculture and cattle ranching in replacement of forests. The impact of cattle ranching was strong...
Article
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Through the review of catalogs, herbarium specimens and information available online, we compiled a database consisting of 5,748 records from 594 species of native grasses of Bolivia (mean ± standard deviation, 9 ± 11.3), which represent the 71% of total recorded species to Bolivia). Using the algorithm Maxent, the potential distribution of each sp...
Article
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Distribution patterns of palms, particularly species richness along latitudinal and altitudinal gradients in Bolivia, are still unknown. A species distribution model was used to identify areas with potentially high palm species richness and endemism. Two models were used: the environmental niche model and a deductive model. A map of potential palm...
Article
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Current economic growth models encourage natural resource-rich countries to become suppliers of raw materials for growing capital markets which severely affect conditions of large natural areas such as the western Amazon Basin, one of the most biodiverse regions on Earth. The process will accelerate as this region becomes more accessible with the d...
Article
Full-text available
Current economic growth models encourage natural resource-rich countries to become suppliers of raw materials for growing capital markets which severely affect conditions of large natural areas such as the western Amazon Basin, one of the most biodiverse regions on Earth. The process will accelerate as this region becomes more accessible with the d...
Technical Report
Full-text available
Book
Full-text available
En el marco del III Congreso Boliviano de Ecología que se realizó en Sucre del 16 al 18 de noviembre de 2011, el Dpto. de Ciencias de FAN organizó el simposio “Modelaje de distribución de especies y aplicaciones en ecología y conservación”. En el país se han desarrollado recientemente investigaciones para modelar patrones de distribución de especie...
Article
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Amphibians constitute one of the most threatened species group worldwide. Because they are affected by various threats such as habitat destruction, chytrid fungus, climate change, invasive species and human use, different approaches are needed for their conservation. In this paper we examine patterns of alpha diversity, endemism and threatened spec...
Article
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Understanding large-scale patterns of beta- and alpha diversity is essential for ecoregional conservation planning. Using the 110,000 km2 shallow basin of the Beni savannas of northeastern Bolivia, we examined the spatial patterns of biological diversity of four taxonomic groups (bats, palms, reptiles, and amphibians). Since the Beni savannas are s...
Article
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We conducted a point pattern analysis of dominant woody and cactus species in a permanent plot located in the little known semi-arid Andes (Prepuna region) for gaining insight into community dynamics and, specifically, to determine the microhabitat (beneath or away from shrubs) where shrubs and cacti tend to recruit. Several null models were employ...
Article
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Generalmente se acepta que fue Tansley (1935) quien originalmente acuñó el concepto de ecosistema. Su definición enfatizaba que la distribución de especies y su ensamblaje estaban fuertemente influidos por el ambiente asociado; es decir, la comunidad biótica constituía una unidad integral con su entorno físico, al cual llamó " ecosistema ". Si bien...
Article
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The Beni savannas (locally referred to as pampas) is composed of two clearly differentiated ecoregions, the Llanos de Moxos (or Moxos) and the Beni Cerrado. Both tropical savannas are shaped to a greater (Moxos) or lesser (Beni Cerrado) by cycles of drought and flood and the labor of generation of farmers. It contains floristic elements of four bio...
Chapter
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Desde 1999 venimos realizando estudios destinados a permitirnos tener una amplia noción de los factores que determinan la estructura y función de nuestros ecosistemas áridos y semiáridos. Es muy poco lo que se conoce sobre los desiertos con lluvias estrictamente estivales. Entre otras cosas, estos poseen muchos endemismos, además de genotipos que p...
Article
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In this study, we analyzed the spatial pattern of Parodia maassii, a globose cactus of the subtropical Andes. Specifically, we evaluated the relation between the spatial pattern of this cactus species and dominant woody strata of the locality where the study took place. Our data showed a marked clustered pattern of P. maassii in 1-10 m patches, sug...
Article
Full-text available
In this study, we analyzed the spatial pattern of Parodia maassii, a globose cactus of the subtropical Andes. Specifically, we evaluated the relation between the spatial pattern of this cactus species and dominant woody strata of the locality where the study took place. Our data showed a marked clustered pattern of P. maassii in 1-10 m patches, sug...
Article
We compared the relative importance of chemical alellopathy, pruning behaviour of resident ants and other non-related agents to ant-plant mutualism for seedling establishment beneath Triplaris americana L. (Polygonaceae), a myrmecophyte plant. We also included a preliminary analysis of effects of fragmentation on these ecological processes. Seeds a...
Article
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Mecanografiado Tesis (Doctorado) -- Universidad de Los Andes, Facultad de Ciencias, Instituto de Ciencias Ambientales y Ecológicas, Doctorado en Ecología Tropical, Mérida, 2007 Incluye bibliografía
Article
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The role of three thorny legume species as nurse plants and competitive relationships with columnar cacti were evaluated in a semiarid enclave of the Venezuelan Andes. Abundance and size of three columnar cacti species (Stenocereus griseus, Cereus repandus and Pilosocereus tillianus) under isolated shrubs of three thorny legumes species (Prosopis j...
Article
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La disponibilidad de recursos alimenticios es uno de los factores más importantes que afectan la dieta y comportamiento de forrajeo de murciélagos frugívoros. En este estudio examinamos la composición del gremio de murciélagos frugívoros en la Estación Biológica Tunquini (EBT) – Cotapata y pusimos a prueba la hipótesis de que la dieta de murciélago...