Browsing by Autor "Isaac Goldstein"

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Áreas emergentes: una herramienta metodológica en el estudio de los paisajes
(2005) Nubis Pulido; José Jesús Rojas López; Isaac Goldstein; Joel Francisco Mejía; Gladys Zuleima Molina
SUMARIO / SUMMARY \n\n\n\n 1.- Editorial \n\n\n La Facultad de Ciencias Forestales y Ambientales y el deterioro del ambiente.\nThe Faculty of Forestry and Environmental Science and the environment damage.\nTrinca Fighera, Delfina\n\n\n\n\n 2.- Artículos / Papers \n\n\nLa geografía poblacional venezolana entre dos censos: Un final de siglo y el comienzo de otro.\nThe Venezuelan population geography between two census: The end of a century and the beginning of the other.\nRojas Salazar, Andrés José\n\n\n\nPropuesta metodológica para estudios de dinámica de uso urbano utilizando la teledetección: Maracay, estado Aragua-Venezuela.\nMethodological proposal for urban use dynamics studies by using remote sensing: Maracay, Aragua state-Venezuela.\nMolina M., Gladys Zuleima\n\n\n\nZonificación geomorfológica utilizando el concepto de estabilidad relativa aplicado a la microcuenca Los Tapiales, río Mucujún, El Vallecito, estado Mérida - Venezuela.\nGeomorphological zoning based on the relative stability concept applied to Los Tapiales, micro watershed, Mucujún river, Vallecito, Mérida state - Venezuela.\nRamírez García, Rosa\n\n\n\nDivisión territorial del trabajo y medio técnico-científico-informacional. Verticalidades y horizontalidades de la minería metalífera Argentina.\nTerritorial division of labour and technician-scientific-informational medium. Uprightness and horizontalities of Argentinean metal mining.\nGómez Lende, Sebastian\n\n\n\nNaturaleza y medio ambiente: Una visión geográfica.\nNature and environment: A geographical perspective.\nVargas, Gloria Maria\n\n\n\n\n\n\n 3.- Notas y Documentos / Notes and Documents \n\n\nLa geografía política y la formación del estado de Israel: 50 años después.\nThe political geography and the formation of the state of Israel: 50 years later.\nPortillo, Alfredo\n\n\n\nÁreas emergentes: Una herramienta metodológica en el estudio de los paisajes.\nEmergent areas: A methodological tool for studying landscape-systems.\nPulido, Nubis Miriam; Rojas López, José Jesús; Goldstein, Isaac; Mejía, Joel Francisco; Molina M., Gladys Zuleima\n\n\n\n\n\n4.- Bibliografía Crítica / Books Review\n\n\nUgalde, Luis; España, Luis Pedro; Lacruz, Tito; Mikel de Viana; González, Lissette; Luengo, Néstor Luis; Ponce, María Gabriela: Detrás de la pobreza. Percepciones. Creencias. Apreciaciones.\nUgalde, Luis; España, Luis Pedro; Lacruz, Tito; Mikel de Viana; González, Lissette; Luengo, Néstor Luis; Ponce, María Gabriela: Behind poverty. Perceptions. Believeness. Appraisals.\nReseñado por: Pulido, Nubis Miriam\n\n\n\nÍndice Acumulado.\nAccumulated index.
Large-scale occupancy monitoring as a tool for Andean bear (Tremarctos ornatus) conservation in the northern Bolivian Andes
(Elsevier BV, 2025) Robert B. Wallace; Robert Márquez; Herminio Ticona; Ariel Reinaga; Jesús Martínez; Mauricio Peñaranda; Guido Ayala; María Viscarra; Isaac Goldstein
We estimated the occupancy of the Andean bear ( Tremarctos ornatus ) and identified factors influencing its occupancy using simple single-season models and spatial replicates across a 38,145 km 2 area in the northern Bolivian Andes, spanning elevations from 402 to 4,581 m above sea level from the Apolobamba Range to Lambate in the Cordillera Real. This region encompasses portions of two priority conservation areas for the Andean bear. Presence was determined through detection of signs such as tracks, scat, feeding sites, trails, and nests. Occupancy was assessed at two scales: the home range scale (16 km 2 cells with 12 visits in 57 cells) and the habitat use scale (1 km 2 cells with 3 visits in 226 cells). At the home range scale, occupancy probability (ψ) increased with distance from human settlements (β = 2.49), slope (β = 1.40), and elevation (β = 1.31). At the home range scale, overall occupancy for sampled cells was (ψ) was 0.60 (SE = 0.08) with detectability (p) of 0.39 (SE = 0.04). Model-averaged predictions estimated ψ as 0.69 (SE = 0.09) in the study area and 0.66 (SE = 0.12) when extrapolated to the broader Tropical Andes of central and northern Bolivia and southern Peru. Predicted occupancy was higher within priority Andean Bear Conservation Units (ψ = 0.77, SE = 0.08) and protected areas (ψ = 0.80, SE = 0.08) compared to areas outside these units (ψ = 0.54, SE = 0.18) and protected areas (ψ = 0.59, SE = 0.16). At the use scale, habitat use decreased near secondary roads (β = 2.33) and areas with human presence (β = −1.19) but increased near protected areas (β = −0.49). These findings highlight a significant positive relationship between Andean bear presence and protected areas while indicating negative impacts of human activity. The sign-based occupancy approach proved effective and cost-efficient for landscape-scale monitoring, providing valuable insights for conservation decision-making.