Browsing by Autor "Josef Rechberger"

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Características de la avifauna en un gradiente altitudinal de un bosque nublado andino en La Paz, Bolivia
(National University of San Marcos, 2007) Omar Martínez; Josef Rechberger
El presente trabajo analiza la diversidad y composición de la avifauna en tres localidades ubicadas dentro del Parque Nacional y Área Natural de Manejo Integrado de Cotapata, La Paz, Bolivia. Las tres localidades se distribuyeron en gradiente altitudinal y tres tipos de bosques húmedos andinos (ceja de monte a 3170 m, bosque nublado a 2620 m y bosque nublado secundario a 1850 m) de la zona Yungas. Se realizó un esfuerzo total de 3286 horas-red niebla, 324 horas de caminatas y 216 horas de conteos por puntos en los tres lugares de estudio. Un total de 220 especies fueron registradas, la mayoría capturadas en redes (100 spp., 45%). Veinticinco familias fueron representadas en las capturas por redes y 42 mediante los censos. Tyrannidae y Thraupidae fueron las más representativas mediante ambos métodos. Las curvas acumulativas de especies fueron similares en todos los sitios. La riqueza de especies para la ceja de monte, bosque nublado y bosque secundario a partir de las capturas y censos fueron de 44, 40, 44 especies y 69, 57, 86 especies, respectivamente. Un total de 16 especies de rango restringido fueron registradas (p.e. Odontophorus balliviani, Andigena cucullata). La diversidad para la ceja de monte fue H´= 1,41; para el bosque nublado (H´= 0,98) y el bosque nublado secundario (H´= 0,96). La diversidad beta fue 0,74 basada en datos de capturas con redes y 0,79 basada en datos de censos en las tres alturas.
Habitat differences in seed‐dispersing vertebrates indicate dispersal limitation in tropical bracken‐dominated deforested areas
(Wiley, 2024) Silvia C. Gallegos; César Mayta; Mariana Villegas; Guido Ayala; Kazuya Naoki; Josef Rechberger; V. D. Zambrana Rojas; María Viscarra; Nuria Bernal‐Hoverud; Mauricio Espejo
Abstract Shifting agriculture and anthropogenic fires are among the main causes of deforestation in the tropics. After fire and land abandonment, vast deforested areas are commonly dominated by the bracken fern Pteridium for long periods. Although forest regeneration in bracken‐dominated areas is mainly hindered by dispersal limitation, little is known about the role of seed‐disperser communities in slow forest succession. Our objective was to unravel the differences in the properties of the seed‐disperser communities between forests and bracken‐dominated areas to assess their role in dispersal limitation to foster ecological restoration. We compared species richness, diversity, abundance, and composition of seed‐dispersing birds, bats, and medium and large terrestrial mammals between both habitats in a montane forest of Bolivia. The species richness and diversity were similar for bats and higher for birds in bracken‐dominated areas than in the forest, but species composition was different between both habitats and groups. Although species composition was similar between both habitats for terrestrial mammals, the abundance was higher in the forest than in bracken‐dominated areas. Differences in species composition of seed‐dispersing birds and bats could be one of the main causes of dispersal limitation in forest regeneration in tropical bracken‐dominated areas. The few shared species between both habitats could explain the low seed rain of animal‐dispersed forest tree species in bracken‐dominated areas and the consequent hindered forest regeneration. Future studies relevant to natural forest regeneration should focus on analyzing the effects of animal‐attractants such as perches, artificial bat‐roosts, and seedling transplants on disperser communities, seed dispersal effectiveness, and forest regeneration. Abstract in Spanish is available with online material.
MAMÍFEROS MEDIANOS Y GRANDES DE LA SERRANÍA DEL AGUARAGÜE, TARIJA (BOLIVIA)
(Smithsonian Institution, 2008) Omar Martínez; Josef Rechberger; Javier Vedia-Kennedy; Thibeault Mesili
The medium and large mammals of the Serrania del Aguarague, Tarija (Bolivia). The southern slopes of the Bolivian sub-Andean are among those considered poorly known in terms of local biodiversity. Although it is known that the region harbors mammal species typical of the Chaco and transitional forests, few surveys of mammals were conducted. We present an annotated check-list of the medium and large mammals of the Serrania del Aguarague National Park and Natural Area of Integrated Management, Tarija (Bolivia). In the Serrania del Aguarague, faunal elements from the eastern Chaco forest converged with elements of western montane forest. During 18 months (2003 to 2006) we study the mammals in five localities in the central part of the park and one locality in the southern part in a gradient between 400 to 1600 m in elevation. We completed a total effort of 350 days of fieldwork, 1319 km by transects, 72 interviews, and 272 km of random walks. The species were identified by direct observation and indirect methods. We re- corded 32 species of mammals, of which Panthera onca, Tremarctos ornatus, Tapirus terrestris, and Tayassu pecari are threatened species.
The recovery of a population of the Vulnerable taruka<i>Hippocamelus antisensis</i>near La Paz, Bolivia: opportunities for conservation and education
(Cambridge University Press, 2014) Josef Rechberger; Luis F. Pacheco; Ángela M. Gaviria; Alejandra I. Roldán; Octavio Martínez; Geovanna Mendieta
Abstract The taruka Hippocamelus antisensis , a species of deer categorized as Vulnerable on the IUCN Red List, was thought to be locally extinct in the environs of La Paz, Bolivia. However, local people from Mecapaca municipality reported seeing tarukas at their former community establishment, which had been abandoned several years previously. After confirming the presence of taruka we conducted intensive surveys from which we estimated minimum abundance, and then calibrated relative abundance indices (faecal and track counts) to the abundance estimate. Using these calibrated indices we carried out a preliminary estimate of the total abundance of the species in the municipality of Mecapaca. We also carried out conservation education activities with teachers and students at local schools, which we discuss here in terms of the long-term conservation of this threatened species.