Browsing by Autor "Fernando Guerra"

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Description of a new species of the stag beetle genus Auxicerus Waterhouse, 1883 (Coleoptera: Scarabaeoidea: Lucanidae)
(Consortium of European Natural History Museums, 2017) Robert Perger; Paschoal Coelho Grossi; Fernando Guerra
A new species of the Andean stag beetle genus Auxicerus Waterhouse, 1883 is described from the humid Tucuman-Bolivian forest in the southern Bolivian Andes. Auxicerus magnipunctatus sp. nov. is distinguished from all congeners by the distinctly larger punctures of the mesosternum; antennomeres 2–6 subquadrate, last two joints of club wider than long; lamellae not widely separated; posterior end of ocular canthus rounded and anterior edge of canthus moderately developed into an obtuse triangle. Auxicerus magnipunctatus sp. nov. is possibly endemic to the Tucuman-Bolivian forest. Along with the presence of other endemic beetle species with tropical congeners, the discovery of A. magnipunctatus sp. nov. supports the idea that the persistence of rather tropical taxa in the subtropical realm is fostered by increased humidity at orographic rain barriers and climatic stability in the Tucuman-Bolivian forest.
First records of the jewel beetles Chrysobothris desmaresti (Laporte &amp; Gory, 1836) and Hiperantha stempelmanni Berg, 1889 (Coleoptera: Buprestidae) in Bolivia
(Pensoft Publishers, 2015) Robert Perger; Fernando Guerra
The jewel beetle species Chrysobothrisdesmaresti (Laporte & Gory, 1836) and Hiperanthastempelmanni Berg, 1889, have been recorded in Bolivia for the first time. Both species were collected on xeric Acacia trees. As indicated by their presence on Acacia and previous records, both species may be endemic to the arid intermountain valleys of the Southern Bolivian and Northern Argentinean Andes as well as the Chaco lowland forests.
Human-Induced Disturbance Alters Pollinator Communities in Tropical Mountain Forests
(Multidisciplinary Digital Publishing Institute, 2012) Stephan Kambach; Fernando Guerra; Stephan Beck; Isabell Hensen; Matthias Schleuning
Mountain forest ecosystems in the Andes are threatened by deforestation. Increasing fire frequencies lead to fire-degraded habitats that are often characterized by a persistent fern-dominated vegetation. Little is known about the consequences of these drastic changes in habitat conditions for pollinator communities. In a rapid diversity assessment, we collected individuals of two major groups of insect pollinators (bees and butterflies/moths) with pan traps and compared pollinator diversities in a spatial block design between forest interior, forest edge and adjacent fire-degraded habitats at eight sites in the Bolivian Andes. We found that bee species richness and abundance were significantly higher in fire-degraded habitats than in forest habitats, whereas species richness and abundance of butterflies/moths increased towards the forests interior. Species turnover between forest and fire-degraded habitats was very high for both pollinator groups and was reflected by an increase in the body size of bee species and a decrease in the body size of butterfly/moth species in fire-degraded habitats. We conclude that deforestation by frequent fires has profound impacts on the diversity and composition of pollinator communities. Our tentative findings suggest shifts towards bee-dominated pollinator communities in fire-degraded habitats that may have important feedbacks on the regenerating communities of insect-pollinated plant species.
Longhorn beetles (Coleoptera: Cerambycidae) of the Tucuman-Bolivian forest in the Tariquía Flora and Fauna National Reserve, southern Bolivian Andes, with notes on ecoregion endemism and conservation
(Pacific Coast Entomological Society, 2013) Robert Perger; Fernando Guerra
The results of a survey of Cerambycidae in subhumid Tucuman Bolivian forest (TBF) in the Tariquía Reserve, southern Bolivian Andes, are presented. In nine days collecting with beating sheets and a light trap, we obtained records for 93 species of Cerambycidae, including 50 species of Cerambycinae, 42 species of Lamiinae and one species of Prioninae. Ten species are reported for the first time from Bolivia. Two taxa could only be determined to genus and might represent undescribed species. Forty-six percent of the collected species also occur in southeastern Brazil, Paraguay, Argentina and Uruguay. Twenty-three percent of the collected species occur in areas including countries of tropical and subtropical South America and 11% in tropical South America. Fourteen (15%) of the collected species are possibly endemic to Tucuman Bolivian forest. Including the two taxa that may represent new species and seven species that have been reported in the literature from TBF but not collected during our study, the number of potential TBF endemics may be as high as 23. In view of the threats by human land use in Tucuman Bolivian forest, species endemic to this ecoregion warrant special attention in future conservation planning.Se presentan los resultados del estudio de Cerambycidae en el Bosque subtropical Tucumano-Boliviano en la Reserva de Tariquía, en los Andes del Sur de Bolivia. En nueve días de captura con trampas de golpeo y de luz, obtuvimos registros de 50 especies de Cerambycinae, 42 especies de Lamiinae y una especie de Prioninae; resultando en total 93 especies de Cerambycidae. 10 especies están reportadas por primera vez para Bolivia. Dos taxa pudieron ser identificadas sólo hasta el nivel de género y podrían representar a especies aún no descritas. El 46% de las especies capturadas también se encuentran presentes en uno o más de los siguientes países: Sud Este del Brasil, Paraguay, Argentina y Uruguay. El 23% de las especies capturadas fueron reportadas en muchos países en los trópicos y subtrópicos de Sud América y el 11% sólo en los trópicos suramericanos. Posiblemente 14 especies (15%) de los especímenes capturados son endémicas del Bosque Tucumano Boliviano. Incluyendo los dos taxa que podrían representar nuevas especies y siete especies que fueron reportadas en literatura, pero no fueron capturadas durante nuestro estudio, el número de endémicos posibles del Bosque Tucumano Boliviano llegan a 23 especies. Se requiere particular atención en planes de conservación adicionales, considerando las amenazas por el uso del suelo en el Bosque Tucumano Boliviano y el endemismo específico en la región.
The description of a new calyptrate fly mimicking species of the fungus weevil genus Gymnognathus Schönherr 1826 from the southern Bolivian Andes (Coleoptera: Anthribidae: Anthribinae)
(Q15088586, 2016) Robert Perger; Fernando Guerra
A new calyptrate fly mimicking species of Gymnognathus Schönherr 1826 from the humid Tucuman-Bolivian forest in the southern Bolivian Andes is described. Gymnognathus barclayi sp. nov. is distinguished from the closest related species G. bohlsi Jordan, 1895, by the color and/or distribution of the scales on the pronotum, fourth ventrite and pygidium, the wider pronotum and the development of the spines on the pygidium. The arrangement of the longitudinal stripes on the pronotum suggests that G. barclayi sp. nov. is a mimic of tachinid or muscid flies. The almost exclusive occurrence of Gymnognathus species in tropical moist forests indicates that the presence of G. barclayi sp. nov. in the subtropical realm is fostered by increased humidity at orographic rain barriers. G. barclayi sp. nov. is possibly endemic to the Tucuman-Bolivian forest. Along with the presence of other endemic species, the discovery of G. barclayi sp. nov. highlights the importance of the Tucuman-Bolivian forest as an endemism hotspot for insects and calls for a re-assessment of the conservation status of this spatially restricted and threatened ecoregion.
The first longhorned beetle record for the Prepuna in the Bolivian Andes and Potosi Department in Bolivia: a new species of Dirocoremia (Coleoptera: Cerambycidae: Rhopalophorini)
(Q15088586, 2015) Robert Perger; Fernando Guerra
Compared to other Bolivian ecoregions, the Prepuna and Puna in the Bolivian highlands are distinguished by low precipitation and low biological diversity. These factors have likely contributed to the perception that the Prepuna and Puna are less interesting for entomological studies, and reports of longhorned beetles from these regions remain scarce. Here, the first longhorned beetle record for the Bolivian Prepuna and Potosi Department is reported, an unknown species of Dirocoremia Marques, 1994. Dirocoremia tupizai sp. n. can be distinguished from congeners by its dark-brown to black metatibiae with short and sparse subapical brushes of hairs.
Two new tiger beetle (Coleoptera, Carabidae, Cicindelitae) species from the Tucuman-Bolivian forest in the National Tariquia Reserve, Bolivia
(Q15088586, 2012) Robert Perger; Fernando Guerra
Two new tiger beetle species from subhumid Tucuman-Bolivian forest in the National Tariquia Reserve in Tarija, Bolivia, are described and illustrated. Cylindera (Plectographa) yaguaree n. sp. is the first described Neotropical species in this genus that has setae over the complete elytral surface. Pseudoxycheila tucumana n. sp. closely resembles Pseudoxycheila andina Cassola, but is readily distinguished by spots on elytra longer than elytra width. These two new species are likely endemic to Tucuman-Bolivian forest and bring the known endemic forest tiger beetle fauna of this ecoregion to three species.