Browsing by Autor "Carlos I. Molina"

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Asociando inmaduros y adultos de insectos acuáticos utilizando códigos de barras de ADN en ríos altoandinos
(2017) Carlos I. Molina; François‐Marie Gibon; Eduardo Domı́nguez; Thomas Pape; Nina Rønsted
Associating immatures and adults of aquatic insects using DNA barcoding in high Andean streams
(2017) Carlos I. Molina; François‐Marie Gibon; Eduardo Domı́nguez; Thomas Pape; Nina Rønsted
Analizamos la viabilidad del uso de códigos de barras de ADN como una herramienta para lograr una asociación rápida y correcta entre las diferentes etapas de vida en algunos insectos de los órdenes Ephemeroptera, Plecoptera y Trichoptera, correspondiente a cursos de aguas corrientes de la región Andina de La Paz, Bolivia. Nos enfocamos en estos ambientes, debido a que el agua de los arroyos de los glaciares empieza a escasear, y esto podría crear un riesgo en la desaparición local de estas especies acuáticas. Por medio del uso de las secuencias del gen citocromo c-oxidasa subunidad 1 (COI), encontramos alta divergencia interespecífica genética entre muestras de diferentes familias y géneros (máximo 20%), mientras que las divergencias genéticas intraespecíficas fueron menores entre ejemplares de la misma especie (osciló entre 0.1-2%). De esta manera asociamos el estadio larval o de ninfa con sus respectivos adultos (hembras y machos), para una especie de efemeróptero (Meridialaris tintinnabula Pescador & Peters 1987), tres especies de plecópteros (Anacroneuria vagante Stark & Baumann 2011, Claudioperla tigrina Klapálek 1904 y C. ruhieri Gibon & Molina 2013) y una especie de tricóptero (cf. Anomalocosmoecus illiesi Marlier, 1962). Concluimos que el código de barras de ADN podría ser una herramienta eficaz para asociar etapas de la vida y esto podría acelerar el estudio de los patrones de biodiversidad de insectos acuáticos de la región altoandina.
Contaminación de la Bahía de Cohana, Lago Titicaca (Bolivia): Desafíos y oportunidades para promover su recuperación
(2017) Carlos I. Molina; Xavier Lazzaro; Stéphane Guédron; Darío Achá
Contribution to the Knowledge of the Andean Stonefly Genus Claudioperla Illies, with Description of New Apterous and Micropterous Species (Plecoptera: Gripopterygidae)
(Springer Nature, 2013) François‐Marie Gibon; Carlos I. Molina
Estimating species diversity and distribution in the era of <scp>B</scp>ig <scp>D</scp>ata: to what extent can we trust public databases?
(Wiley, 2015) Carla Maldonado; Carlos I. Molina; Alexander Zizka; Claes Persson; Charlotte M. Taylor; Joaquina Albán Castillo; Eder Chilquillo; Nina Rønsted; Alexandre Antonelli
Open databases and integrative bioinformatic tools allow a rapid approximation of large-scale patterns of biodiversity across space and altitudinal ranges. We found that geographic inaccuracy affects diversity patterns more than taxonomic uncertainties, often leading to false positives, i.e. overestimating species richness in relatively species poor regions. Public databases for species distribution are valuable and should be more explored, but under scrutiny and validation by taxonomic experts. We suggest that database managers implement easy ways of community feedback on data quality.
ESTRUCTURA DE MACROINVERTEBRADOS ACUÁTICOS EN UN RÍO ALTOANDINO DE LA CORDILLERA REAL, BOLIVIA: VARIACIÓN ANUAL Y LONGITUDINAL EN RELACIÓN A FACTORES AMBIENTALES
(2008) Carlos I. Molina; François‐Marie Gibon; Julio Pinto; Claudio Rosales
Este trabajo describe la estructura de la comunidad de macroinvertebrados acuáticos en un río altoandino de la cuenca amazónica boliviana. Se describe la variación anual y longitudinal en relación a factores ambientales. Este río libre de influencias antropogénicas, presenta una baja heterogeneidad longitudinal pero importantes variaciones de flujo. Además, como muchos ríos altoandinos, está alimentado y consecuentemente regulado por un glacial (Mururata). Este fenómeno decrece y está amenazado por la desaparición de los glaciales tropicales a causa del calentamiento global. Los efectos de la fauna podrían ser drásticos. Nuestros resultados muestran una baja riqueza de taxa de macroinvertebrados que sin embargo son abundantes, especialmente aquellas poblaciones que son permanentes: Baetidae (Andesiops peruvianus), Leptophlebiidae (Meridialaris tintinnabula), Gripopterygidae (Claudioperla tigrina), Simuliidae, Chironomidae y Oligochaeta. Mediante herramientas estadísticas de análisis multivariado, demostramos que la densidad y la riqueza de las poblaciones de macroinvertebrados están influenciadas por las variaciones de descarga hidráulica.
Life cycles of dominant mayflies (Ephemeroptera) on a torrent of the high Bolivian Andes
(Vicerractoría Investigación, 2016) Carlos I. Molina; Kenneth P. Puliafico
The mayflies of the temperate and cold zones have well-synchronized life cycles, distinct cohorts, short emergence and flight periods. In contrast, aquatic insects from the tropical zones are characterized by multivoltine life cycles, “non-discernible cohorts” and extended flight periods throughout the year. This report is the first observation of life cycle patterns made of two species of mayflies on a torrent in the high elevation Bolivian Andes. The samples were taken from four sites and four periods during a hydrological season. The life cycle of each species was examined using size-class frequency analysis and a monthly modal progression model (von Bertalanffy’s model) to infer the life cycle synchrony type. These first observations showed a moderately synchronized univoltine life cycle for Andesiops peruvianus (Ulmer, 1920), whereas Meridialaris tintinnabula Pescador and Peters (1987), had an unsynchronized multivoltine life cycle. These results showed that the generalization of all aquatic insects as unsynchronized multivoltine species in the Andean region may not be entirely accurate since there is still a need to further clarify the life cycle patterns of the wide variety of aquatic insects living in this high elevation tropical environment.
Low total mercury in Caiman yacare (Alligatoridae) as compared to carnivorous, and non-carnivorous fish consumed by Amazonian indigenous communities
(Elsevier BV, 2016) Sofía Rivera; Luis F. Pacheco; Darío Achá; Carlos I. Molina; Guido Miranda
Macroinvertebrate food web structure in a floodplain lake of the Bolivian Amazon
(Springer Science+Business Media, 2010) Carlos I. Molina; François‐Marie Gibon; Thierry Oberdorff; Eduardo Domı́nguez; Julio Pinto; Rubén Marín; Marc Roulet
Mercury contamination level and speciation inventory in Lakes Titicaca & Uru-Uru (Bolivia): Current status and future trends
(Elsevier BV, 2017) Stéphane Guédron; David Point; Darío Achá; Sylvain Bouchet; Pascale A. Baya; Emmanuel Tessier; Mathilde Monperrus; Carlos I. Molina; Alexis Groleau; Laurent Chauvaud
Proceso de biomagnificación de metales pesados en un lago hiperhalino (Poopó, Oruro, Bolivia): Posible riesgo en la salud de consumidores
(2012) Carlos I. Molina; Carla Ibañez; François‐Marie Gibon
Selection of macroinvertebrate metrics for rapid assessment of the human impact by biotic conditions of Bolivian Altiplano streams
(Elsevier BV, 2021) Carlos I. Molina; Julio Pinto; Darío Achá
The genus Oecetis McLachlan in Bolivia and northwestern Argentina (Trichoptera: Leptoceridae), with new species and identification key for males of Oecetis species from Mexico, Central and South America
(Q15088586, 2011) Paola Rueda Martín; François‐Marie Gibon; Carlos I. Molina
Six new species of Oecetis are described from Bolivia: O. carlibanezae, O. chipiriri, O. dominguezi, O. oberdorffi, O. pseudoamazonica and O. traini. Eight previously described species are recorded from Bolivia and northwestern Argentina: O. amazonica (Banks 1924), O. avara (Banks 1895), O. exisa Ulmer 1907, O. inconspicua (Walker 1852), O. knutsoni Flint 1981, O. paranensis Flint 1982a, O. punctipennis (Ulmer 1905) and O. rafaeli Flint 1991b. This work contains an identification key for males of Oecetis species from Mexico, Central and South America.
Transfer of mercury and methylmercury along macroinvertebrate food chains in a floodplain lake of the Beni River, Bolivian Amazonia
(Elsevier BV, 2010) Carlos I. Molina; François‐Marie Gibon; Jean-Louis Duprey; Eduardo Domı́nguez; Jean-Remy D. Guimarães; Marc Roulet
Trophic Structure and Mercury Biomagnification in Tropical Fish Assemblages, Iténez River, Bolivia
(Public Library of Science, 2013) Marc Pouilly; Danny Rejas; Tamara Pérez; Jean‐Louis Duprey; Carlos I. Molina; Cédric Hubas; Jean-Remy D. Guimarães
We examined mercury concentrations in three fish assemblages to estimate biomagnification rates in the Iténez main river, affected by anthropogenic activities, and two unperturbed rivers from the Iténez basin, Bolivian Amazon. Rivers presented low to moderate water mercury concentrations (from 1.25 ng L(-1) to 2.96 ng L(-1)) and natural differences in terms of sediment load. Mercury biomagnification rates were confronted to trophic structure depicted by carbon and nitrogen stable isotopes composition (δ(15)N; δ(13)C) of primary trophic sources, invertebrates and fishes. Results showed a slight fish contamination in the Iténez River compared to the unperturbed rivers, with higher mercury concentrations in piscivore species (0.15 µg g(-1) vs. 0.11 µg g(-1) in the unperturbed rivers) and a higher biomagnification rate. Trophic structure analysis showed that the higher biomagnification rate in the Iténez River could not be attributed to a longer food chain. Nevertheless, it revealed for the Iténez River a higher contribution of periphyton to the diet of the primary consumers fish species; and more negative δ(13)C values for primary trophic sources, invertebrates and fishes that could indicate a higher contribution of methanotrophic bacteria. These two factors may enhance methylation and methyl mercury transfer in the food web and thus, alternatively or complementarily to the impact of the anthropogenic activities, may explain mercury differences observed in fishes from the Iténez River in comparison to the two other rivers.