Browsing by Autor "Nabor Moya"

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COMPARACIÓN DE LAS COMUNIDADES DE MACROINVERTEBRADOS ACUÁTICOS EN RÍOS INTERMITENTES Y PERMANENTES DEL ALTIPLANO BOLIVIANO: IMPLICACIONES PARA EL FUTURO CAMBIO CLIMÁTICO
(2009) Nabor Moya; François‐Marie Gibon; Thierry Oberdorff; Claudio Rosales; Eduardo Domínguez
El impacto de la estacionalidad de los ríos sobre las comunidades de macroinvertebrados fue estudiado en ríos de la zona Altoandina de Bolivia, durante la época de transición y época seca del año 2008. En nueve arroyos intermitentes y nueve permanentes se colectaron muestras de macroinvertebrados y parámetros ambientales. A traves de análisis multivariados, se determinaron relaciones entre variables biológicas (según riqueza, abundancia, composición trófica y rasgos biológicos) con las variables ambientales. La estacionalidad no tuvo efecto significativo sobre la riqueza ni densidad de macroinvertebrados, tampoco se encontraron efectos notorios sobre la composición trófica ni los rasgos biológicos (tipo de respiración), pero sí encontramos diferencias significativas en la composición taxonómica, especialmente en la proporción de Ephemeroptera, Plecoptera y Trichoptera (EPT); asimismo, encontramos que existen otras variables ambientales como la profundidad, solidos disueltos y pH que tienen mayor efecto que la intermitencia en la riqueza y densidad total. De acuerdo a datos climáticos de la región Andina de Bolivia se sabe que en el futuro habrá una disminución del agua, incluso la desecación temporal en varios ríos de la zona, esto debido a la disminución de los glaciares. De esta manera, el futuro cambio climático reflejado a través de la estacionalidad de los ríos, tendrá mayor efecto en los cambios de la estructura taxonómica que en la estructura funcional, lo que indica que probablemente tendrá implicaciones más fuertes en la conservación de taxa que en la composición de los rasgos de la comunidad de macroinvertebrados.
Comparison of aquatic macroinvertebrate communities from intermittent and perennial bolivian headwater andean streams: implications for future climate change
(2009) Nabor Moya; François‐Marie Gibon; Thierry Oberdorff; Claudio Rosales; Eduardo Domı́nguez
Context‐dependent resistance of freshwater invertebrate communities to drying
(Wiley, 2017) Thibault Datry; Ross Vander Vorste; Edgar Goïtia; Nabor Moya; Melina Campero; Fabiola Rodríguez; José Zubieta; Thierry Oberdorff
Abstract More freshwater ecosystems are drying in response to global change thereby posing serious threat to freshwater biota and functions. The production of desiccation‐resistant forms is an important adaptation that helps maintain biodiversity in temporary freshwaters by buffering communities from drying, but its potential to mitigate the negative effects of drying in freshwater ecosystems could vary greatly across regions and ecosystem types. We explored this context dependency by quantifying the potential contribution of desiccation‐resistance forms to invertebrate community recovery across levels of regional drying prevalence (defined as the occurrence of drying events in freshwaters in a given region) and ecosystem types (lentic, lotic) in temporary neotropical freshwaters. We first predicted that regional drying prevalence influences the selection of species with desiccation‐resistant forms from the regional species pools and thus increases the ability of communities to recover from drying. Second, we predicted lentic freshwaters harbor higher proportions of species with desiccation‐resistant forms compared to lotic, in response to contrasted hydrologic connectivity. To test these predictions, we used natural experiments to quantify the contribution of desiccation‐resistant forms to benthic invertebrate community recovery in nine intermittent streams and six geographically isolated temporary wetlands from three Bolivian regions differing in drying prevalence. The contribution of desiccation‐resistant forms to community recovery was highest where regional drying prevalence was high, suggesting the species pool was adapted to regional disturbance regimes. The contribution of desiccation‐resistant forms to community recovery was lower in streams than in wetlands, emphasizing the importance of hydrologic connectivity and associated recolonization processes from in‐stream refuges to recovery in lotic systems. In all regions, the majority of functional traits were present in desiccation‐resistant taxa indicating this adaptation may help maintain ecosystem functions by buffering communities from the loss of functional traits. Accounting for regional context and hydrologic connectivity in community recovery processes following drying can help refine predictions of freshwater biodiversity response to global change.
Desarrollo de un índice multimétrico basado en macroinvertebrados acuáticos para evaluar la integridad biológica en ríos de los valles interandinos de Bolivia
(LA Referencia, 2011) Nabor Moya; Eduardo Domı́nguez; Edgar Goïtia; Thierry Oberdorff
Se presenta un índice multimétrico que permite discriminar la variabilidad ambiental natural de la antropogénica en 91 sitios (63 sitios de referencia y 28 sitios perturbados) distribuidos de manera uniforme a lo largo de la cuenca alta del Río Grande (Bolivia). En este procedimiento se utilizaron inicialmente 12 métricas que reflejan distintos atributos de la estructura y el funcionamiento de la comunidad de macroinvertebrados acuáticos, por su potencial como indicadoras de alteración de ambientes acuáticos. En principio, usando los sitios de referencia, se desarrollaron modelos estadísticos que describen la respuesta de las distintas métricas a la variabilidad ambiental natural. Luego se utilizaron estos modelos para predecir la respuesta de las métricas en condiciones alteradas, para lo cual se usaron los sitios que presentaban distintos tipos de perturbación antropogénica (i.e., perturbación por actividad agrícola, urbana y minera). De las 12 métricas iniciales se conservaron sólo cinco para elaborar el índice final (riqueza total, abundancia total, riqueza de Ephemeroptera, Plecoptera y Trichoptera (EPT), porcentaje en abundancia de EPT y porcentaje en abundancia de raspadores). Estas métricas resultaron las más efectivas al responder de manera significativa al gradiente de perturbación. Este índice distinguió con claridad los sitios de referencia de los perturbados, y mostró una relación lineal negativa significativa frente a un gradiente de perturbaciones físicas y químicas. Esta aproximación puede servir como herramienta de biomonitoreo para evaluar la integridad biótica y la biodiversidad acuática en los ríos de la región de los valles interandinos de Bolivia.
Description of the first South American species of<i>Neocylloepus</i>Brown (Coleoptera: Elmidae):<i>N. chaparensis</i>sp. nov. from Bolivia
(Taylor & Francis, 2010) Verónica Manzo; Nabor Moya
A new species of riffle beetle from Bolivia, Neocylloepus chaparensis sp. nov., is described and illustrated from adults of both sexes and the larva. This is the first species of Neocylloepus Brown described from South America. The new species is compared with other species described in the genus. Distributional records, diagnoses and a key to distinguish the species of genus are included. Se describe una nueva especie de élmido de Bolivia, Neocylloepus chaparensis sp. nov. Se describe e ilustra los adultos de ambos sexos y la larva. Esta es la primera especie del género descripta para América del Sur. La nueva especie es comparada con todas las otras especies conocidas de Neocylloepus. Se incluyen nuevos datos de distribución, diagnósis y claves para identificar adultos y larvas del género. © 2010 Taylor & Francis.
Determinants of local and regional communities in intermittent and perennial headwaters of the Bolivian Amazon
(Centre National de la Recherche Scientifique, 2016) Thibault Datry; Nabor Moya; J. Zubieta; Emili García‐Berthou
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Determinants of local and regional communities in intermittent and perennial headwaters of the Bolivian Amazon
(Wiley, 2016) Thibault Datry; Nabor Moya; José Zubieta; Thierry Oberdorff
Summary The effect of drying events on aquatic biodiversity is still overlooked in wet Neotropical systems. Yet, the responses of local communities and metacommunities in these biodiversity hotspots may differ from what is reported in other areas. We addressed the effect of drying events on local and regional fish and macroinvertebrate communities in the headwaters of the Chipiriri River basin, in the wet Neotropical piedmont of Bolivia. According to current knowledge in intermittent rivers and ephemeral streams (IRES) ecology, we predicted that intermittent (INT) sites would harbour lower α‐diversity, but higher β‐diversity, than perennial (PER) sites, due to local, negative effect of drying combined with the existence of multiple recovery stages at the network scale. Although habitat variables were similar between INT and PER sites, local and regional diversity patterns differed. Local invertebrate communities were not different between site types as soon as 4–6 weeks after flow resumption. The proximity of colonist sources and frequent rainfall probably enhanced persistence through dry periods and high resilience. In contrast, fish communities were still poorer at INT than PER sites, indicating they were still in the process of recolonising upstream INT reaches. β‐diversity analyses confirmed that invertebrate and fish metacommunities were not at the same recovery stage because (i) β‐diversity of invertebrates was best explained by physical and environmental distances at both INT and PER sites, whereas that of fish was explained only by physical distances at INT sites; (ii) fish β‐diversity was higher at INT than at PER sites, but invertebrate β‐diversity was similar; and (iii) physical distances were correlated with the turnover component of invertebrate β‐diversity but with the nestedness component for fish. Exploring regional community patterns in IRES and across biota with different dispersal abilities and modes can advance metacommunity theory and improve our ability to predict local community composition in dynamic ecosystems.
Drying has limited effects on the composition of invertebrate communities across a river network of the arid Bolivian Andes
(European Organization for Nuclear Research, 2025) Nabor Moya; Mathis Messager; Beymar Fernandez Rodriquez; Florentino Saigua; Ariel Angel Cespedes Llave; N. Bonada; Thibault Datry
This dataset consists of an Excel file with two sheets. The first sheet contains environmental data and invertebrate abundance data, while the second sheet provides explanations for each column. Specifically, the environmental variables recorded in the first sheet are described in the second sheet. ‘N/A’ (not applicable) indicates missing information in environmental variables or metadata, which may vary depending on whether the data were not collected or were lost.
Ecological quality evaluation of the Quirpinchaca and Cachimayu rivers using macroinvertebrates as contamination bioindicators
(2019) Nabor Moya; Mayra Santander; Beymar Fernández
Evaluación de la calidad ecológica de los ríos Quirpinchaca y Cachimayu usando macroinvertebrados como bioindicadores de contaminación
(2019) Nabor Moya
Los ríos son grandes centros de biodiversidad, pero también los más amenazados por distintas actividades antropogénicas. El caso particular del río Quirpinchaca que atraviesa por el centro de la ciudad de Sucre ha sufrido visiblemente serios daños y hasta ahora no existen estudios con base ecológica y técnica que permita evaluar y restaurarlo. Por ello este trabajo pretende evaluar la calidad ecológica del río Quirpinchaca (siete sitios) y Cachimayu (tres sitios) usando a los macroinvertebrados acuáticos como potenciales bioindicadores de contaminación apoyados con datos fisicoquímicos. Los índices bióticos usados fueron el BMWP/Bol, abundancia relativa de grupos sensibles (Ephemeroptera Plecoptera y Trichoptera) y de grupos tolerantes (Diptera). Como resultados relevantes, los tres índices bióticos indican que el río Quirpinchaca presenta calidad “muy crítica” desde las nacientes hasta la desembocadura al río Chaquimayu, mientras que este último río presenta calidades que varían desde calidad “buena” hasta calidad “muy crítica”. Los parámetros fisicoquímicos que mejor respondieron a la contaminación fueron el oxígeno disuelto y la demanda química de oxígeno, cuyos valores indican que el río Quirpinchaca presenta mayor grado de contaminación en el centro de la ciudad que en zonas menos pobladas como las nacientes del río y la confluencia con el río Cachimayu. Por otro lado, el río Cachimayu presenta mejores condiciones fisicoquímicas que el río Quirpinchaca. Consideramos que estos resultados podrían servir como una herramienta útil, sencilla y económica para monitorear espacial y temporalmente a cada uno de estos sitios estudiados y en futuros planes de gestión y restauración principalmente del río Quirpinchaca, cuya meta debería incluir la recuperación en riqueza y abundancia de taxones sensibles como los tiene el río Cachimayu.
Indice multimétrico de integridad biótica béntica para la cuenca del Río Chipiriri, Cochabamba - Bolivia
(2006) Nabor Moya; Thierry Oberdorff
MULTIMETRIC INDEX OF BIOTIC INTEGRITY BASED ON MACROINVERTEBRATES TO ASSESS BIOTIC CONDITION OF STREAMS IN THE CHIPIRIRI BASIN, COCHABAMBA - BOLIVIA Con el proposito de desarrollar un indice multimetrico para evaluar la calidad biologica de los rios de la Cuenca Chipiriri (Bolivia), tomamos muestras de macroinvertebrados bentonicos y medidas ambientales en dos grupos de sitios distribuidos uniformemente en toda la cuenca, 38 sitios con minima perturbacion antropogenica y 29 sitios perturbados. Usando los datos del primer grupo de sitios, desarrollamos modelos estadisticos sencillos de modo que expliquen adecuadamente los patrones observados de 12 diferentes variables biologicas tomadas en cuenta; posteriormente, seleccionamos las variables biologicas mas efectivas que respondieron de forma significativa a efectos de perturbacion. Finalmente, sumando los valores de las variables biologicas seleccionadas obtuvimos el indice final que distinguio claramente la variacion de la calidad biologica de las condiciones naturales y perturbadas. Los metodos y consideraciones descritas en este trabajo, podrian emplearse para desarrollar un indice de integridad ecologica en otras regiones, incluyendo nuevos parametros a esta escala. Palabras claves: Evaluacion biologica, macroinvertebrados, rios tropicales, perturbacion antropogenica, Chapare, Bolivia. ABSTRACT In order to develop a multimetric biotic integrity index, we collected data on the macroinvertebrate communities and local environmental habitat descriptors in 38 reference and 29 disturbed sites, uniformly distribute within the Chipiriri watershed (Bolivia). Using the reference data set, stepwise multiple linear regression procedures were first applied to develop the simplest possible response model that adequately explained the observed patterns of 12 different biological variables, reflecting macroinvertebrate community structure. In a second step, we selected the most effective variables that discriminate between reference and disturbed sites. Finally, adding the values of the biological variables selected, we obtained a final index score that described biotic integrity of the reference and disturbed sites as excellent, good, fair, poor, or very poor. Our final index achieved good distinction between natural and human-induced variation in biological condition. Including additional parameters, this approach could be used in the near future to develop a nation biotic integrity index. Key words: Bioassessment, macroinvertebrates, tropical streams, anthropogenic disturbance, Chapare, Bolivia.
Initial development of a multi-metric index based on aquatic macroinvertebrates to assess streams condition in the Upper Isiboro-Sécure Basin, Bolivian Amazon
(Springer Science+Business Media, 2007) Nabor Moya; Sylvie Tomanová; Thierry Oberdorff
Local-scale species–energy relationships in fish assemblages of some forested streams of the Bolivian Amazon
(Elsevier BV, 2007) Pablo A. Tedesco; Carla Ibañez; Nabor Moya; Rémy Bigorne; Jimena Camacho; Edgar Goïtia; Bernard Hugueny; Mabel Maldonado; Mirtha Rivero; Sylvie Tomanová
Productivity (trophic energy) is one of the most important factors promoting variation in species richness. A variety of species–energy relationships have been reported, including monotonically positive, monotonically negative, or unimodal (i.e. hump-shaped). The exact form of the relationship seems to depend, among other things, on the spatial scale involved. However, the mechanisms behind these patterns are still largely unresolved, although many hypotheses have been suggested. Here we report a case of local-scale positive species–energy relationship. Using 14 local fish assemblages in tropical forested headwater streams (Bolivia), and after controlling for major local abiotic factors usually acting on assemblage richness and structure, we show that rising energy availability through leaf litter decomposition rates allows trophically specialized species to maintain viable populations and thereby to increase assemblage species richness. By deriving predictions from three popular mechanistic explanations, i.e. the ‘increased population size’, the ‘consumer pressure’, and the ‘specialization’ hypotheses, our data provide only equivocal support for the latter.
Macroinvertebrate-based multimetric predictive models for evaluating the human impact on biotic condition of Bolivian streams
(Elsevier BV, 2010) Nabor Moya; Robert M. Hughes; Eduardo Domı́nguez; François‐Marie Gibon; Edgar Goïtia; Thierry Oberdorff
Metacommunity patterns across three Neotropical catchments with varying environmental harshness
(Wiley, 2016) Thibault Datry; Adriano S. Melo; Nabor Moya; José Zubieta; Evans De La Barra; Thierry Oberdorff
Summary Most metacommunity studies indicate that dispersal processes play a minor role compared with species sorting in explaining metacommunity organisation, in particular, in stream systems. However, the role of dispersal could vary with environmental harshness, as a result of frequent resetting of community succession by disturbances and the selection of generalist species from regional species pools. The importance of dispersal may also be mitigated by species dispersal ability. In this study, we explored how species sorting and dispersal shaped invertebrate and fish metacommunities across streams in three tropical headwater catchments in Bolivia with contrasting environmental harshness, including flow regime, altitude and climate conditions. We addressed the hypothesis that the relative roles of dispersal and species sorting vary with environmental harshness: we predicted that the role of species sorting would predominate in benign conditions, whereas that of dispersal would predominate under moderate environmental harshness, and that neither dispersal nor species sorting would be relevant to explain metacommunities under high environmental harshness. We also hypothesised that the role of dispersal would decrease with increasing species dispersal ability. Although there was little or no spatial autocorrelation of environmental distances (i.e. environmental differences) across the headwater catchments, community similarity correlated more strongly with environmental than spatial distances among headwater sites that had low environmental harshness, but the opposite pattern was observed among sites with moderate environmental harshness. Under high environmental harshness, neither environmental harshness nor spatial distances between sites explained community similarity. Under moderate environmental harshness, the correlation between community similarity and spatial distances was the strongest for moderate dispersers of both invertebrates and fish. Yet, in contrast to fish, strongly dispersing invertebrate taxa were spatial structured, suggesting that they were not able to reach all sites as predicted. Our results suggest the role of dispersal might be underestimated, notably in systems prone to environmental harshness. Better proxies for dispersal, along with the use of spatial distances to account for resistance to animal movements in river systems and that account for flow magnitude and directionality, slope, riparian vegetation, wind and streambed roughness, may promote a more realistic integration of dispersal processes in basic and applied metacommunity research.
Tipología de ríos de la región del piedemonte andino en Cochabamba
(2003) Nabor Moya; Edgar Goïtia; Melicio Siles
Using macroinvertebrate biological traits for assessing biotic integrity of neotropical streams
(Wiley, 2008) Sylvie Tomanová; Nabor Moya; Thierry Oberdorff
Abstract Several recent studies have demonstrated that a functional approach (i.e. analysis of traits indicating species ecological functions) can be successfully used for river biomonitoring. To date this approach has only been applied in temperate rivers, even though it could notably contribute toward the development of an environmental assessment system in developing countries in other climatic zones. Using a multivariate approach (Fuzzy Correspondence Analysis—FCA), we analysed functional invertebrate community characteristics (described by 40 categories of seven biological traits mostly at the family level) at 66 stream sites from neotropical Bolivia with different level of anthropogenic disturbance. We were able to separate the sites on the first FCA axis ( F 1) (ANOVA test) following the predefined environmental quality classes based on the observed impact. Moreover, the F 1 axis scores were significantly related to scores obtained using an independent macroinvertebrate multi‐metric index previously developed to assess streams biotic condition in the same biogeographical region. The F 1 axis, which thus represents a gradient of anthropogenic impacts, was significantly correlated to 30 of the 40 studied trait categories. Our results (i) clearly confirm the possible use of functional traits for water quality assessment in neotropical streams, and (ii) provides support to the River Habitat Templet hypothesis since habitat disturbances produced predictable functional changes in macroinvertebrate assemblages. Finally, this study supports the potential worldwide applicability of the species‐trait approach as a biomonitoring tool for stream integrity assessment. Copyright © 2008 John Wiley & Sons, Ltd.