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• W2486519480 abstract "espanolLas cuencas que drenan la costa oriental del Lago de Maracaibo en Venezuela se encuentran bajo fuertes impactos con efecto pernicioso sobre los ecosistemas fluviales, pero se desconoce su estado de conservacion, lo que limita el manejo adecuado de los recursos hidrobiologicos regionales. En los tributarios Machango y Misoa se caracterizaron 16 tramos de rios segun las dimensiones del cauce, la composicion del sustrato y las variables fisico-quimicas del agua, y se recolectaron muestras de insectos. El estado de conservacion de las localidades se estimo mediante indices ambientales (IHF: indice de habitat fluvial; QBR-And: indice de calidad de bosques de ribera andina; HII: indice de integridad de habitat). Se exploraron las relaciones entre el gradiente del habitat e indices mediante analisis de clasificacion y ordenacion multivariada. El habitat acuatico mostro un gradiente de heterogeneidad asociado directa y significativamente con la altura y el estado de conservacion de cauces y zonas de ribera. Todos los indices tuvieron puntajes elevados donde hubo mayor cobertura vegetal en zonas de ribera y sustratos mas heterogeneos; ademas, los indices tuvieron correlaciones proporcionales y significativas con el gradiente del habitat fluvial y el numero de familias de insectos acuaticos. Se reconocio un gradiente en el estado de conservacion, donde una clase de conservacion baja se asocio con habitats homogeneos e intervenidos y con menor riqueza de insectos acuaticos. Los indices empleados son adecuados para estimar las clases de conservacion de los rios y sus biotas, pudiendo ser utiles para el monitoreo de las cuencas hidrograficas. EnglishThe drainages of the eastern coast of Lake Maracaibo of Venezuela are subjected to strong disturbances, especially the loss of riparian forests and transformation of riverbeds, with detrimental effect on river ecosystems, but their conservation status is unknown, limiting appropriate management of regional hydrobiological resources. In the tributary rivers Machango and Misoa, 16 drainage sites were evaluated by characterizing the channel dimensions, the substrate composition and the water physicochemical variables. Aquatic insects were also collected using standardized sampling. The conservation status of the sites was estimated using environmental indices (IHF: fluvial habitat index; QBR-And: index of quality of Andean riparian forest; HII: habitat integrity index). Relationships between habitat gradient and the indices were explored by multivariate classification and ordination analysis. The synthetic variables generated were related environmental indices and biotas. The aquatic habitat showed a heterogeneity gradient directly and significantly associated with the variables that determine the structure of the channel and riparian zones. All indices scored higher where there was more vegetation cover in riparian zones and heterogeneous substrates; also, the indices had significant correlations with the gradient of fluvial habitat and number of insect families. A gradient in the conservation status was detected, where a class of low conservation was associated with homogeneous and impacted habitats and the lowest richness of insect families. The indices used are suitable to estimate conservation classes of rivers and their biotas, and may be employed for monitoring drainages. portuguesAs bacias que drenam a costa oriental do Lago de Maracaibo na Venezuela se encontram sob fortes impactos com efeito pernicioso sobre os ecossistemas fluviais, mas se desconhece seu estado de conservacao, o que limita a manipulacao adequada dos recursos hidro biologicos regionais. Nos tributarios Machango e Misoa foram caracterizados 16 segmentos de rio segundo as dimensoes do leito, a composicao do substrato e as variaveis fisico-quimicas da agua, e se recolheram amostras de insetos. O estado de conservacao das localidades foi estimado mediante indices ambientais (IHF: indice de habitat fluvial; QBR-And: indice de qualidade de florestas de ribeira andina; HII: indice de integridade de habitat). Exploraram-se as relacoes entre a gradiente do habitat e indices mediante analises de classificacao e ordenacao multivariada. O habitat aquatico mostrou uma gradiente de heterogeneidade associada direta e significativamente com a altura e o estado de conservacao de leitos e areas de ribeira. Todos os indices tiveram pontuacoes elevadas onde houve maior cobertura vegetal em areas de ribeira e substratos mais heterogeneos; alem disso, os indices tiveram correlacoes proporcionais e significativas com a gradiente do habitat fluvial e o numero de familias de insetos aquaticos. Reconheceu-se uma gradiente no estado de conservacao, onde uma classe de conservacao baixa foi relacionada com habitats homogeneos e modificados, e com menor riqueza de insetos aquaticos. Os indices empregados sao adequados para estimar as classes de conservacao dos rios e suas biotas, podendo ser uteis para o monitoramento das bacias hidrograficas" @default.
• W2486519480 created "2016-08-23" @default.
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• W2486519480 date "2016-01-01" @default.
• W2486519480 modified "2023-09-23" @default.
• W2486519480 title "INTEGRACIÓN DE ESCALAS, GRADIENTES AMBIENTALES E ÍNDICES EN LA EVALUACIÓN DEL ESTADO DE CONSERVACIÓN DE LOS RÍOS EN LA COSTA ORIENTAL DEL LAGO DE MARACAIBO, VENEZUELA" @default.
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