Riffles
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Distribution and habitat preference of Ephemeroptera and Trichoptera in subtropical mountain streams: implications for monitoring and conservation
Abstract: The assessment of biotic-habitat relationships provides key information to predict biotic responses to perturbations and important tools for river management and monitoring. This study aimed to assess the spatial distribution of Ephemeroptera and Trichoptera in mountain streams of central Argentina. We evaluated the effect of seasonality and identi
An. Acad. Bras. Ciênc.. Publicado em: 14/10/2019
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2. Fish habitat associations along a longitudinal gradient in a preserved coastal Atlantic stream, Brazil
ABSTRACT Habitat conditions at multiple scales are one of the major factors structuring ichthyofauna. Thus, we analyzed the fish habitat associations along the headwater-mouth gradient of a coastal Atlantic stream. We categorized the sampling sites into habitat units, so that in the middle reach these categories were statistically differentiated into riffles
Zoologia (Curitiba). Publicado em: 01/02/2018
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3. Environmental constraints structuring fish assemblages in riffles: evidences from a tropical stream
RESUMO Corredeiras são habitats singulares no que se refere à estrutura das suas assembleias. Entretanto, a compreensão sobre como essas assembleias respondem às variações ambientais em pequenas extensões espaciais, como dentro de um riacho, ainda é um desafio. Avaliamos se a estrutura quantitativa das assembleias de peixes, assim como a sua composi�
Neotrop. ichthyol.. Publicado em: 15/09/2016
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4. Variación espacio-temporal de Chironomidae (Diptera) bentónicos y derivantes en un arroyo serrano en Córdoba, Argentina
Chironomidae is one of the most abundant and diverse families in freshwater ecosystems, however its highly complex systematic has led to its scarce development in many limnological studies. The aim of this study was to analyze benthic and drifting Chironomidae assemblages in a mountain stream of central Argentina assessing abundance, diversity and taxa compo
Iheringia, Sér. Zool.. Publicado em: 2015-03
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5. Occurrence of Hirudinea species in a post urban reach of a Patagonian mountain stream
Temporal (May 2005 to February 2006) and habitat distribution (pools and riffles) of Hirudinea species was analyzed at a post urban reach from Esquel stream (Chubut province, Patagonia, Argentina). Site was located 5.7 km downstream a Waste Treatment Plant. Mean values of nutrients: ammonia, nitrates and soluble reactive phosphate, as well water conductivity
Iheringia, Sér. Zool.. Publicado em: 2014-09
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6. Estructura de la comunidad de macroinvertebrados del arroyo Achiras (Córdoba, Argentina): análisis previo a la construcción de una presa
Regulation of rivers and streams modifies parameters that directly influence on the biota. In Achiras-del Gato endorheic basin has completed the construction of a midsize dam that will alter the limnological characteristics of the system and the structure of benthic communities. This study provides the first taxonomic records of macrobenthos of this lotic sy
Iheringia. Série Zoologia. Publicado em: 2012-06
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7. Ecological distribution of stream macroalgae in different spatial scales using taxonomic and morphological groups
We examined the ecological distribution of macroalgal communities in streams using species groups (taxonomic units = algal phyla, and morphological = morphological types) with similar structures and functions instead of the species themselves. The study was conducted from June to July/2007 in two drainage basins located in mid-southern region of Paraná Stat
Braz. J. Bot.. Publicado em: 2012
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8. Spatial variations at different observational scales and the seasonal distributions of stream macroalgae in a Brazilian subtropical region
We examined the relationships between environmental variations in lotic ecosystems with the seasonal dynamics of macroalgae communities at different spatial scales: drainage basin of two rivers (Rio das Pedras and Rio Marrecas), shading (open and shaded stream segments), mesohabitat (riffles and pools), and microhabitats. Data collections were made on a mont
Braz. J. Bot.. Publicado em: 2012
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9. A diversidade beta de comunidades de macroinvertebrados é menor em córregos degradados? Uma avaliação experimental
Com o objetivo de responder a pergunta: Córregos preservados podem sustentar uma maior diversidade beta que córregos degradados? Estimamos a diversidade beta de córregos preservados e degradados durante a estação chuvosa de 2009 em áreas de remanso e corredeira utilizando como substrato sacos de detritos foliares da espécie arbórea Talauma ovata. Ana
Publicado em: 2011
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10. Distribution patterns and trophic characteristics of salmonids and native species inhabiting high altitude rivers of Pampa de Achala region, Argentina
The Pampa de Achala in central Argentina is an area with low fish species richness where salmonids were first introduced at the beginning of the twentieth century. A total of 19 rivers of different order were sampled during the low water period by using portable electrofishing equipment. We covered different identified macrohabitats (pools, riffles, glides a
Neotropical Ichthyology. Publicado em: 2010
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11. A complexidade do substrato e o mesohabitat (remanso e corredeira) são farores que influenciam a fauna de Chironomidae (Diptera) em riachos do Brasil Central? / Are the substrate complexity and the mesohabitat (pools and riffles) factors that influence the fauna of Chironomidae (Diptera) in streams of Central Brazil?
The present study had the aim to test the effects of the substrate complexity and of the mesohabitat (pools and riffles) on the richness, abundance and composition of Chironomidae (Diptera) in streams. The experiment took place in 12 streams of Central Brazil. In each stream, two plastic trays were put in each one of the two studied mesohabitats (pool and ri
Publicado em: 2009
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12. DETERMINAÇÃO DA ESTRUTURA DAS COMUNIDADES DE MACROINVERTEBRADOS BENTÔNICOS NA SUBBACIA DO RIBEIRÃO SÃO JOÃO TO
This study was carried out in the sub-basin of the São João stream, Palmas TO, bearing as objective: 1) to describe the ecological characteristics (density, abundance, richness, Shannon-Wiener diversity, and evenness) of the assembly of aquatic insects; 2) to verify if there is exist similarity between the sampled assemblies; 3) to indicate which ones amon
Publicado em: 2008