Lotic
Mostrando 13-24 de 83 artigos, teses e dissertações.
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13. Long-wavelength sensitive opsin (LWS) gene variability in Neotropical cichlids (Teleostei: Cichlidae)
ABSTRACT Cichlid fishes are an important group in evolutionary biology due to their fast speciation. This group depends widely of vision for feeding and reproduction. During the evolutionary process it plays a significant role in interspecific and intraspecific recognition and in its ecology. The molecular basis of vision is formed by the interaction of the
An. Acad. Bras. Ciênc.. Publicado em: 2017-03
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14. New records of Cosmarium Corda ex Ralfs in lotic environment, adjacent to the Iguaçu National Park, Paraná State, Brazil
RESUMO Este estudo objetivou documentar os táxons do gênero Cosmarium (Desmiadiales, Zygnematophyceae) em um riacho subtropical localizado em área adjacente ao Parque Nacional do Iguaçu, importante área de proteção ambiental no extremo oeste do Estado do Paraná. Para isso, foram realizadas amostragens mensais de material perifítico associado a Eleoc
Hoehnea. Publicado em: 2016-12
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15. Comparative metagenome of a stream impacted by the urbanization phenomenon
Abstract Rivers and streams are important reservoirs of freshwater for human consumption. These ecosystems are threatened by increasing urbanization, because raw sewage discharged into them alters their nutrient content and may affect the composition of their microbial community. In the present study, we investigate the taxonomic and functional profile of th
Braz. J. Microbiol.. Publicado em: 2016-12
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16. Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil
This paper reports the alpha and beta diversity of phytoplankton communities of two streams differing in land use. We analyzed which environmental conditions affect diversity of the phytoplankton communities and tested the hypothesis that stream stretches protected by forests will have lower species richness, whereas higher beta-diversity would occur among t
Acta Bot. Bras.. Publicado em: 2015-12
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17. Larvae of migratory fish (Teleostei: Ostariophysi) in the lotic remnant of the Paraná River in Brazil
ABSTRACT Fish larvae and adults are morphologically distinct from each other and have different ecological requirements. Research on the dynamics of ichthyoplankton provides valuable information about the early stages of the life cycle of fish. This study analyzed the temporal and spatial distribution of the larval stages of three migratory species - Salminu
Zoologia (Curitiba). Publicado em: 2015-08
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18. 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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19. Gram-negative intestinal indigenous microbiota from two Siluriform fishes in a tropical reservoir
The Gram-negative intestinal microbiota of Hypostomus auroguttatus and Pimelodus maculatus, a detritivorous and an omnivorous fish species, respectively, were compared between fishes from the reservoir and the stretch of the river below the dam of the Funil hydroelectric plant, Rio de Janeiro, Brazil. Four selective culture media were used under aerobic and
Braz. J. Microbiol.. Publicado em: 2014-12
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20. Estimating cyclopoid copepod species richness and geographical distribution (Crustacea) across a large hydrographical basin: comparing between samples from water column (plankton) and macrophyte stands
Species richness and geographical distribution of Cyclopoida freshwater copepods were analyzed along the "La Plata" River basin. Ninety-six samples were taken from 24 sampling sites, twelve sites for zooplankton in open waters and twelve sites for zooplankton within macrophyte stands, including reservoirs and lotic stretches. There were, on average, three sp
Zoologia (Curitiba). Publicado em: 2014-06
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21. Coscinodiscophyceae and Fragilariophyceae (Diatomeae) in the Iguaçu River, Paraná, Brazil
A taxonomic survey was carried out on Coscinodiscophyceae and Fragilariophyceae found in the Iguaçu River catchment area within Iguaçu National Park, in the state of Paraná, Brazil. Between September 2007 and August 2008, we collected 24 samples from two stations on the Iguaçu River, upstream and downstream of the falls. We identified 37 taxa, including
Acta Bot. Bras.. Publicado em: 2014-03
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22. Desmids (Desmidiaceae, Zygnematophyceae) with cylindrical morphologies in the coastal plains of northern Bahia, Brazil
Our knowledge of desmids with cylindrical morphologies in the state of Bahia, Brazil, is quite limited, only 13 such taxa having been described to date. The present study reports the results of a taxonomic inventory of desmids (Desmidiaceae) with cylindrical morphologies from the coastal plains of northern Bahia. During the summer months (January-March) and
Acta Bot. Bras.. Publicado em: 2014-03
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23. First records of Zygnematales (Zygnematophyceae, Streptophyta) for the state of Bahia, Brazil
This study presents the first taxonomic inventory of the order Zygnematales in the Litoral Norte Environmentally Protected Area, in the state of Bahia, Brazil. Fifty samples of planktonic and periphytic material were collected, from lotic and lentic environments, during the summer (January-March) and winter (June-August) of 2009. We identified 18 taxa distri
Acta Bot. Bras.. Publicado em: 2013-12
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24. Effects of anthropogenic impacts on benthic macroinvertebrates assemblages in subtropical mountain streams
The nature of the riparian and surrounding landscape has been modified by anthropogenic activities, which may subsequently alter the composition and functional structure of macroinvertebrate assemblages. The effect of these changes on function of benthic fauna is difficult to assess due to the scarce knowledge on functional structures in tropical streams. In
Iheringia, Sér. Zool.. Publicado em: 2013-12