Lotic Environments
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Comparative study of the chemical composition, fatty acid profile, and nutritional quality of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae), a Brazilian carnivorous freshwater fish, grown in lotic, lentic, and aquaculture environments
RESUMO Lophiosilurus alexandri é um peixe de água doce, carnívoro, endêmico da bacia do rio São Francisco e encontra-se vulnerável a extinção. Neste estudo, analisamos a composição química (umidade, cinzas, lipídeos e proteína), o perfil de ácidos graxos e qualidade nutricional (índices de aterogênicidade e trombogenicidade, razão entre áci
Neotrop. ichthyol.. Publicado em: 02/12/2019
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2. Ichthyofauna of lotic environments in the Ivinhema river basin, upper Paraná river, Mato Grosso do Sul state, Brazil
Resumo: Com o objetivo de inventariar a riqueza de espécies e a composição da ictiofauna ao longo da bacia do rio Ivinhema, 232 trechos de rios e riachos foram amostrados de 2000 a 2018, utilizando uma peneira retangular, rede de arrasto, rede de espera, tarrafas e pesca elétrica. Ao todo 141 espécies foram amostradas na bacia, incluindo oito ordens e 3
Biota Neotrop.. Publicado em: 15/07/2019
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3. Influence of temperature and conductivity on the life-history characteristics of a pampean strain of Brachionus plicatilis
ABSTRACT In the present work, we provide the first approach about the life-history of Brachionus plicatilis in South America. We tested with laboratory experiments the response of the pampean strain of B. plicatilis for two of its main stressors (conductivity and temperature). We evaluated the effects of eight conductivity values from 1 to 17 mS.cm-1 and two
An. Acad. Bras. Ciênc.. Publicado em: 14/05/2018
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4. 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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5. 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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6. 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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7. 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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8. 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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9. Taxonomic studies of centric diatoms (Diatomeae): unusual nanoplanktonic forms and new records for Brazil
There have been few taxonomic studies of centric diatoms in lotic freshwater environments in Brazil, especially in terms of those including nanoplanktonic forms, which are often neglected in studies of local floras, because of their small size or confusing taxonomy. This is the first study focusing on centric diatoms in the flora of the state of Bahia, in no
Acta Bot. Bras.. Publicado em: 2013-06
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10. Avaliação do papel das perturbações físicas do substrato sobre a fauna de macroinvertebrados aquáticos de um riacho neotropical / Assessing the role of substrate physical disturbance on the aquatic macroinvertebrate fauna of a Neotropical stream.
O presente trabalho testou o efeito da frequência, intensidade e tamanho da área de perturbações físicas sobre a comunidade de macroinvertebrados aquáticos, visando responder as seguintes questões: 1) a abundância, riqueza e composição dos macroinvertebrados são afetadas pelas perturbações físicas? 2) os resultados encontrados se enquadram nas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2012
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11. Planktonic diatoms in lotic and lentic environments in the Lago dos Tigres hydrologic system (Britânia, Goiás, Brazil): Coscinodiscophyceae and Fragilariophyceae
A floristic study of Coscinodiscophyceae and Fragilariophyceae in the Lago dos Tigres hydrologic system is presented. Phytoplankton samples were collected with a plankton net (25 µm mesh) at 11 sampling stations, three in lotic areas and eight in lacustrine zones. Eleven species of Coscinodiscophyceae and eight of Fragilariophyceae were identified; descript
Braz. J. Bot.. Publicado em: 2012
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12. 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