Oligotrophic
Mostrando 13-24 de 152 artigos, teses e dissertações.
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13. Cellulase activity and dissolved organic carbon release from lignocellulose macrophyte-derived in four trophic conditions
Abstract Considering the importance of lignocellulose macrophyte-derived for the energy flux in aquatic ecosystems and the nutrient concentrations as a function of force which influences the decomposition process, this study aims to relate the enzymatic activity and lignocellulose hydrolysis in different trophic statuses. Water samples and two macrophyte spe
Braz. J. Microbiol.. Publicado em: 2016-06
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14. Enzymatic Activity in the Gastrointestinal Tract of Pimelodus maculatus (Teleostei, Siluriformes) in Two Neotropical Reservoirs with Different Trophic Conditions
Enzymatic activities for digestion of proteins and carbohydrates were compared among three organs of the digestive system of Pimelodus maculatus in two reservoirs with different trophic conditions during the winter of 2006. The aim was to test the hypothesis that enzymatic activity for the digestion of proteins and carbohydrates differed among organs and tha
Braz. arch. biol. technol.. Publicado em: 2015-08
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15. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda)
Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902), which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S) and in shallow mountain lakes north of 39°S
Iheringia, Sér. Zool.. Publicado em: 2012-12
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16. O efeito do solo, inundação e topografia sobre as campinaranas inundáveis na Amazônia
Little is known about the factors that determine the spatial variation in structure, floristic composition and diversity in the Amazon Campinaranas. The Campinaranas are characterized by predominantly oligotrophic sandy soils. In the Negro River basin, they occur in a mosaic of grassland formations, forest and savanna, often associated with flooding. To infe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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17. Reproductive plasticity of Hypostomus affinis (Siluriformes: Loricariidae) as a mechanism to adapt to a reservoir with poor habitat complexity
In this work we describe the gonad morphology and spawning season of Hypostomus affinis (Steindachner, 1877) in a tropical reservoir based on 55 males and 125 females. Our aim was to assess eventual adaptations in reproductive tactics developed by this riverine species inhabiting an oligotrophic reservoir with low habitat complexity, few rocks and few other
Zoologia (Curitiba). Publicado em: 2011-10
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18. Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams
The aim of this study was to investigate the post-dam conditions of the loads and yields of dissolved inorganic nitrogen (DIN), orthophosphate (DIP, silicate (DSi) and total phosphorous (TP) in the Lower São Francisco river estuary (NE-Brazil) after the river was regulated to a constant flow by the dams. Loads and yields of monthly measurements performed fr
Brazilian Archives of Biology and Technology. Publicado em: 2011-04
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19. Micorriza arbuscular: um bioindicador da fertilidade dos solos e da distribuição de árvores no bioma cerrado.
RESUMO: A grande variedade de fitofisionomias existentes no Bioma Cerrado tem sido associada a diferentes fatores ambientais como clima, relevo, geologia, entre outros. O fator solo exerce influência fundamental nessa diversidade ambiental. As suas características químicas, físico-hídricas e biológicas formam um complexo de inter-relações, muitas vez
Planaltina. Publicado em: 2011
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20. Species assemblages of zooplanktonic crustaceans in mountain shallow ponds of Chile (Parque Cañi)
Even though the Chilean lakes are characterized by their oligotrophy, a transition from oligotrophy to mesotrophy, due human intervention, has been reported in some lakes. Nevertheless, there are still some pristine and unpolluted small lakes and ponds in mountain zones, free of human intervention and surrounded by native forests. Nine unpolluted, oligotroph
Zoologia (Curitiba). Publicado em: 2010-02
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21. COMUNIDADE DE ALGAS EPIFÍTICAS (COM ÊNFASE EM DIATOMÁCEAS) EM 23 VEREDAS DO ESTADO DE GOIÁS SOB DIFERENTES IMPACTOS AMBIENTAIS / Epiphytic algae community (with emphasis on diatoms) of Palm swamps of Goias State
(Epiphytic algae community of (with emphasis on diatoms) of Palm swamps of Goias State). The present study is the first to evaluating epiphytic algae community structure of in the subsystem Palm swamps in the Cerrado. The general hypotheses of this study were: impacted Palm swamps are under greater influence of allochthonous material, causing changes in limn
Publicado em: 2010
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22. Produtividade fitoplactÃnica e hidrologia no ecossistema recifal de Porto de Galinhas (Pernambuco- Brasil)
The Porto de Galinhas beach, located in the south coast of Pernambuco, Brazil, about 50 kilometers from Recife, has coral reef formations that form natural pools of extreme beauty, and thus, actually is undergoing an intense tourist activity, as one of the most visited beaches of Northeastern Brazil. The phytoplankton productivity and biomass and some hydrol
Publicado em: 2009
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23. Uso do solo na Bacia Hidrográfica do rio Camboriú (SC) e sua influência sobre a qualidade da água
The watershed of the Camboriú River is located in the cities of Camboriú and Balneário Camboriú. With a length of around 40 kilometers, it drains an area of 200 km2. This paper aims to characterize the Camboriú River watershed by determining space-time variations of physical, chemical and biological parameters of superficial water, as well as the soil o
Publicado em: 2009
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24. Flora diatomácea do reservatório de Tanque Grande, município de Guarulhos SP como indicadora da qualidade de água
The Tanque Grande Reservoir is responsible for supplying 10% of the total population of the city of Guarulhos, State of São Paulo, Brazil. It was constructed in order to dam the Tanque Grande River waters, an affluent of the Baquirivu-Guaçu River, which flows to the Tietê River, within the Greater São Paulo Metropolitan area. The reservoir is located wit
Publicado em: 2008