Bioturbation
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Pedodiagenetic Characterization of Cretaceous Paleosols in Southwest Minas Gerais, Brazil
ABSTRACT The influence of post-burial geological processes on preserving pedogenic properties has great importance in identifying ancient paleosols both in the field and in a laboratory. However there are not many publications that focus on characterizing paleosol diagenesis. As temperature and pressure progressively increase, evidence of pedogenesis is modi
Rev. Bras. Ciênc. Solo. Publicado em: 06/02/2017
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2. Estruturas biogênicas em latossolos de chapadões, Uberlândia MG / Biogenic structures in Oxisols of Chapadões, Uberlândia, MG
The biological activity in soil can interfere enough on its morphology, particularly in the structure as to be considered in the classification system developed soils (Soil Taxonomy). In tropical conditions the magnitude of the effects of biological activity in soil is even greater. However, morphological characteristics of biogenic nature has not been taken
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2012
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3. Nature et propriétés de l'horizon diagnostic de Latosols du Plateau Central brésilien.
The Latosols correspond to about 40% of the Brazilian Central Plateau. They are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure resulting in microaggregates 50 to 300um in size. Ten Latosols (L) were selected along a 350-km long regional toposequence across the South American Surf
2009.. Publicado em: 2011
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4. BiogeoquÃmica de solos de manguezal do rio Jaguaribe (Brasil - CE) em resposta a bioturbaÃÃo por caranguejos / Biogeochemistry of mangrove soil of the river Jaguaribe (Brazil - EC) in response to bioturbation by crabs
Os manguezais sÃo ecossistemas costeiros tropicais com elevada biodiversidade, composta por Ãrvores e arbustos com grande tolerÃncia as Ãguas salgadas ou salobras e por animais tÃpicos dessas regiÃes. Dentre os representantes da fauna, os caranguejos destacam-se tanto por seu grande nÃmero de espÃcies quanto por sua importÃncia ecolÃgica e econÃmi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/08/2010
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5. Avaliação de métodos de campo para a determinação de condutividade hidráulica em meios saturados e não saturados
The determination of the hydraulic conductivity of saturated insaturated media for hydrogeologic research is a frequent activity, to academic studies and for practical works. This hydrodynamic parameter is determined by in situ measures, for the insaturated zone the concentric rings and open end hole methodologies are applied and for the saturated zone the s
Publicado em: 2010
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6. Geobiologia do Atol das Rocas, Atlântico Sul Equatorial
This thesis approaches the geobiology of the only Atoll in the South Atlantic Ocean. Different classifications were made for Rocas Reef Complex along the nineteenth and twentieth century, which are evaluated historically. Biogeomorphological analysis and mapping of the reef units were done on the Rocas Atoll for the comprehension of the sedimentary dynamic a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2009
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7. Relationship amomg benthic communities and sedimentary organic matter: responses to the quality of food resources and influence on early diagenesis / Relações entre as comunidades bênticas e a matéria orgânica sedimentar: respostas à qualidade dos recursos alimentares e influência na diagênese recente
A qualidade da matéria orgânica e a magnitude de suas deposições estão entre os principais fatores que controlam as respostas dos organismos bênticos marinhos. Uma vez depositada nos sedimentos, a matéria orgânica é degradada por processos biogeoquímicos microbianos, que podem ser acelerados mediante a bioturbação da macrofauna. Entretanto, em re
Publicado em: 2008
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8. Nodularia (Cyanobacteriaceae) Akinetes in the Sediments of the Peel-Harvey Estuary, Western Australia: Potential Inoculum Source for Nodularia Blooms
The populations of viable Nodularia (Cyanobacteriaceae) propagules in the sediments of the Peel-Harvey Estuary in Western Australia were assessed over location, time, and depth. The sediments of the Harvey Estuary had greater numbers of Nodularia propagules than those of the contiguous Peel Inlet. This was consistent with the distribution of Nodularia blooms
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9. Distribution of sewage indicated by Clostridium perfringens at a deep-water disposal site after cessation of sewage disposal.
Clostridium perfringens, a marker of domestic sewage contamination, was enumerated in sediment samples obtained from the vicinity of the 106-Mile Site 1 month and 1 year after cessation of sewage disposal at this site. C. perfringens counts in sediments collected at the disposal site and from stations 26 nautical miles (ca. 48 km) and 50 nautical miles (ca.
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10. Oxygen and evolutionary patterns in the sea: Onshore/offshore trends and recent recruitment of deep-sea faunas
Over the last 15 years a striking pattern of diversification has been documented in the fossil record of benthic marine invertebrates. Higher taxa (orders) tend to originate onshore, diversify offshore, and retreat into deep-water environments. Previous studies attribute this macroevolutionary pattern to a variety of causes, foremost among them the role of n
The National Academy of Sciences.
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11. Interception of Small Particles by Flocculent Structures, Sessile Ciliates, and the Basic Layer of a Wastewater Biofilm
We investigated attachment processes of hydrophobic and hydrophilic particles (diameter = 1 μm) to mature biofilms grown on clay marbles in a sequencing batch biofilm reactor. During a treatment cycle with filtered wastewater containing different fluorescent beads, the progression of particle density in various biofilm compartments (carrier biofilm, basic b
American Society for Microbiology.
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12. Denitrification, Dissimilatory Reduction of Nitrate to Ammonium, and Nitrification in a Bioturbated Estuarine Sediment as Measured with 15N and Microsensor Techniques
Nitrogen and oxygen transformations were studied in a bioturbated (reworked by animals) estuarine sediment (Norsminde Fjord, Denmark) by using a combination of 15N isotope (NO3-), specific inhibitor (C2H2), and microsensor (N2O and O2) techniques in a continuous-flow core system. The estuarine water was NO3- rich (125 to 600 μM), and NO3- was consistently t