Benthic Invertebrates
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Effects of taxonomic resolution of benthic invertebrates in the assessment of lotic ecosystem s quality / Efeitos da resolução taxonômica de invertebrados bentônicos no diagnóstico da qualidade de ecossistemas lóticos
Nas últimas décadas, tem-se observado uma expressiva queda da qualidade ambiental e perda de biodiversidade nos ecossistemas aquáticos em função de múltiplos impactos advindos de atividades antrópicas. Dessa forma, considerando-se que a estrutura das comunidades pode ser alterada por tais perturbações, diversos métodos têm sido propostos para aval
Publicado em: 2007
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14. Life cicle aspects of endemic benthic species and its aplication on the sediment quality assesments of natural lakes and reservoirs / Aspectos do ciclo de vida de espécies bentônicas nativas e sua utilização na avaliação da qualidade de sedimentos de lagos naturais e reservatórios
The ecological studies, with views for the conservation of the environment, have been intensified from middles of the century XX. Due to the integration with several other sciences during the process of ecological knowledge formation, those studies have become essential to the development of technologies and appropriate politics for the administration of the
Publicado em: 2007
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15. A ictiofauna do estuário do rio Itanhaém, SP, Brasil: dinâmica espaço-temporal e aspectos biológicos das espécies principais / Itanhaém River Estuary, SP, Brazil: Spatial and seasonal changes in fish assemblages and biological aspects of the principal species
The changes of the composition and the distribution of the fishes along the Itanhaém River Estuary were investigated, between May 2002 and April 2003. Biologic aspects of principal species were also included. The month sampling of the fishes was performed using otter trawls in three different areas in the estuary (A1, A2 and A3). Samples were also collected
Publicado em: 2007
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16. Avaliação da qualidade ambiental, utilizando invertebrados bentônicos, nos rios Atibaia, Atibainha e Cachoeira, SP / Envitonmental quality assessment using benthic invertebrates: Atibaia, Atibainha, and Cahoeira rivers, São Paulo, Brazil
Immature insects of the Orders Ephemeroptera, Plecoptera and Trichoptera (EPT) are considered sensible members of the macrobenthic community in lotic ecosystems. Accordingly, they are often used as indicators of environmental disturbances as pollution. Eight sampling sites were established along the rivers Atibainha, Cachoeira and Atibaia of Piracicaba river
Publicado em: 2006
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17. EFEITOS DO PETRÓLEO SOBRE A ASSOCIAÇÃO DE MACROINVERTEBRADOS BENTÔNICOS DE PRAIAS ARENOSAS DO EXTREMO SUL DO BRASIL.
The benthic marine organisms in the sand beach intertidal zone have a great ecological complexity, being a major trophic link among the phytoplankton, organic detritus and the higher trophic levels. Any anthropogenic disturbance that affects these organisms, such as an oil spill can cause changes in all trophic levels of coastal communities. Due to their sed
Publicado em: 2005
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18. Fontes autotróficas de energia para peixes do canal principal e quelônios ao longo da bacia do médio rio Negro, Amazônia Brasil
The main channel of the middle rio Negro basin is characterized by high concentrations of dissolved organic matter, low nutrient levels and low primary production. The principal autotrophs in the river system are phytoplankton, periphyton, and flooded-forest (igapó) trees. Leaves, fruits and seeds fall from igapó forests are responsible for 99% of autotrop
Publicado em: 2005
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19. Estrutura da comunidade de invertebrados bentônicos em dois cursos d'água do Rio Grande do Sul, Brasil
The benthic fauna has an important role in the trophic chain of limnic environments, serving as food for fishes and crustaceans. This work aimed to identify and compare, quantitative and qualitatively, the macrobenthic communities from two watercourses in Rio Grande do Sul State. Samplings were done with a Surber sampler, monthly, from September 1999 to Augu
Revista Brasileira de Zoologia. Publicado em: 2003-03
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20. INFLUÊNCIA DO PULSO DE INUNDAÇÃO NA COMPOSIÇÃO ISOTÓPICA (d13C E d15N) DAS FONTES PRIMÁRIAS DE ENERGIA NA PLANÍCIE DE INUNDAÇÃO DO RIO PARAGUAI (PANTANAL MS) / SEASONAL PATTERN DETERMINING PRIMARY ENERGY SOURCES d13C AND d15N IN THE PARAGUAY RIVER FLOODPLAIN TROPHIC WEB, PANTANAL WETLAND - BRAZIL
The food web of the Pantanal wetland in Brazil was investigated during a complete hydrologic cycle (1998-99) using a multiple stable isotope approach (d13C and d15N) with the goal of identifying the primary carbon sources, which drive the system energy flux. The sampling was done in a representative marginal lake (Baía do Castelo) of Paraguay River floodpla
Publicado em: 2003
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21. Influência do cultivo de mexilhões sobre o habitat bentônico na Enseada da Armação do Itapocoroy, Penha, SC.
Mussel culture is an important activity in the state of Santa Catarina, where is developed in almost all the bays and roadsteads. This activity places the state in evidence in Latin Americas production. However, this development has been spread in a disorganized way, generating environmental impacts, mainly those arisen from bio deposition of organic materia
Publicado em: 2002
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22. Genetic variability in krill.
We have estimated genetic variability by gel electrophoresis in three species of krill, genus Euphausia (Arthropoda: Crustacea). Genetic variability is low where trophic resources are most seasonal, and high where trophic resources are most stable. Simlar trends have been found in benthic marine invertebrates. The observed trends of genetic variability do no
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23. Distribution of Clostridium perfringens and Fecal Sterols in a Benthic Coastal Marine Environment Influenced by the Sewage Outfall from McMurdo Station, Antarctica†
The spatial distribution, movement, and impact of the untreated wastewater outfall from McMurdo Station, Antarctica, were investigated under early austral summer conditions. The benthic environment was examined to determine the distribution of Clostridium perfringens in sediment cores and the intestinal contents of native invertebrates and fish along a trans
American Society for Microbiology.
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24. Benthic–pelagic links and rocky intertidal communities: Bottom-up effects on top-down control?
Insight into the dependence of benthic communities on biological and physical processes in nearshore pelagic environments, long considered a “black box,” has eluded ecologists. In rocky intertidal communities at Oregon coastal sites 80 km apart, differences in abundance of sessile invertebrates, herbivores, carnivores, and macrophytes in the low zone wer
The National Academy of Sciences of the USA.