scholarly journals Colonization by Chironomidae larvae in decomposition of Eichhornia azurea (Swartz) Kunth in an Amazonian lake in Brazil

2015 ◽  
Vol 37 (4) ◽  
pp. 449
Author(s):  
João Ânderson Fulan ◽  
Marcelo Rodrigues dos Anjos
Keyword(s):  
Eichhornia Azurea ◽  
Chironomidae Larvae ◽  
Amazonian Lake

scholarly journals Colonization by Chironomidae Larvae in Decomposition Leaves ofEichhornia azureain a Lentic System in Southeastern Brazil

2013 ◽  
Vol 13 (20) ◽  
pp. 1-13 ◽  
Author(s):  
Lidimara Souza da Silveira ◽  
Renato Tavares Martins ◽  
Guilherme Augusto da Silveira ◽  
Richard Michael Grazul ◽  
Danielle Pinheiro Lobo ◽  
...  
Keyword(s):  
Southeastern Brazil ◽  
Chironomidae Larvae ◽  
Lentic System

The pirarucu net: Artefact, animism and the technical object

2018 ◽  
Vol 24 (2) ◽  
pp. 176-193 ◽  
Author(s):  
Carlos Emanuel Sautchuk
Keyword(s):  
Technical Object ◽  
Anthropological Approach ◽  
Gilbert Simondon ◽  
Modes Of Existence ◽  
Amazonian Lake ◽  
The Way

This article explores the decision of a group of Amazonian lake fishermen to ban the use of nets to catch the pirarucu fish as part of an official agreement. It discusses the approach to artefacts found in the agentive turn and in recent explorations of Amazonian animism in Anthropology. It adopts the concept of technical object influenced by the anthropological approach to technology and in line with the ontogenetic perspective of Gilbert Simondon. The main focus is the way in which the fishermen compare the different modes of existence of the harpoon and the net. For them, the pirarucu net is a poor way to catch fish since it captures by itself, which is a form of cowardice in relation to the fish and drives them away. The ethnography centres on the operation of these objects and the way in which different properties of the fishermen and fish emerge through these processes.

scholarly journals Ocorrência de plantas aquáticas nos reservatórios da Light-RJ

2003 ◽  
Vol 21 (spe) ◽  
pp. 105-108 ◽  
Author(s):  
D. Martins ◽  
E.D. Velini ◽  
R.A. Piteli ◽  
M, S. Tomazella ◽  
E. Negrisoli
Keyword(s):  
Eichhornia Crassipes ◽  
Egeria Densa ◽  
Eichhornia Azurea

O objetivo do presente trabalho foi caracterizar as comunidades infestantes de plantas aquáticas presentes nos reservatórios da Light-Sistema de Eletricidade S.A., localizada no município de Piraí-RJ. Os levantamentos foram realizados no período de julho a setembro de 1998. Os reservatórios analisados foram: Vigário, Pereira Passos e Lajes, sendo as quantidades de pontos amostrados de 19, 9 e 15, respectivamente. Em cada ponto amostrado fez-se a marcação das coordenadas geográficas e avaliou-se a porcentagem de ocupação do corpo d'água pelas espécies de plantas aquáticas presentes. Depois da identificação das plantas, pôde-se verificar quais eram as espécies mais freqüentes e a sua distribuição dentro do sistema de geração de energia. As espécies encontradas nos reservatórios foram: Brachiaria arrecta (Hack.) Stent.; Egeria densa Planch.; Eichhornia azurea (Sw.) Kunth.; Eichhornia crassipes (Mart.) Solms.; Hymenachne amplexicaulis (Rudge) Nees.; Panicum rivulare Trin.; Pistia stratiotis L.; Polygonum spp.; Sagitaria montevidensis Cham. & Schlecht; Salvinia auriculata (Micheli) Adans; e Thypha dominguensis L.

scholarly journals Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

2008 ◽  
Vol 68 (1) ◽  
pp. 61-67 ◽  
Author(s):  
I. Bianchini Jr. ◽  
MB. Cunha-Santino ◽  
AM. Peret
Keyword(s):  
Aquatic Macrophytes ◽  
Oxygen Demand ◽  
Oxbow Lake ◽  
Short Term ◽  
River Floodplain ◽  
Dissolved Carbon ◽  
Eichhornia Azurea ◽  
Aerobic Decomposition ◽  
Cyperus Giganteus ◽  
Egeria Najas

This study presents a kinetic model of oxygen consumption during aerobic decomposition of detritus from seven species of aquatic macrophytes: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense and Utricularia breviscapa. The aquatic macrophytes were collected from Óleo Lagoon situated in the Mogi-Guaçu river floodplain (SP, Brazil). Mineralization experiments were performed using the closed bottles method. Incubations made with lake water and macrophytes detritus (500 mL and 200 mg.L-1 (DM), respectively) were maintained during 45 to 80 days at 20 °C under aerobic conditions and darkness. Carbon content of leachates from aquatic macrophytes detritus and dissolved oxygen concentrations were analyzed. From the results we concluded that: i) the decomposition constants differ among macrophytes; these differences being dependent primarily on molecular and elemental composition of detritus and ii) in the short term, most of the oxygen demand seems to depend upon the demineralization of the dissolved carbon fraction.

scholarly journals Leaf decomposition of the macrophyte Eichhornia azurea and associated microorganisms and invertebrates

2018 ◽  
Vol 19 (1) ◽  
pp. 53-66
Author(s):  
C. Vieira da Silva ◽  
I. Bianchini ◽  
J. F. Gonçalves ◽  
R. A. Oliveira ◽  
R. Henry
Keyword(s):  
Leaf Decomposition ◽  
Eichhornia Azurea

scholarly journals CONTRIBUIÇÃO DA DECOMPOSIÇÃO DE MACRÓFITAS AQUÁTICAS (Eichhornia azurea) NA MATÉRIA ORGÂNICA DISSOLVIDA

2008 ◽  
Vol 12 (01) ◽  
pp. 42-56 ◽  
Author(s):  
Júlio César Rodrigues de Azevedo ◽  
Alinne Mizukawa ◽  
Mariana Carolina Teixeira ◽  
Thomaz Aurélio Pagioro
Keyword(s):  
Eichhornia Azurea

scholarly journals Biología Floral de Eichhornia Azurea (Swartz) Kunth (Pontederiaceae)

2005 ◽  
Vol 1 (12) ◽  
pp. 128-135
Author(s):  
Víctor H. Lallana ◽  
María C. Marta
Keyword(s):  
Eichhornia Azurea

scholarly journals Hábitos alimentarios de quironómidos (Diptera: Chironomidae) en lagos del páramo de Chingaza, Colombia

2017 ◽  
Vol 66 (1) ◽  
pp. 136 ◽  
Author(s):  
Yulibey Caleño Ruiz ◽  
Carlos Alberto Rivera Rondon ◽  
Hernando Ovalle
Keyword(s):  
Dietary Habits ◽  
Feeding Habits ◽  
Diet Overlap ◽  
Gut Contents ◽  
High Mountain ◽  
Trophic Guilds ◽  
Use Of Resources ◽  
Fine Particulate ◽  
Chironomidae Larvae ◽  
Well Differentiated

Tropical high mountain lakes show unique environmental conditions where chironomids play an important role in ecosystem functioning. The characteristics of these environments could favor diet overlap and therefore a high interspecific competition. This study described the dietary habits of chironomid genera, identified whether the dietary habits were specialized or generalist, and analyzed the diet overlap in the genera. Chironomidae larvae were collected from four lakes of the Chingaza paramo during the dry season, between April and May of 2 016. The feeding habits of larvae were evaluated by analyzing gut contents following standard methods. Each genus was assigned to trophic guilds (carnivore, detritivore and algivore) and the diet overlap was estimated using the Pinka's index. A total of 1 003 individuals were collected and nine genera were identified. Larvae consumed mainly fine particulate organic matter (FPOM), algae, macrophyte fragments, macroinvertebrates, and animal tissues. FPOM was the main feeding resource of detritivores. The analysis of diets showed a high affinity of each genus for a single trophic guild and most of the genera were generalist in the use of resources. For all lakes, high levels of diet overlap were observed among genera and trophic guilds, mainly among detritivores. Our results suggested that Chironomidae larvae of these lakes presented well differentiated trophic habits, and showed a moderate diet overlap within detritivores and carnivores.

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