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| Registros recuperados: 12 | |
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| Scheffer, Marten; Wageningen Agricultural University; Marten.Scheffer@wur.nl. |
| Despite the huge scientific progress of the last century, the dynamics of complex systems such as the atmosphere, human societies, and ecosystems remain difficult to understand and predict. Nonetheless, our ability to carve the future depends largely on our insight into the functioning of such complex systems. Complex systems are the focus of considerable mathematical theory. Rather than referring to any particular part of the world, such theory addresses what seems to be another world: a world of strange attractors, catastrophe folds, torus destruction, and homoclinic bifurcations. So disparate is the language and notation in this discipline that it is hard to imagine that it has any thing to do with reality as we know it. Indeed, it deals with a kind of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Bifurcation; Catastrophe; Chaos; Cycle; Daphnia; Fish; Macrophyte; Model; Multiple stable states; Plankton; Predation; Trophic cascade. |
| Ano: 1999 |
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| Silva,Jersei N.; Oliveira,Guilherme de; Rocha,Sérgio S. da. |
| ABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macrophyte; Population structure; Reproduction; Spatial distribution. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227 |
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| Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte. |
| This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon... |
| Tipo: Text |
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf |
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| Feitosa,Malu Christine Barbosa; Querino,Ranyse Barbosa; Hamada,Neusa. |
| ABSTRACT Anagrus amazonensis Triapitsyn, Querino & Feitosa (Hymenoptera, Mymaridae) is a parasitoid that uses aquatic insect eggs as a host for the development of its immature stages. The objectives of this study are to record the interaction between A. amazonensis and its hosts and the aquatic plants used by these hosts to lay their eggs. Field work was conducted in floodplain lakes and upland (terra firme) streams, in four municipalities in Amazonas State, Brazil, where aquatic plants were scanned for the presence of aquatic insect eggs. In the laboratory, eggs were maintained in plastic containers with water until the emergence of the parasitoid or of the first instar insect. A total of 1223 adults of A. amazonensis emerged from eggs of Hemiptera,... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Amazonia; Aquatic Hymenoptera; Macrophyte; Trophic interaction. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262016000300267 |
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| Tamires PETRY,Camila; Trindade COSTA,Daiane; DROSTE,Annette. |
| ABSTRACT A promising method for the treatment of effluents is the use of floating macrophytes. Ammoniacal nitrogen is a typical compound present in urban landfill leachates and its removal is important due its toxicity to several organisms. Therefore, the study evaluated Typha domingensis survival and nitrification potential artificially floating in domestic solid waste leachate. Plants were exposed for 35 days to leachate (100, 75 and 50 %) and to rainwater with N:P:K (control). Dissolved oxygen (DO) of the treatments was periodically measured, and ammoniacal nitrogen, nitrite and nitrate were analyzed before and after exposure. At the end of the experiment, plant survival rate was calculated. After two weeks, DO increased twice in the control, three... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattail; Macrophyte; Nitrification; Phytoremediation. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000100005 |
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| Dutra Júnior, Wilson Moreira; UFRPE; Carvalho, Deorlanda Maria da Silva; UFRPE; Rabello, Carlos Bôa-Viagem; UFRPE; Ludke, Maria do Carmo Mohaut Marques; UFRPE; Almeida, Gustavo Henrique Novaes de; UFRPE; Lima, Stelio Bezerra Pinheiro; UFRPE. |
| O objetivo deste trabalho foi avaliar o desempenho zootécnico, o rendimento de carcaça e a viabilidade econômica da inclusão da elódea brasileira (Egeria densa) em rações para suínos nas fases de crescimento e terminação. Foram utilizadas 32 fêmeas suínas, linhagem comercial Dalland C-40, com peso vivo inicial de 23 ± 1,05 kg, distribuídos em delineamento inteiramente ao acaso. Os tratamentos experimentais consistiram de quatro rações isoenergéticas e isoproteicas com níveis crescentes de inclusão da elódea (0, 5, 10 e 15%). A inclusão da elódea influenciou de forma quadrática o consumo de ração, reduziu linearmente o ganho de peso médio diário e aumentou linearmente a conversão alimentar. O peso de carcaça quente o rendimento de carcaça e a... |
| Tipo: Pesquisa de campo |
Palavras-chave: 5.04.00.00-2 Zootecnia desempenho zootécnico; Fibra dietética; Macrófita; Rendimento de carcaça Nutrição e Alimentação Animal performance; Dietary fiber; Macrophyte; Yield carcass. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/3587 |
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| Sipaúba-Tavares, Lúcia Helena; UNESP - Jaboticabal; Braga, Francisco Manoel de Souza; UNEP Rio Claro. |
| Variáveis físico-químicas da água e do solo foram avaliadas a fim de verificar a eficiência de um “wetland” construído no tratamento de resíduos. Foram escolhidas oito espécies de macrófitas baseadas na capacidade de retenção e disponibilidade no local de estudo. Dentre elas estão: Eichhornia crassipes, Alternanthera philoxerodos, Heteranthera reniformis, Hydrocotyle umbeliferae, Ludwigia elegan, Ludwigia sericea, Myriophyllum aquaticum e Thypha domingensis. Foram amostrados dois pontos um na entrada e outro na saída de água do “wetland”. Diferenças significativas (p < 0,05) foram observadas entre a entrada e saída do “wetland” em relação às variáveis limnológicas. Em geral, foram observadas concentrações de oxigênio dissolvido acima de 4 mg L-1 e de... |
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Palavras-chave: 2.00.00.00-6 Ciências Biológicas effluent; Wastewater; Physical and chemical parameters; Macrophyte. effluent; Wastewater; Physical and chemical parameters; Macrophyte. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5002 |
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| Castilho-Noll,Maria Stela Maioli; Câmara,Carolina Figueira; Chicone,Maira Favaron; Shibata,Érico Hissashi. |
| There are few studies on the zooplankton from the northwestern region of São Paulo State, Brazil, compared to other regions of the State. Cladocerans are a very representative zooplankton group with high species diversity. Most of this diversity can be found at littoral zones of lakes and reservoirs, especially those occupied by macrophytes. This study was part of a thematic project FAPESP/BIOTA Program - The Virtual Institute of Biodiversity (www.biotasp.org.br), and its aim is to catalogue and analyze the distribution of cladoceran species (Crustacea, Anomopoda and Ctenopoda) in pelagic and littoral zones from small reservoirs in the northwest of the São Paulo State, in dry and rainy seasons. Zooplankton samplings were carried out in littoral and pelagic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cladocerans; Chydoridae; Littoral zone; Macrophyte; Northwest of São Paulo State; Shallow lakes. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000100001 |
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| POMPÊO,M. L. M.; HENRY,R.; MOSCHINI-CARLOS,V.. |
| In the Paranapanema River mouth, Jurumirim Reservoir (23°27'-23°29'S and 48°39'-48°36'W, SP, Brazil), the biomass of E. polystachya was monthly determined with eight quadrats of 0.25 m² from August 1993 to July 1994. The seasonal variation in biomass was unimodal, with greater biomass from November 1993 to April 1994. The average biomass was 1,933.7 ± 479.5 gDW.m-2, with a variation along the year from 1,149.0 to 2,755.9 gDW.m-2. The annual variation of aerial green biomass, aerial and aquatic detritus suggest that the main growth period of E. polystachya was from December 1993 to May 1994, with peak between February to March 1994. The data indicate that this macrophyte is adapted to water level variation. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macrophyte; Echinochloa; Biomass; Water level variation; Reservoir; Poaceae. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100004 |
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| Registros recuperados: 12 | |
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