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| Registros recuperados: 62 | |
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| Bennett, Elena M.; Department of Natural Resource Sciences and McGill School of Environment, McGill University; elena.bennett@mcgill.ca. |
| Managing human-dominated landscapes such as agroecosystems is one of the main challenges facing society today. Decisions about land-use management in agroecosystems involve spatial and temporal trade-offs. The key scales at which these trades-offs occur are poorly understood for most systems, and quantitative assessments of the services provided by agroecosystems under different combinations of land uses are rare. To fill these knowledge gaps, we measured 12 ecosystem services (ES), including climate regulation, gas regulation, soil stability, nutrient regulation, habitat quality, raw material production, food production, fishing, sports, recreation, education, and social relationships, in seven common land-use types at three spatial scales, i.e., patch,... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agroecosystem; Ecosystem services; Floodplain; Interactions; Land uses; Spatial scales; Trade-offs. |
| Ano: 2014 |
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| Alves-Pereira,Alessandro; Peroni,Nivaldo; Cavallari,Marcelo Mattos; Lemes,Maristerra R.; Zucchi,Maria Imaculada; Clement,Charles R.. |
| Abstract Although manioc is well adapted to nutrient-poor Oxisols of Amazonia, ethnobotanical observations show that bitter manioc is also frequently cultivated in the highly fertile soils of the floodplains and Amazonian dark earths (ADE) along the middle Madeira River. Because different sets of varieties are grown in each soil type, and there are agronomic similarities between ADE and floodplain varieties, it was hypothesized that varieties grown in ADE and floodplain were more closely related to each other than either is to varieties grown in Oxisols. We tested this hypothesis evaluating the intra-varietal genetic diversity and the genetic relationships among manioc varieties commonly cultivated in Oxisols, ADE and floodplain soils. Genetic results did... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Microsatellites; Amazonian dark earths; Floodplain; Oxisols. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000300468 |
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| Bulla,Cíntia Karen; Gomes,Luiz Carlos; Miranda,Leandro Esteban; Agostinho,Angelo Antonio. |
| We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the wind and/or the increased water level were sufficient to transport macrophyte stands. Fish in the drifting mats were sampled with a floating sieve (4 m long x 2 m wide x 0.6 m high, and 2 mm mesh size). In the laboratory, larvae, juvenile, and adult fish were counted and identified to the lowest possible taxonomic level. In four drifting macrophyte mats we captured 218 individuals belonging to at least 28 species, 17 families, and 6 orders.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dispersion; Fish guilds; Floodplain; Free-floating plants; Freshwater fishes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200018 |
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| Massaro,Marthoni Vinicius; Pachla,Lucas Adriano; Bastian,Rodrigo; Pelicice,Fernando Mayer; Reynalte-Tataje,David Augusto. |
| ABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Floodplain; Migratory fish; Riparian vegetation; River channel. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210 |
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| Piana,Pitágoras A.; Cardoso,Bárbara F.; Dias,Joilson; Gomes,Luiz C.; Agostinho,Angelo A.; Miranda,Leandro E.. |
| ABSTRACT Populations show spatial-temporal fluctuations in abundance, partly due to random processes and partly due to self-regulatory processes. We evaluated the effects of various external factors on the population numerical abundance of curimba Prochilodus lineatus in the upper Paraná River floodplain, Brazil, over a 19-year period. Panel data analysis was applied to examine the structure of temporal and spatial abundance while controlling auto-regressive processes and spatial non-homogeneity variances that often obscure relationships. As sources of population variation, we considered predation, competition, selected abiotic variables, construction of a dam upstream of the study area, water level and flood intensity during the spawning period. We found... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic conditions; Biological interactions; Dam; Floodplain; Flood pulse. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000300203 |
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| Tondato,Karina Keyla; Mateus,Lúcia Aparecida de Fátima; Ziober,Simoni Ramalho. |
| An analysis was made of the spatial and temporal distribution of the abundance and composition of fish larvae assemblies, aiming to ascertain correlations with biotic and abiotic factors in marginal lagoons of the Cuiabá River floodplain in Brazil's Pantanal wetlands. Samples were collected bimonthly in the pelagic region of the marginal lagoons (fourteen lagoons) close to the littoral zone covered by aquatic macrophytes from December 2006 to April 2007. The captured individuals consisted of 2,739 larvae, represented predominantly by Triportheus spp. (Characidae), Parodontidae, Anostomidae, Characidae and Serrasalmidae. Larval density varied among the sample lagoons in December, but the biotic (zooplankton density) and abiotic (water temperature,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ichthyoplankton; Floodplain; Cuiabá River; Natural nurseries. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100015 |
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| Pompeu,Paulo dos Santos; Godinho,Hugo Pereira. |
| In the Neotropics, a large proportion of fish communities of large rivers use floodplain as habitats for feeding, reproduction, and refuge. An evaluation was made of the effects of extended dry periods on the species richness, abundance and local extinction of fish species in three marginal lagoons in the middle São Francisco River, southeastern Brazil. The studied lagoons fail to receive river floods during the study period (1994-1996). A gradual reduction in richness and abundance was observed in all lagoons. Migratory fish species had the highest probability to become extinct in the two lagoons that remained with large water volume. Species tolerant to low levels of dissolved oxygen had the lowest probability of local extinction in the lagoon showing an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Floodplain; Migratory fish; Extended drought; Hypoxia. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400006 |
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| Mendes-Júnior,Raimundo Nonato Gomes; Sá-Oliveira,Júlio César; Vasconcelos,Huann Carllo Gentil; Costa-Campos,Carlos Eduardo; Araújo,Andrea Soares. |
| ABSTRACT In this study, the composition of the diet and the feeding activity of Electrophorus varii were evaluated. The influence of ontogeny and seasonality in these feeding parameters was also examined. Fish were collected in the Curiaú River Basin, Amazon, Brazil, from March 2005 to February 2006, during the rainy (January-June) and dry (July-December) seasons. Diet composition was characterized based on the analysis of stomach contents and feeding dynamics was assessed based on the Stomach Fullness Index (IR) calculated using stomach weight. Stomach content and RI data were grouped into four-cm size classes (40-80, 80-120, 120-160, and 160-200) and two seasonal periods (rainy and dry). The influence of ontogeny and seasonality in the diet was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amapá; Electric fish; Feeding Activity; Floodplain; Piscivory. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300202 |
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| Beltran-Pedreros,Sandra; Zuanon,Jansen; Leite,Rosseval Galdino; Peleja,José Reinaldo Pacheco; Mendonça,Alessandra Barros; Forsberg,Bruce Rider. |
| Thirty-two species of commercially important fish from three trophic levels and nine trophic categories were sampled at a floodplain lake of the Solimões River (Lago Grande de Manacapuru). The fish were analyzed to determine their Hg level and the bioaccumulation, bioconcentration, and biomagnification of this element. The observed increase in mean concentration of mercury (49.6 ng.g-1 for omnivores, 418.3 ng.g-1 for piscivores, and 527.8 ng.g-1 for carnivores/necrophages) furnished evidence of biomagnification. Primary, secondary, and tertiary consumers presented biomagnification factors of 0.27, 0.33, and 0.47, respectively. Significant differences in the bioconcentration and concentration of total Hg occurred between the categories of the third trophic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomagnification; Ecotoxicology; Fish quality; Floodplain; Mercury contamination. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400022 |
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| Corrêa,Carlos Eduardo; Albrecht,Miriam Pilz; Hahn,Norma Segatti. |
| Spatial and temporal variations in patterns of niche breadth and feeding overlap were investigated for the fish fauna in the Pantanal region, aiming to determine the factors that account for species coexistence. Samples were conducted in the Cuiabá River and Chacororé pond, in the upper Pantanal region, Mato Grosso State, Brazil, during one hydrological cycle (March 2000 to February 2001), (designed spatial-seasonal units). Mean niche breadth values were overall low for the fish assemblage (0.2-0.3). Differences between periods were not statistically significant. Feeding overlap values ranged between 0 and 0.4, whereas the mean was always inferior to 0.05 in all spatial-temporal units, and differences between periods were not statistically significant. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coexistence; Diet; Fishes; Floodplain; Pantanal. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300017 |
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| Baumgartner,Gilmar; Nakatani,Keshiyu; Gomes,Luiz Carlos; Bialetzki,Andréa; Sanches,Paulo Vanderlei; Makrakis,Maristela Cavicchioli. |
| The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná River basin), from October 1994 to January 1995 (spawning season). Simultaneously, we obtained water temperature, pH, electrical conductivity, dissolved oxygen, water level, water velocity, and rainfall. Principal Component Analyses (PCA) and Detrended Correspondence Analyses (DCA) were applied to summarize abiotic and larvae density data, respectively. Amambaí River differed significantly from the other areas in relation to abiotic factors. Itaipu Reservoir differed significantly from the other areas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Larval ecology; Spatial distribution; Floodplain; Itaipu reservoir; Larval drift. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400002 |
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| Registros recuperados: 62 | |
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