20 documents found, page 1 of 2
Os peixes da Floresta Nacional de Caxiuanã (municípios de Melgaço e Portel, Par...
Montag, Luciano Fogaça de Assis; Freitas, Tiago Magalhães da Silva; Wosiacki, Wolmar Benjamin; Barthem, Ronaldo BorgesCom o objetivo de inventariar as espécies de peixes dos sistemas hídricos da Floresta Nacional (FLONA) de Caxiuanã (Melgaço/Portel, PA), foram realizadas coletas entre os anos de 1999 e 2004, abrangendo o maior número de ambientes distinguíveis com diversos métodos amostrais. Os métodos utilizados foram redes de tapagem, rede de cerco, rede de espera, mergulho livre e encontros ocasionais. Em um total de 208 es...
The potential impact of new Andean dams on Amazon fluvial ecosystems
Forsberg, Bruce Rider; Melack, John M.; Dunne, Thomas; Barthem, Ronaldo Borges; Goulding, Michael; Paiva, Rodrigo C.D.; Sorribas, Mino VianaIncreased energy demand has led to plans for building many new dams in the western Amazon, mostly in the Andean region. Historical data and mechanistic scenarios are used to examine potential impacts above and below six of the largest dams planned for the region, including reductions in downstream sediment and nutrient supplies, changes in downstream flood pulse, changes in upstream and downstream fish yields, ...
Modelling the growth of tambaqui, Colossoma macropomum (Cuvier, 1816) in floodp...
Costa, Luiz R F; Barthem, Ronaldo Borges; Albernaz, Ana Luísa Kerti Mangabeira; Bittencourt, Maria Mercedes; Villacorta-Corrêa, Marle AngélicaThe tambaqui, Colossoma macropomum, is one of the most commercially valuable Amazonian fish species, and in the floodplains of the region, they are caught in both rivers and lakes. Most growth studies on this species to date have adjusted only one growth model, the von Bertalanffy, without considering its possible uncertainties. In this study, four different models (von Bertalanffy, Logistic, Gompertz and the g...
An explicit GIS-based river basin framework for aquatic ecosystem conservation ...
Venticinque, Eduardo Martins; Forsberg, Bruce Rider; Barthem, Ronaldo Borges; Petry, Paulo; Hess, Laura Lorraine; Mercado, Armando; Cañas, Carlos M.Despite large-scale infrastructure development, deforestation, mining and petroleum exploration in the Amazon Basin, relatively little attention has been paid to the management scale required for the protection of wetlands, fisheries and other aspects of aquatic ecosystems. This is due, in part, to the enormous size, multinational composition and interconnected nature of the Amazon River system, as well as to t...
Goliath catfish spawning in the far western Amazon confirmed by the distributio...
Barthem, Ronaldo Borges; Goulding, Michael; Leite, Rosseval Galdino; Cañas, Carlos M.; Forsberg, Bruce Rider; Venticinque, Eduardo Martins; Petry, PauloWe mapped the inferred long-distance migrations of four species of Amazonian goliath catfishes (Brachyplatystoma rousseauxii, B. platynemum, B. juruense and B. vaillantii) based on the presence of individuals with mature gonads and conducted statistical analysis of the expected long-distance downstream migrations of their larvae and juveniles. By linking the distribution of larval, juvenile and mature adult siz...
Ecosystem-based management of Amazon fisheries and wetlands
Goulding, Michael; Venticinque, Eduardo Martins; Ribeiro, Mauro Lde B.; Barthem, Ronaldo Borges; Leite, Rosseval Galdino; Forsberg, Bruce RiderInfrastructure development and overfishing in the Amazon make it imperative to define adequate scales for the ecosystem-based management of commercial fisheries and the wetlands on which they depend. We mapped fisheries and fish ecology data from Brazil, Peru, Bolivia and Colombia to an explicit GIS framework of river basins and mainstems. Migratory species account for more than 80% of the known maximum catches...
Redescription of Notarius grandicassis and Notarius parmocassis (Siluriformes; ...
Marceniuk, Alexandre P.; Siccha-Ramirez, Raquel [UNESP]; Barthem, Ronaldo Borges; Wosiacki, Wolmar BenjaminMade available in DSpace on 2018-12-11T16:45:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-05-04; Parkinson Research Foundation; The Thomas sea catfish is characterized by a highly variable parietosupraoccipital process, which has been recognized as intraspecific variation or phenotypic plasticity. On the basis of this variation, three nominal species have been described, with two of them currently ...
Ecologia e pesca da piramutaba (brachyplatystoma vaillantii)
Barthem, Ronaldo BorgesAgência 1; A piramutaba (Brachyplatystoma vaillantii),Pimelodidae) é a espécie de peixe mais importante dentre aquelas que são exportadas da Amazônia e foi a terceira em ordem de importância dos que foram exportadas do Brasil em 1987. Sua pesca ocorre principalmente no estuário e canal principal do rio Amazonas e é realizada por duas frotas pesqueiras distintas: artesanal e industrial. A pesca artesanal emprega...
Estudo do crescimento da pescada gó. (Macrodon ancylodon) capturada no estuário...
Pirker, Lilianne Esther Mergulhão; Barthem, Ronaldo BorgesEstudou-se o crescimento da pescada gó (Macrodon ancylodon) capturada pela pesca industrial 110 estuário ama zônico. A determinação da idade foi feita através da distribuição de freqüências por classes de comprimento. Os parâmetros de crescimento estimados foram: Loo = 40,53cm; k = 0,327 allo'e to = - 1,043 an os. O modelo de crescimento, utilizado no presente trabalho, foi o de von Berttalanfy, cuja equação qu...
Descrição da pesca da piramutaba (Brachyplatystoma Vaillantii. Pimelodidae) no ...
Barthem, Ronaldo BorgesRESUMO - A piramutuba (Brachyplatystoma vaillantü, Pímelodidae, Siluroidei) é a espécie de peixe mais importante das que são exportadas da Amazônia e foi a terceira em ordem econômica entre as exportadas pelo Brasil em 1987. Através de entrevistas e observações de campo foi possível descrever os barcos e aparelhos de pesca, o manuseio destes e a organização dos pescadores que pescam a piramutaba. Considerando...