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Registros recuperados: 9
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Consequences of suppressing natural vegetation in drainage areas for freshwater ecosystem conservation: considerations on the new "Brazilian forest code" Acta Botanica
Pinheiro,Marcelo Henrique Ongaro; Carvalho,Lucélia Nobre; Arruda,Rafael; Guilherme,Frederico Augusto Guimarães.
The input of particulate and dissolved organic matter (POM and DOM, respectively) from terrestrial ecosystem drainage basins is an important energy and nutrient source in limnic food chains. Studies indicated that semi-deciduous seasonal forests located in drainage areas in Brazil have the potential to produce 7.5 - 10.3 Mg ha−1/year of POM. The global increase in vegetation destruction, such as forests, threatens this allochthonous resource and can have significant impacts on river and lake communities and food chains. Therefore, it is critical that exploitation and occupation protocols are updated to protect the transition areas between terrestrial and limnic ecosystems. This review highlights the existing knowledge of these ecosystem interactions and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Freshwater biodiversity; Freshwater food chains; Freshwater resources; Riparian forests; Watershed.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200262
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Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems Acta Botanica
Arruda,Rafael; Fadini,Rodrigo Ferreira; Carvalho,Lucélia Nobre; Del-Claro,Kleber; Mourão,Fabiana Alves; Jacobi,Claudia Maria; Teodoro,Grazielle Sales; Berg,Eduardo van den; Caires,Claudenir Simões; Dettke,Greta Aline.
Mistletoes have been studied in temperate countries regularly because they can be pests of cultivated plants and forest plantations. In comparison with temperate habitats, little is known about the ecology of mistletoes in the Neotropics. More emphasis should be given to neotropical mistletoes because they could be important elements of plant communities, acting as key resources for pollinators, seed dispersers and herbivores. Using a combination of findings from early mistletoe studies and empirical evidence from several recent case studies, we report emerging patterns of mistletoe interactions with associated organisms and propose aims for further studies. There has been increasing interest in working with mistletoes in Brazil. Although there are some...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemiparasites; Biological conservation; Host specificity; Host compatibility.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200003
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Hêliconias como alternativa econômica para comunidades amazônicas Acta Amazonica
Arruda,Rafael; Carvalho,Vinícius Tadeu de; Andrade,Paulo César Machado; Pinto,Maria Goretti.
Reservas extrativistas (RESEX) são espaços territoriais destinados à exploração sustentável e conservação dos recursos naturais renováveis, por populações extrativistas. Além disso, tem como finalidade implantar alternativas de renda que contribuam para a melhoria das condições de vida das famílias locais. Dentre as variadas possibilidades de renda pelas comunidades que compõem as RESEX, destacamos neste trabalho o uso das helicônias. As espécies de Heliconia são um dos mais vistosos grupos de plantas herbáceas das florestas tropicais. Entretanto seu uso como fonte de renda é desconhecido pelas comunidades que compõem a RESEX. Registramos 11 espécies de Heliconia na RESEX do Baixo Juruá com uso potencial como plantas ornamentais: H. acuminata, H....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ervas de sub-bosque; Sustentabilidade; Conservação; Plantas ornamentais; RESEX.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000400003
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Host-parasite interactions between the piranha Pygocentrus nattereri (Characiformes: Characidae) and isopods and branchiurans (Crustacea) in the rio Araguaia basin, Brazil Neotropical Ichthyology
Carvalho,Lucélia Nobre; Arruda,Rafael; Del-Claro,Kleber.
In the tropics, studies on the ecology of host-parasite interactions are incipient and generally related to taxonomic aspects. The main objective of the present work was to analyze ecological aspects and identify the metazoan fauna of ectoparasites that infest the piranha, Pygocentrus nattereri. In May 2002, field samples were collected in the rio Araguaia basin, State of Goiás (Brazil). A total of 252 individuals of P. nattereri were caught with fishhooks and 32.14% were infested with ectoparasite crustaceans. The recorded ectoparasites were branchiurans, Argulus sp. and Dolops carvalhoi and the isopods Braga patagonica, Anphira branchialis and Asotana sp. The prevalence and mean intensity of branchiurans (16.6% and 1.5, respectively) and isopods (15.5%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Serrasalminae; Cymothoidae; Argulidae; Ectoparasitism; Amazon basin.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000200006
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New initiatives for Brazilian aquatic plant data management Acta Botanica
Pivari,Marco Otávio Dias; Melo,Pablo Hendrigo Alves de; Souza,Filipe Soares; Stehmann,João Renato; Moura Júnior,Edson Gomes de; Moreira,Suzana Neves; Pott,Vali Joana; Pott,Arnildo; Lopes,Aline; Moço,Maria Cecilia Chiara; Oliveira,Lukiel dos Santos; Lins,Alba Lucia de Almeida; Arruda,Rafael; Morais,Isa Lucia de; Silva,Gustavo Santos; Ferreira,Régis Moreira.
ABSTRACT Initiatives directed at managing information on aquatic plants can support different areas of scientific research, educational practices and political decisions for sustainable management and protection of wetlands and natural resources, as well as reveal knowledge gaps regarding aquatic plants and wetlands. Furthermore, such initiatives can contribute directly to consolidating wetland classification systems in Brazil. The objectives of this work are to present and explore the use of a data repository and online platform created specifically for the management of data on aquatic plants in Brazil. The data repository for aquatic plants was developed to store information on species occurrence records in a standardized form considering: systematics,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic macrophytes; Biodiversity conservation; Data platform; Data repository; Environmental variables; Wetland classification.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100078
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Rapid assessment of fruit-color selection by birds using artificial fruits at local scale in Central Amazonia Acta Amazonica
Arruda,Rafael; Rodrigues,Domingos J.; Izzo,Thiago J..
Modeling clays have been used in several ecological experiments and have proved to be an important tool to variables control. The objective of our study was to determine if fruit color in isolated and grouped displays influences the fruit selection by birds in the field using artificial fruits. Data were collected in six plots distributed homogeneously in 3 km long trails with a minimum distance of 0.5 km. We used a paired experimental design to establish our experiments, so that all treatments were available to the local bird community in each plot. Overall, red was more pecked than brown and white. Isolated red and brown displays were significantly more pecked than others display. Even though our study was conducted in small spatial scales, artificial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fruit color; Paired experimental design; Background foliage coloration; Contrast hypothesis.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000200011
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Record of cleaning behavior by Platydoras costatus (Siluriformes: Doradidae) in the Amazon Basin, Brazil Neotropical Ichthyology
Carvalho,Lucélia Nobre; Arruda,Rafael; Zuanon,Jansen.
Records of cleaning symbiosis between freshwater fish are scarce. Here we report on juvenile catfish, Platydoras costatus, cleaning the piscivorous characin Hoplias cf. malabaricus in a stream of the rio Araguaia drainage in the Brazilian Amazon. The scarcity of records on cleaning behavior in freshwater systems seems to be in part a consequence of the few observational studies under natural conditions in the Neotropics. Otherwise, the rareness of this behavior in freshwaters is possibly related to the short evolutionary time available to the fish fauna to develop these complex interactions, when compared to the ocean environment.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Erythrinidae; Hoplias cf. malabaricus; Piscivorous client; Juvenile cleaner; Rio Araguaia.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200009
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Second floor, please: the fish fauna of floating litter banks in Amazonian streams and rivers Neotropical Ichthyology
Carvalho,Lucélia Nobre; Fidelis,Luana; Arruda,Rafael; Galuch,André; Zuanon,Jansen.
Floating litter banks are an ephemeral habitat consisting of branches, twigs, flowers, seeds, and fruits that are trapped on the stream water surface by a variety of retention mechanisms. These heterogeneous materials form a deep layer of dead plant matter that is colonized by a variety of organisms, including fish that forage on the aquatic macroinvertebrates found in this unique habitat. In this study, we aimed to characterize which fish species occupy the floating litter banks and their trophic characteristics, as well as determine if fish assemblage composition and species richness can be predicted by the size of the floating litter banks. Fish sampling was conducted in five rivers located in the Amazon basin. Of the 31 floating litter banks sampled...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ephemeral habitats; Fish assemblages; Insectivores; Lotic systems; Trophic structure.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100085
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Two mistletoes are too many?: Interspecific occurrence of mistletoes on the same host tree Acta Botanica
Arruda,Rafael; Lunardelli,Caroline; Kitagawa,Clóvis; Caires,Claudenir Simões; Teodoro,Grazielle Sales; Mourão,Fabiana Alves.
Mistletoe can have a major impact on the fitness of the host plant. If there is more than one species of mistletoe on the same host tree, the overall impact might be amplified. We report the occurrence of more than one species of mistletoe on the same host tree. Although it is not a rule in the field, to our knowledge, there have been no studies of this topic. In most cases, two species of mistletoe were recorded on the same host tree, although we recorded three species of mistletoe on one occasion. This demonstrates that different species of mistletoe can be compatible with the same host species. Therefore, compatibility (structural and physiological) might be an important factor for the occurrence of mistletoe. Recent studies have shown that if the...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Parasite-host relationship; Compatibility; Specificity; Parasitic plants; Red Queen hypothesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100021
Registros recuperados: 9
Primeira ... 1 ... Última
 

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