Metazoan
Mostrando 1-12 de 355 artigos, teses e dissertações.
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1. Community structure of metazoan parasites in Hemibrycon surinamensis (Characidae) from the Matapi River in the State of Amapá, Brazil
Abstract Abstract: The aim of this study was to investigate the community of metazoan parasites in Hemibrycon surinamensis from the Matapi River, State of Amapá, Brazil. Among the 31 examined fish, 77.4 % were parasitized by Jainus hexops, Tereancistrum ornatus (Monogenea), Contracaecum sp. (Nematoda), Clinostomus marginatum and Posthodiplostomum sp. (Digen
An. Acad. Bras. Ciênc.. Publicado em: 01/07/2019
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2. Helminth parasites of Cichla ocellaris Bloch & Schneider, 1801 collected in the Jacaré-Pepira River, São Paulo state, Brazil
Abstract:Cichla ocellaris is native to the Amazon region. It is popularly known as tucunaré and is widely used for human consumption. It is difficult to breed in captivity due to its highly predatory habits, it is considered symbolic of sport fishing in Brazil. This study aimed to make a qualitative and quantitative survey of helminth parasites of C. ocella
An. Acad. Bras. Ciênc.. Publicado em: 13/05/2019
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3. Parasitic communities of Hoplosternum littorale (Hancock, 1828) as indicators of environmental impact
ABSTRACT The parasites are indicative of several biological aspects of their hosts, including their diet, migration, recruitment and phylogeny, but they can also be direct indicators of the environmental quality. Hoplosternum littorale is a fish that has a high commercial value in some South American countries. The fishes were collected from January to July
An. Acad. Bras. Ciênc.. Publicado em: 23/10/2017
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4. Community structure of metazoan parasites of silverside, Odontesthes bonariensis (Pisces, Atherinopsidae) from Argentina
The helminth communities of silverside, Odontesthes bonariensis (Valenciennes, 1835), from two Argentinean lagoons were studied and compared at component community and infracommunity levels. Nine helminth species were found: five digeneans (Austrodiplostomum cf. mordax, Ascocotyle (Phagicola) cf. diminuta, Ascocotyle sp., Thometrema bonariensis and Saccocoel
Iheringia. Série Zoologia. Publicado em: 2012-03
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5. A teoria da gastrea de Ernst Haeckel / The gastrea theory of Ernst Haeckel
The main goal of our work is to describe and critically analyze the core of the gastrea theory of Ernst Haeckel. It centers around two main notions: gastrula form and metazoan. The gastrea theory is a set of formulations designed to establish a definition of metazoan from the notion of gastrula form. The central argument of the gastrea theory articulates the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2011
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6. Parasitos metazoários de cetáceos da costa nordeste do Brasil. / Metazoan parasites of cetaceans of the northeast coast of Brazil.
Cetaceans are parasitized by a wide diversity of endo and ectoparasites in various tissues, organs and cavities. Some species are related to causes of strandings and mortality of dolphins and whales. In addition to knowledge about the pathological effects of these organisms, their importance in ecological and evolutionary studies is highlighted. The parasiti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2009
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7. Avaliação de metazoarios parasitos de Hoplias malabaricus (Bloch, 1794) (Pisces: Erythrinidae) como potenciais indicadores de qualidade ambiental / Assessment metazoan parasites of Hoplias malabaricus (Bloch, 1794) (Pisces: Erythrinidae) as potential indicators of environmental quality
Este estudo teve como objetivo a associação entre os índices hematológicos de Hoplias malabaricus (traíra), o parasitismo por monogeneas e outras espécies de metazoários e os fatores ambientais. O estudo ocorreu nas lagoas do CEPTA/ICMBio, localizada no município de Pirassununga, SP (21º55 55"S e 47º22 37"W), no período de fevereiro de 2008 a mar�
Publicado em: 2009
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8. Hipótese evolutiva sobre a assimilição de compostos nitrogenados por metazoários: a limitação α-aminoácidos / Evolutionary hypothesis on the nitrogenous compounds uptake by metazoan: the limitation to α-aminoacids
Metabolic pathway evolution models are molecular and computational based, and do not take account the physiological and ecological contexts in which organisms are inserted. Thus using the nitrogen metabolism as a platform, an evolutionary hypothesis on the α-amino acids utilization by metazoans was proposed. The objective of the present work is to trace
Publicado em: 2008
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9. DistribuiÃÃo espaÃo-temporal e taxonomia da famÃlia Oncholaimidae (Nematoda, Enoplida) no Talude da Bacia de Campos, Rio de Janeiro, Brasil
Nematoda represent about 80 to 99% of the total abundance of metazoan in deep sea, however, little research is carried out in this environment. The aim of this work is identify the specimens of the Family Oncholaimidae to the specific level, describe the new species and theirs distribution in a platform of the South West Atlantic. The samplings were performe
Publicado em: 2008
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10. Efeito do BÃrio e CÃdmio no desenvolvimento populacional de Pellioditis marina ( Bastian, 1865) ( Nematoda, Rhabtidae) e Diplollaimeloides oschei Meyl, 1954 ( Nematoda, Monhysteridae)
Oil and gas drilling activities usually involve the use of fluids that contain several heavymetals, among those, barium and cadmium, which can affect the biota from the surrounding area. Nematodes are the most abundant metazoan, and play an important role on the food web and in the carbon flux. The aim of this work was to analyze the population development o
Publicado em: 2008
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11. Phylogenetic position of Placozoa based on large subunit (LSU) and small subunit (SSU) rRNA genes
The phylum Placozoa, represented by its single species Trichoplax adhaerens, has always been considered one of the most basal animal clades due to its low morphological complexity. However, despite its importance, the phylogenetic position of the Placozoa remains uncertain, as does the relationships between the basal metazoans. We sequenced the nearly comple
Genetics and Molecular Biology. Publicado em: 2007
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12. A mitochondrial metazoan phylogeny / Uma filogenia mitocondrial de metazoários
Inferring the evolutive relations between the animal phyla has been a formidable challenge to Science. The animal phyla represent quite distinct baupläne (body architectures) and are, therefore, difficult to compare. At the same time, their fossil record converges mostly to the same period on the geological scale. The recent availability of molecular data h
Publicado em: 2007