oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir
Silva, Eduardo Carvalho;Molozzi, Joseline;Callisto, Marcos;
Zoologia (Curitiba) , 2010, DOI: 10.1590/S1984-46702010000500004
Abstract: this study evaluated the relationships of certain allometric measurements in melanoides tuberculatus muller, 1774, in order to develop a statistical model to estimate the biomass of this mollusc species. we measured the total length and aperture of 70 shells. these measurements were correlated with the biomass values to construct exponential and power-function models, and both models showed high coefficients of determination. the exponential model was the better biomass predictor, with a coefficient of determination over 93%. these proposed models may be an effective tool to determine the biomass of m. tuberculatus in eutrophic brazilian reservoirs.
First record of the invasive snail Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) in the Paran? River basin, GO, Brazil
Rocha-Miranda, F.;Martins-Silva, M. J.;
Brazilian Journal of Biology , 2006, DOI: 10.1590/S1519-69842006000600018
Abstract: the thiarid snail melanoides tuberculatus (müller, 1774), native to asia and east africa was recorded for the first time in the paran? river basin, goiás state. there is no evidence concerning introduction vectors but aquarium releases is the most probable vector. specimens were collected at three different water bodies after twenty-seven rivers were investigated. the possible spread of this species to other habitats and potential effects on native thermal water communities are discussed.
Melanoides tuberculatus (Gastropoda: Thiaridae) as intermediate host of Heterophyidae (Trematoda: Digenea) in Rio de Janeiro metropolitan area, Brazil
Bogéa, Tami;Cordeiro, Fernanda Martins;Gouveia, Janaína Silva de;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2005, DOI: 10.1590/S0036-46652005000200005
Abstract: in the late 1960s, melanoides tuberculatus snails were introduced in brazil from north/east africa and southeast asia. the first records of specimens infected with cercariae were registered in rio de janeiro state in 2001. the present study reports the occurrence of m. tuberculatus infected with larval trematodes in rio de janeiro city. bottom sediment was collected with dip nets and sieved through 0.25 inch-mesh screening. snails were transported to the laboratory in vials with stream water, then measured and individually isolated in glass vials with distilled water. they were exposed to artificial light and temperature to induce cercarial emergence. the most actively emerging cercariae were processed by differential staining and silver nitrate impregnation methods. negative snails were subsequently dissected. approximately 700 snails were collected. snail total lengths ranged from 1.2 to 3.3 cm. the prevalence rate was 15.76% although 53.76% of the snails were found infected in one of the sites. infected snails were infected with rediae and pleurolophocercous cercariae. cercarial morphology and chaetotaxy were consistent with those of the family heterophyidae mostly due to the presence of median dorsal and ventral fins on the tail and the absence of ci dorsal sensory receptors.
Riesgo de establecimiento del gasterópodo dulceacuícola invasor Melanoides tuberculatus (Thiaridae) en el Río de la Plata (Argentina-Uruguay) Colonization risks of the invading freshwater gastropod Melanoides tuberculatus (Thiaridae) in Río de la Plata (Argentina-Uruguay)  [cached]
Diego E. Gutiérrez-Gregoric,Roberto E. Vogler
Revista mexicana de biodiversidad , 2010,
Abstract: Melanoides tuberculatus es un gasterópodo cosmopolita que ha invadido y se ha establecido en casi todos los países del continente americano, desconociéndose en la mayoría de los casos el origen de su introducción. En este trabajo se menciona el riesgo de establecimiento de esta especie en áreas de influencia del Río de la Plata como consecuencia de su registro en acuarios de la ciudad de La Plata (Buenos Aires, Argentina) dedicados a la venta de flora y fauna limnética. A principios de 2009, la especie fue identificada a partir de 26 ejemplares procedentes de un comercio, siendo éste el registro más austral de la especie para una localidad de la cuenca del Plata. Revisiones posteriores en 3 locales comerciales de la ciudad confirmaron la presencia de la especie en 2 de ellos. Dicha presencia se relacionó con la adquisición de plantas ornamentales por parte de los establecimientos. La identificación del gasterópodo en la ciudad de La Plata debe considerarse cuidadosamente, debido a las posibles consecuencias que tendría la liberación accidental de este molusco en el Río de la Plata en lo relacionado con el desplazamiento de fauna local y salud pública. Melanoides tuberculatus is a cosmopolitan gastropod that has invaded and has now spread into most countries of the American continent. Introduction pathways remain unknown in most cases. This work draws attention on the colonization risks of this species in the Río de la Plata area as a consequence of its record in flower and pet shops - in the city of La Plata (Buenos Aires, Argentina) - in which limnic species are sold. The species was identified at the beginning of 2009 within a lot of 29 specimens from a shop, and this is the southernmost record of this species in the Plata Basin. Subsequent surveys in 3 commercial shops in the same city revealed its presence in 2 of them. This was related to the purchase of ornamental plants by the shops. Identification of this species in the city of La Plata should be carefully assessed, because of the potential consequences that settlement of this mollusk in the Río de la Plata may have on displacement of the local fauna and on public health.
Riesgo de establecimiento del gasterópodo dulceacuícola invasor Melanoides tuberculatus (Thiaridae) en el Río de la Plata (Argentina-Uruguay)
Gutiérrez-Gregoric, Diego E.;Vogler, Roberto E.;
Revista mexicana de biodiversidad , 2010,
Abstract: melanoides tuberculatus is a cosmopolitan gastropod that has invaded and has now spread into most countries of the american continent. introduction pathways remain unknown in most cases. this work draws attention on the colonization risks of this species in the río de la plata area as a consequence of its record in flower and pet shops - in the city of la plata (buenos aires, argentina) - in which limnic species are sold. the species was identified at the beginning of 2009 within a lot of 29 specimens from a shop, and this is the southernmost record of this species in the plata basin. subsequent surveys in 3 commercial shops in the same city revealed its presence in 2 of them. this was related to the purchase of ornamental plants by the shops. identification of this species in the city of la plata should be carefully assessed, because of the potential consequences that settlement of this mollusk in the río de la plata may have on displacement of the local fauna and on public health.
Habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail Melanoides tuberculatus (Müller, 1774)
Giovanelli, Alexandre;Silva, Cesar Luiz Pinto Ayres Coelho da;Leal, Geórgia Borges Eccard;Baptista, Darcílio Fernandes;
Memórias do Instituto Oswaldo Cruz , 2005, DOI: 10.1590/S0074-02762005000200010
Abstract: our objective is to evaluate the habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail melanoides tuberculatus. in the first phase, snails was collected at 12 sites. this sampling sites presented a degree of organic input. in the second phase 33 sampling sites were chosen, covering a variety of lotic and lentic environments. the snail species found at guapimirim, state of rio de janeiro, displayed a marked habitat preference, specially in relation to the physical characteristics of each environment. other limiting factors for snail distribution at the studied lotic environments were the water current velocity and the amount of organic matter, mainly to physa marmorata, m. tuberculatus, and biomphalaria tenagophila. the absence of interactions between m. tuberculatus and another snails could be associated to the distinct spatial distribution of those species and the instability of habitats. this later factor may favor the coexistence of m. tuberculatus with b. glabrata by reduction of population density. in areas of schistosomiasis transmission some habitat modification may add to the instability of the environment, which would make room for the coexistence of m. tuberculatus and biomphalaria spp. in this way, some of the usual measures for the control of snail hosts would prevent the extinction of populations of biomphalaria spp. by m. tuberculatus in particular habitats.
Estrutura da Comunidade de Invertebrados Bent nicos do Rio Piranhas-Assu, Rio Grande do Norte, Nordeste do Brasil  [cached]
Herbet Tadeu de Almeida Andrade,Alexandre S. Santiago,Jansen Fernandes Medeiros
EntomoBrasilis , 2008,
Abstract: Esse trabalho teve como objetivo conhecer os invertebrados bent nicos, bem como caracterizar os grupos tróficos funcionais existentes no rio Piranhas-Assu, município de Alto do Rodrigues, Rio Grande do Norte. As coletas foram realizadas nos meses de maio (chuva), julho e setembro (seca) de 2002, em trechos diferentes do rio. Foi medida a velocidade da correnteza, a largura, profundidade do rio e temperatura da água. Foram coletados 3525 indivíduos de Insecta e outras classes (Malacostraca, Gastropoda, Bivalvia, Arachnida, Ostracoda e Copepoda). A maior abundancia da classe Insecta ocorreu no mês de setembro (seca). A vaz o apresentou correla o com a abundancia com na Classe Insecta, já a velocidade superficial da água para outras classes. Entre os Insecta observou-se uma maior abundancia de predadores, seguida dos coletores, já para as outras classes os raspadores foram mais abundantes.Structure of benthic invertebrate’s community with focus in the aquatic insects of the Piranhas-Assu river, State of Rio Grande do Norte, Northeast, BrazilAbstract. The aim of this work was to verify the benthonic invertebrates, and to identify the functional trophic groups that exist in the Piranhas-Assu, in Alto do Rodrigues municipality, Rio Grande do Norte State. The samples were carried taken on May (rain season), July and September (dry season) from 2002, in different sites in the river. The measurements of water speed, wide, temperature and river deep where made. It was collected 3525 individuals of Insecta and other classes (Malacostraca, Gastropoda, Bivalvia, Arachnida, Ostracoda and Copepoda). Insecta showed a higher abundance in September (dry season). The river discharge showed significant correlation with Insecta classe abundance, and the superficial water speed had correlation with other classes. The insects showed a highest abundance of predators, followed by collectors, in the other classes, the scrappers were the most abundant.
LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE) EN MEDELLíN, COLOMBIA  [cached]
VERGARA DANIELA,VELáSQUEZ LUZ ELENA
Acta Biológica Colombiana , 2009,
Abstract: RESUMEN Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae), molusco dulceacuícola del que se colectaron 125 especímenes en el lago del Jardín Botánico Joaquín Antonio Uribe de Medellín. En el laboratorio se individualizaron y se estimuló la emisión cercariana con una fuente luminosa. El 9,6 % de los caracoles emitió cercarias. Los moluscos emisores se sacrificaron para obtener los demás estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfológicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae) y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, así como la especificidad de los filoftálmidos por moluscos hospedadores de la superfamilia Cerithioidea. Palabras claves: cercarias, digenea, Melanoides tuberculata, Philophthalmidae, Redias. ABSTRACT The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae) are described. 125 snails from the Medellina€ s Botanical Garden Joaquín Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae) was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed. Key words: Cercariae, Digenea, Melanoides tuberculata, Philophthalmidae, Rediae.
First record of Melanoides tuberculatus (Müller, 1774) and Biomphalaria tenagophila (d´Orbigny, 1835) on Ilha Grande, Rio de Janeiro, Brazil
Santos, Sonia Barbosa dos;Miyahira, Igor Christo;Lacerda, Luiz Eduardo Macedo de;
Biota Neotropica , 2007, DOI: 10.1590/S1676-06032007000300037
Abstract: small populations of melanoides tuberculatus (müller, 1774) and biomphalaria tenagophila (d′orbigny, 1835), were found at vila do abra?o, being the first record of these species to ilha grande, angra dos reis, rio de janeiro. they were probably introduced after 2004, perhaps following release from aquaria. the possible spread of these species to other freshwater habitats in the island, their effects on native snails and links with public health are discussed. the record of m. tuberculatus appears to be the first for a brazilian insular area. the recent introduction of these species offers a remarkable opportunity to monitor introduced species and to understand the invasion process in an insular stream in southeastern brazil.
LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE) EN MEDELLíN, COLOMBIA
VERGARA,DANIELA; VELáSQUEZ,LUZ ELENA;
Acta Biológica Colombiana , 2009,
Abstract: the larvae of two trematodes found in the freshwater mollusk melanoides tuberculata (gastropoda: thiaridae) are described. 125 snails from the medellin’s botanical garden joaquín antonio uribe were collected. in the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. these were separated in three morphologies. from each one, 15 individuals were measured and drawn. photographs were taken. based on their morphological characteritics the presence of centrocestus formosanus (heterophyidae) was determined. the other two morphologies were classified in the family philophthalmidae. one of them constitutes the first register for colombia. the sensibility of m. tuberculata to infections by digeneans, and the specificity of the family philophthalmidae to mollusk hosts of the superfamily cerithioidea are confirmed
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.