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| Registros recuperados: 23 | |
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| Abelha,Milza Celi Fedatto; Goulart,Erivelto; Kashiwaqui,Elaine Antoniassi Luiz; Silva,Marlene Rodrigues da. |
| Aspects of the feeding ecology of a small characin, Astyanax paranae, were studied during 1996/1997 and 1998/1999 in the Alagados Reservoir, Paraná, Brazil (25º01'50.0'' S; 050º03'41.9'' W). Fishes were quarterly captured from the reservoir's riverine and lacustrine zones and stomachs contents of 711 adult individuals were analyzed by volumetric method. Species' feeding spectrum and spatial, temporal and sexual variations on diet were evaluated. Data matrix was summarized by detrented correspondence analysis (DCA) and the axes scores from DCA were used as variables in one-way ANOVA of null models to test diet variations. Astyanax paranae fed on detritus/sediment, plant matter, algae and aquatic and terrestrial invertebrates. The time-space prevalence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Feeding; Dam; Detritivory; Freshwater. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000300006 |
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| Sant´Ana,Léa S.; Iwamoto,Adriane A.; Crepaldi,Daniel V.; Boaventura,Túlio P.; Teixeira,Lilian V.; Teixeira,Edgar A.; Luz,Ronald K.. |
| ABSTRACT Lophiosilurus alexandri is a carnivorous freshwater fish endemic of São Francisco basin and an endangered species. In this study, we analysed the chemical composition (moisture, protein, ash and lipid), fatty acid profile, and nutritional quality (atherogenic index, thrombogenecity index, ratio between hypocholesterolemic and hypercholesterolemic fatty acids and ω6/ω3 = ratio) of L. alexandri in lotic (river), lentic (hydroelectric dams) environments, under natural fed, and in laboratory controlled conditions fed with commercial diets. Cultured and lentic fish had significantly higher lipid levels (1.5 and 1.9- fold, respectively) than lotic fish. Lentic L. alexandri had significantly higher eicosapentaenoic acid (EPA) levels (4×) than cultured or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Feeding; Lipids; Pacamã; Ω3. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500211 |
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| Burns,Marcelo D. M.; Garcia,Alexandre M.; Vieira,João P.; Bemvenuti,Marlise A.; Marques,David M. L. Motta; Condini,Vinicius. |
| The communication between the Patos and Mirim lagoon systems occurs via a natural channel called São Gonçalo. In 1977, a dam was built in this channel to prevent entrance of saline waters from Patos Lagoon estuary into the Mirim Lagoon. Our results showed an abrupt discontinuity in salinity and fish species distribution along the study sites. Sites below the dam showed salinity values higher than zero, whereas sites above had zero salinity values across all sampling periods. Marine and estuarine fishes (e.g., mullets Mugil platanus, M. curema, silversides Odontesthes argentinensis, Atherinella brasiliensis, sardine Brevoortia pectinata, and white croaker Micropogonias furnieri) were not captured above the dam. If these juvenile fishes could enter the Mirim... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish migration; Artisanal fishery; Estuary. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100006 |
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| Ortega Baltazar, Edgar. |
| Es poco conocido el comportamiento reproductivo de las principales razas de conejo en México aunque se cuenta con información proveniente del Centro Nacional de Cunicultura. Se estudio el tamaño total de la camada al nacimiento (TTCN), tamaño de la camada viva al nacimiento (TCVN), intervalo interparto (II), tamaño de la camada al destete (TCD), peso de la camada al destete (PCD) y el peso medio del gazapo al destete (PMD) de hembras Nueva Zelanda (NZ), California (CL) y Chinchilla (CH) utilizando un modelo estadístico mixto que incluyo los efectos de raza, coneja y año-estación de parto. Se utilizaron 8,162 registros reproductivos. Se definieron 18 épocas año-estación de parto, agrupadas trimestralmente de Diciembre de 2005 a Julio de 2010. Los datos... |
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Palavras-chave: Reproducción; Coneja; Centro nacional de cunicultura; Reproduction; Dam; National cuniculture center; Maestría; Ganadería. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/728 |
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| Cabral,Márcia M. M.; Zuanon,Jansen; de Mattos,Gália E.; Rosas,Fernando C. W.. |
| This study aimed to identify the diet of giant otters, Pteronura brasiliensis (Zimmermann, 1780) in the Balbina reservoir (01º55'S, 59º29'W), to compare it with literature data on the diet of giant otters from non-dammed areas, and to verify the effects of the seasonal changes in water levels on the feeding habits of Balbina otters. A total of 254 feces samples were collected and identified according to the lowest possible taxonomic level. Teleostei fish were present in 100% of the samples; two samples also presented monkey fur (n = 1) and sloth fur (n = 1), suggesting that the diet of P. brasiliensis, in the reservoir, is almost exclusively based on fish. Ten fish families were identified in our samples, six of which were exclusive to the Balbina Lake... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon basin; Aquatic mammal; Conservation; Dam; Diet. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000100008 |
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| Pelicice,Fernando Mayer; Azevedo-Santos,Valter M.; Esguícero,André Luiz Henríques; Agostinho,Angelo Antonio; Arcifa,Marlene Sofia. |
| ABSTRACT The Paranapanema River is a major tributary of the upper Paraná river basin. Eleven hydropower dams regulate its main course, but no study has investigated fish diversity in these impoundments at the basin-scale. The present study investigated spatial patterns of richness, composition, and abundance of native (non-migratory and migratory) and non-native fishes in the cascade of reservoirs along the Paranapanema River. The study is based on data collected from 34 independent studies conducted in nine reservoirs (47 samples). The compilation recorded 161 species, being 111 native (14 migratory) and 50 non-native. Total richness ranged between 56 and 112 species/reservoir, with a mean of 72 (49.9 non-migratory, 8.1 migratory and 14 non-native). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish fauna; Longitudinal; Migratory fish; Non-native. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000200213 |
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| Agostinho,Angelo Antonio; Agostinho,Carlos Sergio; Pelicice,Fernando Mayer; Marques,Elineide Eugênio. |
| Fish ladders are a strategy for conserving biodiversity, as they can provide connectivity between fragmented habitats and reduce predation on shoals that accumulate immediately below dams. Although the impact of predation downstream of reservoirs has been investigated, especially in juvenile salmonids during their downstream movements, nothing is known about predation on Neotropical fish in the attraction and containment areas commonly found in translocation facilities. This study analysed predation in a fish passage system at the Lajeado Dam on the Tocantins River in Brazil. The abundance, distribution, and the permanence (time spent) of large predatory fish along the ladder, the injuries imposed by piranhas during passage and the presence of other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish migration; Fish pass; Piscivores; Serrasalmus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400001 |
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| Lira,Nibelle A.; Pompeu,Paulo S.; Agostinho,Carlos S.; Agostinho,Angelo A.; Arcifa,Marlene Sofia; Pelicice,Fernando M.. |
| ABSTRACT River regulation has fragmented fluvial ecosystems in South America, affecting fish migration and dispersion dynamics. In response, authorities have installed fish passage facilities (FPF) to mitigate impacts. However, little is known about the geographical distribution of these facilities, and no synthesis of the research effort applied to understanding their functioning and limitations exists. To address this issue, our study gathered the available scientific literature about fishways in South America to provide an overview of studied FPF and associated research effort. We found 80 studies that investigated 25 FPF, mostly ladders installed in the upper reaches of large rivers, particularly in the Paraná River Basin. One important finding is that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Dam; Fishway; Impact; Management. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200217 |
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| Mori,Edson S; Martins,Dagoberto; Velini,Edivaldo D; Marino,Celso L; Gouvêa,Cantídio F; Leite,Suzi M.M; Camacho,Edwin; Guries,Raymond P. |
| The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria. Large, dense populations of Egeria now grow in Jupiá Lake and its tributaries, occasionally blocking hydroelectric turbines. This study is part of a larger project examining environmental changes associated with large dam projects; the research objective of this study was to assess patterns of genetic diversity in Egeria populations growing in Jupiá and Três Irmãos Lakes and their Paraná River tributaries using genetic markers. Forty-two plants of E. najas and... |
| Tipo: Journal article |
Palavras-chave: Egeria; Dam; Isoenzyme; Genetic distance; RAPD; Reservoir. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200008 |
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| Santos,Alex Braz Iacone; Terra,Bianca de Freitas; Araújo,Francisco Gerson. |
| Changes in fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil reservoir were studied to detect distribution patterns and the seasonal influence of the inflowing river. Fish were caught by gill nets in three zones (riverine, transition and lentic) during two seasons (dry and wet). A total of 3,721 individuals were captured, comprising five orders, 14 families, 27 genera and 33 species. Five species were non-native and amounted to 17.7% of the total number of individuals. The 10 most abundant species were used to assess spatial-temporal patterns. Plagioscion squamosissimus (Heckel, 1840), Oligosarcus hepsetus (Curvier, 1829) and Metynnis maculatus (Kner, 1858) were widely distributed in both seasons. Astyanax... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish diversity; Paraíba do Sul River; Seasonality. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500010 |
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| Marcondes,Carlos Brisola; Fernandes,Aristides; Müller,Gerson Azulim. |
| Anopheline and other mosquitoes (Diptera: Culicidae) in the southern Brazilian State of Santa Catarina have been studied mostly near the Atlantic sea coast and are not well known in other regions of the state. Collections were made near a reservoir in the western portion of the state. At least 26 species were represented in the collections; 10 are recorded for the first time for the state: Coquillettidia venezuelensis, Cq. juxtamansonia, Mansonia wilsoni, Ochlerotatus fluviatilis, Psorophora ciliata, Ps. discrucians, Ps. lanei, Culex bigoti, Sabethes belisarioi and Sa. identicus, and 12 for the first time in the western portion of the state: Anopheles albitarsis, An. intermedius, An. lutzi, An. parvus, An. strodei, Chagasia fajardi, Cx. quinquefasciatus,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Culicidae; Santa Catarina; Brazil; Anopheles; Psorophora; Reservoir; Dam. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000300014 |
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| Zaganini, Rosangela Lopes; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Vidotto-Magnoni, Ana Paula; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Carvalho, Edmir Daniel; Universidade Estadual Paulista “Júlio de Mesquita Filho”. |
| The Nile Tilapia, Oreochromis niloticus, and the Congo Tilapia, Tilapia rendalli, are important members of the African cichlids, and have been introduced to many Brazilian lakes and reservoirs. These species exhibit a large feeding flexibility and may modify their habits during their growth. In the Barra Bonita reservoir, these species are well adapted, representing more than 80% of fish. This study aimed to analyze ontogenetic variation with regard to the diet of these species in this important reservoir. Samples were taken monthly, from March 2007 to February 2008, in Anhembi, São Paulo State. Both species were analyzed by grouping individuals according to size classes. The coexistence of these species was observed in this environment, to which fish were... |
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Palavras-chave: 2.05.00.00-9 cichlids; Coexistence; Dam; Fish feeding; Paraná river basin Ecologia. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/9971 |
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| Araya,Patricia R.; Agostinho,Angelo A.; Bechara,José A.. |
| The population structure and dynamics of Leporinus acutidens (Valenciennes, 1837), upstream from Yacyretá Dam (Upper Paraná River, Argentina) were analyzed for their relation to age, condition factor, growth, mortality and fishery yield. The pre- (1990-94) and post- (1995-98) filling phases of the reservoir were compared with regard to age structure, condition factor, and the length/weight relationship of fish. Fish sampling was carried out at four sampling sites following a longitudinal gradient along the river. The catches took place monthly using eight monofilament gillnets (mesh 40 to 160 mm). The growth marks on the scales were annual (9-year maximum). The study of the variation in the monthly averages of the scale marginal increments revealed that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Age; Mortality; Dam; Paraná River. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100007 |
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| Gonçalves,Inês Corrêa; Cid,Bruno; Mortati,Amanda Frederico; Quesado,Letícia Barbosa; Nessimian,Jorge Luiz. |
| Physical environment of streams present many challenging factors to the organisms living under its influence. Water speed, one of the most important factors affecting such environments, has local influence on substrata, temperature, and oxygen levels. It acts determining species distributions and morphological and behavioral adaptations of organisms. The aim of this study was to assess the relative size of gills of Cloeodes jaragua on two mesohabitats: lentic environment (river dam) and lotic environment (fast flowing area of a stream) in Parque Nacional da Serra dos Órgãos (RJ, Brazil). Twenty individuals were collected on each environment and width of the head and gills were taken. Lentic environment showed nymphs with broader and more constant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ephemeroptera; Aquatic insects; Dam; Stream; Gills relative size; Water speed. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200022 |
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| Magalhães,André L. B. de; Ratton,Thiago F.. |
| The reproductive biology of the introduced pumpkinseed sunfish Lepomis gibbosus (Linnaeus, 1758) in the Custódio's Dam, rio Doce high basin, state of Minas Gerais, Brazil was studied from February/2001 to March/2002 and compared with introduced and native populations. Reproduction occurred almost along the entire period of study with a high frequency of fishes in the advanced ripening/mature and spawned/spent stages. The microscopic analyses indicated that the pumpkinseed sunfish presents multiple spawning. The egg diameter of the Brazilian population is similar to the Spanish, Greek and American ones. The standard length at maturity and the gonadosomatic index of the introduced populations are smaller when compared with native ones. The spawning season of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Dam; Exotic species; Rio Doce; Spawning. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000200025 |
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| Registros recuperados: 23 | |
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