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| Registros recuperados: 1.256 | |
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| Agostinho, Carlos Sérgio; UFT; Marques, Elineide Eugenio; Universidade do Tocantins. |
| The frequency of attacks by piranhas on specimens of netted fish was analyzed from monthly catches in gill nets set out for 24 hours and checked every 8 hours, from June 1987 through May 1988, in lakes, channels, and rivers of the upper Paraná river floodplain, Brazil. Captured fish were identified and marks of attack by piranhas on their fins and flesh were recorded. The probability of detection of netted fishes, their body structure, and behavioral aspects were the factors determining the selective piranhas attacks. There was no significant relationship between the frequency of predator attacks and the relative abundance of the prey. Community composition was the main factor determining the attack frequency, which differed according to environment |
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Palavras-chave: 2.00.00.00-6 Ciências Biológicas Serrasalmus spilopleura; Serrasalmus marginatus; Serrasalmidae; Piranha; Seleção de presa; Predação 2.00.00.00-6 Ciências Biológicas. |
| Ano: 2001 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2700 |
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| Paes, João Paulo Pereira; Lima, Victor Luiz Souza; Pratisolli, Dirceu; Carvalho, José Romário de; Bueno, Regiane Cristina Oliveira de Freitas. |
| The European pepper moth Duponchelia fovealis (Zeller, 1847) (Lepidoptera: Crambidae), despite being among the principal pests of strawberries in Brazil. However, biological control methods are rarely documented for this pest. In the current study, the goal was to select promising Trichogramma strains to enable the control of D. fovealis and to determine the acceptance of different ages of host eggs by the parasitoid. In the first bioassay, evaluations were done on the biological parameters of five strains of Trichogramma pretiosum Riley and one of Trichogramma galloi Zucchi (Hymenoptera: Trichogrammatidae). The best performance came from the strains, Tp18 (T. pretiosum) and Tg (T. galloi), showing parasitism and viability higher than 50 and 90%,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological control; Egg parasitoid; Parasitism percentage; European pepper moth; Host age.. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/42216 |
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| Marques, Nandeyara Ribeiro; UEM; Hayashi, Carmino; UEM; Galdioli, Eliana Maria; UEM; Fernandes, Carlos Eduardo Bento; UEM. |
| Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus) e curimba (Prochilodus lineatus) com diferentes idades (6, 12, 19 e 26 dias), na presença e ausência de Pistia stratiotes. Foram utilizados quatro tratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba) e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendo coletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram... |
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Palavras-chave: 2.05.00.00-9 Ecologia larvas de peixe; Piaractus mesopotamicus; Prochilodus lineatus; Seletividade alimentar; Plâncton. |
| Ano: 2007 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/523 |
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| Garcia, Raycon Roberto Freitas; Vasconcelos, Ana Carina Nogueira; Povh, Jayme Aparecido; Ribeiro, Janessa Sampaio de Abreu; Eloy, Lidiane Raquel; Streit Junior, Danilo Pedro. |
| The migratory species piabanha does not reproduce in lentic environments since it requires environmental stimuli for the maturation and extrusion of gametes, and therefore hormonal induction is mandatory. Current study compares the seminal characteristics of Brycon insignis without any hormonal induction (Control - Ctrl) and with two types of hormonal inductors, or rather, carp pituitary extract (T1 - 2.5 mg kg-1 body weight) and GnRH analogues, the latter applied in two different concentrations (T2 - 0.7 mg kg-1 body weight and T3 - 1.4 mg kg-1 body weight). Post-induction analyses showed that the hormones increased the motility rate - Ctrl (95%), T1 (100%), T2 (100%) and T3 (98%),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquicultura; Piscicultura; Reprodução de Peixes; Brycon insignis; Carp pituitary extract; GnRH analogues; Sperm. Zootecnia e Recursos Pesqueiros. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/28647 |
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| Silva, Adilson Ferreira; Cruz, Claudinei da; Garlich, Nathalia; Cerveira Junior, Wilson Roberto; Pitelli, Robinson Antonio. |
| The aim of this research was to evaluate the feasibility for the use of the organisms Lemna minor, Azolla caroliniana, Hyphessobrycon eques, Pomacea canaliculata and Daphnia magna as exposure bioindicators for ethanol (lethal and effective concentration 50% - LC50(I)/EC50(I)). Thus, the following concentrations were used 5.0; 10.0; 20.0; 30.0; 40.0 and 50.0 mg L-1 ethanol on L. minor; 25.0; 50.0; 75.0; 100.0; 150.0 and 200.0 mg L-1 on A. caroliniana; 0.3; 0.5; 1.0; 2.0 and 3.0 mg L-1 on H. eques; 0.05; 0.10; 0.20; 0.40 and 0.80 mg L-1 on P. canaliculata; and 40.0; 60.0; 80.0; 100.0; 120.0 and 140.0 mg L-1 on D. magna. An untreated control was also kept for all organisms, with three... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos pesqueiros e pesca environmental impact; LC50; Ecology ecotoxicologia sentinel organisms environmental impact ecology Ecotoxicologia. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/28946 |
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| Ferreira, Laerte Guimarães; UFG/Goiás; Ferreira, Nilson Clementino; UFG/Goiás; Ferreira, Manuel Eduardo; UFG/Goiás. |
| Levantamentos sistemáticos da cobertura vegetal no Brasil, à escala de semidetalhe, incluem aqueles realizados no âmbito dos projetos Radam e Radambrasil, no período de 1971 a 1977, tendo por base imagens de radar aerotransportadas e, mais recentemente, os mapeamentos, com base em imagens Landsat 7 ETM+, dos remanescentes da cobertura vegetal nos biomas brasileiros (projeto MMA/PROBIO), concluídos em 2006. Nestes pouco mais de 30 anos, muitas mudanças ocorreram, tanto na cobertura vegetal do país quanto no sensoriamento remoto orbital. Neste artigo de revisão, apresentamos, do ponto de vista conceitual e tecnológico, a evolução e o estado-da-arte dos sistemas sensores e discutimos algumas das técnicas mais utilizadas para decodificar (ex. em parâmetros... |
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Palavras-chave: Sensoriamento remoto da vegetação; Sistemas sensores; Monitoramento dos biomas brasileiros. remote sensing vegetation; Sensor systems; Monitoring brazilian biomes.. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5868 |
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| Souza, João Paulo; Melo, Nayara Magry Jesus; Halfeld, Alessandro Dias; Reis, Jéssica Naiara. |
| Enterolobium contortisiliquum occurs in native forests formations from southeast to northeast Brazil, and too in Argentina, Bolivia and Paraguay. The objective of this study was to evaluate shading effects in the early growth of E. contortisiliquum plants. We measured leaf gas exchange, chlorophyll content index, biomass allocation and leaf development in plants in sunny and shaded areas. The experiment was performed in Universidade Federal de Viçosa, campus Florestal, Minas Gerais, Brazil. To determine the effects of different light regimes (full sunlight and shade) on the growth of E. contortisiliquum plants, we divided plants into two groups: plants grown in a greenhouse under full sunlight, and plants grown under 70% shade tissue. E. contortisiliquum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.05.00.00-9 leaf area; Leaf development; Maximum net photosynthesis. Ecologia Vegetal. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/33400 |
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| Bini, Luis Mauricio; UFG; Diniz Filho, José Alexandre Felizola; UFG; Bastos, Rogerio Pereira; UFG; Souza, Marcia Christianne de; UFG; Peixoto, Josana de Castro; UFG; Rangel, Thiago Fernando L. Valle de Britto; UFG. |
| O padrão de ocorrência temporal de 15 espécies de anfíbios que coexistem em uma unidade de conservação brasileira foi estudado de junho de 1995 a maio de 1998. Utilizando a matriz de dados binários, uma matriz de associação interespecífica (coeficiente de Jaccard) foi calcudala. Como uma única assembléia local foi temporalmente monitorada, esta matriz demonstra como os pares de espécies estão temporalmente associados (sincronia interespecífica). Duas matrizes explanatórias, uma baseada nas relações taxonômicas entre as espécies e a outra baseada nas características reprodutivas das espécies foram também analisadas. Os testes de Mantel indicaram que a matriz de sincronia interespecífica foi significativamente relacionada com a matriz de taxonomia, mas não... |
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Palavras-chave: 2.01.00.00-0 Biologia Geral assembléia de anfíbios; Sincronia interespecífica; Cerrado 2.01.00.00-0 Biologia Geral. |
| Ano: 2003 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2114 |
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| López, Cristiane Machado; CODEVASF; Sampaio, Edson Vieira; CODEVASF. |
| O objetivo deste trabalho foi avaliar o efeito de três densidades na estocagem larval do pacamã, com relação à sobrevivência e crescimento. O experimento foi realizado em 12 canaletas de 0,43m2, contando com três tratamentos e quatro repetições: 150 larvas/canaleta (tratamento 01), 250 larvas/canaleta (tratamento 02) e 500 larvas/canaleta (tratamento 03), as quais foram alimentadas com zooplâncton, quantificadas e medidas. Os tratamentos apresentaram os seguintes resultados quanto ao percentual de sobrevivência: 01 - 60%, 02 - 49%, e 03 - 37%. O teste-não paramétrico de significância “Wilcoxon’s Sum of Rank Test” demonstrou diferença estatisticamente significativa entre os tratamentos 01 e 03 (P < 0,05). Quanto ao comprimento total das larvas e às... |
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Palavras-chave: 2.00.00.00-6 Ciências Biológicas pacamã; Larvicultura; Densidade de estocagem; Sobrevivência; Alimentação 2.00.00.00-6 Ciências Biológicas. |
| Ano: 2000 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2934 |
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| Freitas, Welington Kiffer de; Portz, Adriano; Peres, Afonso Aurélio de Carvalho; Tarré, Ricardo Martinez; Campos, Matheus de Melo. |
| This study aimed to evaluate soil fertility and the horizontal structure of three demonstration units of Agroforestry Systems (ASs), Sapucaia, RJ, Brazil. Twenty-four plots (25 m2) were delineated in each AS. Soil fertility was evaluated through pH, organic carbon, total nitrogen, phosphorus and potassium. The estimated phytosociological parameters were frequency, density, dominance, importance value and the diversity index of Shannon. Magnesium was more pronounced in ASas with more management intensity due to the incorporation of banana biomass (AS 1 and 2). The AS 1 highlights were for banana and coffee (about 45% IV), AS 2 banana and physic nuts (about 50% IV) and AS 3 cassava and ‘fumo-bravo’ (VI=52.2%). This study... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.03.00.00-0 vegetation horizontal structure; Soil fertility; Family farming. Ecologia. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/35368 |
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| Klein, Ricardo Pablo; Somavilla, Alexandre; Köhler, Andreas; Cademartori, Cristina Vargas; Forneck, Eduardo Dias. |
| Wasps, important agents for the control of insect population, have been scantily studied in the Brazilian State of Rio Grande do Sul. Current study investigates monthly variations of social wasps in microhabitats within a forest-agriculture mosaic. Samples were collected between February 2013 and February 2014, through active search and baited traps made from 2 L transparent PET bottles, in five microhabitats, namely, forest, monoculture, polyculture and the edges between the forest fragment and monoculture and polyculture, in the municipality of Doutor Maurício Cardoso. Statistical tests, similarity indices, dominance and constancy as well as PCoA were used for data analysis to group the collection. A total of 953 specimens were collected, distributed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.05.02.00-1 forest fragment; Landscape; Northwest; Pesticides; Polyculture; Seasons.. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/27853 |
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| Almeida-Ferreira, Giovanna Caputo; Cesumar; Oliveira, Alessandra Valéria de; CESUMAR; Prioli, Alberto José; UEM; Prioli, Sônia Maria Alves Pinto; UEM. |
| The introduction of exotic species in lake ecosystems has been greatly highlighted in the literature worldwide. Since introduction may threaten diversity of native fish, the issue turns up to be of paramount importance. Ecological effects may be predation, competition, parasitism or genetic, that is, changes in the genetic pool of populations owing to the occurrence of hybrids. Although the Tucunaré fish (Cichla) is native to the Amazon region, it can be found in other hydrographic basins in which it has been introduced. RAPD molecular marker research showed that there are two species (Cichla kelberi and C. piquiti) belonging to the genus Cichla in the rivers of the Paraná basin. Different morphotypes in the region may also be due to hybridization. Current... |
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Palavras-chave: 2.02.00.00-5 Hybridization; Fish introduction; Molecular markers Genética Hybridization; Fish introduction; Molecular markers. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/4855 |
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| Moreti, Lívia Oliveira Ruiz; Universidade Estadual de Maringá; Martos, Luana; Universidade Estadual de Maringá; Bovo-Scomparin, Vânia Mara; Universidade Estadual de Maringá; Rodrigues, Luzia Cleide; Universidade Estadual de Maringá. |
| Along the horizontal axis of reservoirs are generally recognized three zones (fluvial, transition and lacustrine) with distinct hydrodynamic and physical, chemical and biological properties. Quarterly samplings were conducted in 2002, in the limnetic region from each zone, at different depths of a tropical reservoir. To test the hypothesis that highest biomass (biovolume) of phytoplankton are found in the transition zone, the PERMANOVA analysis was realized. 106 taxa were recorded. Significant differences between biovolume values of the three zones were not verified (pseudo F = 0,89; p = 0,55). Higher values of biomass were obtained in lacustrine and transition zones of the reservoir. The functional group (FG) N (Cosmarium spp.) was dominant in these... |
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Palavras-chave: 2.05.02.00-1 functional group; Biovolume; Horizontal distribution; Oligotrophic reservoir 2.03.00.00-0. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/12998 |
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| Rodrigues, Leon Maximiliano; Universidade Estadual do Norte Fluminense; Schwarzbold, Albano; Universidade Federal do Rio Grande Sul; Oliveira, Maria Angélica; Universidade Federal de Santa Maria. |
| The present study examined the behavior of a reservoir located on subtropical latitude (Dona Francisca reservoir). The limnological variables measured were dissolved oxygen, temperature, pH and electric conductivity. Measurements were taken quarterly at different sampling sites along the reservoir. The results indicated the formation of longitudinal zones regarding circulation patterns and stratification, beyond the influence from the water masses of the main tributary. The vertical profiles were obtained. The behavior of the reservoir is similar to others previously studied in the country, but with shorter time-lag stratification and a narrower range, possibly due to the shorter residence time of the water, and to the latitude, where summer is shorter. |
| Tipo: Comportamento e tipologia de reservatórios |
Palavras-chave: 2.05.02.00-1 subtropical reservoir; Thermal stratification; Compartmentalization; Thermocline Ecologia de Ecossistemas. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/10078 |
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| Registros recuperados: 1.256 | |
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