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| Registros recuperados: 23 | |
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| SILVA,Nathália Carina dos Santos; COSTA,Aluízio José Lopes da; LOUVISE,José; SOARES,Bruno Eleres; REIS,Vanessa Cristine e Souza; ALBRECHT,Míriam Pilz; CARAMASCHI,Érica Pellegrini. |
| ABSTRACTResource partitioning is important for species coexistence. Species with similar ecomorphology are potential competitors, especially when phylogenetically close, due to niche conservatism. The aim of this study was to investigate the resource partitioning among populations of two species of lebiasinids (Copella nigrofasciata and Pyrrhulina aff. brevis) that co-occur in a first-order Amazonian stream, analyzing the trophic ecology, feeding strategies and ecomorphological attributes related to the use of food and space by these species. Fish were captured in May and September 2010. The stomach contents of 60 individuals were analyzed and quantified volumetrically to characterize the feeding ecology of both species. Eleven morphological attributes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feeding; Coexistence; Spatial segregation; Copella nigrofasciata; Pyrrhulina aff. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000100025 |
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| TORRENTE-VILARA,Gislene; CELLA-RIBEIRO,Ariana; HAUSER,Marília; RÖPKE,Cristhiana; FREITAS,Maria Helena; DORIA,Carolina Rodrigues da Costa; ZUANON,Jansen. |
| ABSTRACT Chalceus guaporensis is an endemic fish to the upper Madeira River whereas C. epakros is widespread in many rivers of the central and lower portions of the Amazon Basin, middle and upper Orinoco River Basin, the Essequibo River in Guyana and in the Nanay River in northern Peru. According to literature, both species do not occur in syntopy. We carried out ichthyological surveys along the Madeira River Basin and its rapids, and data on abundance, diet and habitat use were obtained for both species. Chalceus guaporensis and C. epakros are morphologically similar, occupying floodplain habitats and exploiting similar food resources. The former predominated upstream from the Jirau Fall, whereas the latter had most of its abundance bellow the last fall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alestidae; Coexistence; Biology; Geographical barrier; Muddy water. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300239 |
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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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| Alves, Gustavo Henrique Zaia; Universidade Estadual de Maringá; Tófoli, Raffael Marcos; Universidade Estadual de Maringá; Novakowski, Gisele Caroline; Universidade Estadual de Maringá; Hahn, Norma Segatti; UEM. |
| This study investigated the feeding habits of Serrapinnus microdon and S. calliurus and possible seasonal differences (rainy and dry seasons) in the utilization of food. The fish were collected monthly in Cancela stream, in the basin of the Manso/Cuiabá rivers in the State of Mato Grosso, from March 2003 to February 2004. Both species preferentially consumed resources of autochthonous origin, independently of the season. The diet of S. microdon was basically composed by immature forms of aquatic insects, with Chironomidae and Ephemeroptera predominating during the entire study period, thus showing a restricted diet (Ba = 0.27 in the rainy season, and 0.29 in the dry season). For S. calliurus, aquatic insects (especially Ephemeroptera) were equally... |
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Palavras-chave: Serrapinnus; Diet; Coexistence; Stream Serrapinnus; Diet; Coexistence; Stream. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7593 |
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| Pini,Suelen F. R.; Abelha,Milza C. F.; Kashiwaqui,Elaine A. L.; Delariva,Rosilene L.; Makrakis,Sergio; Makrakis,Maristela C.. |
| ABSTRACT Resource partitioning allows for interspecific coexistence and is frequently reported for similar species. Here, we predicted the existence of resource partitioning among species of Astyanax that co-occur in the Low Iguaçu River and tributaries in Brazil. A total of 848 stomachs of five species of Astyanax were analyzed. Algae, terrestrial plant and fruit/seed were the most consumed resources. Astyanax bifasciatus and A. dissimilis had predominantly herbivorous diets, A. gymnodontus and A. lacustris were omnivorous, and A. minor was mainly algivorous. Permutational analysis of variance showed the species had different diets, and similarity percentage analysis indicated that fruit/seed and terrestrial plant contributed the most to this... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coexistence; Congeneric species; Diet; Diet overlap; Niche theory. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500203 |
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| Corrêa,Carlos Eduardo; Albrecht,Miriam Pilz; Hahn,Norma Segatti. |
| Spatial and temporal variations in patterns of niche breadth and feeding overlap were investigated for the fish fauna in the Pantanal region, aiming to determine the factors that account for species coexistence. Samples were conducted in the Cuiabá River and Chacororé pond, in the upper Pantanal region, Mato Grosso State, Brazil, during one hydrological cycle (March 2000 to February 2001), (designed spatial-seasonal units). Mean niche breadth values were overall low for the fish assemblage (0.2-0.3). Differences between periods were not statistically significant. Feeding overlap values ranged between 0 and 0.4, whereas the mean was always inferior to 0.05 in all spatial-temporal units, and differences between periods were not statistically significant. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coexistence; Diet; Fishes; Floodplain; Pantanal. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300017 |
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| SILVA,A.A.P.; OLIVEIRA NETO,A.M.; GUERRA,N.; HELVIG,E.O.; MACIEL,C.D.G.. |
| ABSTRACT One of the factors that can influence soybeans yield is the interference imposed by weeds. This research has aimed to determine the critical period of weed interference on cv. INT 6100 RRTM soybeans. The experiment was conducted under field conditions at Campo Mourão County, Parana State, in the 2013/2014 harvest, using randomized blocks, arranged in a 2 x 8 factorial, with four replications. In the first factor, the coexistence (period before weed interference) and control (total period of weed interference prevention) periods were assessed. The second factor consisted of management times of weed species (0, 7, 14, 28, 35, 49, 56 and 130 days after emergence - DAE). The evaluations performed were density and shoot dry matter of the weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coexistence; Weed control; Competition; Glycine max. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400707 |
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| ULJOL,L.H.O.; BIANCO,S.; FILHO,A.B.C.; BIANCO,M.S.; CARVALHO,L.B.. |
| ABSTRACT: The objective of this work was to determine the interference periods of weeds of the bell pepper cultivar ‘Dahra’. Two experiments were conducted during the years 2014/15 (harvest with lower rainfall) and 2015/16 (harvest with higher rainfall). The treatments consisted of 11 growing periods of cohabitation and weed control with ‘Dahra’ bell peppers: 14, 28, 42, 56, 70, 84, 98, 112, 126, 140 and 154 days after transplanting (DAT). For the determination of the interference periods, the productivity data were analyze using the Boltzmann sigmoidal regression model. The main weeds were Eleusine indica, Brachiaria plantaginea, Digitaria nuda and Nicandra physaloides for presenting high biomass and relative density. The concomitance of these weeds... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum; Competition; Coexistence. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100247 |
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| Hirzinger, Tobias; Menrad, Klaus. |
| Seit der ersten Aussaat 1996 in den USA nimmt die Anbaufläche transgener Pflanzen jährlich stetig zu und 2005 wurden weltweit auf 90 Mio. ha transgene Pflanzen angebaut. In der EU wurden in den letzten Jahren umfangreiche gesetzliche Regelungen erlassen, welche die Zulassung, die Kennzeichnung und das Monitoring gentechnisch veränderter Organismen (GVO) regeln. In der vorliegenden Studie wurde untersucht, welche Konsequenzen der weltweite Anbau gentechnisch veränderter Pflanzen, unter Beachtung der europäischen Gentechnikgesetzgebung, für die Lebens- und Futtermittelindustrie in Deutschland hat. Empirische Grundlage ist eine umfassende schriftliche Befragung, die 2005 durchgeführt wurde. Das Ergebnis dieser Studie zeigt, dass vor allem Rohstoffimporte aus... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Genetic Modification; Law; Food; Feed; GMO; Coexistence; Labelling; Traceability; Food Consumption/Nutrition/Food Safety. |
| Ano: 2006 |
URL: http://purl.umn.edu/14964 |
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| Ceddia, M. Graziano; Bartlett, Mark; Perrings, Charles. |
| Pollen-mediated gene flow is one of the main concerns associated with the introduction of genetically modified (GM) crops, since growers of GM varieties normally do not take into account its possible impact on conventional and organic growers therefore generating negative externalities. Should a premium for non-GM varieties emerge on the market, 'contamination' with GM pollen would generate a revenue loss for growers of non-GM varieties. The existence of such externalities has led the European Union (EU) to put forward the concept of coexistence in order to guarantee farmers' freedom to plant both conventional and GM varieties without generating economic losses to conventional farmers. The first part of this paper develops a simple economic model analysing... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Coexistence; Pollen-mediated gene flow; Monte Carlo simulation; Crop Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/44193 |
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| Registros recuperados: 23 | |
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