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| Registros recuperados: 922 | |
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| SALA,Silvia Estela; DUQUE,Santiago R.; NÚÑEZ-AVELLANEDA,Marcela; LAMARO,Anabel Alejandra. |
| This research was carried out in three of the most important basins of the Colombian Amazon (Upper Solimões, Iça and Japurá Rivers). The creeks and lakes that were studied contain abundant diatom species, particularly those of the genus Eunotia. Ten species are described; five of them are registered for the first time in the Amazon basin, and six in all of Colombia. All taxa were photographed with scanning electron microscopy. Fine valve morphology of E. anamargariate, E. pseudoindica, E. triodon, and E. zydodon var. compacta is described for the first time. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diatoms; Eunotia; Distribution; Ecology; Colombian Amazon Basin. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672002000400589 |
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| Díaz,María Mónica; Nava,Santiago; Guglielmone,Alberto Alejandro. |
| In this work the infestation with I. luciae on Didelphimorphia and Rodentia in different environments of Peruvian Amazon was studied. Didelphimorphia was represented by the family Didelphidae. Specimens belonging to Caluromys lanatus, Didelphis marsupialis, Marmosops sp.2, Metachirus nudicaudatus, Philander andersoni and Philander opossum were infested with adults I. luciae and one Micoureus sp. was infested with larvae. In Rodentia, the infestation with I. luciae nymphs was restricted to Hylaeamys perenensis, Hylaeamys yunganus and Oligoryzomys microtis, while one Oecomys bicolor (all Cricetidae) was infested with larvae of this species. The few larvae were found on rodents captured in primary forest. The only significant difference (P < 0.05) in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ixodes luciae; Ecology; Didelphimorphia; Rodentia; Peruvian Amazon. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000400029 |
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| Ramos,Geraldo José Peixoto; Santana,Lucineide Maria; Medina,Anderson Matos; Bicudo,Carlos Eduardo de Mattos; Branco,Luis Henrique Zanini; Moura,Carlos Wallace do Nascimento. |
| ABSTRACT Knowledge of algal and cyanobacterial diversity of phytotelmata remains poorly-known, especially for bromeliads from different vegetation formations. We investigated the microalgae communities of four species of tank bromeliads from different vegetation formations in Bahia State, Northeast Brazil, highlighting the composition, richness and diversity of taxa. Sampling of water stored in bromeliads was carried out quarterly between 2014 and 2016, and abiotic variables and morphometric attributes of bromeliads were measured. A total of 89 taxa of algae and cyanobacteria were recorded for the four bromeliad species studied. The microalgae communities of the phytotelmata varied among vegetation formations, with one tank bromeliad, Alcantarea nahoumii,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Ecology; Microalgae; Microhabitat; Phytotelm; Richness; Tank bromeliads. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400567 |
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| Jesus,Priscila Barreto de; Pestana,Edilene Maria dos Santos; Affe,Helen Michelle de Jesus; Rocha,Diogo Souza Bezerra; Caires,Taiara Aguiar; Nunes,José Marcos de Castro; Schnadelbach,Alessandra Selbach. |
| ABSTRACT Hypnea pseudomusciformis was recently described from South America, and has three morphological variants: “musciformis”, “nigrescens”, and “valentiae”. Information on the biology of these variants may help to explain this species’ wide morphological variation despite the absence of genetic divergence among variants. More morphological and ecological data has accumulated on the “musciformis” variant occurring on the Brazilian coast than for the others. In this study, we described the reproductive morphology of a tropical “nigrescens” population and investigated its phenology to provide crucial biological information about this taxon, and perhaps also assist in answering questions about the systematics of H. pseudomusciformis variants. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Cystocloniaceae; Ecology; Hypnea musciformis complex; Reproduction; Systematics. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100067 |
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| Lima,Diogo Xavier; Souza-Motta,Cristina Maria; Lima,Catarina Letícia Ferreira de; Souza,Carlos Alberto Fragoso de; Ribeiro,Jonathan Ramos; Santiago,André Luiz Cabral Monteiro de Azevedo. |
| ABSTRACT As primary decomposers of organic matter, mucoralean fungi have an important ecological role in edaphic systems in the Atlantic Forest. However, there is a knowledge gap regarding how communities of Mucorales are structured in soils of Atlantic Forest areas, and whether these communities are influenced by edaphic attributes in this domain. Thus, the current study aimed to understand the influence of edaphic attributes linked to species richness, abundance and composition of Mucorales in dense ombrophilous forest, ‘tabuleiro’ forest, sandbank and mangrove ecosystems located in Pernambuco, Brazil. Altogether, twenty-three taxa, including seven new records, were reported from soil samples from the ecosystems. Species composition was similar among the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Basal fungal order; Diversity; Ecology; Mucorales; Mucoromycota; Mucoromycotina; Soil; Taxonomy. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400796 |
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| Engel, Eduardo; Pasini, Mauricio Paulo Batistella; Hörz, Daniele Caroline; Hesel, Aline; Barassuol, Daniel Rapachi; Chassot, Claudio Ariel. |
| Identifying the behavior of natural enemies during the crop offseason is a key tool for integrated pest management. The objective of this work was to evaluate the population density of natural enemies of the plants Chloris distichophylla, Andropogon bicornis, and Erianthus angustifolium and to analyze the influence of the structural complexity of these plants on the present population. During the offseasons of 2014, 2015, and 2016, 150 plants of each species were evaluated and subdivided into different clump diameters. The species Lycosa spp., Eriops connexa, Cicloneda sanguinea, Coleomegilla quadrifasciata, Lebia concinna, and Harmonia axyridis were identified. A. bicornis was the plant with the highest population density, followed by C. distichophylla... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Zea mays; Biological control; Ecology; Population dynamics. Ecologia de Insetos. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42479 |
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| Mormul, Roger Paulo; Universidade Estadual de Maringá - UEM; Padial, André Andrian; Universidade Federal de Goiás & Instituto Federal de Educação, Ciência e Tecnologia do Mato Grosso do Sul. |
| Fractals seemed to have permeated most scientific fields, including ecology. In fact, biodiversity and ecological processes are affected by spatial complexity, and fractals can help understand patterns at multiple scales. In this paper we evaluated the main quantitative trends and the profile of ecology publications using fractals. Publications about fractals in Ecology experienced a high increase in the last two decades, and most articles were published in highly visible ecology journals. However, studies were authored mainly by US scientists, and researchers from developing countries had a minor contribution. In addition, studies were highly biased towards terrestrial environments, and empirical approaches were preferred. |
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Palavras-chave: 2.05.00.00-9 Fractal geometry; Ecology; Spatial complexity; Scientometrics Ecologia fractal geometry; Ecology; Spatial complexity; Scientometrics Ecologia. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7701 |
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| Moreira, Luís Henrique de Aquino; UEM; Yamada, Fábio Hideki; UEM; Ceschini, Tiago Lopes; UEM; Takemoto, Ricardo Massato; UEM; Pavanelli, Gilberto Cezar; UEM. |
| The study analyzed 84 specimens of Metynnis lippincottianus (Cope, 1870) (Characidae) from two environments with different degrees of impact due to a hydroeletric plant; 44 hosts from the upper Parana river floodplain (low degree of impact) and 40 from Paranapanema tributaries (Corvo and Guairacá rivers, high degree of impact). The prevalence found, among the total collected fishes, was 77.4%. One digenetic species, Dadayus pacupeva, and four nematodes, Spinoxyuris oxydoras, Contracaecum sp. (larval stage), Procamallanus (Spirocamallanus) inopinatus and Raphidascaris (Sprentascaris) mahnerti were identified. In the floodplain, the fishes parasitized by D. pacupeva and S. oxydoras presented better relative condition factor (Kn) than non-parasitized species.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecology; Parasites; Nematode; Digenetic; Hydroelectric plants ecology; Parasites; Nematode; Digenetic; Hydroelectric plants Parasitologia. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/3668 |
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| García-Mateos,Rosario; Soto-Hernández,Marcos; Zavala-Chávez,Fernando; Kite,Geofrey. |
| Abstract The purpose of this study was to compare the alkaloid profile in different tissues analyzed by GC/MS and to contribute to the ecological knowledge of Calia secundiflora (patol). Samples of leaves, root and seeds of patol (mescal bean) were collected and field information was recorded in the States of Hidalgo and Querétaro, México, using the point-centered quarted method. Species dominance was calculated (value of importance) and the two locations were compared in species richness, similarity index, and soil data. Seventeen species of plants were found in Hidalgo and 21 in Querétaro; Flourensia resinosa and patol dominated the vegetation in Hidalgo, while patol and Dodonaea viscosa dominated in Querétaro. The profile of the quinolizidine alkaloids... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dodonaea viscosa; Flourensia resinosa; Ecology; Fabaceae; Habitat; Toxicity. |
| Ano: 2007 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952007000200161 |
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| Sánchez,Begoña; Prado,José Luis; Alberdi,María Teresa. |
| To reconstruct the diet and habitat preference of fossil horses, we measured the carbon and oxygen isotope composition of 35 bone and tooth samples of Equus (Amerhippus) neogeus Lund, Hippidion principale (Lund), and Hippidion devillei (Gervais) from 10 different Pleistocene localities in the Pampean region (Argentina). To compare the three species by stratigraphic age, we divided the samples into three groups: lower Pleistocene, middle-late Pleistocene and latest Pleistocene. Samples of Hippidion devillei from the lower Pleistocene were more homogeneous, with δ13C values ranging between -11.73 to -9.79‰. These data indicate a diet exclusively dominated by C3 plants. In contrast, Hippidion principale and Equus (Amerhippus) neogeus from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equus (Amerhippus); Hippidion; Paleodiet; Ecology; Extinction; Pleistocene; Papean region; South America. |
| Ano: 2006 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200012 |
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| GAMA,MICHELLINY M. BENTES; VIEIRA,ABADIO H.; ROCHA,RODRIGO B.. |
| The aim of this study was to characterize the forest structure with H. flexuosa in Rondônia State, as a first step in developing sustainable harvest and conservation guidelines for the species. Crown attributes, total height (m) and diameter at breast height ≥ 10 (cm) of trees and palms with H. flexuosa were evaluated in three permanent plots (100 m x 150 m each) randomized in 219 ha. A total of 22 botanical families hosted H. flexuosa. It was not observed any specific preference for the species standing up itself. Nevertheless it was frequently associated to Burseraceae, Leguminosae, Sapotaceae, Annonaceae, Chrysobalanaceae, Apocynaceae, Moraceae and Myristicaceae and species with thick bark like Schweilera coriacea, Protium sp. and Licania membranaceae.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Non-timber forest product; Ecology; Plant fibers; Habitat preference; Multiple-use forest management. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301117 |
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| JANUÁRIO,FELIPE F.; GIÃO,THAYANA; AZEVEDO,RODNEY K. DE; ABDALLAH,VANESSA D.. |
| 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. ocellaris. Thirty specimens from the Jacaré-Pepira River, located in the municipality of Ibitinga, in the interior of the state of São Paulo, were studied. The river is located 13 km from the urban area and at an altitude of approximately 600 m. A total of four taxa of metazoan parasites were collected and identified in Cestoda, Digenea, Monogenea and Nematoda. The cestoid Proteocephalus macrophallus presented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecology; Parasitic fauna; Tucunaré; Fish parasites. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300608 |
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| Cordero,Rodrigo León; Torchelsen,Fábio P.; Overbeck,Gerhard E.; Anand,Madhur. |
| The occurrence of Scotch broom Cytisus scoparius (L.) Link (Fabaceae), is reported for the first time in Brazil. The species has been registered in the species-rich Campos Sulinos grasslands, in the Campos de Cima da Serra, and in the Serra do Sudeste. Naturalizing populations were frequently formed in natural habitats near to human settlements, where prevailing land uses and disturbances facilitate dispersal and establishment. The plant is an invasive species that has globally caused significant damage to biodiversity and economic losses. In Brazil, the species has a strong potential for spreading into a wide range of ecosystems. The Atlantic Forest biome and part of the Pampa biome, together known as the Campos Sulinos, represent optimal areas for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alien species; Early detection; Ecology; Grassland; Scotch broom. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100149 |
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| Registros recuperados: 922 | |
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