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| Registros recuperados: 66 | |
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| Ferreira,Leandro V.; Neckel-Oliveira,Selvino; Galatti,Ulisses; Fáveri,Sarita B.; Parolin,Pia. |
| Construction of hydroelectric dams in tropical regions has been contributing significantly to forest fragmentation. Alterations at edges of forest fragments impact plant communities that suffer increases in tree damage and dead, and decreases in seedling recruitment. This study aimed to test the core-area model in a fragmented landscape caused by construction of a hydroelectric power plant in the Brazilian Amazon. We studied variations in forest structure between the margin and interiors of 17 islands of 8-100 hectares in the Tucuruí dam reservoir, in two plots (30 and >100m from the margin) per island. Mean tree density, basal area, seedling density and forest cover did not significantly differ between marginal and interior island plots. Also, no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Core-area model; Forest edges; Fragmentation; Hydroelectric dams. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000200006 |
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| OLIVEIRA-JUNIOR,José Max Barbosa de; ALMEIDA,Sara Miranda; RODRIGUES,Lucirene; SILVÉRIO JÚNIOR,Ailton Jacinto; ANJOS-SILVA,Evandson José dos. |
| This paper presents information about the species richness and abundance of orchid bees in the transitional area between the Cerrado and the Amazon Forest in the Xingu river basin. The males were collected in a forest fragment in the municipality of Ribeirão Cascalheira, northeast Mato Grosso state, Brazil, between 1 and 5 November 2011. Benzyl benzoate, 1.8 cineole, eugenol and vanillin were used as baits, to attract the bees using insect nets and methyl salicylate was used only in the bottle traps. A total of 168 males belonged to four of five Euglossini genera distributed among 16 species were recorded. The greatest species richness was registered in the genus Euglossa, however Eulaema nigrita, was the most abundant Euglossine species in the community.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attraction efficiency; Baits; Brazil; Fragmentation; Pollinators. |
| Ano: 2015 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000300005 |
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| Trzeciak-Limeira,Flavia; Pinto,Daniela Dias; Mourão,Káthia Socorro Mathias. |
| It is known that the efficient dispersal is one among other features that amplify the invasion potential of a plant. Knowledge of the ontogeny, morphology and fruit dispersal of species is indispensable for weed control in crops. To identify the pericarp structures involved in the fragmentation and dehiscence processes and other features related to dispersal, we studied the pericarp development of Aeschynomene evenia Wright, Desmodium incanum (Sw.) DC. and Vigna luteola (Jacq.) Benth. (Fabaceae-Faboideae), all of which are considered weeds in certain situations. For light and scanning electron microscopy studies, we fixed and processed buds, flowers and fruits, according to usual methods, at different stages of development. We observed that the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dehiscence; Fragmentation; Legume; Leguminosae; Loment. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400011 |
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| Lopes, Marta Custodio; Silva, Geuza Cantanhede da; Antunes, Nicanor Tiago Bueno. |
| Insects are important environmental bioindicators, due to the species diversity and wide range of habitats occupied. The present study evaluated the temporal variation in composition and abundance of soil insects in an urban forest fragment in the municipality of Toledo, in the state of Paraná, by analyzing their abundance and seasonality. Monthly samplings were conducted between August 2011 and July 2012 at four sampling sites within the fragment. At each site, three pitfall traps remained exposed for 48 hours. Captured insects were fixed in alcohol, sorted and identified. Throughout the study period, we captured 11,568 insects from 11 orders and 35 families. Coleoptera was the richest order (12 families), followed by Diptera and Hemiptera (5),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.04.00.00-4; 2.04.06.01-0 soil insects; Fragmentation; Survey; Pitfall Zoologia. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/24758 |
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| FIGUEIREDO,GUILHERME DE T.; STORTI,LUIS FERNANDO; LOURENÇO-DE-MORAES,RICARDO; SHIBATTA,OSCAR A.; ANJOS,LUIZ DOS. |
| Abstract: Environmental heterogeneity is a factor which can help explain the higher local species richness. The objective of this study was to test if richness and composition of anurans species are related to available microhabitats and landscape type of sampled sites. We assume that a higher number of microhabitats increase environmental heterogeneity and this, in turn, affects species richness of amphibians. We performed the study in the Mesophytic Semideciduous Forest, a vegetation type within Atlantic Forest Domain. Between October 2010 and February 2011, we sampled 23 water bodies located in the agricultural, forest, and urban landscapes. The species richness was determined using survey at breeding sites methodology, and the availability of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amphibians; Anthropic actions; Biodiversity; Fragmentation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300615 |
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| RODRIGUES,BRUNO V.B.; AGUIAR-NETO,MANOEL B.; OLIVEIRA,UBIRAJARA DE; SANTOS,ADALBERTO J.; BRESCOVIT,ANTONIO D.; MARTÍNS,MARLÚCIA B.; BONALDO,ALEXANDRE B.. |
| ABSTRACT A list of spider species is presented for the Belém Area of Endemism, the most threatened region in the Amazon Basin, comprising portions of eastern State of Pará and western State of Maranhão, Brazil. The data are based both on records from the taxonomic and biodiversity survey literature and on scientific collection databases. A total of 319 identified species were recorded, with 318 occurring in Pará and only 22 in Maranhão. About 80% of species are recorded at the vicinities of the city of Belém, indicating that sampling effort have been strongly biased. To identify potentially high-diversity areas, discounting the effect of variations in sampling effort, the residues of a linear regression between the number of records and number of species... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Araneae; Diversity; Fragmentation. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401543 |
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| Mallmann,Ivanete Teresinha; Silva,Vinícius Leão da; Schmitt,Jairo Lizandro. |
| Abstract: The Araucaria Forest is a unique plant formation, practically restricted to the Atlantic Forest biome, in the South and Southeast of Brazil. It is immensely fragmented and its area is reduced to a minimum fraction, from 13 to 2% of the original area, due to intense anthropic exploitation. Our study evaluated the richness and floristic composition of ferns and lycophytes within three Araucaria forest fragments, in Rio Grande do Sul, Brazil. For the floristic inventory, a parcel of 1 ha (100x100m) was demarcated inside three fragments, which were classified by size: large (246 ha - H1LF), medium (57 ha - H2MF) and small (5.2 ha - H3SF). Occurring species life forms and preferential substrates up to 4 meters above ground were recorded. In total, 55... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mixed Ombrophilous Forest; Fragmentation; Seedless vascular plants; Floristic inventory. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400302 |
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| Barbosa-Filho,Waldemar Guimarães; Araujo,Andréa Cardoso de. |
| Hummingbirds are the main vertebrate pollinators in the Neotropics, but little is known about the interactions between hummingbirds and flowers in areas of Cerrado. This paper aims to describe the interactions between flowering plants (ornithophilous and non-ornithophilous species) and hummingbirds in an urban Cerrado remnant. For this purpose, we investigated which plant species are visited by hummingbirds, which hummingbird species occur in the area, their visiting frequency and behavior, their role as legitimate or illegitimate visitors, as well as the number of agonistic interactions among these visitors. Sampling was conducted throughout 18 months along a track located in an urban fragment of Cerrado vegetation in Campo Grande, Mato Grosso do Sul,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agonistic behavior; Fragmentation; Ornithophily; Pollination. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400021 |
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| Pereira,Thamires Almeida; Passos,Paula de Oliveira; Santos,Lidiane Alves dos; Lücking,Robert; Cáceres,Marcela Eugenia Da Silva. |
| Abstract In the frame of an ongoing lichen inventory of Atlantic Rainforest remnants in Northeast Brazil, five new species of Graphidaceae were discovered in a small forest fragment, Mata do Cipó, in Sergipe state, the smallest state of Brazil and among those with the highest deforestation rate in the country. An additional new species had already been collected in Panama before and was now also found in the Mata do Cipó and is described here as well. In total, 40 species of Graphidaceae are reported for this remnant, including a large number of taxa indicative of well-preserved rainforest. The new species are: Fissurina atlantica T.A. Pereira, M. Cáceres & Lücking, sp. nov., Graphis subaltamirensis Passos, M. Cáceres & Lücking, sp. nov.,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Deforestation; Fragmentation; Lichen diversity; Graphidaceae; Refugia; Sergipe. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000100212 |
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| Rocha,Ednaldo Cândido; Silva,Jhefferson; Silva,Pablo Timóteo da; Araújo,Márcio da Silva; Castro,André Luis da Silva. |
| Abstract: The reduction and fragmentation of remnant vegetation habitats has been one of the main threats to Cerrado biodiversity. The aim of the present study is to make an inventory of medium and large mammal species in a Cerrado remnant and to assess deforestation influence on part of this fragment on the richness and composition of mammal species. The study was conducted in a Cerrado fragment in southeast Goias State, Ipameri County. Data were collected during three different periods (P1, January-June, 2014; P2, December, 2016 - June, 2017; P3, July-December, 2017) through direct (visual, vocal and camera-trap records) and indirect methods (foot prints, animal burrows and other traces) in order to register the mammal species. Jackknife 1 estimator was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mammal fauna; Wildlife survey; Species composition; Fragmentation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000300309 |
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| Ramos,Flavio Nunes; Santos,Flavio Antonio Maës. |
| The aim of this work was to investigate whether (i) the organisms within different fragments, on regional scale (separated by up to 100 km), could be submitted to similar climatic conditions (rainfall and temperature), and whether (ii) the edge formation in forest fragments could stimulate microclimatic changes (canopy cover, air temperature and soil humidity), on local scale. The organisms within different fragments, on regional scale, were submitted to different climatic conditions, and the edge formation in the forest fragment stimulated microclimatic changes, on local scale, although in a heterogenic way. Not just the distance from the edge influenced the microclimatic differences. Probably, the edge age, location, the matrix structure, as well as, gap... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic forest; Canopy openness; Edges; Fragmentation; Soil moisture; Temperature. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700011 |
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| CHIARELLO,A. G.. |
| A survey of mammals and birds was carried out in a semi-deciduous forest fragment of 150 ha located in a zone of intensive agriculture in Ribeirão Preto, State of São Paulo, south-eastern Brazil. Line transect sampling was used to census mammals and birds during six days, totalling 27.8 km of trails and 27.8 hours of observation. Twenty mammal species were confirmed in the area (except bats and small mammals), including rare or endangered species, such as the mountain lion (Puma concolor), the maned wolf (Chrysocyon brachyurus), and the ocelot (Leopardus pardalis). The brown capuchin monkey (Cebus apella) and the black-tufted-ear marmoset (Callithrix penicillata) were found frequently, suggesting high population density in the fragment. Regarding the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avifauna; Conservation; Fragmentation; Mammals; São Paulo. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200007 |
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| Petitpas,Robert; Ibarra,José Tomás; Miranda,Marcelo; Bonacic,Cristián. |
| R. Petitpas, J.T. Ibarra, M. Miranda, and C. Bonacic. 2016. Spatial patterns in a 24-year period show a case of increase forest cover and decrease fragmentation in Andean temperate landscapes, Chile. Cien. Inv. Agr. 43(3):384-395. Changes in landscape pattern were studied in a temperate landscape of the La Araucanía Region, Chile. Using aerial photographs from 1983 and 2007, we created land use/land cover maps. We then quantified the changes in composition and configuration by using landscape metrics and an adjacency matrix. By 2007, the dominant land cover had changed from agriculture to native vegetation. Residential areas showed the largest relative increase (670%) and had significant adjacency with native vegetation. The native vegetation increased by... |
| Tipo: Journal article |
Palavras-chave: Fragmentation; Landscape change; Native vegetation recovery; Temperate forest. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300004 |
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| Registros recuperados: 66 | |
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