Consulta: subjectFacets:"Forest fragmentation"
Registros recuperados: 40
Data/hora: 07/06/2024 00:46:28

MAPEAMENTO DO USO DO SOLO COM DADOS DO SENSOR ASTER PARA DELIMITAÇÃO DE FRAGMENTOS FLORESTAIS
Provedor de dados: 25
Autores: Horikoshi, Andréa Sanae; Batista, Getulio Teixeira; Catelani, Celso de Souza; Fisch, Gilberto Fernando.
Resumo. O processo histórico de ocupação e transformação do espaço geográfico na região sudeste do Brasil, numa área denominada Alto Vale do Paraíba no Estado de São Paulo, deixou como legado um modelo de uso da terra baseado no desmatamento e na fragmentação florestal. Atualmente essa fragmentação está aumentando numa curva crescente e contínua devido aos efeitos do crescimento populacional dos centros regionais próximos. Isso fomenta o aumento da procura por propriedades situadas na zona rural e, conseqüentemente, geram pressões econômicas e especulação imobiliária que determinam significativas mudanças na distribuição fundiária da região. Vários estudos investigaram os efeitos da fragmentação florestal em regiões e áreas diferentes. Entretanto, esses...
Tipo: Article
Palavras-chave: Fragmento Florestal; Uso da terra; Atlantic Forest; Land use; Thermal remote sensing; ASTER sensor; Forest fragmentation; Sensoriamento remoto.
Ano: 2006
URL: http://hdl.handle.net/2315/49

Winter Responses of Forest Birds to Habitat Corridors and Gaps
Provedor de dados: 7
Autores: St. Clair, Colleen Cassady; University of Alberta; cstclair@ualberta.ca; Hannon, Susan; University of Alberta; Sue.Hannon@ualberta.ca.
Forest fragmentation and habitat loss may disrupt the movement or dispersal of forest-dwelling birds. Despite much interest in the severity of these effects and ways of mitigating them, little is known about actual movement patterns in different habitat types. We studied the movement of wintering resident birds, lured by playbacks of mobbing calls, to compare the willingness of forest birds to travel various distances in continuous forest, along narrow corridors (fencerows), and across gaps in forest cover. We also quantified the willingness of Black-capped Chickadees (Poecile atricapillus) to cross gaps when alternative forested detour routes were available. All species were less likely to respond to the calls as distance increased to 200 m, although...
Tipo: Peer-Reviewed Reports
Palavras-chave: Black-capped Chickadee; Corridor; Detour trials; Dispersal; Downy Woodpecker; Forest fragmentation; Gap width; Hairy Woodpecker; Movement; Poecile atricapillus; Picoides pubescens; Picoides villosus; Sitta carolinensis; White-breasted Nuthatch.
Ano: 1998

Use of Road Maps in National Assessments of Forest Fragmentation in the United States
Provedor de dados: 7
Autores: Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James; U.S. Environmental Protection Agency; wickham.james@epamail.epa.gov; Coulston, John; North Carolina State University; jcoulston@fs.fed.us.
The question of incorporating road maps into U.S. national assessments of forest fragmentation has been a contentious issue, but there has not been a comparative national analysis to inform the debate. Using data and indices from previous national assessments, we compared fragmentation as calculated from high-resolution land-cover maps alone (Method 1) and after superimposing detailed road maps (Method 2). There was more overall fragmentation with Method 2. However, because roads were often adjacent to other nonforest land cover, Method 1 typically detected &amp;gt; 80% of the forest edge and &amp;gt; 88% of the fragmentation of core, i.e., intact, forest that was detected by Method 2. Indices based on individual patch size changed much more for Method 2;...
Tipo: Peer-Reviewed Reports
Palavras-chave: United States; Ecological assessments; Land-cover maps; Landscape patterns; Road maps; Forest fragmentation.
Ano: 2004

Distribution and Causes of Global Forest Fragmentation
Provedor de dados: 7
Autores: Wade, Timothy G; U.S. Environmental Protection Agency, National Exposure Research Laboratory; wade.timothy@epa.gov; Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James D; U.S. Environmental Protection Agency, National Exposure Research Laboratory; wickham.james@epa.gov; Jones, K. Bruce; U.S. Environmental Protection Agency, National Exposure Research Laboratory; jones.bruce@epa.gov.
Because human land uses tend to expand over time, forests that share a high proportion of their borders with anthropogenic uses are at higher risk of further degradation than forests that share a high proportion of their borders with non-forest, natural land cover (e.g., wetland). Using 1-km advanced very high  resolution radiometer (AVHRR) satellite-based land cover, we present a method to separate forest fragmentation into natural and anthropogenic components, and report results for all inhabited continents summarized by World Wildlife Fund biomes. Globally, over half of the temperate broadleaf and mixed forest biome and nearly one quarter of the tropical rainforest biome have been fragmented or removed by humans, as opposed to only 4% of the boreal...
Tipo: Peer-Reviewed Reports
Palavras-chave: Forest fragmentation; Forest pattern; Global; Risk assessment; Targeting.
Ano: 2003

The Trade-off Between Housing Density and Sprawl Area: Minimizing Impacts to Carabid Beetles (Coleoptera: Carabidae)
Provedor de dados: 7
Autores: Fahrig, Lenore; ; lenore_fahrig@carleton.ca.
Increasing housing density has negative effects on native biodiversity. This implies that we should build at low density to conserve native species. However, for a given human population, low-density development must cover a large area, resulting in sprawl. A pertinent question is then, at what housing density are the impacts of a given human population on native biodiversity minimized? We addressed this question with carabid beetles in Ottawa and Gatineau, Canada. First, we collected beetles at 22 sites representing a range of housing densities. We then used these data to estimate beetle abundance and species richness in hypothetical development scenarios representing the housing density/sprawl area trade-off. Our results suggest that clustering...
Tipo: Peer-Reviewed Reports
Palavras-chave: Development scenario; Forest fragmentation; Forest taxa; Ground beetle; Housing density; Residential development; Urban sprawl.
Ano: 2010

Modeling the Geography of Migratory Pathways and Stopover Habitats for Neotropical Migratory Birds
Provedor de dados: 7
Autores: Tankersley, Jr., Roger; Tennessee Valley Authority; rdtankersley@tva.gov; Orvis, Kenneth; ; orvis@utk.edu.
Intact migratory routes are critical for the stability of forest-dwelling, neotropical, migratory bird populations, and mortality along migratory pathways may be significant. Yet we know almost nothing about the geography of available stopovers or the possible migratory pathways that connect optimal stopovers. We undertake a spatial analysis of stopover habitat availability and then model potential migratory pathways between optimal stopovers in the eastern United States. Using models of fixed orientation and fixed nightly flight distance between stopovers during spring migration, we explore whether a simple endogenous migratory program is sufficient to ensure successful migration across the modern landscape.  Our model runs suggest that the modern...
Tipo: Peer-Reviewed Reports
Palavras-chave: Conservation; Forest fragmentation; Habitat; Migration; Modeling; Neotropical migratory birds; Stopover ecology.
Ano: 2003

Global-Scale Patterns of Forest Fragmentation
Provedor de dados: 7
Autores: Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James D; U.S. Environmental Protection Agency, National Exposure Research Laboratory; wickham.james@epa.gov; O'Neill, Robert; ; eoneill@attglobal.net; Jones, K. Bruce; U.S. Environmental Protection Agency, National Exposure Research Laboratory; jones.bruce@epa.gov; Smith, Elizabeth; U.S. Environmental Protection Agency, National Exposure Research Laboratory; smith.betsy@epa.gov.
We report an analysis of forest fragmentation based on 1-km resolution land-cover maps for the globe. Measurements in analysis windows from 81 km 2 (9 x 9 pixels, &amp;#8220;small&amp;#8221; scale) to 59,049 km 2 (243 x 243 pixels, &amp;#8220;large&amp;#8221; scale) were used to characterize the fragmentation around each forested pixel. We identified six categories of fragmentation (interior, perforated, edge, transitional, patch, and undetermined) from the amount of forest and its occurrence as adjacent forest pixels. Interior forest exists only at relatively small scales; at larger scales, forests are dominated by edge and patch conditions. At the smallest scale, there were significant differences in fragmentation among continents; within continents,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Biogeography; Edge effect; Forest fragmentation; Geographic information systems; Global patterns; Land-cover map; Landscape ecology; Modeling; Perforated forest; Remote sensing; Satellite imagery; Spatial pattern.
Ano: 2000

Landscape Connectivity as a Function of Scale and Organism Vagility in a Real Forested Landscape
Provedor de dados: 7
Autores: D'Eon, Robert G; Self-employed; rdeon@interchange.ubc.ca; Glenn, Susan M; Department of Forest Sciences, University of British Columbia; SGlenn@gccnj.edu; Parfitt, Ian; Selkirk College; iparfitt@selkirk.ca.
Landscape connectivity is considered a vital element of landscape structure because of its importance to population survival. The difficulty surrounding the notion of landscape connectivity is that it must be assessed at the scale of the interaction between an organism and the landscape. We present a unique method for measuring connectivity between patches as a function of organism vagility. We used this approach to assess connectivity between harvest, old-growth, and recent wildfire patches in a real forested landscape in southeast British Columbia. By varying a distance criterion, habitat patches were considered connected and formed habitat clusters if they fell within this critical distance. The amount of area and distance to edge within clusters at...
Tipo: Peer-Reviewed Reports
Palavras-chave: British Columbia; Dispersal; Forest fragmentation; Landscape connectivity; Marten; Northern flying squirrel; Northern goshawk; Scale; Vagility.
Ano: 2002

Patterns of composition, richness and phylogenetic diversity of woody plant communities of Quillaja saponaria Molina (Quillajaceae) in the Chilean sclerophyllous forest
Provedor de dados: 73
Autores: Letelier,Luis; Valderrama,Aly; Stoll,Alexandra; García-Gonzáles,Rolando; González-Rodríguez,Antonio.
ABSTRACT Sclerophyllous forest is among the most representative types of woody plant communities in central Chile where Quillaja saponaria is considered to be one of the most important species. In this study, we analysed the main factors that explain the geographical patterns of variation in composition, richness and phylogenetic diversity of woody plant communities in the Chilean sclerophyllous forest where Quillaja saponaria is present. Vegetation surveys were performed for trees and shrubs in thirty-nine sites from 30° to 38° of latitude South in the Mediterranean biome of Chile. Composition, richness, alfa diversity and phylogenetic diversity metrics of the communities were calculated and associated with spatial (latitude, longitude and altitude),...
Tipo: Journal article
Palavras-chave: Diversity; Forest fragmentation; Mediterranean flora; Phylogenetic diversity; Vegetation matrix.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100057

Activity patterns of frugivorous phyllostomid bats in an urban fragment in southwest Amazonia, Brazil
Provedor de dados: 76
Autores: Verde,Rair S.; Silva,Richarlly C.; Calouro,Armando M.
ABSTRACT: The habitat fragmentation modifies the pattern of animal activity. This study aimed to determine the activity pattern of frugivorous bat species in an urban forest fragment in southwestern Amazonia. The study was conducted from August 2013 to September 2014 with 10 mist nets (9m x 2.5m), opened at ground level throughout all the night and totaling 64,800 m².hour/net. Two hundred and sixty-one captures of bats from 28 species were recorded. The period with the highest capture rate and species of bats was the first period of the night (until 00:00). The species with the highest incidence of catches were, in ascending order, Carollia brevicauda (Schinz, 1821), Carollia perpicillata (Linnaeus, 1758), Artibeus planirostris (Spix, 1823), and Artibeus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon forest; Forest fragmentation; Fruit-eating; Pattern hourly activity; Phyllostomidae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100216

Sex ratio and morphological characteristics of rufous gnateaters, Conopophaga lineata (Aves, Passeriformes) in Atlantic forest fragments
Provedor de dados: 76
Autores: Dantas,Gisele P. M.; Santos,Fabrício R.; Marini,Miguel Ângelo.
Unequal sex ratios lead to the loss of genetic variability, decreasing the viability of populations in the long term. Anthropogenic activities often disturb the natural habitats and can cause alterations in sex ratio and morphological characteristics of several species. Forest fragmentation is a major conservation concern, so that understanding its effects in natural populations is essential. In this study, we evaluated the sex ratio and the morphological characteristics of Rufous Gnateaters (Conopophaga lineata (Wied, 1831)) in small and large forest fragments in Minas Gerais, Brazil. Birds (n = 89) were sexed by plumage characteristics and molecular markers. The molecular analysis showed that plumage is not a totally reliable method for sexing Rufous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest fragmentation; Sex ratio; Atlantic forest; Conopophagidae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000100017

Feeding habits of mosquitoes (Diptera: Culicidae) in an area of sylvatic transmission of yellow fever in the state of São Paulo, Brazil
Provedor de dados: 80
Autores: Mucci,Luis Filipe; Cardoso Júnior,Rubens Pinto; Paula,Marcia Bicudo de; Scandar,Sirle Abdo Salloum; Pacchioni,Márcio Lunardeli; Fernandes,Aristides; Consales,Cleide Aschenbrenner.
AbstractBackground The reintroduction of sylvatic yellow fever in the state of São Paulo after about six decades was confirmed in the Northwestern region in 2000, where in 2008 there also occurred an important epizootic. The purpose of this study was to investigate the feeding habits of culicids potentially involved in the sylvatic transmission of the virus in this region.Methods Specimens were collected in 24 forested localities at ground level with hand nets and mouth aspirators. Collections were made quarterly between October 2006 and July 2008 during daylight hours. Blood-meal identification was carried out in mosquitoes of the tribes Aedini, Mansoniini and Sabethini. The biotin/avidin sandwich ELISA was employed to determine six source types: bird,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding habit; Sylvatic yellow fever; Neotropical mosquitoes; Non-human primate; Forest fragmentation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100316

Conservation of the endemic Javan hawk-eagle Spizaetus bartelsi Stresemann, 1924 (Aves: Falconiformes): density, age-structure and population numbers
Provedor de dados: 16
Autores: Balen, S. (Bas) van; Nijman, Vincent; Sözer, Resit.
The endemic Javan hawk-eagle Spizaetus bartelsi is considered threatened with extinction because of its small population size and fragmentation of its habitat on the densely populated island of Java, Indonesia. Like many other tropical forest raptors little is known about many of its population parameters. Research was carried out from 1980 to 2000 in order to assess the status of this species. Its presence was confirmed throughout the island in both wet and dry climatic zones. Home range sizes were calculated to range between 12-36 km², and comparison with published estimates suggests that these may differ significantly between areas. Encounter rates are in the order of 0.1-0.9 birds per survey day, and were significantly higher in areas with a short dry...
Tipo: Article / Letter to the editor
Palavras-chave: Birds-of-prey; Raptor; Forest fragmentation; Java; Indonesia.
Ano: 2001
URL: http://www.repository.naturalis.nl/record/534326

Resposta da comunidade de formigas aos atributos dos fragmentos e da vegetação em uma paisagem da Floresta Atlântica nordestina
Provedor de dados: 82
Autores: Gomes,Juliana P; Iannuzzi,Luciana; Leal,Inara R.
The objective of this study was to determine the effects of forest fragmentation on ant richness in a landscape of Atlantic Forest in Northeast Brazil. More specifically, the ant richness was related to the attributes of fragments (area and distance from the fragment central point to the edge), landscape (forest cover surrounding the fragments), and tree community (plant density, richness, and percentage of shade tolerant species). The surveys were carried out in 19 fragments located in Alagoas State from October 2007 to March 2008. Samples were collected through a 300 m transect established in the center of each fragment, where 30 1-m² leaf litter samples were collected at 10 m intervals. A total of 146 ant species was collected, which belonged to 42...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ant species richness; Ant functional group; Forest fragmentation; Leaf-litter ant; Tree community.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000600008

A confirmation method for the presence of the Siberian flying squirrel via feces
Provedor de dados: 19
Autores: 嶌本, 樹; 古川, 竜司; 鈴木, 圭; 柳川, 久; YANAGAWA, Hisashi.
タイリクモモンガPteromys volansは，フィンランドやエストニア，韓国などでは森林分断化の影響による個体数の減少が危惧されている．北海道の十勝地方においても，過去の森林分断化によって生息地が減少した上に，現在でもさらに生息地の分断化・減少が進行している．本種に対する森林分断化の影響を評価するには，生息確認方法を確立し，生息状況をモニタリングする必要がある．本研究では，糞による簡便かつ効率的な生息確認方法を確立するために，糞が頻繁に発見される場所の特徴や糞の発見効率を検討した．11ヶ所の樹林地（面積0.42–13.69 ha）において，それぞれ10 mの調査ラインをランダムに12本引き，両側4 m（片側2 m）の範囲で糞の有無を確認した．全ての樹林地で本種の糞が発見され，1ヶ所の樹林地あたりの発見糞塊数は平均9.7個，発見ライン数は平均6.2本であった．糞は胸高直径が太い樹木の近くでよく発見され，胸高直径24 cm以上の樹木から20 cm以内の範囲で糞を探すことが効率的であることがわかった．一方で，樹林面積は糞の発見ライン数に影響しなかった．そのため，樹林面積の大きさによって，調査努力量を変える必要はないと考えられた．本調査の結果から，面積に関わらず1ヶ所の樹林地につき5本程度のラインを引いて糞を探すことで，簡便かつ効率的に本種の生息を確認できることがわかった．
Palavras-chave: Feces; Forest fragmentation; Pteromys volans; Siberian flying squirrel.
Ano: 2014
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4114

Corredores ecológicos como ferramenta para a desfragmentação de florestas tropicais
Provedor de dados: 190
Autores: Seoane, Carlos Eduardo Sícoli; Diaz, Vinícius Sandri; Santos, Tomaz Longhi; Froufe, Luís Claudio Maranhão.
A expansão do uso e ocupação antrópica do espaço terrestre leva a uma severa fragmentação dos habitats naturais. Corredores ecológicos podem facilitar o deslocamento de organismos entre fragmentos de habitats e têm sido cada vez mais adotados como uma ferramenta para manter e restaurar a biodiversidade. A teoria da metapopulação é uma das bases para os atuais estudos sobre corredores ecológicos. Esses estudos ainda estão pouco desenvolvidos, especialmente em ecossistemas tropicais, carecendo de bases científicas sólidas para apoiar a sua utilidade. No entanto, os efeitos da fragmentação florestal são tão severos que é justificável o planejamento e a execução de medidas que busquem atenuá-las, apesar de não estarem disponíveis resultados de pesquisas que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corredores ecológicos; Fragmentação florestal; Monitoramento; Permeabilidade da paisagem Biological corridors; Forest fragmentation; Monitoring; Landscape permeability.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/158

Avifauna on small farms aiming forest management in Fernandes Pinheiro city, Parana State, Brazil
Provedor de dados: 190
Autores: Marcelino, Vânia Rossetto; Martins, Kelly Geronazzo; Figueiredo Filho, Afonso.
This work aimed to carry out a first diagnosis of local birds, concentrating in six fragments of Ombrophyllous Mixed Forest, using methods adequate to be repeated in subsequent periods. The assessment of birds on long-term may be used as local bio-indicator, especially because these areas will be managed in the future. In the sampledarea it was registered 124 species from 41 families. Four species listed in the Red Book of Threatened Fauna in the State of Paraná were recorded: Polioptila lactea (Creamy-bellied Gnatcatcher), Mesembrinibis cayennensis (Green Ibis), Accipiter superciliosus (Tiny Hawk) and Leptasthenura striolata (Striolated Tit-Spinetail). When the six forest fragments were assessed using the irregular transects method, it was registered 102...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ombrophyllous Mixed Forest; Forest fragmentation; Bioindicator; Tree community; Birds Recursos Florestais; Engenharia Florestal; Conservação da Natureza Floresta Ombrófila Mista; Fragmentação florestal; Bioindicador; Comunidade arbórea; Aves.
Ano: 2014
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/542

Population structure of Eschweilera coriacea (DC.) S. A. Mori in forest fragments in eastern Brazilian Amazonia
Provedor de dados: 88
Autores: Lopes,Maria Aparecida.
The population structure of a common canopy tree was examined in three sites to investigate the possible effects of forest fragmentation in eastern Amazonia. Evidence for the escape hypothesis of differential seed/seedling survival was evaluated. Two 1 ha plots were established at each site and all individuals of Eschweilera coriacea (DC.) S. A. Mori over 1 m tall were tagged, measured and mapped. Smaller individuals were recorded in the same way within subplots. Mature individuals were abundant at all sites with densities of 32-52 ha-1. The species exhibited substantial regeneration, although total population density varied fourfold among sites (1,256-4,805 individuals ha-1). Overall, juveniles were clumped while adults were randomly distributed. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersion pattern; Escape hypothesis; Forest fragmentation; Neotropical forest; Population density.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000300015

Records of the giant-armadillo Priodontes maximus (Cingulata: Dasypodidae) in the Atlantic Forest: are Minas Gerais and Espírito Santo the last strongholds of the species?
Provedor de dados: 103
Autores: Srbek-Araujo,Ana Carolina; Scoss,Leandro M.; Hirsch,André; Chiarello,Adriano G.
We report 20 records of Priodontes maximus (Kerr, 1792) collected between 1990 and 2009 in three nature reserves located in forested areas of southeastern Brazil within the Atlantic Forest biome. Seventeen records were collected in Parque Estadual do Rio Doce (PERD), state of Minas Gerais, two in Reserva Biológica de Sooretama and one in Reserva Natural Vale, both located in the state of Espírito Santo. The records were burrows (n = 11), photographs from camera-traps (n = 6), sightings (n = 2) and carcass (n = 1). Given the higher number of records, the PERD seems to maintain the largest population among the three study areas. We searched the literature and found no other recent evidence of the species' presence in the Atlantic forest of Brazil. There are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endangered species; Extinction; Forest fragmentation; Xenarthra.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300010

Denied density-dependent seedling recruitment in a fragmented forest does not decrease seedling diversity
Provedor de dados: 97
Autores: VALDIVIA,CARLOS E; SIMONETTI,JAVIER A.
Negative density-dependent relationships in plant communities are currently claimed as an important mechanism for the maintenance of plant diversity. However, anthropogenic perturbations such as forest fragmentation might modify such relationships. We evaluated density-dependent relationships between seed and seedling abundance of a tree assemblage in a fragmented forest for estimating seed-to-seedling transitions and their effects on seedling richness. In continuous forest, two out of four and one out of four species presented significant or a tendency to exhibit negative seedling recruitment which is in agreement with other temperate and tropical forests. In forest fragments (1-6 ha), however, this relationship was uncoupled. Seedling richness and...
Tipo: Journal article
Palavras-chave: Density-dependent recruitment; Diversity; Forest fragmentation; Seedlings; Seeds.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200012

Abiotic alterations caused by forest fragmentation affect tree regeneration: a shade and drought tolerance gradient in the remnants of Coastal Maulino Forest
Provedor de dados: 97
Autores: GUERRERO,PABLO C; BUSTAMANTE,RAMIRO O.
Plant regeneration is strongly determined by light and soil moisture differences between habitáis; both variables are modified by large-scale forest fragmentation. Several studies have indicated this alteration as the mechanism involved in tropical forest community change. The effects of fragmentation may be much more severe in Mediterranean and deciduous forests, because plant species in these forests show a stress tolerance tradeoff between shade and drought. Our study was performed in the deciduous fragmented Coastal Maulino Forest: Reserva Nacional Los Queules (RNLQ) and surrounding small fragments. We hypothesised that Aristotelia chilensis (shade intolerant but drought tolerant) should increase its regeneration in small patches as a consequence of...
Tipo: Journal article
Palavras-chave: Ecological restoration; Forest fragmentation; Safe sites; Seed germination; Seedling establishment.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300008

Efeitos da fragmentação florestal sobre vespas e abelhas solitárias em uma área da Amazônia Central
Provedor de dados: 104
Autores: Morato,Elder F.; Campos,Lúcio Antônio de O.
The effects of forest fragmentation on tree-hole nesting solitary wasps and bees were investigated at a site 90 km north of Manaus, Brazil. Wasp and bee faunas were monitored in continuous terra firme forest, forest fragments of 1, 10 and 100 ha, natural gaps in continuous forest and deforested areas. These habitats were studied in terms of abundance, richness, diversity and similarity. The wasps and bees were monitored monthly during June 1988 through June 1990 by means of a trap-nests technique. A total of 1529 nests of wasps of 24 species and 405 nests of bees of 14 species were collected. The number of species of wasps and bees varied little among the habitats. The genus Trypoxylon Latreille, 1796 (Sphecidae) accounted for 79% of wasp nests and Centris...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Forest fragmentation; Solitary bees; Solitary wasps; Trap-nests.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000200014

Efeitos da fragmentação florestal sobre vespas e abelhas solitárias na Amazônia Central. II. estratificação vertical
Provedor de dados: 104
Autores: Morato,Elder Ferreira.
The effects of forest fragmentation on the patterns of vertical abundance and richness of solitary wasp and bee communities was investigated near Manaus, Amazonas. Wasps and bees were trap-nested at 1,5, 8 and 15 m above the ground in continuous primary forestand isolated forest fragments. In general, the number of nests and species increased with height for both groups. In particular, bee species richness at 15 m was almost twice that at 1,5 mm. However, one species of Trypoxylon Latreille, 1796 (Sphecidae) consistently nested in the understorey. Thus, patterns of abundance and richness distributions indicated stratification. A contingency analysis showed that fragmentation altered stratification of nesting activity of the wasp community in fragments....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest fragmentation; Amazonia; Stratification; Solitary wasps; Solitary bees.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000300010

Movements of bats (Mammalia, Chiroptera) in Atlantic Forest remnants in southern Brazil
Provedor de dados: 104
Autores: Bianconi,Gledson V.; Mikich,Sandra B.; Pedro,Wagner A.
We used mark and recapture techniques to evaluate movements of bats within and between three brazilian forest remnants. We captured bats with mist-nets in four 1 ha plots representing different degrees of isolation of riparian (two plots) and submontane (two plots) forests between July 2002 and June 2003. Using numbered aluminium tags, we marked 635 bats of seven species and 54 individuals of six species were recaptured. Overall, we recaptured Carollia perspicillata (Linnaeus, 1758) (short-tailed fruit bat) most frequently, especially in plots where they were banded in the riparian forest plots. These results suggest that this bat has restricted feeding areas, which are probably determined by the abundance of Piper Linnaeus (Piperaceae), its preferred food...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artibeus; Carollia perspicillata; Foraging behavior; Forest fragmentation; Mark/recapture.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000400030

Composição e dinâmica da avifauna da mata de Santa Genebra, Campinas, São Paulo, Brasil
Provedor de dados: 104
Autores: Aleixo,Alexandre; Vielliard,Jacques M.E.
A quali-quantitative survey of avifauna was earried out at the Santa Genebra forest reserve (MSG) in order to evaluate the current state of conservation of this important conservation area in the interior of São Paulo Stale. The qualilative survey recorded 134 species and the quantitativo survey through unlimited distance point counts recorded the abundance of 97 species. The low number of species recorded in both surveys was due to the small size (251 ha) and the high degree of isolation of the MSG. These factors plus the extensivo degradation of the forest cover prevent recolonization of extinct species and allow the expansion of some species tolerant to disturbance. The quantitative survey showed some species with an unusually high abundance index. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bird community; Unlimited distance point counts; Forest fragmentation; Density compensation.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300004

Biologia de Centris Fabricius (Hymenoptera, Anthophoridae, Centridini) em matas contínuas e fragmentos na Amazônia Central
Provedor de dados: 104
Autores: Morato,Elder F.; Garcia,Marcos V. B.; Campos,Lúcio Antônio de O.
A study of four tree-hole nesting bee species of Centris Fabricius, 1804 was conducted between July, 1988 and June, 1990 in isolated and continuous "terra firme" forests at Manaus region. Nests were obtained from wood trap-nests of different diameters and consisted of a linear series of brood cells. Centris dichrootricha (Moure, 1945) and C. terminata Smith, 1874 were the most abundant species. Centris terminata nested principally in gaps and continuous forest and C. dichrootricha in cleared areas and small fragments of forest. More nests were obtained in trap-nests placed at 8 and 15 m height above ground. Nesting activity was more pronounced in the wet season between August and January. Natural enemies are the beetle Tetraonyx Latreille, 1805 and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthophoridae; Centris; Amazonia; Forest fragmentation; Bee biology.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400029

Plant diversity in hedgerows amidst Atlantic Forest fragments
Provedor de dados: 39
Autores: Oliveira,Carolina C. C.; Pereira,Lya C. S. M.; Lima,André; Shimabukuro,Yosio E.; Torezan,José Marcelo D.
Hedgerows are linear structures found in agricultural landscapes that may facilitate dispersal of plants and animals and also serve as habitat. The aim of this study was to investigate the relationships among diversity and ecological traits of woody plants, hedgerow characteristics (size, age, and origin), and the structure of the surrounding Atlantic Forest landscape. Field data were collected from 14 hedgerows, and landscape metrics from 1000-m buffers surrounding hedgerows were recorded from a thematic map. In all sampled hedgerows, arboreal species were predominantly zoochoric and early-succession species, and hedgerow width was an important factor explaining the richness and abundance of this group of species. Connection with forest vegetation did not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Ecological corridors; Forest fragmentation; Hedgerows; Landscape ecology; Rural landscape; Seed dispersal; Woody plants.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200239

Edge effect on vascular epiphytic composition in a fragment of Atlantic Forest in northeastern Brazil
Provedor de dados: 39
Autores: Dias-Terceiro,Randolpho Gonçalves; Peixoto,Gabriela Marques; Gomes,Vitor Serrano; Menezes,Marcelo Costa; Neco,Eudécio Carvalho; Pessoa,Tainá Sherlakyann Alves; Fabricante,Juliano Ricardo; Albuquerque,Manoel Bandeira.
Epiphytes are common in the canopy of temperate and tropical forests, where they substantially contribute to species diversity and to key ecosystem processes. However, little is known about the effects caused by deforestation on this group of species, especially in northeastern Brazil, an area experiencing intense anthropogenic pressure. This study aimed to evaluate the effect of environmental variables on the structure of assemblies of vascular epiphytes in a fragment of open ombrophilous forest, Areia, northeastern Brazil. Sixty 10 × 10 m sampling plots were installed to cover different environments within the fragment. The relationship between environmental variables and species composition was evaluated by means of a generalized linear mixed model. The...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Brejo de altitude; Community ecology; Epiphytism; Environmental factors; Forest fragmentation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200270

Environmental degradation impact on native communities of arbuscular mycorrhizal fungi in an urban fragment of semideciduous plateau forest
Provedor de dados: 39
Autores: Carrenho,Rosilaine; Gomes-da-Costa,Sandra Maria.
Three forest reserves, with highly degraded areas, are open to visitors in Maringá, Paraná, Brazil. Impact caused by tree cutting, heavy traffic and visitors on the establishment of arbuscular mycorrhizal fungi (AMF) was evaluated in two areas with different degradation stages of the Dr. Luis Teixeira Mendes Forest Garden, a remnant of semideciduous forest. Soil samples were removed from three locations within each area; spores were isolated from the soil by wet sieving and sucrose centrifugation and mounted on permanent slides. Spores were counted and identified taxonomically under a microscope. Diversity, dominance, equitability and similarity indexes were calculated from abundance data. The degraded area had the highest number of spores and featured...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Glomeromycetes; Forest fragmentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000200013

The role of temporal scale in linear edge effects on a submontane Atlantic forest arboreal community
Provedor de dados: 39
Autores: Couto-Santos,Ana Paula Lima do; Conceição,Abel Augusto; Funch,Ligia Silveira.
This study aims to detect the composition, abundance patterns, and successional stage distributions exhibited by arboreal species inside and at the linear edge of a submontane seasonal forest in the Chapada Diamantina (12°28'31'S, 41°23'14'W), Bahia, Brazil. The individual plants with breast height diameters ≥5 cm were sampled in 30 quadrats (10 m × 10 m), 15 in the forest edge and 15 inside the forest. Species were classified according to successional category. Phytosociological and diversity indices were calculated. Shannon indices were compared using Hutcheson's t-test, and the remaining parameters were analyzed by ANOVA. Linear edges exerted a high impact on the floristic composition, diversity, and abundance of species, though little interference was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chapada Diamantina; Diversity; Forest fragmentation; Successional categories; Vegetation structure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200190

Fragment shape and size, landscape permeability and fragmentation level as predictors of primate occupancy in a region of Brazilian Cerrado
Provedor de dados: 3
Autores: Grande, Thallita Oliveira; Alencar, Raony Macedo; Ribeiro, Paulo Pinheiro; Melo, Fabiano Rodrigues.
Human activities result in the formation of a mosaic of forest patches within a non-habitat matrix. The response of the local biodiversity to changes in land-use may occur at different scales. It is important to evaluate the effects of the attributes of both the patches and the surrounding landscape on the occupancy of forest patches by animal populations. Here, we assessed the predictive potential of local (basal area, tree density), patch (size, shape) and landscape scale (total area of forest, number of patches, matrix permeability, patch proximity) variables on the occupancy of forest patches by the syntopic primates Alouatta caraya, Sapajus libidinosus and Callithrix penicillata in the city of Goiânia in the Cerrado region of central Brazil. We used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primate syntopy patch occupancy matrix forest fragmentation playback primate syntopy; Patch occupancy; Matrix; Forest fragmentation; Playback.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/48339

Roadkill of wild vertebrates along the GO-060 road between Goiânia and Iporá, Goiás State, Brazil - doi: 10.4025/actascibiolsci.v32i3.4752
Provedor de dados: 3
Autores: Cunha, Hélida Ferreira da; UEG; Moreira, Fabiane Geralda Alves; Silva, Silvania de Sousa.
Roadkill of wild vertebrates along GO-060, Brazil. Roads represent an old and constant cause of accidental death of wildlife. From May 2004 to November 2005, we recorded the roadkills of vertebrates in the GO-060 road between Goiânia and Iporá. For each road-killed animal we wrote down the species and location along the road. We found 308 animals road-killed from at least 25 vertebrate species: 86% mammals, 11% birds and 3% reptiles. Tamandua tetradactyla, Cerdocyon thous and Myrmecophaga tridactyla were, in decreasing order, the species with the largest number of road-killed individuals. Among mammals, the number of road-killed individuals was not related to species weight. The number of species and road-killed animals was constant throughout the 17...
Tipo: Mortalidade
Palavras-chave: 2.05.00.00-9 road mortality; Forest fragmentation; Cerrado; Brazil Ecologia road mortality; Forest fragmentation; Cerrado; Brazil.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/4752

Avifauna from a campus of Universidade Estadual do Centro-Oeste, Guarapuava, Paraná State, Brazil - doi: 10.4025/actascibiolsci.v33i2.7710
Provedor de dados: 3
Autores: Vogel, Huilquer Francisco; Universidade Estadual do Centro-Oeste; Metri, Rafael; Universidade Estadual de Maringá; Zawadzki, Claudio Henrique; Universidade Estadual de Maringa; Moura, Maurício Osvaldo; Universidade Estadula do Centro-Oeste.
This study examined the structure and species richness of the avifauna in CEDETEG campus of Universidade Estadual do Centro-Oeste (Unicentro), in the urban area of Guarapuava, at Paraná State. Data were monthly taken from July 2006 to June 2007 using transects. A total of 125 bird species belonging to 42 families and 16 orders was recorded. The absence of large frugivorous species reveals the destabilization of native vegetation, evidencing that the current floristic structure does not support more specialized species. However, from the total amount of registered birds, 47 (38%) are related to the forest environment in the study area and 25 species (20%) are exclusive of this environment, pointing out the strong relevance of this campus for the...
Tipo: Composição de espécies
Palavras-chave: 2.05.00.00-9 Avifauna; Forest fragmentation; Ombrophilous mixed forest Ecologia Avifauna; Forest fragmentation; Ombrophilous mixed forest.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7710

The population structure of Lonchocarpus cultratus in an Atlantic Forest riparian zone of the upper Paraná River, Brazil
Provedor de dados: 3
Autores: Almeida, Cristina Guilherme de; Souza, Maria Conceição de; Slusarsk, Simone Rodrigues.
The goal of this study was to evaluate the population structure of Lonchocarpus cultratus located in a riparian zone in the flood plain of the upper Paraná River. Data were collected on the stem diameter at breast height (DBH) and the plant height from two phytosociological inventories, which were performed with a 14-year interval, using data collected in studies conducted in 1992 and 2006 in an Atlantic Forest riparian zone remnant of Paraná State, Brazil. Class intervals for DBH and plant height were defined using the Spiegel equation, and the measured values were distributed between the different distinct classes. The distribution of individuals between the different DBH classes was analyzed using de Liocourt’s quotient (q). For both stages of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecologia Diameter structure; Forest dynamics; Forest fragmentation; Recruitment rate Estrutura diamétrica.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/30439

Species richness and relative abundance of birds in natural and anthropogenic fragments of Brazilian Atlantic forest
Provedor de dados: 42
Autores: Anjos,Luiz dos.
Bird communities were studied in two types of fragmented habitat of Atlantic forest in the State of Paraná, southern Brazil; one consisted of forest fragments that were created as a result of human activities (forest remnants), the other consisted of a set of naturally occurring forest fragments (forest patches). Using quantitative data obtained by the point counts method in 3 forest patches and 3 forest remnants during one year, species richness and relative abundance were compared in those habitats, considering species groups according to their general feeding habits. Insectivores, omnivores, and frugivores presented similar general tendencies in both habitats (decrease of species number with decreasing size and increasing isolation of forest fragment)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Bioacoustics; Brazilian Atlantic forest; Conservation; Forest fragmentation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200036

Frugivorous butterflies from the Atlantic Forest in Southern Brazil (Lepidoptera: Nymphalidae)
Provedor de dados: 49
Autores: Bordin,Sandra Mara Sabedot; Monteiro,Marcelo; Ferreira,Valéria Wesner; Lutinski,Junir Antonio; Rodrigues,Everton Nei Lopes.
Abstract: This study aimed to present a list of the species of frugivorous butterflies occurring in Atlantic Forests, in the Conservation Units: National Forest of Chapecó (FLONA), Ecological Station of Mata Preta (ESEC) and State Park of Araucárias (PAEAR) and adjacent forest fragments, located in the western region of the state of Santa Catarina. Three samplings were conducted between December 2017 and March 2018, totaling 24 days of collection in each sampling area. Van Someren-Rydon traps were used to capture frugivorous butterflies. There were 4,231 frugivorous butterflies belonging to four subfamilies, 12 tribes and 49 species. In all, 37 species of frugivorous butterflies were sampled in FLONA and 29 in adjacent forest fragments. In ESEC, 29 species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Diversity; Ecology; Forest fragmentation; Species richness.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000400310

Decadal persistence of frugivorous birds in tropical forest fragments of northern Paraná
Provedor de dados: 49
Autores: Zaiden,Tiago; Marques,Fernanda Cristina; Medeiros,Hugo Reis; Anjos,Luiz dos.
Forest fragmentation is a major cause of loss of species. We evaluated the local extinction of medium-large frugivorous bird species in six forest fragments of northern Paraná: the Parque Estadual Mata dos Godoy (PEMG), the largest and most preserved forest fragment in the region, and five other fragments. Fixed-width point counts and line transects were conducted along trails in the PEMG for 10 days: from September 2010 to March 2011, and from August 2011 to November 2011. Avian surveys in each of the other forest fragments were made over four days from October to December 2011. We compared data with a previous census carried out 10 years earlier. No extinction events were recorded from the PEMG. However, the relative abundance of species significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest fragmentation; Large frugivorous birds; Extinction debit.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000200107

Tree mortality, recruitment and growth in a bamboo dominated forest fragment in southwestern Amazonia, Brazil
Provedor de dados: 49
Autores: Medeiros,Herison; Castro,Wendeson; Salimon,Cleber Ibraim; Silva,Izaias Brasil da; Silveira,Marcos.
Forest fragmentation affects the structure and dynamics of plant communities, leading to biodiversity loss in forest remnants. In this paper we show that in a bamboo (Guadua weberbaueri Pilger) dominated forest fragment in southwestern Amazonia edge effect may be confounded by bamboo effect, which also occur inside the forest. We measured growth, mortality and, recruitment rate of trees with DBH ≥ 10 cm, in a fragment of bamboo dominated open forest in southwestern Amazonia, state of Acre, Brazil, in 15 plots at the forest edge and 15 plots inside the forest fragment, 500 m away from the border. Time interval between censuses was 1.8 years. The average diameter growth rate differed significantly between edge (3.82 ± 0.10 mm a-1) and interior (2.39 ± 0.18...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest fragmentation; Edge effect; Open forest with bamboo; Plant communities; Forest succession; Tropical forest dynamic.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200029

Genetic variability of pre and post-fragmentation cohorts of Aspidosperma polyneuron Muell. Arg. (Apocynaceae)
Provedor de dados: 52
Autores: Torezan,José Marcelo Domingues; Souza,Rogério Fernandes de; Ruas,Paulo Maurício; Ruas,Claudete de Fátima; Camargo,Elvis Hassmann; Vanzela,André Luís Laforga.
RAPD was used to access the genetic variability in Aspisdosperma polyneuron, a long-lived, late-reproducing tropical tree, and highly important for the Atlantic Forest. RAPD profiles from adults (pre-fragmentation, &gt;300 years old) and seedlings (post-fragmentation, &lt;&lt;50 years old) were analyzed. Results showed a decrease of genetic polymorphism of post-fragmentation cohorts in small fragments and higher genetic diversity within population. The genetic diversity distribution suggested the establishment of fragments as protected reserves, and the transference of seedlings among fragments for conservation of A. polyneuron.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspidosperma; DNA markers; Forest fragmentation; Genetic variability; Peroba-rosa; RAPD.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000200002

Diet and prey availability of terrestrial insectivorous birds prone to extinction in amazonian forest fragments
Provedor de dados: 52
Autores: Mestre,Luiz Augusto Macedo; Cohn-Haft,Mario; Dias,Manoel Martins.
This study compared niche breath, prey size, and diet variability in two pairs of sympatric species of terrestrial insectivorous birds, each pair containing one species that can persist in small forest fragments and one that does not. The pairs were Myrmeciza ferruginea and Sclerurus rufigularis; and Formicarius colma and F. analis, respectively. The prey availability in forest fragments was also sampled and compared to the availability in continuous forests. Niche breath indices did not differ between pair members, but diet variability differed in the opposite direction from that hypothesized. Although the two bird species most vulnerable to fragmentation fed on larger prey than less vulnerable species, prey availability, including that based on prey size...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian forests; Bird diet; Forest fragmentation; Insectivores; Formicarius colma; Formicarius analis; Myrmeciza ferruginea; Sclerurus rufigularis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600014