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A quantitative analysis of forest fragmentation in Los Tuxtlas, southeast Mexico: patterns and implications for conservation RChHN
MENDOZA,EDUARDO; FAY,JOHN; DIRZO,RODOLFO.
Habitat loss is a critical threat to tropical biodiversity and its quantification constitutes a central conservation issue. Typically, assessments have been based on deforestation rates statistics. However, this overlooks the effects brought about by the spatial reconfiguration of the remaining habitat: fragmentation. We present an analysis of fragmentation in a Neotropical site aimed at: (a) devising a protocol for its quantification, (b) using such protocol to provide insights on the ecological consequences of fragmentation, (c) exploring its applicability to address the hypothesis that forest size-inequality decreases with elevation, an indicator of habitat accessibility. We applied the Gini coefficient (G) and the Lorenz curve to analyze fragment-size...
Tipo: Journal article Palavras-chave: Edge effect; Fragment shape; Gini coefficient; Lorenz curve; Tropical rain forest.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300008
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Aquatic invertebrates associated with bromeliads in Atlantic Forest fragments Biota Neotropica
Paula Júnior,Antonio Teixeira de; Rosa,Beatriz Figueiraujo Jabour Vescovi; Alves,Roberto Gama; Divino,Alex Campos.
Abstract: Forest fragments in the state of Minas Gerais contain a large number of Bromeliaceae genera, whose cisterns accumulate water and organic matter, providing shelter and food for a wide range of organisms. However, these fragments often consist only of small patches of vegetation, making the species more vulnerable to the effects of this landscape changes. This study aimed to test the effect of the distance to the edge and of the matrix type on the structure of aquatic invertebrate communities in four morphospecies of bromeliads. Samples were collected in Atlantic Forest fragments adjacent to pasture and planted forest areas, in a region of Serra da Mantiqueira, Brazil. Of the 147 bromeliads investigated, we found 35 taxa, among which the most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Phytotelma; Invertebrates; Remaining forest.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000100202
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Are the vegetation structure and composition of the shrubby Caatinga free from edge influence? Acta Botanica
Santos,André Maurício de Melo; Santos,Bráulio Almeida.
Edge influence, or edge effect, drives many biological changes in fragmented landscapes. This has been extensively studied in many forest ecosystems, but it remains to be described for the Brazilian Caatinga. Based on the biotic and physical conditions of the shrubby Caatinga, our prediction a priori was that this type of vegetation is free from edge influence in terms of vegetation structure and composition. We sampled shrubs, cacti and trees in twenty 200 m² plots on old edges (>60 yrs old) and interior of a 690 ha fragment, partially isolated and surrounded by Opuntia ficus-indica cacti. Plant height, stem diameter at ground level, stem density, species richness and diversity were statistically equal between edge and interior habitats. Magnitude of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Shrubs; Edge effect; Habitat fragmentation; Seasonal scrub vegetation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000400018
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Dispersal syndromes related to edge distance in cerrado sensu stricto fragments of central-western Brazil BABT
Jardim,André Vitor Fleuri; Batalha,Marco Antônio.
The main selective forces affecting the fruiting strategies are related to the environment in which plants occur. As a savanna, microclimatic conditions should not vary in relation to distance from edge in cerrado sensu stricto fragments. Thus, we postulated that the importance of different dispersal syndromes would not vary towards the fragment core. Our aim was to test in four cerrado sensu stricto fragments in central Brazil whether the absolute density of anemo-, auto-, and zoochorous individuals varied in relation to edge distance. According to results, the absolute density of anemo-and autochorous individuals did not vary, whereas those of zoochorous individuals increased with edge distance, pointing out that there were other factors rather than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Central-western Brazil; Cerrado; Dispersal; Edge effect.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500014
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Earthworm assemblages in an ecotone between forest and arable field and their relations with soil properties. Repositório Alice
ZEITHAML, J.; PIZL, V.; SKLENICKA, P..
Abstract ? The objective of this work was to assess the effects of a forest-field ecotone on earthworm assemblages. Five sites (blocks) differing in the type of crop rotation used in the field were studied in Central Bohemia, Czech Republic. In each block, sampling was carried out in seven parallel rows perpendicular to a transect from a forest (oak or oak-pine) to the centre of a field, both in spring and autumn 2001?2003. Individual rows were located in the forest (5 m from the edge), in the forest edge, and in the field (at 5, 10, 25, 50 and 100 m distances from the forest edge). The density and biomass of earthworms were lowest in the forest, increased markedly in the forest edge, decreased again at 5 or 10 m distance from the forest edge and then...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Landscape mosaic; Edge effect; Lumbricidae.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/660841
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Earthworm assemblages in an ecotone between forest and arable field and their relations with soil properties PAB
Zeithaml,Josef; Pižl,Václav; Sklenička,Petr.
The objective of this work was to assess the effects of a forest-field ecotone on earthworm assemblages. Five sites (blocks) differing in the type of crop rotation used in the field were studied in Central Bohemia, Czech Republic. In each block, sampling was carried out in seven parallel rows perpendicular to a transect from a forest (oak or oak-pine) to the centre of a field, both in spring and autumn 2001-2003. Individual rows were located in the forest (5 m from the edge), in the forest edge, and in the field (at 5, 10, 25, 50 and 100 m distances from the forest edge). The density and biomass of earthworms were lowest in the forest, increased markedly in the forest edge, decreased again at 5 or 10 m distance from the forest edge and then continuously...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Landscape mosaic; Lumbricidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800018
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Effects of environmental conditions associated to the cardinal orientation on the reproductive phenology of the cerrado savanna tree Xylopia aromatica (Annonaceae) Anais da ABC (AABC)
Camargo,Maria Gabriela G.; Souza,Regina M.; Reys,Paula; Morellato,Leonor P.C..
The Brazilian cerrado has undergone an intense process of fragmentation, which leads to an increase in the number of remnants exposed to edge effects and associated changes on environmental conditions that may affect the phenology of plants. This study aimed to verify whether the reproductive phenology of Xylopia aromatica (Lam.) Mart. (Annonaceae) differs under different light conditions in a cerrado sensu stricto (a woody savanna) of southeastern Brazil. We compared the reproductive phenology of X. aromatica trees distributed on east and south cardinal faces of the cerrado during monthly observations, from January 2005 to December 2008. The east face had a higher light incidence, higher temperatures and canopy openness in relation to south face. X....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado savanna; Edge effect; Fragmentation; Reproductive phenology; Synchrony.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300019
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Environment heterogeneity and seasonal effects in ground-dwelling ant (Hymenoptera: Formicidae) assemblages in the Parque Estadual do Rio Doce, MG, Brazil Neotropical Entomology
Coelho,Igor R.; Ribeiro,Sérvio P..
This work aimed to explore the response of ant species assemblage to contrasting types of forests in a semideciduous stationary rainforest, in the Parque Estadual do Rio Doce, South Eastern Brazil. We compared antropomorphic borders of this park and natural ecotones, such as lake margins continuous with forests, as well as preserved forests far from ecotones. We investigated whether ground-dwelling ant species richness, abundance and composition would change according to forest types and ecotones. We expected greater species richness in interior tall forest, compared with low forest or ecotone habitats. In addition, we tested the effect of climate seasonality on ant assemblages found in each studied vegetation type. Each forest type was surveyed based on a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alpha diversity; Beta diversity; Edge effect; Functional groups; Atlantic rainforest.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000100004
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Global-Scale Patterns of Forest Fragmentation Ecology and Society
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, “small” scale) to 59,049 km 2 (243 x 243 pixels, “large” 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
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Lidar-based assessment of forest edge effects across a degraded landscape in the Brazilian Amazon. Repositório Alice
SANTOS, M. N. dos; PINAGÉ, E. R.; LONGO, M.; ARAUJO, L. S. de; ADAMI, M.; MORTON, D.; KELLER, M..
Forest fragmentation divides forest areas into smaller discontinuous fragments, increasing the forest edge area that experiences different environmental conditions from interior areas [1]. According to one study, logging and deforestation generate ~32,000 and 38,000 km of new forest edge each year in the Brazilian Amazon [2]. Nearly 20% of the world?s forests are within 100m of agriculture, urban, or other non-forest land uses [3]. Forest edges suffer changes in microclimate, with reduced moisture and increased variability of temperature compared to the forest interiors. In addition, winds cause greater structural damage near the forest ends and affect other ecological processes such as pollination, seed dispersal, nutrient cycling and carbon storage. The...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Edge effect; Forest degradation; Airborne lidar; Amazon.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1034397
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Quantitative features of Cedrela odorata L. wood (Meliaceae) Rev. Bras. Bot.
Luchi,Agnes E..
Cedrela odorata L. (Meliaceae) occurs in the Atlantic forest, Amazon rain forest, riparian forest of the country, and wetlands, which demand species adapted to their water conditions. Studies in ecological wood anatomy demonstrated that weather factors' variations have direct influence on the wood anatomical structure and that the fragmentation of the natural habitats is a direct cause of the edge effect which alters the abiotic aspects of the location, interfering consequently in its vegetation. A comparative analysis of 20 anatomical quantitative features of the wood structure was performed in populations of Cedrela odorata growing inside and on the edge of the swamp forest and granulometric analysis was made on the soil. The quantitative data were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Swamp forest; Wood anatomy.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000300013
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The effect of fragmentation on phlebotomine communities (Diptera: Psychodidae) in areas of ombrophilous forest in São Luís, state of Maranhão, Brazil Neotropical Entomology
Azevedo,PCB; Lopes,GN; Fonteles,RS; Vasconcelos,GC; Moraes,JLP; Rebêlo,JMM.
The aim of this study was to determine whether an edge effect could be observed in the structure and composition of phlebotomine assemblages in five forest fragments on São Luís Island. The study also investigated whether there were any differences in species along the forest edge-to-interior gradient and in species richness and abundance between the fragments studied. To capture the insects a transect was defined in each fragment, and eight light traps were set up at 15 m intervals from the edge. Phlebotomines were found in all fragments, and a total of 2972 specimens (1188 males and 1784 females) belonging to 24 species were collected. Of these, the most abundant was Lutzomyia antunesi (Coutinho), followed by Brumptomyia avellari (Costa Lima), L....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Gradient biodiversity; Sandfly.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000200018
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The effects of fragmentation on Araucaria forest: analysis of the fern and lycophyte communities at sites subject to different edge conditions Acta Botanica
Silva,Vinícius Leão da; Schmitt,Jairo Lizandro.
Edge effects impact species richness and composition as a result of environmental changes caused by fragmentation. This study analyzed edge effects on a community of terrestrial ferns and lycophytes in an Araucaria forest in Brazil at sites subjected to differing edge conditions: (1) a site bordering a road running through the interior of a conservation unit, and (2) a site bordering an agricultural property. Twelve 10 × 10 m plots were selected at the edge and in the interior of each site, and accounted for a total of 48 plots. The edges had lost their characteristic floristic identity, suggesting that many species are sensitive to variations in environmental conditions. The edge effect had a negative impact on species richness as shown by the greater...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Environmental change; Microclimate; Mixed rain forest; Soil.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200223
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The influence of Ditylenchus (Nematoda) galls and shade on the fluctuating asymmetry of Miconia fallax (Melastomataceae) Ecología austral
Alves-Silva,Estevão.
Fluctuating asymmetry (FA) can be defined as small, random deviations from bilateral symmetry in structures that are bilaterally symmetrical and can estimate a population's inability to buffer its growth against perturbations of environmental origins. Another important issue about FA is whether biotic factors may also induce stress in organisms. Therefore, in this study I aimed to investigate the influence of both the abiotic (light exposure) and biotic (Ditylenchus sp. galls) factors accounting for increased FA in Miconia fallax leaves. Galls are known as parasites and a major cause of leaf stress. Additionally, since M. fallax is a pioneer plant species, individuals in the shade were supposed to present high levels of FA relative to plants on the edges...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effect; Light exposure; Pioneer plant; Cerrado.
Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2012000100006
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Tree mortality, recruitment and growth in a bamboo dominated forest fragment in southwestern Amazonia, Brazil Biota Neotropica
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
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