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Abundância de microartrópodes do solo em fragmentos de mata com araucária no sul do Brasil Iheringia, Sér. Zool.
Duarte,Marcelo Maisonette.
The abundance of soil microarthropods from seven fragments of Araucaria Forest, Muitos Capões, Rio Grande do Sul, Brazil, was compared. The size of the fragments ranged from 0.25 ha to 35 ha, the two largest fragments are situated within the Aracuri Ecological Station and the remaining five are situated in a cattle ranching farm. In June 2000, three plots (10 m x 10 m) were established in the central area of each patch, and three soil cores (7 cm diameter x 6 cm deep) were taken per plot. The abundance of microarthropods in the upper six centimeters (soil + litter) varied between 63209 and 102704 ind.m-2, with oribatid mites (Acari, Cryptostigmata) being dominant in all fragments (between 46.9 % and 61.3 % of total individuals). Most microarthropod groups...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil microarthropods; Araucaria forest; Acari; Collembola; Habitat fragmentation.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000200008
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Avaliação da composição estrutural e biomassa viva acima do solo, em florestas sob efeito da fragmentação na Amazônia Ocidental. Infoteca-e
FIGUEIREDO, E. O.; PEREIRA, N. W. V.; WADT, L. H. de O..
O modelo de ocupação da Amazônia, implementado nas últimas décadas, pouco considerou as especificidades dos distintos ecossistemas florestais existentes na região. Quando se considera a dimensão territorial da Amazônia e os impactos decorrentes do desflorestamento e conseqüente processo de fragmentação de florestas, o fato ganha importância global. Este trabalho faz parte do projeto "Efeito do processo de fragmentação florestal na sustentabilidade de alguns ecossistemas periféricos aos eixos rodoviários no sudeste acreano", financiado pelo Programa Nacional de Diversidade Biológica (Pronabio), e foi desenvolvido num fragmento florestal localizado à margem direita da Rodovia Federal BR-364, km 30, sentido Rio Branco/Porto Velho, no município de Rio Branco,...
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Fragmentação florestal; Biomassa aérea; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Floresta tropical; Ecossistema; Degradação ambiental; Impacto ambiental; Biomassa; Carbono; Estoque; Tropical forests; Habitat fragmentation; Aboveground biomass; Carbon sinks; Environmental impact; Bosques tropicales; Fragmentación de hábitats; Biomasa aérea; Reservorios de carbono.
Ano: 2000 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/495836
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Behavioral Responses of Northern Leopard Frogs (Rana pipiens) to Roads and Traffic: Implications for Population Persistence Ecology and Society
Bouchard, Julie; Geomatics and Landscape Ecology Research Lab, Department of Biology, Carleton University; julie.bouchard@mail.mcgill.ca; Ford, Adam T.; Geomatics and Landscape Ecology Research Lab, Department of Biology, Carleton University; atford@gmail.com; Eigenbrod, Felix E; Geomatics and Landscape Ecology Research Lab, Department of Biology, Carleton University; felix.eigenbrod@gmail.com; Fahrig, Lenore; Geomatics and Landscape Ecology Research Lab, Department of Biology, Carleton University; lenore_fahrig@carleton.ca.
Tipo: Peer-Reviewed Reports Palavras-chave: Breeding dispersal; Habitat fragmentation; Highway; Migration; Movement; Road avoidance; Road mortality.
Ano: 2009
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Beyond Roadkill, Radiotracking, Recapture and FST—a Review of Some Genetic Methods to Improve Understanding of the Influence of Roads on Wildlife Ecology and Society
Simmons, Jody M; Monash University; Australian Centre for Biodiversity; jodymichellesimmons@yahoo.com.au; Sunnucks, Paul; Monash University; Australian Centre for Biodiversity; paul.sunnucks@sci.monash.edu.au; Taylor, Andrea C; Monash University; Australian Centre for Biodiversity; andrea.taylor@sci.monash.edu.au; van der Ree, Rodney; Australian Research Centre for Urban Ecology, Royal Botanic Gardens Melbourne; rvdr@unimelb.edu.au.
Habitat fragmentation continues to occur despite increasing evidence of its adverse effects on ecosystems. One of the major detrimental effects of roads and traffic is the creation of barriers or filters to the movement of wildlife, ultimately disconnecting some populations. Our understanding of the extent to which roads reduce the movement of biota is mostly based on field-based observational methods of inferring animal movement, and to a much smaller extent, on allele frequency-based genetic analyses. Field-based methods, as it is typically feasible to apply them, tend to be informative at fine temporal and spatial scales. Allele frequency-based genetic methods are informative at broad geographic scales but at timescales usually greater than recent...
Tipo: Peer-Reviewed Insight Palavras-chave: Barrier; Dispersal; Gene flow; Genotypic analyses; Habitat fragmentation; Road ecology.
Ano: 2010
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Changes in Mammalian Body Length over 175 Years—Adaptations to a Fragmented Landscape? Ecology and Society
Schmidt, Niels Martin; Royal Veterinary and Agricultural University; nms@kvl.dk; Jensen, Per Moestrup; Royal Veterinary and Agricultural University; pmj@kvl.dk.
The potential consequences of anthropogenic habitat fragmentation on species diversity and extinction have drawn considerable attention in recent decades. In many cases, traditional island biogeography theory has been applied to explain the observed patterns. Here, we propose that habitat fragmentation as a selective force can be traced in mammalian body length changes. By exploring historical sources, we are able to show that the body length of Danish mammals has altered over a period of 175 years, possibly in response to increasing habitat fragmentation. The rate of body length change was generally lowest in medium-sized mammals, and increased with both smaller and larger body mass. Small mammals have generally increased, whereas large mammals have...
Tipo: Peer-Reviewed Reports Palavras-chave: Body length; Habitat fragmentation; Island biogeography; Island rule; Mammalia; Reproductive capacity; Size-specific mortality; Traffic.
Ano: 2003
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Concomitant Patterns in Avian and Mammalian Body Length Changes in Denmark Ecology and Society
Schmidt, Niels Martin; Royal Veterinary and Agricultural University; nms@kvl.dk; Jensen, Per Moestrup; Royal Veterinary and Agricultural University; pmj@kvl.dk.
We gathered length data on 61 Danish breeding birds from the past 200 years, and related the pattern of change to present body mass and other ecological parameters. Body mass was the only parameter significantly correlated with the rate of change, and the emerging pattern in the rate of change followed the island rule. That is, smaller species have become larger and vice versa, while the medium-sized species remain essentially unchanged. The suggested optimal body mass was around 85 g. Though orders of magnitude lower, the pattern in avian body size change was similar to that of Danish mammals. Our analyses suggest that increasing habitat fragmentation leads to altered body size towards being medium-sized in Danish vertebrates. The changing landscape,...
Tipo: Peer-Reviewed Reports Palavras-chave: Body length; Habitat fragmentation; Island biogeography; Island rule; Aves; Reproductive output; Migration; Feeding category; Competition; Avoidance; Tolerance..
Ano: 2005
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Daily nest site use by the Siberian flying squirrel Pteromys volans orii in fragmented small woods OAK
浅利, 裕伸; 柳川, 久.
We studied the nest types used by Pteromys volans orii in two small, fragmented woods (2.1 ha and 3.1 ha) in Obihiro, Hokkaido from April 2005 to March 2006. Three nest types (cavity, nest box, drey) were used by eight flying squirrels. Each flying squirrel made use of two to eight nest-sites. The flying squirrels in our study area appear to have been restricted as to nest resources, since these woods are fragmented and small, they are surrounded by roads and fields. The preferred nests during snow-free and the snowy season were, respectively, cavity and nest box, and cavity and drey. We suggest that longer and more frequent use of nest boxes during the snow-free season might be related to rises in temperature and numbers of ectoparasites. The use of...
Palavras-chave: Habitat fragmentation; Nest site use; Obihiro; Pteromys volans orii; Small wood.
Ano: 2008 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4168
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Differential effects of habitat fragmentation on birds and mammals in Valdivian temperate rainforests RChHN
KELT,DOUGLAS A..
Four recent studies on Chilean vertebrates underscore the very different effects that habitat fragmentation may have under different conditions. In southern Chile, birds exhibited significant species-area relationships, whereas the more depauperate small mammal community did not. The avifauna of highly isolated rainforest remnants in Fray Jorge National Park (IV Región) presented steeper species-area relations than those in southern Chile, reminiscent of land-bridge islands after faunal relaxation. The small mammal results were unexpected but may reflect the reduced vagility and immigration potential of this group. Additionally, the inter-remnant matrix habitat may support large populations of only some species, allowing them to capitalize on resources...
Tipo: Journal article Palavras-chave: Habitat fragmentation; Valdivian temperate rainforest; Small mammals; Birds; Conservation.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400005
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Efeito de diferentes usos da terra nas características do solo no Estado do Acre. Infoteca-e
AMARAL, E. F. do; BROWN, I. F.; MELO, A. W. F. de..
O uso da terra na Amazônia está condicionado ao processo de fragmentação florestal. No Acre, o arco do desmatamento é constituído pela BR-364 e BR-317. Este trabalho tem como objetivo avaliar os efeitos do uso da terra nas características químicas e físicas do solo, em uma cronosseqüência de uso em uma área de grande fazendeiro no sudeste acreano. Foi conduzido na fazenda Ponteio, situada às margens da BR-317, no município de Capixaba, sendo georreferenciadas três unidades amostrais, caracterizando o gradiente de pressão antrópica: pasto, capoeira e floresta. Em cada unidade amostral foram retiradas informações sobre o histórico de uso e coletados dados referentes às seguintes características: densidade aparente, resistência do solo até 60 cm...
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Fragmentação florestal; Arco do Desmatamento; Rodovia BR-364; Rodovia BR-317; Fazenda Ponteio; Capixapa (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Uso da terra; Solo; Propriedade Físico-Química; Land use; Habitat fragmentation; Soil chemical properties; Soil physical properties; Uso de la tierra; Fragmentación de hábitats; Propiedades químicas del suelo; Propiedades fìsicas del suelo.
Ano: 2001 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/495274
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Effects of protected area downsizing on habitat fragmentation in Yosemite National Park (USA), 1864 – 2014 Ecology and Society
Golden Kroner, Rachel E.; Department of Environmental Science and Policy, George Mason University; Betty and Gordon Moore Center for Science, Conservation International; rachelelizabethgolden@gmail.com; Krithivasan, Roopa; Department of Geography, Clark University; rkrithivasan@clarku.edu; Mascia, Michael B.; Betty and Gordon Moore Center for Science, Conservation International; m.mascia@conservation.org.
Protected area downgrading, downsizing, and degazettement (PADDD) has been documented worldwide, but its impacts on biodiversity are poorly understood. To fill this knowledge gap, we reviewed historical documents to identify legal changes that altered the boundaries of Yosemite National Park. We identified two downsizes and five additions between 1905 and 1937 that reduced the size of Yosemite National Park by 30%. To examine the effects of these downsizing events on habitat fragmentation by roads, we compared protected, never-protected, and downsized lands at three spatial scales using four habitat fragmentation metrics: road density, fragment (land surrounded by roads) area-to-perimeter ratio, fragment area, and fragment density. In general, lands that...
Tipo: Peer-Reviewed Reports Palavras-chave: Downsizing; Governance; Habitat fragmentation; PADDD; Protected areas; Yosemite National Park.
Ano: 2016
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Effects of Roads and Traffic on Wildlife Populations and Landscape Function: Road Ecology is Moving toward Larger Scales Ecology and Society
van der Ree, Rodney; University of Melbourne; rvdr@unimelb.edu.au; van der Grift, Edgar A.; Alterra, Wageningen UR, Netherlands; edgar.vandergrift@wur.nl; Clevenger, Anthony P.; Western Transportation Institute, Montana State University, USA; apclevenger@gmail.com.
Tipo: Peer-Reviewed Reports Palavras-chave: Animal movement; Animal-vehicle collisions; Barrier effect; Ecological threshold; Gene flow; Habitat fragmentation; Mitigation; Population viability analysis; Road ecology; Road-effect zone; Traffic mortality; Traffic noise; Traffic volume; Transportation planning.
Ano: 2011
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Exploring the abundance-occupancy relationships for the Georges Bank finfish and shellfish community from 1963 to 2006 ArchiMer
Frisk, Michael G.; Duplisea, Daniel E.; Trenkel, Verena.
Abundance-occupancy (A-O) patterns were explored temporally and spatially for the Georges Bank finfish and shellfish community to evaluate long-term trends in the assemblage structure and to identify anthropogenic and environmental drivers impacting the ecosystem. Analyses were conducted for 32 species representing the assemblage from 1963 to 2006 using data from the National Marine Fisheries Service's annual autumn bottom trawl survey. For individual species, occupancy was considered the proportion of stations with at least one individual present, and abundance was estimated as the mean annual number of fish captured per station. Intraspecific relationships were estimated to provide information on utilization of space by a species. Multispecies...
Tipo: Text Palavras-chave: Abundance-occupancy relationships; Commercial catchability; Community ecology; Exploitation; Finfish; Fishing; Georges Bank; Habitat fragmentation; Hyperstability; Resilience; Shellfish.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00033/14397/14043.pdf
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Fire and edge effects in a fragmented tropical forest landscape in the southwestern Amazon. Repositório Alice
NUMATA, I.; SILVA, S. S.; COCHRANE, M. A.; OLIVEIRA, M. V. N. d'.
The Amazon holds the largest tropical rain forest formation in the world but this natural ecosystem has been altered by both anthropogenic and natural disturbances since the 1970s (Davidson et al., 2012). The Brazilian Amazon experienced the highest annual tropical deforestation rates until the mid-2000s when rates began to decline dramatically due to the government?s environmental law enforcement. Conversely, other forest disturbances, such as understory fire, selective logging, and fragmentation (Aragao et al., 2014; Arima et al., 2014) have gained more importance in terms of their impacts on remnant forests. The degree of forest degradation varies as functions of disturbance type, the intensity and frequency of disturbance events, and the time since...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fragmentação florestal; Borda florestal; Idade da borda; Acre; Amazônia Ocidental; Western Amazon; Amazonia Ocidental; Floresta tropical; Essência florestal; Incêndio florestal; Impacto ambiental; Dinâmica populacional; Mortalidade; Regeneração natural; Cobertura vegetal; Inventário florestal; Análise estatística; Tropical forests; Tropical wood; Forest fires; Environmental impact; Population dynamics; Mortality; Habitat fragmentation; Natural regeneration; Vegetation cover; Edge effects; Forest inventory; Statistical analysis; Bosques tropicales; Madera tropical; Incendios forestales; Mortalidad; Dinámica poblacional; Fragmentación de hábitats; Regeneración natural; Cubierta vegetal; Efectos de borde; Inventario forestal; Análisis estadístico.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1072940
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Genetic consequences of population subdivision: the marsupial Micoureus paraguayanus (Mammalia: Didelphimorphia) as a case study Rev. Bras. Zool.
Brito,Daniel.
Habitat fragmentation may cause population subdivision, affecting genetic variation, leading to heterozygosity loss and increased inbreeding, and contributing to population extinction. However, some genetic models have shown that under some conditions, population subdivision can favor heterozygosity and allelic diversity, and small populations may adapt to inbreeding. Here I investigate the relationship between population subdivision and genetic diversity for the marsupial Micoureus paraguayanus (Tate, 1931) using the program Vortex. Hypothetical populations of 100 and 2000 individuals were partitioned into 1, 2, 5 or 10 populations that were linked by varying rates of dispersal and also by sex-biased dispersal. Results suggested that heterozygosity and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic drift; Genetic load; Habitat fragmentation; Inbreeding; Metapopulation; Population viability analysis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400013
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Habitat Fragmentation and Native Bees: a Premature Verdict? Ecology and Society
Cane, James H; USDA-ARS; jcane@biology.usu.edu.
Few studies directly address the consequences of habitat fragmentation for communities of pollinating insects, particularly for the key pollinator group, bees (Hymenoptera: Apiformes). Bees typically live in habitats where nesting substrates and bloom are patchily distributed and spatially dissociated. Bee studies have all defined habitat fragments as remnant patches of floral hosts or forests, overlooking the nesting needs of bees. Several authors conclude that habitat fragmentation is broadly deleterious, but their own data show that some native species proliferate in sampled fragments. Other studies report greater densities and comparable diversities of native bees at flowers in some fragment size classes relative to undisrupted habitats, but find...
Tipo: Peer-Reviewed Reports Palavras-chave: Apoidea; Bees; Conservation; Diversity; Habitat fragmentation; Land-use change; Pollination; Pollinator; Statistics; Taxonomy.
Ano: 2001
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Mechanisms Affecting Population Density in Fragmented Habitat Ecology and Society
Tischendorf, Lutz; ELUTIS Modelling and Consulting Inc.; lutz.tischendorf@gmx.net; Grez, Audrey; Universidad de Chile; agrez@uchile.cl; Fahrig, Lenore; Carleton University; lfahrig@ccs.carleton.ca.
We conducted a factorial simulation experiment to analyze the relative importance of movement pattern, boundary-crossing probability, and mortality in habitat and matrix on population density, and its dependency on habitat fragmentation, as well as inter-patch distance. We also examined how the initial response of a species to a fragmentation event may affect our observations of population density in post-fragmentation experiments. We found that the boundary-crossing probability from habitat to matrix, which partly determines the emigration rate, is the most important determinant for population density within habitat patches. The probability of crossing a boundary from matrix to habitat had a weaker, but positive, effect on population density. Movement...
Tipo: Peer-Reviewed Reports Palavras-chave: Boundary crossing; Emigration; Habitat fragmentation; Immigration; Modeling; Movement; Population density; Simulation; Time scale.
Ano: 2005
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Modeling the Effect of Traffic Calming on Local Animal Population Persistence Ecology and Society
van Langevelde, Frank; Resource Ecology Group, Wageningen University; frank.vanlangevelde@wur.nl; Jaarsma, Catharinus F.; Land Use Planning Group, Wageningen University; rinus.jaarsma@wur.nl.
A steady growth in traffic volumes in industrialized countries with dense human populations is expected, especially on minor roads. As a consequence, the fragmentation of wildlife populations will increase dramatically. In human-dominated landscapes, typically minor roads occur in high densities, and animals encounter them frequently. Traffic calming is a new approach to mitigate negative impacts by reducing traffic volumes and speeds on minor roads at a regional scale. This leads to a distinction between roads with low volumes as being part of the traffic-calmed area, whereas roads with bundled traffic are located around this area. Within the traffic-calmed area, volumes and speeds can be decreased substantially; this is predicted to decrease the...
Tipo: Peer-Reviewed Reports Palavras-chave: Habitat fragmentation; Metapopulation theory; Mitigation; Road ecology; Traffic calming; Transportation planning.
Ano: 2009
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Orchid-bee fauna (Hymenoptera: Apidae: Euglossina) in two forest fragments in the state of Pará, Brazil. Repositório Alice
TANIGUCHI, M.; MAUES, M. M.; MOURA, T. do S. A. de..
2012
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Amazon; Habitat fragmentation; Apoidea; Pollination; Chemical baits.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/951570
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Photosynthetically active radiation under forest fragment and forest restoration systems in the Cerrado-Amazon ecotone, Mato Grosso State, Brazil. Repositório Alice
ZOLIN, C. A.; LULU, J.; TONINI, H.; ISERNHAGEN, I..
In this study we monitored the Photosynthetically Active Radiation (PAR) in four treatments of a Forest Restoration (FR) project, as well as inside a Native Forest (NF) and under Full Sun (FS) condition during 651 days, in Cerrado-Amazon ecotone, Brazil. The FR systems were established in December 2012 and consisted of a consortium of 16 native species with eucalyptus (T1) and with rubber trees (T2), both with artificial pruning (AP), and only native species with (T3) and without AP (T7), all with a density of ~800 ind.ha-1. The PAR data was acquired continuously with specific sensors coupled to automatic weather stations and data loggers, while tree height and shading were measured inside circular plots around the stations after four years of planting....
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Forest restoration systems; Photosynthetically active radiation; Habitat fragmentation.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1087249
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Population genetic structure of Attalea vitrivir Zona (Arecaceae) in fragmented areas of southeast Brazil. Repositório Alice
SANTOS, R. R. M.; CAVALLARI, M. M.; PIMENTA, M. A. S.; ABREU, A. G.; COSTA, M. R.; GUEDES, M. L..
Attalea vitrivir Zona (synonym Orbignya oleifera) is one of the six species of Arecaceae known as ?babassu?. This species is used to make cosmetics, food, and detergents due to the high concentration of oil in the seeds. It is found only in fragmented areas of southern Bahia State and northern Minas Gerais State, southeast Brazil, and this fragmentation has affected both its ecological and genetic characteristics. We evaluated the genetic diversity and population genetic structure of A. vitrivir in six areas of two different regions at the extremes of its geographical range, in order to gain a better understanding of the factors that affect the distribution and partitioning of its diversity. Nine inter simple sequence repeat (ISSR) markers amplified 74...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Attalea vitrivir; Babassu; Babaçú; População; Genética; Cerrado; Attalea speciosa; Habitat fragmentation; Population genetics.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1037318
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