|
|
|
| Registros recuperados: 39 | |
|
|
| Almoussawi, Ali; Lenoir, Jonathan; Jamoneau, Aurélien; Hattab, Tarek; Wasof, Safaa; Gallet‐moron, Emilie; Garzon‐lopez, Carol X.; Spicher, Fabien; Kobaissi, Ahmad; Decocq, Guillaume; Collins, Beverly. |
| Questions Forest fragmentation affects biodiversity locally (α diversity) and beyond — at relatively larger scales (γ diversity) — by increasing dispersal and recruitment limitations. Yet, does an increase in fragmentation affect the relationship between α and γ diversity and what can we learn from it? Location Northern France. Methods We surveyed 116 forest patches across three fragmentation levels: none (continuous forest); intermediate (forest patches connected by hedgerows); and high (isolated forest patches). Plant species richness of both forest specialists and generalists was surveyed at five nested spatial resolutions across each forest patch: 1 m2; 10 m2; 100 m2; 1,000 m2; and total forest patch area. First, we ran log‐ratio models to quantify the... |
| Tipo: Text |
Palavras-chave: Agricultural landscapes; Alpha diversity; Anthropogenic disturbances; Community assembly; Dispersal limitations; Gamma diversity; Habitat conservation strategies; Habitat fragmentation; Local-regional richness relationship; Metacommunity dynamics. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00592/70438/68577.pdf |
| |
|
|
| Nemésio,André; Silveira,Fernando A. |
| Male orchid bees were attracted to chemical baits and collected in nine Atlantic Forest fragments in southeastern Brazil. Fragments differed in size and shape. Three additional sites were also sampled in a nearby large fragment. Three hypothetical core areas of each fragment were measured as the total area minus an area of 50, 100, and 200-m-wide perimeter. Abundance and richness were not correlated with either fragment size or ratio area/perimeter, but were positively correlated with the size of core areas. These results suggest that orchid bee conservation requires the preservation of the fragments with the largest possible core areas. Neither size nor shape alone (area/perimeter ratio) seemed to be good indicators of the value of a given fragment for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Conservation; Euglossine; Habitat fragmentation. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400014 |
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| Bastos,Heitor B.; Gonçalves,Evonnildo C.; Ferrari,Stephen F.; Silva,Artur; Schneider,Maria Paula C.. |
| We genotyped 15 microsatellite loci in order to evaluate the effects of habitat fragmentation, caused by flooding of the Tucuruí reservoir, on the genetic structure of Alouatta belzebul in eastern Amazonia. The analysis included two populations sampled in 1984, representing both margins of the Tocantins river, and three populations sampled 18 years later. Minimal differences in the diversity levels between present-day (Ho = 0.62-0.69 and A R = 6.07-7.21) and pre-flooding (Ho = 0.60-0.62 and A R = 6.27-6.77) populations indicated there was no significant loss of genetic variability, possibly because of successful management strategies applied during the flooding. The changes observed were limited to shifts in the composition of alleles, which presumably... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alouatta belzebul; Amazonia; Conservation; Genetic structure; Habitat fragmentation. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400027 |
| |
|
|
| 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 |
|
| |
|
|
| THOMAZINI, M. J.; THOMAZINI, A. P. de B. W.. |
| O presente trabalho foi conduzido visando comparar a diversidade e composição de insetos em áreas de floresta contínua, fragmentada, floresta secundária e pastagem no sudeste acreano. Coletas mensais de insetos foram realizadas com armadilha luminosa e rede entomológica, entre abril de 1999 e março de 2000, no interior de um fragmento florestal e em uma área de floresta secundária e pastagem adjacentes ao fragmento, no município de Rio Branco, AC. Também foram realizadas amostragens mensais de cupins com iscas de papelão, em todas as áreas citadas e em uma outra área de floresta contínua, localizada no município de Capixaba, AC. Estimou-se a diversidade das áreas usando-se o índice de diversidade de Margalef. Foram aplicadas medidas de fauna... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Floresta contínua; Floresta fragmentada; Termites; Western Amazon; Amazônia Ocidental; Acre; Capixaba (AC); Rio Branco (AC); Termitas; Amazonia Occidental; Comunidades de insectos; Bosques secundarios; Pastizales; Fragmentación de hábitats; Plagas de las plantas; Sondeo de la Población Actual.; Entomofauna; Pastagem; Floresta secundária; Floresta; Levantamento populacional; Cupim; Praga de planta; Isoptera.; Pastures.; Insect communities; Current population survey; Habitat fragmentation; Secondary forests; Plant pests. |
| Ano: 2002 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/496050 |
| |
|
| |
|
|
| 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 |
|
| |
|
|
| 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 |
|
| |
|
|
| SALIMON, C. I.; AMARAL, E. F. do; ANDERSON, L. O.; SILVA JUNIOR, C. H. L.; BROWN, I. F.. |
| O sudoeste da Amazônia era, até a metade do século 20, predominantemente coberto por uma floresta ombrófila dominada por bambus, com manchas de floresta ombrófila densa. Devido a diversos fatores sócio-econômicos e ondas de ocupação, a região foi sendo transformada e hoje somente 29% do leste acreano apresenta cobertura florestal nativa. Esta mudança de cobertura do solo tem implicações diretas em vários aspectos que vão desde a conservação da biodiversidade, utilização sustentável de recursos naturais e também na prestação de serviços ecossistêmicos, como precipitação e temperatura atmosférica. A fragmentação da paisagem chegou ao seu ponto atual, onde tem-se que metade da floresta remanescente encontra-se sob efeito de borda (a menos de 120 m da borda),... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Fragmentação florestal; Cambio de uso de la tierra; Plantas de cobertura; Deforestación; Fragmentación de hábitats; Granjas de demostración; Reservatorios de carbono; Fazenda Experimental Catuaba; Universidade Federal do Acre; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental.; Cobertura do Solo; Uso da Terra; Desmatamento; Impacto Ambiental; Campo Experimental; Carbono; Estoque.; Land use change; Ground cover plants; Deforestation; Environmental impact; Habitat fragmentation; Demonstration farms; Carbon sinks.. |
| Ano: 2020 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1128541 |
| |
|
| |
|
|
| Caires,Heloisa S.; Souza,Cleide R.; Lobato,Débora N. C.; Fernandes,Marília N. S.; Damasceno,Júnio S.. |
| ABSTRACT Roadways and road traffic modify landscapes, posing a threat to the conservation of species in different biomes. The aim of the present study was to analyze roadkill records of wild mammals and to compare the results to findings from 37 other studies conducted in Brazil, to evaluate the richness and diversity of threatened species in different eco-regions of the country. This study was conducted between June 2007 and June 2008, along 60 km of the inter-state highway BR-364, which connects the municipalities of Ouro Preto d’Oeste and Presidente Médici in the state of Rondônia (northern Brazil). Two hundred twenty roadkills were recorded involving 13 species of mammals. Cingualata, Pilosa and Carnivora were the most represented orders. The most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental impact; Habitat fragmentation; Hotspots; Threatened wildlife. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100236 |
| |
|
|
| Zanuncio,José Cola; Tavares,Wagner de Souza; Ramalho,Francisco de Sousa; Leite,Germano Leão Demolin; Serrão,José Eduardo. |
| Abstract: The objective of this work was to evaluate spatial and temporal distributions of Sarsina violascens (Lepidoptera: Noctuidae: Lymantriinae) in two Eucalyptus cloeziana plantations, one with native vegetation strips (WNVS) and another without them (ONVS). Adults were collected with light traps, which were installed: inside an area of native vegetation (Cerrado), 100 m from the edge; at the contact zone between the native vegetation area and the E. cloeziana plantation; inside the E. cloeziana plantation, 250 m from the edge; at the central part of the native vegetation strip, around 500 m from the edge (WNVS) or in the contact zone between two E. cloeziana compartments (ONVS); and inside the E. cloeziana plantation, 500 m from the edge. The number... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus cloeziana; Sarsina violascens; Habitat fragmentation; Integrated pest management; Plant species richness; Population dynamics.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000600703 |
| |
|
|
| GREZ,AUDREY A.; ZAVIEZO,TANIA; REYES,SUSANA. |
| Habitat loss and fragmentation are considered as the main causes of biodiversity depression. Habitat loss implies a reduction of suitable habitat for organisms, and habitat fragmentation is a change in the spatial configuration of the landscape, with the remaining fragments resulting more or less isolated. Recent theory indicates that the effects of habitat loss are more important than those of habitat fragmentation, however there are few experimental studies evaluating both processes separately. To test the effects of habitat fragmentation per se on the abundance, species richness and diversity of epigeal coleopterans, 15 (30 x 30 m) alfalfa micro-landscapes, distributed in three blocks, were created. On twelve of them, 84 % of the habitat was removed,... |
| Tipo: Journal article |
Palavras-chave: Habitat fragmentation; Habitat loss; Micro-landscapes; Diversity of epigeal beetles. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300013 |
| |
|
|
| Hames, Ralph S.; Cornell Laboratory of Ornithology; rsh5@cornell.edu; Lowe, James D.; Cornell Laboratory of Ornithology; jdl6@cornell.edu; Swarthout, Sara Barker; Cornell Laboratory of Ornithology; sb65@cornell.edu; Rosenberg, Kenneth V.; Cornell Laboratory of Ornithology; kvr2@cornell.edu. |
| Ubiquitous human-caused changes to the environment act as multiple stressors for organisms in the wild, and the effects of these stressors may be synergistic, rather than merely additive, with unexpected results. However, understanding how focal organisms respond to these stressors is crucial for conservation planning for these species. We propose a paradigm that alternates extensive, broadscale data collection by volunteer collaborators to document patterns of response, with intensive fine-scale studies by professional researchers, to elucidate the processes underlying these patterns. We demonstrate this technique, building on our existing work linking patterns of population declines in the Wood Thrush (Hylocichla mustelina) to synergistic effects of acid... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Multiple scales; Synergistic effects; Citizen science; Habitat fragmentation; Acid rain; Forests; Anthropogenic change; Soil; Calcium; Invertebrates. |
| Ano: 2006 |
|
| |
|
| |
|
|
| Shine, Richard; University of Sydney; rics@bio.usyd.edu.au; Lemaster, Michael; ; lemasterm@mail.science.orst.edu; Wall, Michael; ; mwall@bio.usyd.edu.au; Langkilde, Tracy; ; langkild@bio.usyd.edu.au; Mason, Robert; ; masonr@science.oregonstate.edu. |
| If animals avoid road surfaces or are unable to follow conspecific trails across such surfaces, previously continuous populations may be fragmented. We gathered data on the effects of a small (4-m wide) gravel road on the behavior and trail-following abilities of garter snakes (Thamnophis sirtalis parietalis) in Manitoba, central Canada. As expected, the road surface had less vegetation cover, a more open canopy and, thus, higher incident radiation than did the surrounding grassland. Contrary to expectations, however, substrate temperatures were lower on the road than in its surrounds, because of the higher reflectivity of the road's surface. On a nearby asphalt road, substrate temperatures were relatively high on the road surface only in the evening, as... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Behavior; Connectivity; Habitat fragmentation; Pheromones; Reproduction; Reptile. |
| Ano: 2004 |
|
| |
| Registros recuperados: 39 | |
|
|
|
