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Registros recuperados: 8
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Arthropod responses to the experimental isolation of Amazonian forest fragments Rev. Bras. Zool.
Vasconcelos,Heraldo L.; Bruna,Emilio M..
Arthropods are the most diverse and abundant group of animals found in tropical lowland forests, and in light of ongoing global change phenomena, it is essential to better understand their responses to anthropogenic disturbances. Here we present a review of arthropod responses to forest deforestation and fragmentation based on studies conducted at the Biological Dynamics of Forest Fragments Project (BDFFP), located in central Amazonia. These studies involved a wide range of arthropod groups. All but one of the studies evaluated changes in total species number or species density in relation to fragment size, (i.e. area effects), and one-third also evaluated edge effects. Our review indicates that almost every arthropod group studied showed some kind of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Area effects; Edge effects; Insects; Secondary succession; Tropical forest conservation.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000600003
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Biodiversity conservation in agricultural landscapes: the importance of the matrix Repositório Alice
TAVARES, P. D.; UZEDA, M. C.; PIRES, A. dos S..
Agricultural matrices can lead to landscape homogenization, culminating in losses of biodiversity and ecosystem services. Agricultural management is determinant for developing conservation strategies. In this review, we discuss the influence of the agricultural matrix on biodiversity at different scales. Intensive agriculture under agrochemicals and synthetic fertilizers aggravates forest fragmentation processes, compromising conservation habitats. On the other hand, managed matrixes with greater agricultural biodiversity and reduced synthetic inputs tend to favor species? persistence. There is discord regarding the best model to conserve biodiversity in agricultural landscapes, but the land sharing system increases the landscape heterogeneity, ensures...
Tipo: -- Palavras-chave: Land sharing; Land sparing; Edge effects.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113630
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Changes in plant community diversity and composition across an edge between Araucaria forest and pasture in South Brazil Rev. Bras. Bot.
Fontoura,Simone Benedet; Ganade,Gislene; Larocca,João.
This work investigated how richness, abundance, composition and structure of woody and herbaceous vegetation were altered by the proximity of an edge between Araucaria forest and pasture in South Brazil. Herbaceous and woody species including seedlings were surveyed in 42 plots of 5 × 5 m randomly placed at the following distances: 5 and 50 m from the edge into the pasture and 0, 25, 50, 100 and 250 m from the edge into the forest. There was a significant increase in vegetation cover, richness and abundance of woody species, woody seedlings and herbaceous plants at the edge (0 m). These variables, in general, decreased from 25 to 50 m from the edge into the forest in comparison to the forest interior. Few seedlings of woody plants were able to establish...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Edge effects; Herbaceous vegetation; Seedling diversity; Tree species composition; Woody plants richness.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000100008
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Distribution of frogs in riparian areas of an urban forest fragment in Central Amazonia Biota Neotropica
Tsuji-Nishikido,Bruno Minoru; Menin,Marcelo.
This study aimed to evaluate how environmental variables (width of valley, stream size, forest edge distance, and leaf-litter depth) affect the abundance and richness of species of frog species in riparian areas of an urban forest fragment in Central Amazonia. The study was conducted at the campus of the Universidade Federal do Amazonas, Manaus, Brazil, between May 2008 and April 2009, when three nocturnal and diurnal samples were taken from ten plots. A total of 17 species belonging to seven families were registered. The number of species recorded per plot varied from seven to 14. We detected a relationship between the edge distance and richness: the plots with lower richness were located near the fragment border. The variables had no significant effect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abundance; Anura; Edge effects; Diversity; Environmental variables.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200007
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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 de periódico Palavras-chave: Fragmentação florestal; Borda florestal; Idade da borda; Acre; Western Amazon; Amazonia Ocidental; Análisis estadístico; Madera tropical; Bosques tropicales; Cubierta vegetal; Dinámica poblacional; Efectos de borde; Fragmentación de hábitats; Incendios forestales; Inventario forestal; Mortalidad; Regeneración natural.; 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..
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1072940
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Influence of linear habitats in mammal activity: test of the travel lanes hypothesis BJB
COELHO,L. H. L..
Mammal activity was monitored by a track-analysis method, in a 180 ha forest fragment. Three 1 km transects, each one with six tracking stations were established: one along a road side and one along a stream bank ("travel lanes") and one in the forest interior. Transects were monitored for six weeks through the months of September, October and beginning of November 1996. The activity of six morph-species of mammals was accessed, providing 251 records. Results of linear and non-linear habitats were compared, to test the "travel lanes" hypothesis, which predicts higher mammal activity in linear habitats. No statistical evidence supporting the hypothesis was found. The roadside transect showed the lowest mammal activity, whereas the stream side transect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mammal activity; Travel lanes; Edge effects; Forest fragment.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100007
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Migration of coccinellids to alfalfa fields with varying adjacent vegetation in Central Chile Ciencia e Investigación Agraria
Grez,Audrey A; Torres,Constanza; Zaviezo,Tania; Lavandero,Blas; Ramírez,Marcelo.
Permanent and permeable edges, where natural enemies can feed, overwinter or easily cross over, should enhance the early arrival of these predators to crops. We evaluated the abundance and species richness of coccinellids migrating to alfalfa fields adjacent to Eucalyptus, a mix of false acacia, blackberries and poplar (F-B-P), vineyards, corn and annual vegetables. From September 2007 to May 2008, we captured coccinellids in three sticky traps (2.64 m²) placed at the borders between alfalfa fields and adjacent vegetation. We also estimated the abundance of aphid populations in the alfalfa fields, by counting the number of individuals per alfalfa stem in spring, summer and autumn. We collected 90,396 coccinellids from 14 species. Neither total abundance...
Tipo: Journal article Palavras-chave: Agroecosystems; Conservation biological control; Edge effects; Ladybeetles; Migration; Natural enemies.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200011
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Ocorrência de Erythmelus tingitiphagus (Hymenoptera: Mymaridae) na bordadura de talhões de seringueira vizinha ao cerrado e mata ripária em Itiquira, MT. Repositório Alice
SANTOS, R. S.; SILVA, J. M. da; ANDRADE NETO, R. de C..
O efeito de borda e a preservação da vegetação de entorno ou vegetação nativa próximas aos monocultivos atuam diretamente na manutenção dos inimigos naturais na área, promovendo aumento ou diminuição populacional destes agentes de controle biológico. Neste sentido, o objetivo do trabalho foi verificar a ocorrência do parasitoide de ovos Erythmelus tingitiphagus, em árvores da bordadura em dois talhões comerciais de seringueiras do clone PR 255 vizinhos ao Cerrado e Mata Ripária na fazenda da empresa "Plantações Edouard Michelin Ltda.", Itiquira, MT. Quinzenalmente oito folhas maduras foram coletadas em cinco árvores da bordadura de cada um dos talhões, processadas em laboratório e analisadas sob estereoscópio após cinco dias. O número de parasitoides...
Tipo: Artigo de periódico Palavras-chave: Efeito de borda; Lace bugs; Chinche de encaje; Erythmelus tingitiphagus; Rubber tree; Plantações Edouard Michelin Ltda; Itiquira (MT); Mato Grosso; Control biológico; Efectos de borde; Plagas de plantas.; Parásitos; Vegetação nativa; Praga de planta; Controle biológico; Mosca de renda; Parasito; Caucho; Percevejo de Renda.; Edge effects; Plant pests; Biological control; Tingidae; Parasites; Leptopharsa heveae..
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/912038
Registros recuperados: 8
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