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Registros recuperados: 71
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Animal Dispersal in Fragmented Habitat: Measuring Habitat Connectivity, Corridor Use, and Dispersal Mortality Ecology and Society
Brooker, Lesley; CSIRO Sustainable Ecosystems; lesley.brooker@csiro.au; Brooker, Michael; CSIRO Wildlife and Ecology; M.Brooker@per.dwe.csiro.au; Cale, Peter; CSIRO Wildlife and Ecology; P.Cale@per.dwe.csiro.au.
We used a spatially explicit dispersal simulation to generate movement frequencies and distances for comparison with real dispersal frequencies collected in the field from two habitat-specific, sedentary bird species. The relationship between these two data sets allowed us to (1) test the hypothesis that the study species used corridor routes during dispersal; (2) measure the degree of reliance on corridor continuity; (3) estimate the rate of dispersal mortality with respect to distance traveled, and (4) give examples of how the model can be used to assess habitat connectivity with respect to similarly behaved species. We found that Blue-breasted Fairy-wrens and White-browed Babblers both used corridor routes during dispersal. Blue-breasted Fairy-wrens...
Tipo: Peer-Reviewed Reports Palavras-chave: Animal dispersal; Blue-breasted Fairy-wren; Dispersal model; Dispersal mortality; Fragmentation; Habitat connectivity; Malurus pulcherrimus; Pomatostomus superciliosus; Spatially explicit dispersal; Vegetation corridors; White-browed Babbler..
Ano: 1999
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Anti-predator behaviour of Sahamalaza sportive lemurs, Lepilemur sahamalazensis, at diurnal sleeping sites Naturalis
Seiler, M.; Schwitzer, C.; Holderied, M..
In response to predation pressure by raptors, snakes, and carnivores, primates employ anti-predator behaviours such as avoiding areas of high predation risk, cryptic behaviour and camouflage, vigilance and group formation (including mixedspecies associations), and eavesdropping on other species’ alarm calls. After detecting a predator, primates can produce alarm calls, show predator-specific escape strategies or even mob the predator. It remains unclear how solitary nocturnal primates respond to diurnal predation pressure while they sleep or rest. The aim of this study was to investigate the diurnal anti-predator behaviour of the nocturnal and solitary Sahamalaza sportive lemur, Lepilemur sahamalazensis, which regularly rests in exposed locations. We...
Tipo: Article / Letter to the editor Palavras-chave: Critically endangered; Nocturnal primates; Fragmentation; Playback experiments; Predator-specific strategy; 42.84.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/475370
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Araceae of Grumari restinga: contribution to the conservation of the flora of Rio de Janeiro State, Brazil Acta Botanica
Calazans,Luana S.B.; Valadares,Rodrigo Theófilo; Sakuragui,Cassia Mônica; Lopes,Rosana Conrado.
ABSTRACT This study surveyed species of the family Araceae in Grumari restinga, located in the metropolitan region of the city of Rio de Janeiro, Brazil. We aimed to: i) evaluate the contribution of a single locality (Grumari restinga) to regional conservation (Rio de Janeiro State) of Araceae; and ii) compare the distribution of species of Araceae among restingas of the state. We calculated the extent of occurrence and the area of occupancy in the entire state for eight species of Araceae found in Grumari,and performed a similarity analysis among restingas. Our data demonstrate that the extent of occurrences for Anthurium augustinum, A. coriaceum and A. maricense are influenced by Grumari because this area is the boundary of their known distribution in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation status; Fragmentation; Inventory; Phylogenetic stock; Species distribution.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100055
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Avifauna em florestas tropicais fragmentadas: indicadores da sustentabilidade em Usinas Hidrelétricas Ciências Agrárias
Andrade, Fabiano Timóteo de; Fisch, Simey Thury Vieira; Fortes Neto, Paulo; Batista, Getulio Teixeira.
As florestas tropicais brasileiras em especial a floresta Atlântica e Amazônica foram e continuam sendo alvos constantes de diversas ações antrópicas humanas, que ocasionaram a redução de seus territórios ou ainda sua total fragmentação. Um dos dados mais alarmantes é a perda de sua biodiversidade, que em muitas situações sequer foi conhecida, o que demanda a preocupação com a manutenção sustentável, de forma que várias espécies ainda possam sobreviver. Através de levantamentos na literatura especializada com o tema “o uso de biondicadores na qualidade ambiental em florestas tropicais”, foram elencados os mais utilizados para esse tipo de avaliação com enfoque na avifauna, uma vez que a mesma responde positiva ou negativamente a qualquer fator que altere...
Tipo: Article Palavras-chave: Fragmentação; Biodiversidade; Ambientes antroporizados; Biodiversity; Fragmentation.
Ano: 2011 URL: http://hdl.handle.net/2315/171
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Calling patterns of Western purple-faced langurs (Mammalia: Primates: Cercopithecidea: Trachypithecus vetulus nestor) in a degraded human landscape in Sri Lanka Naturalis
Eschmann, C.; Moore, R.; Nekaris, K.A.I..
The study of calling patterns is a useful non-invasive method for determining population densities and the taxonomic relationships of rare or cryptic animal species. The Western purple-faced langur Trachypithecus vetulus nestor, endemic to Sri Lanka’s lowland rainforests, is severely impacted by forest fragmentation, with most remaining populations living almost completely in home gardens. Due to their shy nature, little is known about the behaviour of this subspecies; analysing the regular loud calls emitted by these langurs could allow for improvement of census techniques, clarification of their taxonomy, and an understanding of the impact of forest destruction on their behaviour. In 2007, we recorded the calling patterns of five male T. v. nestor at...
Tipo: Article / Letter to the editor Palavras-chave: Bioacoustics; Taxonomy; Colobinae; South Asia; Fragmentation; 42.84.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/280454
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Composition of mixed-species bird flocks in forest fragments of southern Brazil Rev. Bras. Zool.
Brandt,Cláudia S.; Hasenack,Heinrich; Laps,Rudi R.; Hartz,Sandra Maria.
The present study aimed to evaluate the composition of mixed-species bird flocks in a fragmented landscape of the Atlantic Forest in southern Brazil. We recorded 117 species in 218 mixed-species flocks. The correspondence analysis showed two distinct groups of fragments according to degree of connectivity with other fragments. The percentage of original cover surrounding a sampled fragment area up to a ratio of 2.5 and 1 km was the variable that presented highest correlation with the formation of different composition of mixed-species bird flocks, followed by altitude. Based on these results, we concluded that, in landscapes with low levels of fragmentation, the composition of mixed flocks reflects the local species pool. Thus, future studies comparing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Bird community; Ecological interactions; Fragmentation; Mixed-species flocks.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300013
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Conservation value of a native forest fragment in a region of extensive agriculture BJB
CHIARELLO,A. G..
A survey of mammals and birds was carried out in a semi-deciduous forest fragment of 150 ha located in a zone of intensive agriculture in Ribeirão Preto, State of São Paulo, south-eastern Brazil. Line transect sampling was used to census mammals and birds during six days, totalling 27.8 km of trails and 27.8 hours of observation. Twenty mammal species were confirmed in the area (except bats and small mammals), including rare or endangered species, such as the mountain lion (Puma concolor), the maned wolf (Chrysocyon brachyurus), and the ocelot (Leopardus pardalis). The brown capuchin monkey (Cebus apella) and the black-tufted-ear marmoset (Callithrix penicillata) were found frequently, suggesting high population density in the fragment. Regarding the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avifauna; Conservation; Fragmentation; Mammals; São Paulo.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200007
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Cumulative Effects of Barriers on the Movements of Forest Birds Ecology and Society
St. Clair, Colleen Cassady; University of Alberta; cstclair@ualberta.ca.
Although there is a consensus of opinion that habitat fragmentation has deleterious effects on animal populations, primarily by inhibiting dispersal among remaining patches, there have been few explicit demonstrations of the ways by which degraded habitats actually constrain individual movement. Two impediments are primarily responsible for this paucity: it is difficult to separate the effects of habitat fragmentation (configuration) from habitat loss (composition), and conventional measures of fragmented habitats are assumed to be, but probably are not, isotropic. We addressed these limitations by standardizing differences in forest cover in a clearly anisotropic configuration of habitat fragmentation by conducting a homing experiment with three species...
Tipo: Peer-Reviewed Reports Palavras-chave: Banff National Park; Golden-crowned Kinglet; Red-breasted Nuthatch; Yellow-rumped Warbler; Barriers; Connectivity; Corridor; Forest cover; Fragmentation; Habitat loss; Movement of forest birds; Roads.
Ano: 2001
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Defining Conservation Priorities Using Fragmentation Forecasts Ecology and Society
Wear, David; U.S. Forest Service; dwear@fs.fed.us; Pye, John; U.S. Forest Service; jpye@fs.fed.us; Riitters, Kurt; U.S. Forest Service; kriiitters@fs.fed.us.
Methods are developed for forecasting the effects of population and economic growth on the distribution of interior forest habitat. An application to the southeastern United States shows that models provide significant explanatory power with regard to the observed distribution of interior forest. Estimates for economic and biophysical variables are significant and consistent with theory. Forecasts of interior forest based on the population and economic growth projected for the region are displayed by ecological section and province and by metropolitan statistical area (MSA). Loss of interior forests is expected to be especially high in certain ecological sections, including the southern Appalachian Piedmont in North and South Carolina, the Gulf prairies...
Tipo: Peer-Reviewed Reports Palavras-chave: Fragmentation; Interior forest; Land use forecasts; North Carolina; South Carolina; Florida; Texas.
Ano: 2004
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Desenvolvimento de método por CLUE-EM-EM para detecção de adulterantes em café. Repositório Alice
MARTINS, V. C.; GODOY, R. L. de O.; GOUVÊA, A. C. M. S.; SANTIAGO, M. C. P. de A.; COUTO, C. C.; FREITAS-SILVA, O..
2016
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Fraudes; Identificação; Fragmentação; Alta resolução; Frauds; Identification; Fragmentation; High resolution.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1059092
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Detecting Critical Scales in Fragmented Landscapes Ecology and Society
Keitt, Timothy; State University of New York at Stony Brook; Timothy.Keitt@StonyBrook.Edu; Urban, Dean L; Duke University; deanu@pinus.env.duke.edu; Milne, Bruce T; University of New Mexico; bmilne@sevilleta.unm.edu.
We develop methods for quantifying habitat connectivity at multiple scales and assigning conservation priority to habitat patches based on their contribution to connectivity. By representing the habitat mosaic as a mathematical "graph," we show that percolation theory can be used to quantify connectivity at multiple scales from empirical landscape data. Our results indicate that connectivity of landscapes is highly scale dependent, exhibiting a marked transition at a characteristic distance and varying significantly for organisms with different dispersal behavior. More importantly, we show that the sensitivity and importance of landscape pattern is also scale dependent, peaking at scales associated with the percolation transition. In addition, the...
Tipo: Peer-Reviewed Reports Palavras-chave: Connectivity; Conservation in fragmented landscapes; Dispersal; Fragmentation; Habitat connectivity vs. dispersal distance; Landscape; Landscape graphs; Metapopulation; Percolation; Quantifying habitat connectivity at multiple scales; "stepping stone" patch; Strix occidentalis lucida..
Ano: 1997
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Diet of Monodelphis glirina (Mammalia: Didelphidae) in forest fragments in southern Amazon Rev. Bras. Zool.
Castilheiro,Welvis Felipe Fernandes; Santos Filho,Manoel dos.
The current study aimed to evaluate the diet of Monodelphis glirina (Wagner, 1842) in forest fragments of Alta Floresta, located in the south of the Amazon, state of Mato Grosso. The diet was determined by the analysis of the stomach contents from 57 subjects sampled between May and September 2009. Nine food categories were present: Coleoptera, Orthoptera, Hymenoptera, Diplopoda, Nematoda, seeds, miscellaneous, hair and bait leftovers (banana and peanut butter). Coleoptera was the category eaten most frequently, rating 50% of abundance and 91.22% of occurrence. "Seeds" were the least abundant (0.11%) and rated 1.75% in occurrence, probably because seeds are easy to digest. The size of the fragments negatively and significantly influenced the amount of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coleoptera; Food items; Fragmentation; Insectivore.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000300001
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Distribution and spatial configuration of holm oak woodlands in the Montesinho/Nogueira site, Portugal IPB - Escola Superior Agrária
Dias, Rui; Azevedo, João.
Holm oak (Quercus rotundifolia) is wide spread within the West Mediterranean region. In Portugal, it is distributed across the interior of the country but woodlands of this species are currently rare. Historical factors explain most of the regression of holm oak to areas not suitable for agriculture where woodlands of this species persist in spite of very frequent wild fires. With the purpose of identifying physical factors related to the maintenance of holm oak woodlands in fire prone landscapes, we studied the distribution and spatial configuration of holm oak remnant patches in the Montesinho/Nogueira Natura 2000 Site (PTCON0002), Northeast of Portugal. We mapped holm oak woodlands from aerial photography and...
Tipo: ConferenceObject Palavras-chave: Holm oak; Quecus rotundifolia; Fragmentation; Landscape.
Ano: 2008 URL: http://hdl.handle.net/10198/3860
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Distribution pattern of herbivorous insects in a remnant of Brazilian Atlantic Forest Neotropical Entomology
Barbosa,Veralucia S.; Leal,Inara R.; Iannuzzi,Luciana; Almeida-Cortez,Jarcilene.
In this study we selected three habitats that correspond to a light gradient, and consequently a proportion of pioneer plant species gradient edges, trails and forest core and described their herbivorous insect assemblage. We tested five hypothesis about the herbivorous assemblage: (1) there is a different distribution of abundance and richness of order between habitats, (2) species similarity between habitats is smaller than within habitat, (3) in forest edge the herbivores are more abundant than in trails and interior of the forest, (4) in nuclear areas herbivore richness and diversity are higher than in the trails and edge, and (5) the abundance and richness of herbivores are different between seasons. Herbivorous were sampled during November 2000 - May...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fragmentation; Herbivorous insect assemblage; Herbivory; Insect diversity; Plant defense; Plant-insect interaction.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000500001
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Dung beetle (Coleoptera, Scarabaeidae) assemblage of a highly fragmented landscape of Atlantic forest: from small to the largest fragments of northeastern Brazilian region Rev. Bras. entomol.
Salomão,Renato P.; Iannuzzi,Luciana.
Human activities in tropical forests are the main causes of forest fragmentation. According to historical factor in deforestation processes, forest remnants exhibit different sizes and shapes. The aim of the present study was to evaluate the dung beetle assemblage on fragments of different degree of sizes. Sampling was performed during rainy and dry season of 2010 in six fragments of Atlantic forest, using pitfall traps baited with excrement and carrion. Also, we used two larger fragments as control. We used General Linear Models to determine whether the fragments presented distinguished dung beetle abundance and richness. Analysis of Similarities and Non-Metric Multidimensional Scaling were used to determine whether the dung beetle assemblage was grouped...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fragmentation; Habitat change; Scarabaeidae.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262015000200126
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Dung decomposition and associated beetles in a fragmented temperate forest RChHN
BUSTAMANTE-SÁNCHEZ,MARCELA A.; GREZ,AUDREY A.; SIMONETTI,JAVIER A..
Habitat fragmentation may result in changes in species number and population abundance among habitats that differ in area, structure, or edge characteristics. These changes, in turn, may result in alterations in ecosystem process such as decomposition of organic matter. Through an experimental approach, we compared the beetles assemblages associated with dung and decomposition of cow feces in a continuous portion of Maulino forest, forest fragments and in pine plantations that surround this forest and forest remnants. Abundance and richness of dung-associated beetles were lower in forest fragments compared to the continuous forest and pine plantations. However, dung decomposition was similar in these three habitats. Beetle abundance, species richness and...
Tipo: Journal article Palavras-chave: Temperate forest; Fragmentation; Insects; Decomposition.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100009
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Edge effect on vascular epiphytes in a subtropical Atlantic Forest Acta Botanica
Bianchi,Juliana Santos; Kersten,Rodrigo de Andrade.
Forest fragmentation affects biological communities by reducing habitat and increasing edges, thus reducing the effective size of the habitable zones. The subtropical atlantic Araucaria forest, typical on the southern Brazil, in some regions has been reduced to less than 1% of its original size lasting only in small isolated fragments. This study aimed to analyse the impact the edge has on vascular epiphyte ensemble in a remnant of Araucaria forest. We surveyed 40 host trees in four transects: one at the edge; and three at 15, 30 and 60 m from the edge. On each host tree we estimated the epiphyte biomass, using four size classes. We compared the transects using Jackknife estimator of absolute species number, diversity indices, non-metric multi-dimensional...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Disturbed areas; Araucaria forest; Subtropical Atlantic Forest; Fragmentation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100012
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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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Elevated Levels of Herbivory in Urban Landscapes: Are Declines in Tree Health More Than an Edge Effect? Ecology and Society
Christie, Fiona J; University of Sydney; christie@bio.usyd.edu.au; Hochuli, Dieter F; University of Sydney; dieter@bio.usyd.edu.au.
Urbanization is one of the most extreme and rapidly growing anthropogenic pressures on the natural world. Urban development has led to substantial fragmentation of areas of natural habitat, resulting in significant impacts on biodiversity and disruptions to ecological processes. We investigated the levels of leaf damage caused by invertebrates in a dominant canopy species in urban remnants in a highly fragmented urban landscape in Sydney, Australia, by assessing the frequency and extent of chewing and surface damage of leaves in urban remnants compared to the edges and interiors of continuous areas of vegetation. Although no difference was detected in the frequency of leaves showing signs of damage at small, edge, and interior sites, small sites suffered...
Tipo: Peer-Reviewed Reports Palavras-chave: Urban landscapes; Herbivory; Invertebrates; Urbanization; Remnant vegetation; Fragmentation; Leaf damage; Australia.
Ano: 2005
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Environmental structure and relationships in the setting of natural water springs in a Lower Highland Seasonal Forest in Brazilian South Ciência Rural
Floss,Paulo Alfonso; Longhi,Solon Jonas; Costa,Malcon do Prado; Floss,Elzira Cecília Serafini.
ABSTRACT: The aim of this research was to characterize an environmental structure in the setting of tree natural water springs in a Lower Highland Seasonal Forest, and to verify the relationship between community demography and soil variables as subsidies for species identification in riparian forest recovery programs in similar environments. The research was carried out in the National Forest of Chapecó, located in the west of the state of Santa Catarina in the southern region of Brazil. For this, three water springs were demarcated, where 26 plots of 200m² in each were allocated. All individuals with diameter at 1.30m of soil height ≥5.0cm were measured. Soil samples (0 to 20cm depth) were collected in the plots for chemical and physical analysis. To...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Riparian Forest; Atlantic Forest; Fragmentation; Edaphic Variables; Forest Recovery.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100301
Registros recuperados: 71
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