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| Registros recuperados: 12 | |
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| Bogaert, Jan; University of Antwerp; jan.bogaert@ua.ac.be. |
| The direct correspondence between landscape fragmentation and its effects is still the subject of debate. Many widely accepted hypotheses are not supported by experiments. The issue of fragmentation measurement is addressed here. To predict the effects of fragmentation, it is essential to quantify the pattern of fragmentation. Despite the increased use of spatial analysis and available measures, experts have not yet reached an agreement on how to measure patterns of fragmented landscapes and, thus, unambiguous translation of experimental findings into conservation or management guidelines is hampered. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Fragmentation; Landscape metric; Spatial pattern. |
| Ano: 2003 |
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| 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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| Lobry, Jeremy; Lepage, Mario; Rochard, Eric. |
| Detecting changes in animal communities suggests that a reference situation exists. It is a particularly difficult task in estuarine environments that are complex and fluctuate with time. Effects of human pressures are difficult to assess due to the scarcity or even the lack of evaluation and monitoring systems. In order to detect anomalies in the functioning of the system and to identify effects of perturbations upon populations and communities, it is necessary to analyse the dynamics in order to infer a reference state. This work aims to describe an approach based on K-Tab analyses and allows to define an average situation called "compromise" which is then compared to a single year of data. In this situation, the Gironde estuary, which has been monitored... |
| Tipo: Text |
Palavras-chave: Fish and shrimp assemblages dynamics; Gironde estuary; Correspondence analysis; Spatial pattern; STATIS. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1989.pdf |
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| Petitgas, Pierre; Masse, Jacques; Bourriau, Paul; Beillois, Pierre; Bergeron, Jean-pierre; Delmas, Daniel; Herbland, Alain; Koueta, Noussithe; Froidefond, Jean-marie; Santos, Maria. |
| The spatial pattern in hydro-plankton and fish distributions and their relationship were analysed based on the spring 2000 fisheries acoustic survey. The importance of this survey was that it was a multi-disciplinary platform which collected an extensive set of parameters in the hydro-plankton leading to a potentially finer description of hydro-plankton conditions and fish habitats. More than 50 variables were measured on a grid of stations, in four compartments of the ecosystem: hydrology, nutrients, primary producers and meso-zooplankton. First, a joint analysis of all hydro-plankton compartments was performed using multiple factor analysis (MFA). The method was used to estimate a compromise factorial space common to all compartments in which the... |
| Tipo: Text |
Palavras-chave: Fish environment relationship; Hydro plankton; Habitats; Multiple factor analysis; Spatial pattern. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3961.pdf |
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| Orvain, Francis; Lefebvre, Sebastien; Montepini, J.; Sebire, M.; Gangnery, Aline; Sylvand, B.. |
| Intertidal flats of the estuarine macro-intertidal Baie des Veys (France) were investigated to identify spatial features of sediment and microphytobenthos (MPB) in April 2003. Gradients occurred within the domain, and patches were identified close to vegetated areas or within the oyster-farming areas where calm physical conditions and biodeposition altered the sediment and MPB landscapes. Spatial patterns of chl a content were explained primarily by the influence of sediment features, while bed elevation and compaction brought only minor insights into MPB distribution regulation. The smaller size of MPB patches compared to silt patches revealed the interplay between physical structure defining the sediment landscape, the biotic patches that they contain,... |
| Tipo: Text |
Palavras-chave: Benthic diatoms; Benthos; Coastal ecosystems; Intertidal flats; Baie des Veys; Normandie; Spatial pattern; Geostatistics; Kriging. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00088/19945/17598.pdf |
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| Shi, Fei; Chu, Jin-long; Gu, Kang-kang. |
| On the basis of connotation of urbanization, by using SPSS factor analysis and cluster analysis, we establish index system of urbanization development level and conduct quantitative analysis on development level of urbanization in 17 prefecture-level city of Anhui Province, in order to find out the differentiation pattern of regional space of urbanization development in Anhui Province based on these. The results show that Anhui’s difference of urbanization gradient is prominent. Classification of three clusters shows that the pattern of status quo of urbanization development in Anhui Province is “dual-nucleus” and “two-stretches”; classification of five clusters show that the pattern of status quo of urbanization development in Anhui Province is... |
| Tipo: Journal Article |
Palavras-chave: Urbanization level; Regional differentiation; Spatial pattern; Anhui Province; China; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/113496 |
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| HAY,JOHN D.; BIZERRIL,MARCELO X.; CALOURO,ARMANDO M.; COSTA,ELIZABETH M.N.; FERREIRA,ANAMARIA A.; GASTAL,MARIA L.A.; GOES JUNIOR,CÍCERO D.; MANZAN,DAGOBERTO J.; MARTINS,CLÁUDIO R.; MONTEIRO,JOICE M.G.; OLIVEIRA,SÉRGIO A.; RODRIGUES,MARCELO C.M.; SEYFFARTH,JOÃO A.S.; WALTER,BRUNO M.T.. |
| O padrão de agrupamento espacial de três espécies arbóreas, Caryocar brasiliense, Pterodon pubescens e Sclerolobium paniculatum, e duas espécies de palmeiras, Syagrus comosa e S. flexuosa, nativas do cerrado, foi investigado usando três métodos de variância entre parcelas. Os dados foram coletados em uma área de cerrado sensu strictu da Fazenda Água Limpa da Universidade de Brasília, em Brasília, DF, em 128 parcelas contíguas de 5 x 8 m cada. Em cada parcela, foram procurados todos os indivíduos das espécies, anotando o número encontrado e suas alturas. Os dados foram tabelados e analisados usando as técnicas de variância entre blocos de parcelas (BQV), variância móvel entre blocos de parcelas (TTLQV) e variância entre parcelas pareadas (PQV), tanto para... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Spatial pattern; Quadrat-variance methods. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000300008 |
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| Bianchini,Edmilson; Garcia,Cristina C.; Pimenta,José A.; Torezan,José M.D.. |
| Size structure and spatial arrangement of 13 abundant tree species were determined in a riparian forest fragment inParaná State, South Brazil (23"16'S and 51"01'W). The studied species were Aspidosperma polyneuron Müll. Arg., Astronium graveolens Jacq. and Gallesia integrifolia (Spreng) Harms (emergent species); Alseis floribunda Schott, Ruprechtia laxiflora Meisn. and Bougainvillea spectabilis Willd. (shade-intolerant canopy species); Machaerium paraguariense Hassl, Myroxylum peruiferum L. and Chrysophyllum gonocarpum (Mart. & Eichler ex Miq.) Engl. (shade-tolerant canopy species); Sorocea bonplandii (Baill.) Bürger, Trichilia casaretti C. Dc, Trichilia catigua A. Juss. and Actinostemon concolor (Spreng.) Müll. Arg. (understory small trees... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diameter structure; Ecological groups; Forest fragment; Seasonal semideciduous forest; Spatial pattern. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300012 |
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| Registros recuperados: 12 | |
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