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Registros recuperados: 9
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Análise do padrão de distribuição espacial da araucária (Araucaria angustifolia) em algumas áreas no Estado do Paraná, utilizando a função K de Ripley. Repositório Alice
ANJOS, A. dos; MAZZA, M. C. M.; SANTOS, A. C. M. C. dos; DELFINI, L. T..
Avaliou-se o padrão de distribuição espacial da araucária (Araucaria angustifolia) em algumas áreas do Estado do Paraná com a função K de Ripley, considerando caso univariado, com e sem marcas (diâmetro à altura do peito – DAP - e altura das árvores). Os resultados indicaram uma alta variação no padrão de distribuição espacial das árvores de Araucaria angustifolia em todas as tipologias avaliadas.
Tipo: Artigo de periódico Palavras-chave: Estrutura espacial; Conífera; Processo pontual; Spatial structure; Point processes; Univariate marked point process.; Araucária Angustifólia.; Araucária; Conifers..
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/286899
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Ecosystem spatial structure revealed by integrated survey data ArchiMer
Petitgas, Pierre; Huret, Martin; Dupuy, Christine; Spitz, Jerome; Authier, Matthieu; Romagnan, Jean-baptiste; Doray, Mathieu.
Integrated marine survey series such as PELGAS provide comprehensive geo-referenced data over large sea areas in major ecosystem components with defined biological resolution and spatio-temporal sampling scale. These data enable to develop product at different levels of biological organization and spatial scale that are useful for ecosystem integrated assessments. Using the PELGAS integrated data series, we applied a generic procedure made of several steps to identify and map ecologically coherent ecosystem spatial units in the Bay of Biscay. First, the data were interpolated on a common spatial grid and organized as a time series of matrices containing at each time the variables as columns and the grid cell values as rows. The multi-table analysis method...
Tipo: Text Palavras-chave: Integrated surveys; Ecosystems; Spatial structure; Multi-factor analysis; Bay of Biscay; Pelagic.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00403/51402/51977.pdf
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Evaluation of corn production parameters and their spatial relatioship with chemical attributes of the soil. Repositório Alice
MARTINS, A. L. da S.; MOURA, E. G. de; CAMACHO-TAMAYO, J. H..
The characterization of the soil spatial variability allows a better understanding of the relationships between the soil attributes and the environment. The objective of the study was to evaluate the spatial variability of corn production parameters and their relationship with soil chemical attributes. The study was carried out in the municipality of Miranda do Norte (MA, Brazil) in a Typic Plinthaquults. A mesh of 113 points was designed, taking samples at regular distances of 10 m, determining pH, organic material, P, K, Ca, Mg, and exchangeable acidity. The corn production parameters were ear weight, weight of 100 grains, and yield. The results were analyzed by means of descriptive statistics and geostatistical techniques. The pH and the weight of 100...
Tipo: Separatas Palavras-chave: Spatial structure; Zea Mays L.; Kriging; Precision agriculture..
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/921474
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Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa) Ciencia e Investigación Agraria
Carrasco,Basilio; Eaton,Lafayette; Letelier,Luis; Díaz,Carole; García-Gonzáles,Rolando.
Heterozygote deficiencies in natural populations of outbreeding tree species are common and thought to be due mainly to biparental inbreeding. Inbreeding is believed to be caused by family structure within populations, a product of limited seed dispersal and probably limited pollen dispersal. Although both theory and simulation studies predict that structure should be apparent where trees are isolated by distance, most studies of structure in natural populations have detected only a weak spatial genetic structuring. In this contribution, we compare the use of spatial autocorrelation methodology and F statistics with the concept of relatedness to examine the spatial genetic structure in the natural population of a native southern beech and to explore the...
Tipo: Journal article Palavras-chave: Genetic structure; Spatial structure; Raulí; Spatial autocorrelation.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300014
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Interaction between fish and fishing vessels in the Javanese purse seine fishery ArchiMer
Potier, Michel; Petitgas, Pierre; Petit, Didier.
The purse-seiners of the Java Sea use light and fish aggregating devices (FAD) to concentrate and catch small pelagic fish (Decapterus sp., Amblygaster sirm, Sardinella gibbosa). This sets a question about the interaction between fish and fishing vessels. Relevant estimates of fishing mortality and fishing effort require an understanding of this interaction. To gain information on this relationship, acoustic surveys were performed on the fishing grounds and the present paper analyses these data. Using acoustic surveys, the fish density was measured and the number of schools was counted per sea surface unit. The fishing vessels were located by radar. Acoustic data were stratified into two groups, one where fishing vessels were present and the other where...
Tipo: Text Palavras-chave: Pêche; Acoustique; Structures spatiales; Pélagiques; Mer de Java; Indonésie; Fishing operation; Echo surveys; Spatial structure; Pelagic fish; Java Sea; Indonesia.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00188/29884/28343.pdf
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Local environmental controls of Atlantic Forest tree community assembly on a coastal continental island in southeastern Brazil Acta Botanica
Nettesheim,Felipe Cito; Garbin,Mário Luís; Pereira,Marcos Gervasio; Araujo,Dorothy Sue Dunn de.
ABSTRACT Tropical forests with high species diversity are commonly found in rugged montane areas. We investigated causes of local tropical forest tree community assembly on a continental island with heterogeneous terrain. We recorded tree community (absolute species abundance), topography, soil, litter and location in 40 sampling units on two opposite sides of the island with similar heterogeneous terrain. We used transformation based Redundancy Analyses and variation partitioning to determine the contribution of environment (topography, soil and litter), spatial structure (geographic location and Moran Eigenvector Maps) and the shared effects of these to explain community assembly. The environment made a significant contribution to explain tree community...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community composition; Community structure; Floristics; Neutral; Niche; Soil; Spatial structure; Topography; Tropical forest.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100088
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Spatial Trends of Genetic Variation of Domestic Ruminants in Europe Inra
Laloë, D.; Moazami-Goudarzi, K.; Lenstra, J.A.; Marsan, P.A.; Azor, P.; Baumung, R.; Bradley, D.G.; Bruford, M.W.; Canon, J.; Dolf, G.; Dunner, S.; Erhardt, G.; Hewitt, G.; Kantanen, J.; Obexer-Ruff, G.; Olsaker, I.; Rodellar, C.; Valentini, A.; Wiener, P.; INRA, Institut National de la Recherche Agronomique (FRA); European Cattle Genetic Diversity Consortium (INT).
The introduction of livestock species in Europe has been followed by variousgenetic events, which created a complex spatial pattern of genetic differentiation. Spatialprincipal component (sPCA) analysis and spatial metric multidimensional scaling (sMDS)incorporate geography in multivariate analysis. This method was applied to threemicrosatellite data sets for 45 goat breeds, 46 sheep breeds, and 101 cattle breeds fromEurope, Southwest Asia, and India. The first two sPCA coordinates for goat and cattle, andthe first sPCA coordinate of sheep, correspond to the coordinates of ordinary PCAanalysis. However, higher sPCA coordinates suggest, for all three species, additionalspatial structuring. The goat is the most geographically structured species, followed...
Tipo: Journal Article Palavras-chave:  cattle; Sheep; Goat; Diversity; Spatial structure; PCA; SPCA; Multidimensional; Scaling; Moran’s I.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201171b6cbcd&uri=/notices/prodinra1/2011/06/
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Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China Scientia Agricola
Hu,Wei; Shao,Ming An; Wang,Quan Jiu; Fan,Jun; Reichardt,Klaus.
The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate the spatial variability of these properties on a steep slope of the Loess Plateau in northwest China. A 9600 m² area was systematically sampled in a grid of 106 points spaced 10 m x 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, -6, -3, 0 cm) at each sample point. Classical and geo-statistical methods were used for data analysis. The results indicated that the variation of Gardner's a and hydraulic conductivities at all applied pressure heads was moderate and the heterogeneity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Disc infiltrometer; Steep sloping land; Pressure head; Spatial structure.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300007
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Stability of spatial structures of demersal assemblages: a multitable approach ArchiMer
Gaertner, Jean-claude; Chessel, Daniel; Bertrand, Jacques.
The present work is based on a set of bottom trawl surveys performed in the Gulf of Lions between 1983 and 1992. A new method which couples the STATIS multitable approach with the logic of correspondence analysis (CoA) is proposed to study the stability of spatial organization of demersal assemblages in terms of species composition. This CoA version of STATIS has provided a clear representation of the stable part of the spatial structure of the assemblages. In addition, it gave an insight into the interannual variations of the distribution of each population around the reference structure. Our results showed that the demersal assemblages of the Gulf of Lions exhibited strong spatial structuring, mainly orientated along a bathymetric gradient. This gradient...
Tipo: Text Palavras-chave: Assemblage de poissons; Chalutage; Analyse multitableaux; Méditerranée; Stabilité; Structure spatiale; Fish assemblage; Trawl surveys; Multitable analysis; Correspondence analysis; Mediterranean sea; Stability; Spatial structure.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-875.pdf
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