Consulta: subjectFacets:"Spatial analyses"
Registros recuperados: 4
Data/hora: 12/06/2024 10:18:34

Application of Moran Eigenvector Maps (MEM) to irregular sampling designs
Provedor de dados: 5
Autores: Brind'Amour, Anik; Mahevas, Stephanie; Legendre, Pierre; Bellanger, Lise.
Moran’s eigenvectors maps (MEM) are attractive mathematical objects as they are fairly simple to calculate and can be used in most studies of spatially-explicit data. There is, however, an aspect of MEM analysis that still requires some investigation: the effect of irregular sampling on their modeling performance. This study investigates empirically the behavior of MEMs under different irregularity schemes. It is focusing on simulated scenarios representing sampling designs frequently encountered in ecology. We advocate that MEMs can be computed and correctly used with data coming from irregularly designed sampling surveys, given some precautions. We suggest that when the sampling sites are equally spaced but do not cover the entire study area, the MEMs...
Tipo: Text
Palavras-chave: Autocorrelation; Irregular sampling; Sampling schemes; Spatial analyses; Statistical methods.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00444/55594/57224.pdf

From Data to End-to-End Models: 15 Years of Research to Describe the Dynamics of Exploited Marine Ecosystems in the Eastern Channel
Provedor de dados: 5
Autores: Marchal, Paul; Gasche, Loic; Girardin, Raphael; Le Pape, Olivier; Huret, Martin; Mahevas, Stephanie; Travers-trolet, Morgane; Vaz, Sandrine.
Considerable research has been conducted in the past 15 years around the Eastern English Channel ecosystem. Data collected since the 1970s on the biotic and abiotic compartments have been collated and mapped out in the mid-2000. This spatially explicit information formed a sound basis to improve knowledge on, and model, the functioning and dynamics of key ecosystem compartments, with a focus on flatfish species and fisheries and their interactions with other sectors of activity (aggregate extractions, maritime traffic). The more recent ongoing works are dedicated to the integration of those processes into several complementary end-to-end ecosystem models.
Tipo: Text
Palavras-chave: Eastern English Channel; Flatfish; Spatial analyses; Ecosystem modelling.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00293/40420/38946.pdf

Geographical distribution of the incubation period of coffee leaf rust in climate change scenarios
Provedor de dados: 86
Autores: Alfonsi,Waldenilza Monteiro Vital; Coltri,Priscila Pereira; Zullo Júnior,Jurandir; Patrício,Flávia Rodrigues Alves; Gonçalves,Renata Ribeiro do Valle; Shinji,Kaio; Alfonsi,Eduardo Lauriano; Koga-Vicente,Andrea.
Abstract: The objective of this work was to simulate the geographical distribution of the incubation period of coffee leaf rust in Coffea arabica, using data of two regional climate models, Eta-HadGEM2-ES and Eta-MIROC5. The scenario of high greenhouse gas emission (RCP 8.5 W m-2) was used for the states of Minas Gerais and São Paulo, Brazil, for current and future climate scenarios. The behavior of six different regression equations for incubation period (IP), available in the literature, was also analyzed as affected by data from the regional climate models. The results indicate the possibility of an increase in the affected area in the studied region, when the IP is less than 19 days, from 0.5% for Eta-MIROC5 to 14.2% for Eta-HadGEM2-ES. The severity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Hemileia vastatrix; Arabica coffee; Plant disease severity; Regional climate modelling; Spatial analyses.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102301

Geostatistics applied to swine facilities equipped with evaporative cooling system
Provedor de dados: 91
Autores: Abreu,Paulo G. de; Dalla Costa,Osmar A.; Feddern,Vivian; Morés,Nelson; Coldebella,Arlei; Ramos,Clóvis M. C.
ABSTRACT The purpose of this study was to evaluate the spatial variation of temperature, relative humidity and black globe humidity temperature (BGHT) index in growing-finishing swine facilities, with and without evaporative air cooler. The experiment was conducted in a 60 x 9 m facility containing 32 pens of 3.20 x 4.00 m each, divided into two sectors. The treatments were without evaporative air cooler (control) and with evaporative air cooler. Temperature and relative humidity data were collected weekly in two periods (morning and afternoon) at 32 different sampling points, encompassing the center of each pen and the outer perimeter of the facility. Animal performance variables were: feed intake, feed conversion, weight out of the nursery, slaughter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Spatial analyses; Environment conditions; Semivariogram.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001101014