Consulta: subjectFacets:"Spatio-temporal dynamics"
Registros recuperados: 6
Data/hora: 10/06/2024 06:38:44

Metodologia espaço-temporal aplicada ao mapeamento de paisagens em fazendas de gado de corte no Pantanal.
Provedor de dados: 14
Autores: SILVA, A. P. S.; BERGIER, I.; ABREU, U. G. P. de; NOGUEIRA, E.; OLIVEIRA, L. O. F. de; URBANETZ, C.; SILVA, J. C. B.; SILVA JUNIOR, C.
Este trabalho apresenta uma metodologia simples e bem conhecida de mapeamento espaço-temporal aplicada a paisagens de fazendas de produção de gado de corte no Pantanal. A área foco de estudo, a Fazenda São Bento, localizada na sub-região do Abobral, Estrada Parque, totaliza 9,2 mil hectares. Utilizou-se dados do satélite Landsat-5 de 1985 a 2011, entre junho e setembro, sendo selecionadas imagens livres de nuvens das bandas espectrais 3, 4 e 5 para o processamento digital e a classificação das paisagens da fazenda. As imagens foram inicialmente retificadas geométrica e radiometricamente, e a posteriori foi feita uma análise estatística por componentes principais. A identificação e a quantificação em área das paisagens da fazenda foram obtidas por...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Dinâmica espaço temporal; Gestão de paisagens; Cadastro ambiental rural; Área de uso restrito ou compartilhado; Spatio-temporal dynamics; Rural environmental register; Land sparing or sharing.; Landscape management.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1049770

Metrics for describing dyadic movement: a review
Provedor de dados: 5
Autores: Joo, Rocio; Etienne, Marie-pierre; Bez, Nicolas; Mahevas, Stephanie.
In movement ecology, the few works that have taken collective behaviour into account are data-driven and rely on simplistic theoretical assumptions, relying in metrics that may or may not be measuring what is intended. In the present paper, we focus on pairwise joint-movement behaviour, where individuals move together during at least a segment of their path. We investigate the adequacy of twelve metrics introduced in previous works for assessing joint movement by analysing their theoretical properties and confronting them with contrasting case scenarios. Two criteria are taken into account for review of those metrics: 1) practical use, and 2) dependence on parameters and underlying assumptions. When analysing the similarities between the metrics as...
Tipo: Text
Palavras-chave: Collective behaviour; Dyadic movement; Indices; Movement ecology; Spatio-temporal dynamics; Trajectories.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00475/58657/61156.pdf

A new application of principal response curves for summarizing abrupt and cyclic shifts of communities over space
Provedor de dados: 5
Autores: Auber, Arnaud; Travers-trolet, Morgane; Villanueva, Ching-maria; Ernande, Bruno.
There is a growing need to easily describe and synthesize the dynamics of ecosystems’ components in space and time. Most multivariate analyses provide ordination diagrams or biplots that are too cluttered to allow simple reading and are unfamiliar to most users. To overcome such difficulties, a novel application of principal response curves (PRCs) is proposed. Principal response curves are traditionally used to assess treatment effects on community structure measured repeatedly over time. In this new application, the tested factor and the repeated-observation axis are replaced by time and space, respectively. The georeferencing of sampling sites permits to produce an easy-to-read map that summarizes both the temporal dynamics of the community and the...
Tipo: Text
Palavras-chave: Fish communities; Multivariate analyses; Partial redundancy analysis; Spatial management tools; Spatio-temporal dynamics.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00413/52478/53266.pdf

Integrating taxon-based, trait-based and trophic-network approaches to study community dynamics in an exploited ecosystem, the Celtic Sea
Provedor de dados: 5
Autores: Merillet, Laurene.
Marine ecosystems face many pressures, the main ones being fishing and climate change. These pressures do not have the same consequences on the different facets of biodiversity, e.g. on taxa, traits and networks, and their study is necessary for the implementation of an ecosystem approach to fisheries. The Celtic Sea is a very important fishing area for European fisheries, with a specific richness greater than adjacent areas. Based on a time series from 2000 to 2016, I have studied the spatio-temporal dynamics of 101 species of the ecosystem. Over this period, taxonomic biodiversity was stable, and the importance of fishing as a structuring variable for communities decreased after 2009, and was lower than the environment (depth, chlorophyll a concentration...
Tipo: Text
Palavras-chave: Approche écosystémique des pêches; Dynamiques spatio-temporelles; Traits d’histoire de vie; Réseaux trophiques; Gestion des ressources; Ecosystem approach to fisheries; Spatio-temporal dynamics; Community ecology; Life-history traits; Food webs; Resource management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00666/77806/79980.pdf

Environment outweighs the effects of fishing in regulating demersal community structure in an exploited marine ecosystem
Provedor de dados: 5
Autores: Mérillet, Laurene; Kopp, Dorothee; Robert, Marianne; Mouchet, Maud; Pavoine, Sandrine.
Global climate change has already caused bottom temperatures of coastal marine ecosystems to increase worldwide. These ecosystems face many pressures, of which fishing is one of the most important. While consequences of global warming on commercial species are studied extensively, the importance of the increase in bottom temperature and of variation in fishing effort is more rarely considered together in these exploited ecosystems. Using a 17‐year time series from an international bottom‐trawl survey, we investigated co‐variations of an entire demersal ecosystem (101 taxa) with the environment in the Celtic Sea. Our results showed that over the past two decades, biotic communities in the Celtic Sea were likely controlled more by environmental variables...
Tipo: Text
Palavras-chave: Bottom trawl survey; Celtic Sea; Fishing effort; Marine resources; Spatio-temporal dynamics; Stability; STATICO multivariate analysis.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71150/69470.pdf

A three-dimensional view on biodiversity changes: spatial, temporal, and functional perspectives on fish communities in the Baltic Sea
Provedor de dados: 5
Autores: Frelat, Romain; Orio, Alessandro; Casini, Michele; Lehmann, Andreas; Merigot, Bastien; Otto, Saskia A.; Sguotti, Camilla; Moellmann, Christian.
Fisheries and marine ecosystem-based management requires a holistic understanding of the dynamics of fish communities and their responses to changes in environmental conditions. Environmental conditions can simultaneously shape the spatial distribution and the temporal dynamics of a population, which together can trigger changes in the functional structure of communities. Here, we developed a comprehensive framework based on complementary multivariate statistical methodologies to simultaneously investigate the effects of environmental conditions on the spatial, temporal and functional dynamics of species assemblages. The framework is tested using survey data collected during more than 4000 fisheries hauls over the Baltic Sea between 2001 and 2016. The...
Tipo: Text
Palavras-chave: Baltic Sea; Demersal fish community; Functional traits; Multivariate analysis; Spatio-temporal dynamics; Species distribution.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00475/58659/62410.pdf