Consulta: subjectFacets:"Ecological model"
Registros recuperados: 5
Data/hora: 06/06/2024 05:25:03

Réponse écophysiologique de l'huître creuse Crassostrea gigas à la variabilité spatio-temporelle des facteurs environnementaux. Etude par modélisation écologique
Provedor de dados: 5
Autores: Grangere, Karine.
The spatial and temporal variability in biotic and abiotic environmental factors influence the ecophysiological response of bivalves (growth, reproduction and survival). In this study, the physiological status of cultivated oysters in the Baie des Veys ecosystem was studied using an ecosystem model which simulates ecophysiological processes of oysters (growth, maintenance and reproduction) and environmental processes which control oyster responses (river inputs, meteorology, hydrodynamic). In order to assess the spatial and temporal scales of variability in this ecosystem, two modelling approaches were developed. Temporal variability from the seasonal to the inter-annual scale was studied using a box model. Results showed that the variability in...
Tipo: Text
Palavras-chave: Baie desVeys; Terrestrial inputs; Physiological state; Hydrodynamism; Oyster mortality; Primary production; Ecological model; Crassostrea gigas; Baie des Veys; Apports terrigènes; État physiologique; Hydrodynamisme; Mortalités d'huîtres; Productivité primaire; Modèles écologiques; Crassostrea gigas.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/these-6785.pdf

Modelling the biogeochemical cycles of elements limiting primary production in the English channel .2. Sensitivity analyses
Provedor de dados: 5
Autores: Hoch, T; Menesguen, Alain.
A general framework for an ecological model of the English Channel was described in the first of this pair of papers. In this study, it was used to investigate the sensitivity of the model to various factors: model structure, parameter values, boundary conditions and forcing variables. These sensitivity analyses show how important quota formulation for phytoplankton growth is, particularly for growth of dinoflagellates. They also stress the major influence of variables and parameters related to nitrogen. The role played by rivers and particularly the river Seine was investigated. Their influence on global English Channel phytoplanktonic production seems to be relatively low, even though nutrient inputs determine the intensity of blooms in the Bay of Seine....
Tipo: Text
Palavras-chave: English Channel; Sensitivity analyses; Ecological model.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00337/44791/44478.pdf

Modélisation du réseau trophique pélagique et de la production primaire en Manche
Provedor de dados: 5
Autores: Hoch, Thierry.
This paper deals with a model of the pelagic ecosystem in the English Channel The model takes into account nitrogen biogeochemical cycle explicitly and indirectly phosphorus, silicon and carbon ones. The pelagic ecosystem is described precisely, on the one hand with the help of three phytoplanktonic compartments, and the other by considering the microbial food web. Primary production appears to be mainly controlled by stratification and turbidity, except in the Bay of Seine where high terrestrial nutrient inputs generate a sharp enrichment. Moreover, the model allows some general ecological conclusions to be drawn. From the simulation, it appears that inorganic nitrogen in the water column is mainly produced by an intense recycling. In accordance with in...
Tipo: Text
Palavras-chave: Nitrogen fluxes; Primary production; Ecological model; English Channel; Flux d'azote; Production primaire; Modèle écologique; Manche.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-841.pdf

Biological characteristics of a hydrothermal edifice mosaic community
Provedor de dados: 5
Autores: Sarrazin, Jozee; Juniper, Sk.
This study defines the composition and biomass characteristics of 5 of 6 previously described faunal assemblages that form a mosaic community on hydrothermal sulfide edifices of the Juan de Fuca Ridge (northeast Pacific). Quantitative samples of each assemblage were acquired during 'ROPOS' Remote Operated Vehicle (ROV) dive programs in 1994 and 1996. Total abundance, and species richness, as well as wet and dry weights, were calculated for each assemblage, and sampled surface area was measured directly or from scaled images of sample scars. These data were used to compare species composition, richness and biomass of the distinct assemblages and to estimate total biomass of a sulfide edifice. In addition to major compositional differences, we observed an...
Tipo: Text
Palavras-chave: Vent ecology; Biomass; Faunal succession; Sulfide edifice; Assemblage characteristics; Image analysis; Juan de Fuca Ridge; Ecological model; Marine ecosystem biomass.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00280/39114/37667.pdf

Allee effect in exotic and introduced blowflies
Provedor de dados: 82
Autores: Serra,H; Costa,Mis; Godoy,Wac.
We combined two models to investigate the theoretical dynamics of five exotic and native blowfly species in response to the Allee effect by using demographic parameters estimated from experimental populations. Most of the results suggest stabilization of dynamic behavior in response to the Allee effect. However, the results depended on the magnitude of the demographic parameters of each species, and also indicated chaotic fluctuations and limit cycles. The results are discussed in the context of larval aggregation, an important biological process for blowflies, which naturally incorporates the Allee effect.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calliphoridae; Ecological model; Population dynamics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000500001