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Auteur (up) Brochier, T.; Lett, C.; Freon, P.
Titre Investigating the “northern Humboldt paradox” from model comparisons of small pelagic reproductive strategies in eastern boundary upwelling ecosystems Type Article scientifique
Année 2011 Publication Revue Abrégée Fish and Fisheries
Volume Numéro Pages 94-109
Mots-Clés Benguela; Californie; Canaries; comparative; Courant; De; Espece; estimation; Etude; Humboldt; Impact; L'Environnement; Marin; Pelagique; Poisson; Reproduction; Stock; upwelling
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ISSN 1467-2979 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 124
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Auteur (up) Coll, M.; Steenbeek, J.; Sole, J.; Palomera, I.; Christensen, V.
Titre Modelling the cumulative spatial-temporal effects of environmental drivers and fishing in a NW Mediterranean marine ecosystem Type Article scientifique
Année 2016 Publication Revue Abrégée Ecol. Model.
Volume 331 Numéro Pages 100-114
Mots-Clés acoustic estimation; anchovy engraulis-encrasicolus; climate-change; Cumulative effects; Ecopath with Ecosim; environment; european hake; exploited ecosystems; fishing; food-web model; food webs; hake merluccius-merluccius; protected areas; south catalan sea; trawling disturbance
Résumé To realistically predict spatial-temporal dynamics of species in marine ecosystems it is essential to consider environmental conditions in conjunction with human activities and food web dynamics. In this study, we used Ecospace, the spatial-temporal dynamic module of Ecopath with Ecosim (EwE) food web model, to drive a spatially explicit marine food web model representing the Southern Catalan Sea (NW Mediterranean) with various environmental drivers and with fishing. We then evaluated the individual and joint effects of environmental conditions and fishing in various compartments of the food web. First we used a previously developed EwE model fitted to time series of data from 1978 to 2010 as a baseline configuration. The model included 40 functional groups and four fishing fleets. We first ran the original Ecospace spatial-temporal dynamic model using the original habitat configuration, in addition to fishing, and we predicted species distributions and abundances. Afterwards, we ran the new habitat foraging capacity model using the most important environmental drivers linked with the Ebro River delta dynamics (salinity, temperature, and primary production), in addition to depth, substrate and fishing, and we compared results with those from the original implementation of Ecospace. Three commercial species, European hake (Merluccius merluccius), anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus), were used to analyse results. Species distributions more closely matched the empirical information available from the study area when using the new habitat capacity model. Results suggested that the historical impacts of fishing and environmental conditions on the biomass and distributions of hake, anchovy and sardine were not additive, but mainly cumulative with a synergistic or antagonistic effect. Fishing had the highest impact on spatial modelling results while the spatial distribution of primary producers and depth followed in importance. This study contributes to the development of more reliable predictions of regional change in marine ecosystems of the Mediterranean Sea. (C) 2016 Elsevier B.V. All rights reserved.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0304-3800 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1643
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Auteur (up) Duboz, R.; Versmisse, D.; Travers, M.; Ramat, E.; Shin, Y.-J.
Titre Application of an evolutionary algorithm to the inverse parameter estimation of an individual-based model Type Article scientifique
Année 2010 Publication Revue Abrégée Ecological Modelling
Volume 221 Numéro Pages 840-849
Mots-Clés algorithms; and; calibration; ecosystem; estimation; Evolutionary; genetic; Individual-based; marine; model; Parameter
Résumé Inverse parameter estimation of individual-based models (IBMs) is a research area which is still in its infancy, in a context where conventional statistical methods are not well suited to confront this type of models with data. In this paper, we propose an original evolutionary algorithm which is designed for the calibration of complex IBMs, i.e. characterized by high stochasticity, parameter uncertainty and numerous non-linear interactions between parameters and model output. Our algorithm corresponds to a variant of the population-based incremental learning (PBIL) genetic algorithm, with a specific “optimal individual” operator. The method is presented in detail and applied to the individual-based model OSMOSE. The performance of the algorithm is evaluated and estimated parameters are compared with an independent manual calibration. The results show that automated and convergent methods for inverse parameter estimation are a significant improvement to existing ad hoc methods for the calibration of IBMs.
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ISSN 0304-3800 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 69
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Auteur (up) Krichen, E.; Rapaport, A.; Fouilland, E.
Titre About frame estimation of growth functions and robust prediction in bioprocess modeling Type Article scientifique
Année 2020 Publication Revue Abrégée Journal of Process Control
Volume 85 Numéro Pages 121-135
Mots-Clés Functional estimation; Growth functions; Interval observers; Least square
Résumé We address the problem of determining functional framing from experimental data points in view of robust time-varying predictions, which is of crucial importance in bioprocess monitoring. We propose a method that provides guaranteed functional bounds, instead of sets of parameters values for growth functions such as the classical Monod or Haldane functions commonly used in bioprocess modeling. We illustrate the applicability of the method with bioreactor simulations in batch and continuous mode, as well as on real data. We also present two extensions of the method adding flexibility in its application, and discuss its efficiency in providing guaranteed state estimations.
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ISSN 0959-1524 ISBN Médium
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Notes WOS:000510953100011 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2728
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Auteur (up) MELLON-DUVAL, C.; PONTUAL, H.D.E.; METRAL, L.; QUEMENER, L.
Titre Growth of European hake (Merluccius merluccius) in the Gulf of Lions based on conventional tagging Type Article scientifique
Année 2010 Publication Revue Abrégée Ices Journal Of Marine Science
Volume 67 Numéro 1 Pages 62-70
Mots-Clés age estimation; European hake; growth; Mediterranean; tagging
Résumé Growth of European hake was estimated from the results of a conventional tagging study in the Gulf of Lions, the first tagging experiment to have been undertaken on the species in Mediterranean waters. In all, 4277 hake 15–40 cm long were tagged and released on the inshore fishing grounds during spring 2006. The overall recapture rate was 6.5% and times-at-liberty ranged from 1 to 717 d. Growth rate in hake varied with size and sex. The estimated growth parameter (von Bertalanffy k) was estimated as double previously published values based on size frequency distribution in the area. Compared with recent growth parameters derived from the tagging experiments in the Bay of Biscay, k was estimated to be slightly lower in the Gulf of Lions. With this faster growth, hake would mature earlier than previously thought: at age 2 for both sexes, instead of at age 3 or 4 as currently accepted for the Mediterranean. Growth rate by sex decreased to a similar level once fish had attained sexual maturity.
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ISSN 1054-3139 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 90
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