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| Registros recuperados: 50 | |
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| De Pontual, Helene. |
| L'importance économique de la civelle en Loire n'est plus à démontrer. Cette région est en effet à la base de 50 % de la production française qui s'élève à 2 000 t environ (ELIE, communication personnelle). La prédation croissante exercéepar l'homme (pêche, construction d'ouvrages industriels, modifications de l'hydrodynamisme des bassins versants, pollutions diverses) conduit à la nécessité d'une gestion de cette ressource. Il semble, dans ce cadre, important de définir le niveau de perturbations des phénomènes migratoires engendrées par le développement actuel et futur des centrales thermiques classiques ou nucléaires. La centrale de Cordemais, actuellement en extension, exerce un impact encore peu étudié sur la montée des civelles (sur ce seul site, des... |
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| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00139/25018/23122.pdf |
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| Pecquerie, Laure; Fablet, Ronan; De Pontual, Helene; Bonhommeau, Sylvain; Alunno-bruscia, Marianne; Petitgas, Pierre; Kooijman, Sebastiaan A. L. M.. |
| Environmental conditions experienced by aquatic organisms are archived in biogenic carbonates such as fish otoliths, bivalve shells and coral skeletons. These calcified structures present an accretionary growth and variations in optical properties - color or opacity - that are used to reconstruct time. Full and reliable exploitation of the information extracted from these structures is, however, often limited as the metabolic processes that control their growth and their optical properties are poorly understood. Here, we propose a new modeling framework that couples both the growth of a biogenic carbonate and its optical properties with the metabolism of the organism. The model relies on well-tested properties of Dynamic Energy Budget (DEB) theory. It is... |
| Tipo: Text |
Palavras-chave: Otolith; Calcification; Metabolism; Bioenergetic model; Food reconstruction; Dynamic Energy Budget theory. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00060/17082/14593.pdf |
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| Mahe, Kelig; Parisi, Vincenc; Carbini, Sebastien; Soria, J.a.; Harbitz, A; De Pontual, Helene; Cotano, U; Songer, S; Millner, R; Lewy, P; Gudmundsson, E.f; Fablet, Ronan; Benzinou, Abdesslam. |
| Most of the fish stocks are assessed using age-based models, however age estimations using otoliths costs several million euros annually. In this context, Automatic Fish Ageing (EU Project) would provide means to standardize ageing among laboratories and build interpreted image databases ensuring the information conservation. Automation improves growth studies while reducing the cost of the acquisition of age data. The whole processing chain from the acquisition of otolith data to the actual ageing issue using pattern recognition or statistical inference has been realised for three case studies : a) Cod (Gadus morhua ; Faeroes, North Sea, North East Arctic) b) Anchovy (Engraulis encrasicolus ; Bay of Biscay) c) Plaice (Pleuronectes platessa, Eastern... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00011/12270/10548.pdf |
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| Drogou, Mickael; Laurec, Alain; Bissery, Claire; Mahevas, Stephanie; Demaneche, Sebastien; Begot, Eric; Weiss, Jerome; De Pontual, Helene; Le Goff, Ronan. |
| La décroissance des rendements de capture professionnelle de bar européen Dicentrarchus labrax à partir des années 2010-2011 a amené la DPMA à demander à l’Ifremer de proposer un programme de recherche visant à mieux connaitre la biologie de l’espèce et à acquérir des données et connaissances permettant d’envisager sa gestion. Parmi les actions de recherche identifiées comme prioritaires, l’action « Données professionnelles » a compris deux grands volets : - utilisation des données de captures professionnelles françaises afin de produire des indices annuels d’abondance en bars adultes, - acquisition de données biologiques (maturité sexuelle principalement et courbe de croissance) sur le bar dans le golfe de Gascogne |
| Tipo: Text |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00429/54044/55428.pdf |
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| Borelli, G; Guibbohni, M; Mayer Gostan, N; Priouzeau, France; De Pontual, Helene; Allemand, D; Puverel, S; Tambutte, E; Payan, P. |
| Ionic and organic parameters of the otolith calcification process in the trout Oncorhynchus mykiss were analysed in plasma and endolymph over the day:night cycle. Plasma pH remained constant and total CO2 concentration was significantly lower (by 21%) during the day than at night. Calcifying parameters (total CO2, total calcium concentration) were measured in the proximal and distal endolymphs and were unchanged in the latter during the day:night cycle, but fluctuated in the former. Non-collagenous protein and collagen concentrations in endolymph were higher (1.5- and 10-fold, respectively) during the day than at night. As there was no change in total calcium concentration, we propose that Ca2+ increases during the dark period and was maximal by the end of... |
| Tipo: Text |
Palavras-chave: Endolymph; Day night cycle; Calcification; Otolith. |
| Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/2003/publication-418.pdf |
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| Durieux, Eric D. H.; Labonne, Maylis; Begout, Marie-laure; De Pontual, Helene. |
| The common sole Solea solea (L.) is a commercially important and widely distributed flatfish of the North-East Atlantic. For the Bay of Biscay stock, sole nurseries display differences in terms of quantity and quality. In fine the measure of the quality of a habitat for juveniles of a particular species is expressed by the contribution to the recruitment into the adult population. Understanding this connectivity between juvenile and adult habitats, i.e. evaluating the contribution of each nursery to a single adult stock appears essential in terms of stock management. However, this critical link is still missing for the Bay of Biscay sole stock. Determining if nurseries could be discriminated using otolith elemental composition analysis constitutes the... |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00073/18377/15949.pdf |
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| Registros recuperados: 50 | |
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