WorldCat Identities

Guary, Jean-Claude

Works: 6 works in 6 publications in 2 languages and 15 library holdings
Roles: Author, Opponent, Thesis advisor
Publication Timeline
Most widely held works by Jean-Claude Guary
Recherches sur les transferts et la fixation du plutonium, de l'américium et du neptunium dans le milieu marin by Jean-Claude Guary( Book )

1 edition published in 1980 in French and held by 6 WorldCat member libraries worldwide

In situ observations of the mechanisms of plutonium transfer in the marine environment by Jean Claude Guary( Book )

1 edition published in 1975 in English and held by 3 WorldCat member libraries worldwide

Diffusion du plutonium en milieu marin : étude quantitative effectuée sur des espèces marines du littoral de la Manche de Brest (Pointe St Mathieu) à Honfleur by Albert Fraizier( Book )

1 edition published in 1977 in French and held by 3 WorldCat member libraries worldwide

Contribution à l'étude écophysiologique d'une algue calcaire,Jania rubens, en vue de sa culture en photobioréacteurs by Eric Gasparotto( Book )

1 edition published in 2008 in French and held by 1 WorldCat member library worldwide

Natural resources of the benthic alga, Jania rubens, are not enough for industrial applications. Axenic microthalli are used to determine the optimal conditions for biomass production in closed photobioreactors. In unstirred cultures, the growth rate of axenic cultures are about 4 mm per month, against 2 mm per month in the nature. The decrease of the ratio Ca++/Mg++ in the ASP12 medium improve the regeneration of algal fragments and the protoplasts yield obtained by enzymatic digestion. When Ca++/Mg++ ratio is adjusted to 0.05, the thalli are viable but partially decalcified. We show that Jania rubens can be cultivated as free microplantlets in mini-photobioreactors with mechanical stirring and/or air bubbling. The experimentations with biomass recycling reactors determine the relations between the light intensity, the alkalinity changes of the culture medium and the final biomass concentrations (> 6 g.L-1 DW). The analysis of the kinetics of alkalinity variations and the photosynthetic activities shows that there is a dynamic equilibrium between the processes of carbonatation and de-carbonatation in stirred cultures. As a result, critical thresholds are identified and used to improve the fed-batch production of J. rubens microthalli in 60 L and 300 L photobioreactors. Maximal biomass and productivities are respectively 1.75 g DW.L-1 and 0.1 g DW.L-1.j-1. The data are analysed according the principle of a constant volume fed-batch culture
Caractérisation de l'adaptation comportementale des téléostéens en élevage : plasticité et effets de la domestication by David Benhaïm( )

1 edition published in 2011 in French and held by 1 WorldCat member library worldwide

The present work aims at a better understanding of the adaptation to farming conditions through a behavioural approach based on the comparison between wild vs. domesticated populations of three species: a marine species, sea bass (Dicentrarchus labrax), two freshwater species, arctic charr (Salvelinus alpinus) and brown trout (Salmo trutta). The thesis is divided into two parts which objectives were : 1) to test the impact of biotic and abiotic factors selected based on their importance in aquaculture on sea bass and artic charr behavioural plasticity (behavioural modifications in response to environmental changes). 2) to characterize the domestication effect on behaviour through the comparison between wild vs. domesticated sea bass and brown trout at different ages and under different experimental conditions (challenges, maze).In the first part, experiments performed on arctic charr showed that an artificial shelter induced a lower mobility, better growth performances and a higher level of survival during the endogenous feeding period, that egg size and social environment play an important role on feeding behaviour and mobility during the weeks following the first exogenous feeding period. These results illustrated behavioural flexibility in response to abiotic and biotic factors. The findings could be used to improve culture performances and welfare of arctic charr. The experiments performed on sea bass showed that a plant-based diet do neither modify the learning abilities under self-feeding conditions nor the cognition under a test situation in a maze, but has an impact on swimming activity (the mean velocity decreased and the total distance travelled decreased) and on the short-term release of cortisol (plasmatic concentration lower than the control group). Another experiment showed that, under self-feeding conditions, size grading and the resulting social environment have no major influence on feed-demand, feeding rhythm, food wastage, social structure, growth performances and physiological status. At last, a three-week fasting period does not modify the social structure and high-triggering fish are exactly the same individuals before and after the fasting period. Individual's triggering activity levels could therefore be considered as personality traits but further research is needed to verify this hypothesis.In the second part of the thesis, the experiment performed on brown trout showed an impact of domestication on swimming activity before and after a light-elicited stress, using a biological material controlled by genotyping. Angular velocity was higher in wild fish while mean velocity and total distance travelled were higher in domesticated fish. All the experiments carried out on sea bass compared wild-caught fish (from the larval stage) to domesticated fish (industrial standard). The first one showed the interplay of age and ontogeny on swimming activity and escape response rate. These variables decreased in fish from both origins. The impact of domestication was shown through differences between wild-caught and domesticated larvae (angular velocity and vigilance level higher in wild fish). They showed that domestication has no influence on gregarism, and cognition in sea bass but there was a high individual variability. The ability to discriminate familiarity was shown only in domesticated fish. The behavioural approach developed in this thesis was demonstrated to be relevant to reveal plasticity in response to a few abiotic and biotic factors among the numerous ones that remain to be investigated. Plasticity plays an important role in the adaptation of fish to culture conditions. Domestication impact on behaviour was also demonstrated as well as the interplay of age and ontogeny. This thesis followed the path and brings new insights for research programs targeting fish selection based upon personality traits in order to improve adaptation for aquaculture or restocking purposes
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Audience level: 0.85 (from 0.58 for Suivi annu ... to 0.95 for Caractéri ...)