Increase in Growth and Alteration of C:N Ratios of Avicennia marina and Rhizophora stylosa Subject to Elevated CO2 Concentrations and Longer Tidal Flooding Duration

We investigated the effects of elevated CO2 concentrations and longer tidal flooding duration on two-year-old Avicennia marina and Rhizophora stylosa seedlings for a full year. The seedlings were grown in greenhouses for ambient CO2 (400 ppm) and in enclosed CO2-controlled chambers, which were installed inside the greenhouses for elevated CO2 (800 ppm). The tidal flooding duration was set-up according to the species distribution in the intertidal zone in New Caledonia for the controlled treatment and was increased by 1 h 45 min for the experimental treatment. A total of 400 A. marina and 720 R. stylosa were monitored during this experiment. We measured heights and basal diameters of all seedlings every 90 days, and we determined the above and below ground biomass at the end of the experiment. Our results showed that elevated CO2 increased the growth rates of both A. marina and R. stylosa, for which the final biomass was, respectively, 46 and 32% higher than in the ambient CO2 treatment. We suggest that this increase was driven by a stimulation of photosynthesis under elevated CO2, as demonstrated in a previous study. Considering the tidal flooding duration treatment, we observed a contrasted effect between the species. Longer tidal flooding increased the growth of A. marina, whereas it reduced the growth of R. stylosa in comparison to the controlled treatment. This result may be related to the specific ecosystem zonation in this semi-arid climate, which limits water inputs into the Avicennia zone that increases the salt concentration in the soil, whereas Rhizophora is regularly submerged by tides due to its lower position in the intertidal zone. As a result, the combination of both treatments had a positive cumulative effect on the growth of A. marina. Although it was not the case for R. stylosa, the negative effect of longer tidal flooding on this species did not suppress the enhancement of growth resulting from elevated CO2 concentrations. At the end of the experiment, elevated CO2 increased the C:N ratios of the seedlings, thereby producing a more refractory organic matter, which will potentially result in lower decomposition rates and thus may increase carbon accumulation in mangrove soils. These results suggest that future climate changes may enhance the productivity of mangrove seedlings by increasing their growth, which may in turn increase the carbon storage potential of mangroves in their biomass

De la philologie à la sociologie : honneur et « capital symbolique » dans la Rome républicaine

Si l’étude des grandes notions politiques, sociales et morales de la civilisation romaine doit passer par une analyse sémantique, cette dernière gagne à être complétée par une approche sociologique des pratiques recouvertes par ces notions. Cet article se propose de montrer la fécondité d’une telle méthode en associant à l’étude sémantique d’un mot latin, une approche utilisant un des outils théoriques de la sociologie, le concept de « capital symbolique » forgé par Pierre Bourdieu. Est ainsi mis en avant le fonctionnement économique de l’honneur à Rome, patrimoine progressivement constitué grâce à la reconnaissance de la collectivité, thésaurisé, et susceptible de devenir instrument de pouvoir.If the study of the great political, social and moral notions of Roman civilization needs to go through a semantic analysis, the latter profits by a sociological approach of the practices overlaid by these notions. This article purports to show the fertility of such a method by associating the semantic study of a Latin word with an approach that makes use of one of the theoretical tools of sociology, the concept of “symbolic capital” invented by Pierre Bourdieu. Thus is foregrounded the economic functioning of honour at Rome, a patrimony gradually built up through the recognition of the collective body, hoarded up and susceptible to become an instrument of power

A propos de l'expression « Virus inactive »

Jacquotot H. A propos de l'expression «Virus inactivé». In: Bulletin de l'Académie Vétérinaire de France tome 112 n°8, 1959. pp. 499-506

Au sujet du vaccin formolé aluminé contre le Rouget

Jacotot Henri. Au sujet du vaccin formolé aluminé contre le Rouget. In: Bulletin de l'Académie Vétérinaire de France tome 103 n°2, 1950. pp. 121-124

Les ultra-virus tissulaires tués en tant que générateurs d’immunité ( Deuxième note)

Jacotot Henri. Les ultra-virus tissulaires tués en tant que générateurs d'immunité Deuxième note. In: Bulletin de l'Académie Vétérinaire de France tome 102 n°6, 1949. pp. 248-257

Peste aviaire et maladie de Newcastle. Systématique et terminologie

Jacotot Henri. Peste aviaire et maladie de Newcastle, systématique et terminologie. In: Bulletin de l'Académie Vétérinaire de France tome 103 n°5, 1950. pp. 249-254

Genre et danses nouvelles en France dans l’entre-deux-guerres

Comment les discours et les images produits sur le thème des pratiques sociales de danse deviennent-ils, dans l’entre-deux-guerres (1919-1939), le réceptacle d’un discours plus ample sur les mutations des rapports de genre ? C’est ce que cet article essaie d’éclairer, en analysant le contexte de profond bouleversement qui caractérise le domaine de la danse de société au lendemain de la Grande Guerre, avec l’introduction en France de danses importées des Amériques. L’imaginaire des danses nouvelles, support privilégié de la représentation du couple, suscite alors des représentations transgressives des rôles sexués, à travers les figures de la garçonne et du danseur mondain, tandis que les pratiques corporelles des femmes sont profondément affectées par les mutations du répertoire chorégraphique.How do the images and discourses relating to social dance practices become, in the inter-war years (1919-1939), the site of a more general discourse on the transformations within gender relations ? The article seeks to illuminate this issue by analysing the profound disruption that characterized the field of social dance in the aftermath of the Great War with the introduction in France of dances coming from the Americas. The new dances, a perfect medium for the representation of the couple, gave rise to representations which transgressed sexual roles, through the figure of the “garçonne” and the “danseur mondain”, while female body practices were, as a result, profoundly modified by these changes in the choreographic repertory

Vaccination contre la pasteurellose des boeufs et des buffles

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