Observatoire de l'environnement Nouvelle Calédonie

Il y a environ 1427 résultats pour les termes de recherche: changement climatique

Affichage des résultats: 511 à 520

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Evolution geochimique et exemple d'amenagement des mangroves au Senegal (Casamance)

The mangroves of Senegal are limited to the inlet of the Casamance - a river with very low discharge - and to the Sine-Saloum. The mineralogical and geochemical analysis of sediments (derived from 30 deep bore-holes) shows the thickness of the mangro...

Passive Margin Development. A Consequence of Specific Convection Patterns in a Variable Viscosity Upper Mantle

Simple thermodynamics calculations are applied to processes of a rising plume within an environment of an upward directed gradient of viscosity in the uppermost mantle. Four stages of the development of passive margins are described. Following an ini...

Foraminifera in the diet of coral reef fish from the lagoon of New Caledonia : predation, digestion, dispersion

Les foraminifères benthiques marins sont abondants et représentent une source de nourriture potentielle pour les poissons. Les études précédentes des foraminifères dans le régime alimentaire des poissons se sont appuyées sur de petits nombres...

Mining in New Caledonia : environmental stakes and restoration opportunities

New Caledonia is a widely recognised marine and terrestrial biodiversity hot spot. However, this unique environment is under increasing anthropogenic pressure. Major threats are related to land cover change and include fire, urban sprawling and minin...

Espaces de vie et conscience politique : le cas des Mélanésiens de Nouvelle-Calédonie;Le voyage inachevé... à Joël Bonnemaison

For a long time, recovering the land of their fathers (under colonial control) has been the main target for the Melanesian community in New Caledonia. After 1985, the objective has been changing to recovering sovereignty. But every day, the unbalance...

Structure et fonctionnement des assemblages d'invertébrés récifaux : applications aux platiers pêchés de Nouvelle-Calédonie

Les assemblages d’invertébrés benthiques sont particulièrement vulnérables aux changements de l’environnement et leur gestion nécessite la prise en compte des divers facteurs naturels et anthropiques, comme la pêche. L’objecti...

Alert thresholds for monitoring environmental variables : a new approach applied to seagrass beds diversity in New Caledonia

Monitoring ecological variables is mandatory to detect abnormal changes in ecosystems. When the studied variables exceed predefined alert thresholds, management actions may be required. In the past, alert thresholds have been typically defined by exp...

Reproductive biology of the holothurians from major communities of the New Caledonian lagoon

The reproductive biology of nine species of aspidochirote holothurians from the majour communities of the New Caledonian lagoon has been analysed. The data were obtained from monthly sampling from 1978 to 1982 of their populations on reef slopes and ...

Comparative ichthyotoxicity of shallow and deep water sponges of New Caledonia;Proceedings of the sixth international coral reef symposium

A survey of comparative ichthyotoxicity in marine sponges from shallow and deep water in the Southern province of New Caledonia was conducted. Test fish #Gambusia affinis$ (#Vertebrata, Pisces$) were exposed to aqueous macerates of 30 shallow water a...

Comparative ichthyotoxicity of shallow and deep water sponges of New Caledonia;International coral reef symposium : poster

We have conducted a survey of toxicity distribution with depth of common marine sponges of the Southern province of New Caledonia. Test fish #Gambusia affinis$ (#Vertebrata, Pisces$) were exposed to aqueous macerates from 30 shallow water and 30 deep...