Observatoire de l'environnement Nouvelle Calédonie

Il y a environ 1426 résultats pour les termes de recherche: changement climatique

Affichage des résultats: 531 à 540

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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...

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...

Exploration de la performance de la gouvernance des petites pêcheries du Pacifique Sud par une démarche de recherche-action

Notre travail est une contribution à l'élaboration d'un cadre de recherche pour étudier le développement institutionnel pour la cogestion des ressources halieutiques communes, qui reste un mode de gouvernance minoritaire à l'échelle mondiale ma...

Nickel and ocean warming affect scleractinian coral growth

The sensitivity of corals and their Symbiodinium to warming has been extensively documented; however very few studies considered that anthropogenic inputs such as metal pollution have already an impact on many fringing reefs. Thus, today, nickel rele...

Acclimatization of massive reef-building corals to consecutive heatwaves

Reef-building corals typically live close to the upper limits of their thermal tolerance and even small increases in summer water temperatures can lead to bleaching and mortality. Projections of coral reef futures based on forecasts of ocean temperat...

Chemical and physical transfers in an ultramafic rock weathering profile: 2. Dissolution vs. accumulation of platinum group minerals

The chemical weathering of ultramafic rocks has resulted in eluvial concentration of Pt-group minerals (PGM) in lateritic weathering profiles of southern New Caledonia. The Pt mineralization interpreted as being primary consists of Pt-group minerals ...

Etude sedimentologique des milieux de mangrove du Benin occidental (Afrique de l'Ouest)

The littoral area of Benin is a lagoonal-estuarial, indeed even deltaic, environment. Poor in species, the mangrove of Benin belongs to the tropical Atlantic type tending to be humid, considering the "drought belt" which affects this region. It under...

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...

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...

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...