Observatoire de l'environnement Nouvelle Calédonie

Il y a environ 394 résultats pour les termes de recherche: rat OR Rattus rattus

Affichage des résultats: 101 à 110

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Epibator insularis, a new species of scincid lizard from l'Ile Walpole, New Caledonia

A new species of skink in the genus Epibator is described from Ile Walpole, a small, isolated, raised vegetated limestone platform, similar to 200 km ESE of southern New Caledonia. The new species is distinguished from its congeners Epibator nigrofas...

Response of phytoplankton to organic enrichment and shrimp activity in tropical aquaculture ponds : a mesocosm study

We conducted a mesocosm study to investigate the combined effect of organic enrichment and sediment resuspension by shrimp on phytoplankton communities in shrimp aquaculture ponds. Hence, the factorial design included 2 factors: (1) shrimp density wi...

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...

Small-scale FADs-associated fishing techniques used in the Pacific region

Over the last 16 years, the Secretariat of the Pacific Community (SPC - formerly the South Pacific Commission) has been developing and providing information on mid-water fishing techniques targeting the larger, deeper-swimming tunas that aggregate ar...

Colony-colony interactions between highly invasive ants

Among invasive species, ants are a particularly prominent group with enormous impacts on native biodiversity and ecosystem functioning. Globalization and on-going climate change are likely to increase the rate of ant invasions in the future, leading ...

Activité magmatique, tectonique et hydrothermale actuelle sur la Dorsale Est Pacifique entre17°-et 19°S(campagne NAUDUR)

The submersible-study of four segments of the East Pacific Rise between 17 degrees and 18 degrees 40'S, where the spreading rate is greater than 150 mm/a, allows us to confirm the variability of the accretion processes. The segment between 17 degrees...

Experimental study of the turbulence intensity effects on marine current turbines behaviour. Part II: Two interacting turbines

The future implantation of second generation marine current turbine arrays depends on the understanding of the negative interaction effects that exist between turbines in close proximity. This is especially the case when the turbines are axially alig...

Physiological responses of female and male black-lip pearl oysters (Pinctada margaritifera) to different temperatures and concentrations of food

This study was designed to measure responses of four-year-old black-lip pearl oysters (Pinctada margaritifera) to different temperatures and food concentrations and to identify the energy requirements of each sex. Oysters were fed a monospecific micr...

Influence of plankton concentration on gametogenesis and spawning of the black lip pearl oyster Pinctada margaritifera in Ahe atoll lagoon (Tuamotu ar...

Pearl culture industry represents one of the dominant business sector of French Polynesia. However, it still entirely relies on unpredictable spat collection success. Our aim was to assess the influence of natural plankton concentration fluctuations ...

Bleaching forces coral's heterotrophy on diazotrophs and Synechococcus

Coral reefs are threatened by global warming, which disrupts the symbiosis between corals and their photosynthetic symbionts (Symbiodiniaceae), leading to mass coral bleaching. Planktonic diazotrophs or dinitrogen (N-2)-fixing prokaryotes are abundan...