We investigated surface carbonate sediments at 33 sites on the outer shelf and slope around N ew C aledonia (163°–167° E , 20°–23° S ), at water depths of 75–720 m. Four carbonate sedimentary facies are recognized on the basis of sediment size fractions and predominant constituents: F acies 1, encrusted grains (rhodoliths and macroids), bryozoa, and benthic foraminifera; Facies 2, bryozoa, benthic foraminifera, and mud; Facies...

Pathogens, which have recently colonized a new host species or new populations of the same host, are interesting models for understanding how populations may evolve in response to novel environments. During its colonization of South America from Africa, P lasmodium falciparum , the main agent of malaria, has been exposed to new conditions in distinctive new human populations (Amerindian and populations of mixed origins) that l...

Since its immigration in the Pacific island of New Caledonia in 1942 (i.e. about 240 tick‐generations ago), the cattle tick Boophilus microplus has experienced a remarkable adaptive diversification there. In order to better understand the population factors involved, we have investigated the B. microplus population structure on that main host‐species, Bos taurus . This study was based microsatellite loci and confirmed that the...