By Jean-Pierre Debenay
Numbering approximately 10000 species, Foraminifera represent the main assorted workforce of shelled microorganisms within the ocean. also they are essentially the most useful instruments for environmental overview and tracking courses. This advisor by way of Jean-Pierre Debenay offers an outline of the environmental stipulations round New Caledonia, an obtainable creation to Foraminifera, and a precis of the learn that has been conducted from the island country. It additionally describes a couple of thousand species of Foraminifera gathered round New Caledonia, accompanying every one access with SEM micrographs and notes on its distribution. prepared into teams to make it effortless to spot each one species, it will likely be a pragmatic reference.
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Additional resources for A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia
Indicate a noticeable marine influence in an open bay. The lack of foraminifera around 85-80 cm suggests a drying out of the water body. The presence of gypsum in the sediment is consistent with this hypothesis. In the section 80-35 cm, an organic-rich sediment containing rare fragments of foraminiferal tests dominated by Ammonia tepida with a few Quinqueloculina spp. indicates a separation from the sea. It could represent a eutrophic brackish pond, but reworking of tests from underlying sediments is also possible.
The presence of tests on the deeper southern shelf, to the south, suggests a gravity-driven sediment transport on the southern shelf, down to deeper low energy areas. The last area of test deposition, along the south-east coast of Ouen Island, indicates a southward longshore transport. The distribution of silt and clay is consistent with the sediment transport direction deduced from the distribution of O. bartshi, and the combination of both sets of information allows a better comprehension of sedimentary dynamic in front of the bay (fig.
This study also reveals that some foraminiferal species might have quite different life modes between environments and regions. For example, Sorites orbiculus was considered to use only a limited number of macroids with bare, flat surfaces in Florida Bay and on the Great Barrier Reef (FUJITA & HALLOCK, 1999; LOBEGEIER, 2001), and to be permanently fixed to the blades of macroalgae and seagrasses in Japan (SARASWATI, 2002). In New Caledonia, it was found on a variety of substrata and appeared to have the same free-living behavior as Marginopora and Amphisorus.