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A guide to 1,000 foraminifera from southwestern Pacific : by Jean-Pierre Debenay

By Jean-Pierre Debenay

Numbering approximately 10000 species, Foraminifera represent the main varied team of shelled microorganisms within the ocean. also they are essentially the most helpful instruments for environmental evaluation and tracking courses. This advisor through Jean-Pierre Debenay presents an outline of the environmental stipulations round New Caledonia, an available creation to Foraminifera, and a precis of the study that has been performed from the island kingdom. It additionally describes a couple of thousand species of Foraminifera accrued round New Caledonia, accompanying every one access with SEM micrographs and notes on its distribution. equipped into teams to make it effortless to spot each one species, it will likely be a realistic reference.

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Extra info for A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia

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Finally, the general trend (that can be divided into four main stages) may be explained by both changes in anthropogenic influences and natural conditions (DEBENAY & FERNANDEZ, 2009). e. geochemistry and bioindicators) On the basis of the observations on recent sediment, and of previous knowledge about foraminiferal behavior, the trends expected for foraminiferal assemblages were: a progressive decrease of species diversity, a concomitant decrease of porcellaneous tests, and an increase of A. tepida, correlative with increasing contamination.

3 1 2 | Figure 50 1 Reophax, an agglutinated foraminifera; 2 Nubeculina, a porcelaneous foraminifera with a coating of agglutinated grains. Scale bar = 100 µm. 4 A Guide to 1,000 Foraminifera from Southwestern Pacific: New Caledonia 1 appearing so at first sight. The tests of some species have complex or obscured architectures and cannot be placed in either of the above groups. A specific section has been devoted to these species. Comparing the studied species with the illustrations displayed in the summary will allow a preliminary identification.

The influence of the river on foraminiferal assemblages can be seen in a lower diversity in front of the estuary, and a lower proportion of porcelaneous tests in the Boulari Bay. The proportion of Ammonia tepida, known to be tolerant to adverse conditions, including organic and chemical pollution, and to fresh water input, increases towards the mouth of the Coulée River. In Sainte Marie Bay, high relative abundances of A. tepida are associated with organic matter content close to or over 20%, which may be (at least partly) related to the sewage origin of labile organic matter.

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