By Jean-Pierre Debenay
Numbering approximately 10000 species, Foraminifera represent the main different staff of shelled microorganisms within the ocean. also they are essentially the most useful instruments for environmental evaluate and tracking courses. This consultant via Jean-Pierre Debenay presents an outline of the environmental stipulations round New Caledonia, an obtainable advent to Foraminifera, and a precis of the study that has been performed from the island kingdom. It additionally describes multiple thousand species of Foraminifera accumulated round New Caledonia, accompanying every one access with SEM micrographs and notes on its distribution. prepared into teams to make it effortless to spot every one species, it is going to be a realistic reference.
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Additional info for A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia
38). Seven are primarily associated with sand: Pseudomassilina macilenta, Textularia agglutinans, Amphistegina lessonii, Spirosigmoilina bradyi, Pseudomassilina australis, Textularia oceanica, and Schlumbergerina alveoliniformis. Eight are found in silty sand: Quinqueloculina neostriatula, Pseudohauerina orientalis, Alveolinella quoii, Amphisorus hemprichii, Operculina gaimardi, Nummulites venosus, Amphistegina bicirculata and Ammobaculites reophaciformis. Three species are more abundant in silty clay: Lenticulina gibba, Placopsilina bradyi, and Flintina bradyana.
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.
0 0 10 20 30 40 50 60 70 80 Depth (m) 10 20 30 40 50 60 70 80 90 100 Silt and clay (%) Textularia pseudogramen Pseudomassilina macilenta Spiroloculina antillarum Pseudomassilina macilenta Peneroplis planatus Spirosigmoilina bradyi Marginopora vertebralis Quinqueloculina neostriatula Pseudomassilina australis Pseudohauerina orientalis Amphisorus hemprichii Schlumbergerina alveoliniformis Peneroplis pertusus Textrularia agglutinans Amphistegina lessonii Spirosigmoilina bradyi Pseudomassilina australis Textularia oceanica Schlumbergerina alveoliniformis Quinqueloculina neostriatula Flintina bradyana Alveolinella quoii Pseudohauerina orientalis Nummulites venosus Amphistegina lessonii Alveolinella quoii Heterostegina depressa Anomalinella rostrata Amphisorus hemprichii Operculina ammonoides Operculina gaimardi Amphistegina quoii Heterolepa praecincta Nummulites venosus Amphistegina papillosa Amphistegina radiata Amphistegina bicirculata Amphistegina bicirculata Ammobaculites reophaciformis Lenticulina gibba Ammobaculites reophaciformis Nubeculina advena Heterostegina operculinoides Neoeponides procerus Cycloclypeus carpenteri | Figure 37 Distribution of species with depth (from DEBENAY, 1988a).