By Jean-Pierre Debenay
Numbering approximately 10000 species, Foraminifera represent the main diversified team of shelled microorganisms within the ocean. also they are essentially the most helpful instruments for environmental evaluate and tracking courses. This advisor through Jean-Pierre Debenay offers an outline of the environmental stipulations round New Caledonia, an obtainable advent to Foraminifera, and a precis of the examine that has been conducted from the island state. It additionally describes a couple of thousand species of Foraminifera amassed 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, will probably be a realistic reference.
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Extra resources for A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia
Bold = dominant species; small letters = accessory species. Coastal areas Coscinospira hemprichii Peneroplis pertusus Peneroplis planatus Textularia agglutinans Triloculina tricarinata A Guide to 1,000 Foraminifera from Southwestern Pacific: New Caledonia Bay of Saint Vincent Bay of Saint Vincent Bay of Saint Vincent Présent Présent Nouméa Présent Nouméa Prony Nouméa Prony Coral Sea Coral Sea Bay of Saint Vincent Bay of Saint Vincent Prony Coral Sea 0 - 10% 10 - 20% > 20% Présent Nouméa Bay of Saint Vincent Présent Nouméa Prony Nouméa Prony Prony Coral Sea Coral Sea Coral Sea Bay of Saint Vincent Bay of Saint Vincent Bay of Saint Vincent Présent Présent Nouméa Présent Nouméa Prony Nouméa Prony Prony Coral Sea Coral Sea Coral Sea Bay of Saint Vincent Bay of Saint Vincent Bay of Saint Vincent 0 - 10% > 10% Présent Nouméa Présent Nouméa Prony Coral Sea | 33 Nouméa Prony Coral Sea Prony Coral Sea | Figure 30 Species from the southern shelf directly influenced by the open sea, and from areas of the lagoon mostly under marine influence coming through SE reefs and passes.
49). Agglutinated foraminifera with brownish organic cement are quite easy to recognize, but agglutinated tests with calcareous cement may be difficult to distinguish from porcelaneous tests that are covered with a surface layer of arenaceous material. Generally, however, 1 | Figure 49 2 1 Typical white and opaque porcelaneous test; 2 Translucent porcelaneous test; 3 Typical transparents and shiny hyaline test; 4 Whitish and translucent hyaline test. Scale bar = 100 µm. 3 1 2 | Figure 50 1 Reophax, an agglutinated foraminifera; 2 Nubeculina, a porcelaneous foraminifera with a coating of agglutinated grains.
Two linear regressions of excess 210Pb versus accumulated sediment yield different sedimentation rates and allow this major environmental change to be dated at 1956 ± 5 years taking into account the overlaying potentially bioturbated layer. In the core samples, the strengthening impact of terrigenous loadings from La Coulée River upward is revealed by an increasing proportion of silt and clay, and of Ni (fig. 47). The concomitant increase of organic-bound Zn results from the growth of Nouméa city with an extensive use of galvanized corrugated iron roofs.
A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia by Jean-Pierre Debenay