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

By Jean-Pierre Debenay

Numbering approximately 10000 species, Foraminifera represent the main assorted crew of shelled microorganisms within the ocean. also they are essentially the most invaluable instruments for environmental evaluate and tracking courses. This advisor via 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 state. It additionally describes a couple of thousand species of Foraminifera accumulated 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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A Guide to 1,000 Foraminifera from Southwestern Pacific: New Caledonia distribution of silt and clay, and Ni content (fig. 46). 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.

The distribution of their tests on the southern shelf, in Bay of Saint Vincent Nouméa Prony Coral Sea | Figure 39 Marine influence, as shown by foraminifera, mainly Pyrgo denticulata and Gypsina globula (from DEBENAY, 1988b). connection with the passes, and even behind the barrier reef for Gypsina globula, shows their dependence on oceanic inputs. Comparison between their distribution areas, elongated and curved to the NW, and the water circulation described by ROUGERIE (1986) suggests that they are distributed along the trajectory of subsuperficial oceanic water penetrating the lagoon through passes (fig.

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.

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