Download e-book for iPad: A guide to 1,000 foraminifera from southwestern Pacific : by Jean-Pierre Debenay

By Jean-Pierre Debenay

ISBN-10: 2709917297

ISBN-13: 9782709917292

ISBN-10: 2856536980

ISBN-13: 9782856536988

Numbering approximately 10000 species, Foraminifera represent the main assorted crew of shelled microorganisms within the ocean. also they are some of the most worthwhile instruments for environmental evaluate and tracking courses. This advisor by means of Jean-Pierre Debenay presents an outline of the environmental stipulations round New Caledonia, an available creation to Foraminifera, and a precis of the learn that has been performed from the island country. It additionally describes multiple 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, will probably be a pragmatic reference.

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Dead algae, shrimp faeces and feed residues), which comprises most of Easily Oxidized Material and induces a high oxygen demand, appears as the most likely responsible for the high proportion of deformed tests. This finding should help in better management of aquaculture ponds, foraminifera being used as early warning bioindicators for noxious effects of the accumulation of Easily Oxidized Material, before it leads to shrimp mortality. Foraminifera and environmental changes 100 µm | Figure 45 8 9 10 Foraminifera from shrimp ponds 1-2: Ammonia tepida, spiral side, 1) normal test, 2) abnormal test; 3 Ammonia tepida, complex abnormal test; 4-5: Elphidium excavatum, 4) normal test, 5) abnormal test; 6-7: Caronia exilis, 6) normal test, 7) abnormal test; 8-10: Quinqueloculina seminula, 8) normal test, 9) abnormal test, last chambers making less than half a whorl, 10) abnormal test, last chamber making more than half a whorl.

Their distribution gives a clear picture of the impact of these waters on the benthos, with a flow curved towards the NW by the general drift that affects the external part of the lagoon, following the external edge of lagoonal depressions. Since foraminiferal tests will be preserved in the sediment, the image of the double water circulation given by foraminiferal thanatocoenoses will be fossilized. It shows how, in turn, fossil foraminifera may provide a valuable tool for understanding hydrodynamics of fossil lagoonal environments.

Della Patrona; mangrove samples were collected during several field trips, and provided by C. Marchand. 30 | A Guide to 1,000 Foraminifera from Southwestern Pacific: New Caledonia Foraminifera in the southwestern lagoon General distribution The global contribution of foraminifera to the sediment has been presented above (fig. 7). 5 mm, the species richness appears to be related to oceanic influence with more than 25 species on the southern shelf, near the passes, and in the axis of the lagoon. The lower richness is found in the bays, with fewer than 5 species in the bays of Saint Vincent and Prony.

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

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