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

By Jean-Pierre Debenay

ISBN-10: 2709917297

ISBN-13: 9782709917292

ISBN-10: 2856536980

ISBN-13: 9782856536988

Numbering approximately 10000 species, Foraminifera represent the main different crew of shelled microorganisms within the ocean. also they are essentially the most worthwhile instruments for environmental evaluate and tracking courses. This advisor by way of Jean-Pierre Debenay offers an outline of the environmental stipulations round New Caledonia, an obtainable advent to Foraminifera, and a precis of the study that has been conducted from the island state. It additionally describes multiple thousand species of Foraminifera amassed round New Caledonia, accompanying each 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 pragmatic reference.

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

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Larger areas. Such dispersion probably plays a major role during the seasonal periods of growth of algae and seagrass, and the subsequent colonization by epiphytic communities. Carnivorous fish ingest a small number of tests, which are generally altered by the acidic phase of digestion and have no impact on foraminiferal assemblages. The selective predation does not seem to significantly impact upon foraminiferal populations. Even if Tretomphalus spp. are selectively preyed on, the populations of their epiphytic benthic phases (Rosalina, Neoconorbina and Cymbaloporetta) are still highly abundant (DEBENAY & PAYRI, 2010) and do not show any negative impact of predation.

This distribution, as it appears on the maps, results from the combined influence of all environmental parameters. Among them, the oceanic influence appears to have a prominent role. Two other parameters are known to influence foraminiferal assemblages: depth and grain size of the sediment, which are somewhat interrelated due to decreasing energy with depth. Both data were available and the distribution of the most abundant and frequent species with depth and grain size was examined. For graphing the distribution of species with these two parameters, samples were grouped into classes with a class interval of 5 m for depth, and of 5% for grain size.

For graphing the distribution of species with these two parameters, samples were grouped into classes with a class interval of 5 m for depth, and of 5% for grain size. The frequency of each species (% of samples where the species is represented) was calculated for each class of samples. 34 | 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 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 Coral Sea Nouméa Prony Coral Sea Prony Coral Sea | Figure 31 Species widely distributed, but mostly connected to the SE open area and to passes.

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


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