8th International Nannoplankton Association Conference
Allan G. S. Fernando, Alyssa M. Peleo-Alampay, Martin Wiesner:
Core-top samples, collected during Sonne cruises SO-132 and SO-140 in 1998 and 1999, respectively, were analysed for calcareous nannoplankton content. Results revealed the presence of at least 31 species, of which three are reworked. Comprising 87% to 98% of the total assemblage are the species Emiliania huxleyi, Gephyrocapsa oceanica and Florisphaera profunda. Almost half of the total assemblage in the eastern portion of the study area (off Vietnam) is composed of E. huxleyi. In the western portion, near Luzon Island, E. huxleyi is subordinate in abundance to G. oceanica, but F. profunda dominates, comprising 50% to 86% of the total assemblage. In both areas, the sensitivity of the species F. profunda to turbidity is apparent in the increase of its relative abundance farther from the coast and with increasing water-depth. On the other hand, G. oceanica abundance decreases offshore with increasing water-depth for both areas. Braarudosphaera bigelowii was found only in the western portion of the South China Sea.
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