Spatial distribution of calcareous dinoflagellate cysts in surface sediments of the Atlantic Ocean between 13°N and 36°S.
作者： Karin A.F. Zonneveld , Aanja Brune , Helmut Willems
DOI: 10.1016/S0034-6667(00)00024-5
关键词: Calcareous 、 Spatial distribution 、 Salinity 、 Botany 、 Calcareous dinoflagellate cysts 、 Stratification (water) 、 Surface water 、 Water column 、 Biology 、 Oceanography 、 Sediment
摘要: To enhance the limited information available about palaeo-ecological significance of calcareous dinoflagellates, we have studied their lateral distribution in surface sediments equatorial and south Atlantic between 13°N 36°S. Calcareous dinoflagellate cysts appear to be widely distributed throughout area. In sediments, concentrations (cyst per gram dry sediment) vegetative stage Thoracosphaera heimii are generally higher than that (presumably) resting cysts. Distribution patterns Orthopithonella granifera (Futterer) Keupp Versteegh, Rhabdothorax spp. Kamptner., Sphaerodinella albatrosiana (Kamptner) Versteegh S. praratabulated, tuberosa var. 1 2 ratios these species been compared with temperature, salinity, density stratification gradients upper water column. is characteristically present more temperate regions characterized by high seasonality. Dinoflagellates producing able tolerate nutrient concentrations, mixing abundant sea temperatures oligotrophic conditions. contrast, negatively related temperature. The other cyst did not show a characteristic pattern relation environmental gradients. The ratio can used for reconstructing presence 50 m column, whereas O. might palaeotemperature reconstructions. areas may useful reconstruction palaeoenvironmental
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