caa a22 4500 475827872 CHVBK 20180406123833.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s005310050296 doi (NATIONALLICENCE)springer-10.1007/s005310050296 Spatial distribution of the calcareous dinoflagellate Thoracosphaera heimii in the upper water column of the tropical and equatorial Atlantic [Elektronische Daten] [B. Karwath, D. Janofske, H. Willems]  The horizontal and vertical distribution of the phototrophic, calcareous dinoflagellate Thoracosphaera heimii in the upper part of the water column (10-200 m) of the equatorial and tropical Atlantic Ocean has been studied. This first survey has been made to determine which part of the water column is inhabited by T. heimii and is subsequently represented as a signal in the sediment record by this species. The study concentrates on the fossilisable vegetative coccoid life stage of the species and differentiates between T. heimii shells with cell content and empty ones. The highest quantities of T. heimii shells with cell content have been observed in water depths between 50 and 100 m and coincide with relatively lower temperatures and relatively higher salinities than respective surface conditions. We propose that in the tropical equatorial Atlantic the major part of the environmental signal given by T. heimii can be assumed to represent the deeper levels of the upper water column. Springer-Verlag Berlin Heidelberg, 2000 Key words Calcite nationallicence Dinoflagellates nationallicence Phytoplankton nationallicence Atlantic nationallicence Actuopalaeontology nationallicence Karwath B. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut Janofske D. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut Willems H. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut https://doi.org/10.1007/s005310050296 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310050296 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karwath B. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut NATIONALLICENCE 700 1- Janofske D. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut NATIONALLICENCE 700 1- Willems H. Fachbereich-5 Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany Fax: +0421-2184451 e-mail: karwath@micropal.uni-bremen.de, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer