Section II Ecology Palaeoecology
Published:January 01, 2013
Worldwide distribution of dinoﬂagellate cysts from the Aptian and Late Albian periods has been reported on palaeogeographical maps. A total of 32 and 38 species, derived from 36 and 70 studies located in the Northern Hemisphere and 14 and 17 studies in the Southern Hemisphere respectively, have been encountered in the literature. Based on their geographical range, we have deﬁned Aptian cosmopolitan, restricted cosmopolitan, Boreal, Austral, Tethyan and restricted to the Northern Hemisphere taxa, with Late Albian Tethyan, Boreal and Austral taxa. The assemblage distribution has enabled the deﬁnition of sea-surface temperature (SST) gradients from 70°N to 70°S and latitudinal climatic belts and the establishment of preliminary biomes. Warmer conditions were found in southern latitudes compared to northern latitudes, as indicated by the worldwide distribution of Tethyan subtropical species. The asymmetric conﬁguration of SST gradients is the same for both the Aptian and Late Albian periods. An estimation of the temperature requirements of extinct planktonic dinoﬂagellates is obtained by combining estimated temperatures from δ18O from ﬁsh teeth, belemnites, oysters and TEX86 ratios related to latitude with the latitudinal distribution of their cysts. Aptian and Albian Tethyan currents with tropical-like temperatures close to 22 °C and 24 °C, respectively, reached 60–70°S.
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Biological and Geological Perspectives of Dinoflagellates
This volume provides an overview of current research on fossil and modern dinoflagellates, as well as highlighting research areas for future collaboration, following the DINO9 International Conference in Liverpool. The volume is organized into four themes, with a review paper for each theme written by the key-note speaker. Each theme also includes a future research foci note following discussion during the conference. The contributions are organized into the following sections: environmental change, ecology/palaeoecology, life cycles and diversity, and stratigraphy and evolution. Also included are notes from two workshops: culture experiments and dinocysts as palaeoceanographic tracers. This volume will be of interest to both the biological and Micropalaeontological communities.