Dinoflagellate cyst assemblage distributions as tracers of Pacific v. Atlantic water masses in the Northern Hemisphere
Published:January 01, 2013
S. Bonnet, A. De Vernal, M. Henry, 2013. "Dinoflagellate cyst assemblage distributions as tracers of Pacific v. Atlantic water masses in the Northern Hemisphere", Biological and Geological Perspectives of Dinoflagellates, J. M. Lewis, F. Marret, L. R. Bradley
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The distribution of dinoﬂagellate cyst assemblages is currently used to reconstruct sea-surface conditions. Assemblages provide information about sea-surface temperature and salinity, sea-ice cover and productivity. However, the endemic or regional character of several species, in addition to morphological variability, questions the ecological afﬁnities of taxa and assemblages from one region to another. So far, the North Paciﬁc Ocean represents one of the least-documented areas relative to the North Atlantic and Arctic oceans. In this paper, we incorporate results from recent studies realized in this region and we discuss some species (Impagidinium japonicum, Impagidinium velorum, a new Pyxidinopsis reticulata morphotype, Dalella chathamensis and some Echinidinium species) that seem to be endemic to the Paciﬁc Ocean. Likewise, the taxon that we identify as Selenopemphix nephroides in the North Atlantic Ocean presents a few morphological dissimilarities in the North Paciﬁc. Do we have to consider it as another morphotype or species? Do we need to take into account its variability? In order to answer these questions and avoid inconsistencies in reference databases and consequently in palaeoceanographical interpretations, it is of primary importance to standardize the identiﬁcation of ambiguous species and to carry out more taxonomic/phylogenetic studies on dinoﬂagellate–dinocyst relationships.
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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.