Process length variation of the cyst of the dinoflagellate Protoceratium reticulatum in the North Pacific and Baltic‐Skagerrak region: calibration as an annual density proxy and first evidence of pseudo‐cryptic speciation |
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| Authors: | Kenneth Neil Mertens Manuel Bringué Nicolas Van Nieuwenhove Yoshihito Takano Vera Pospelova Andre Rochon Anne De Vernal Taoufik Radi Barrie Dale R Timothy Patterson Kaarina Weckström Elinor Andrén Stephen Louwye Kazumi Matsuoka |
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| Institution: | 1. Research Unit Palaeontology, Ghent University, Krijgslaan 281 S8, 9000 Gent, Belgium;2. School of Earth and Ocean Sciences, University of Victoria, BC, Canada;3. GEOTOP, Université du Québec à Montréal, Québec, Canada and GEOMAR, Helmholtz Centre for Ocean Research Kiel, Germany;4. Institute for East China Sea Research (ECSER), Nagasaki, Japan;5. Institut des sciences de la mer de Rimouski (ISMER), Université du Québec à Rimouski 310, QC, Canada;6. GEOTOP, Université du Québec à Montréal, Québec, Canada;7. Department of Geosciences, University of Oslo, Norway;8. Ottawa‐Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa, ON, Canada;9. Geological Survey of Denmark and Greenland (GEUS), Department of Marine Geology and Glaciology, Denmark;10. School of Life Sciences, S?dert?rn University, Huddinge, Sweden |
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| Abstract: | Process length variation of cysts of the dinoflagellate Protoceratium reticulatum (Claparède et Lachmann) Bütschli in surface sediments from the North Pacific was investigated. The average process length showed a significant inverse relation to annual seawater density: σt annual = ?0.8674 × average process length + 1029.3 (R2 = 0.84), with a standard error of 0.78 kg m?3. A sediment trap study from Effingham Inlet in British Columbia revealed the same relationship between average process length and local seawater density variations. In the Baltic–Skagerrak region, the average process length variation was related significantly to annual seawater density: σt annual = 3.5457 × average process length ? 993.28 (R2 = 0.86), with a standard error of 3.09 kg m?3. These calibrations cannot be reconciled, which accentuates the regional character of the calibrations. This can be related to variations in molecular data (small subunit, long subunit and internal transcribed spacer sequences), which show the presence of several genotypes and the occurrence of pseudo‐cryptic speciation within this species. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | Baltic‐Skagerrak Effingham Inlet sediment trap SSS SST |
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