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
Article first published online: 21 AUG 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 27, Issue 7, pages 734–744, October 2012
How to Cite
Mertens, K. N., Bringué, M., Van Nieuwenhove, N., Takano, Y., Pospelova, V., Rochon, A., De Vernal, A., Radi, T., Dale, B., Patterson, R. T., Weckström, K., Andrén, E., Louwye, S. and Matsuoka, K. (2012), 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. J. Quaternary Sci., 27: 734–744. doi: 10.1002/jqs.2564
- Issue published online: 8 OCT 2012
- Article first published online: 21 AUG 2012
- Manuscript Accepted: 28 MAY 2012
- Manuscript Revised: 20 MAY 2012
- Manuscript Received: 21 MAR 2012
- Effingham Inlet;
- sediment trap;
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.