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

Kenneth Neil Mertens, Manuel Bringué, Nicolas van Nieuwenhove, Yoshihito Takano, Vera Pospelova, André Rochon, Anne de Vernal, Taoufik Radi, Barrie Dale, R. Timothy Patterson, Kaarina Weckström, Elinor Andrén, Stephen Louwye, Kazumi Matsuoka

Research output: Contribution to journalArticleResearchpeer-review

41 Citations (Scopus)

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: σ t annual=-0.8674×average process length+1029.3 (R2=0.84), with a standard error of 0.78kgm-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 ( 2=0.86), with a standard error of 3.09kg -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.

Original languageEnglish
Pages (from-to)734-744
Number of pages11
JournalJournal of Quaternary Science
Volume27
Issue number7
DOIs
Publication statusPublished - Oct 2012

Keywords

  • Baltic-Skagerrak
  • Effingham Inlet
  • Sediment trap
  • SSS
  • SST

Programme Area

  • Programme Area 5: Nature and Climate

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