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New evidence for morphological and genetic variation in the cosmopolitan coccolithophore Emiliania huxleyi (Prymnesiophyceae) from the cox1b‐atp4 genes
Hagino, K.; Bendif, E.M.; Young, J.R.; Kogame, K.; Probert, I.; Takano, Y.; Horiguchi, T.; de Vargas, C.; Okada, H. (2011). New evidence for morphological and genetic variation in the cosmopolitan coccolithophore Emiliania huxleyi (Prymnesiophyceae) from the cox1b‐atp4 genes. J. Phycol. 47(5): 1164-1176. https://dx.doi.org/10.1111/j.1529-8817.2011.01053.x
In: Journal of Phycology. Blackwell Science: New York. ISSN 0022-3646; e-ISSN 1529-8817, more
Peer reviewed article  
Available in  Authors 
Keywords
    Geography > Biogeography
    Emiliania huxleyi (Lohmann) W.W.Hay & H.Mohler, 1967 [WoRMS]
Author keywords
    coccolithophore, mitochondrial DNA, morphotype
Authors  Top 
  • Hagino, K.
  • Bendif, E.M.
  • Young, J.R.
  • Kogame, K.
  • Probert, I.
  • Takano, Y.
  • Horiguchi, T.
  • de Vargas, C.
  • Okada, H.
Abstract
    Emiliania huxleyi (Lohmann) W. W. Hay et H. Mohler is a cosmopolitan coccolithophore occurring from tropical to subpolar waters and exhibiting variations in morphology of coccoliths possibly related to environmental conditions. We examined morphological characters of coccoliths and partial mitochondrial sequences of the cytochrome oxidase 1b (cox1b) through adenosine triphosphate synthase 4 (atp4) genes of 39 clonal E. huxleyi strains from the Atlantic and Pacific Oceans, Mediterranean Sea, and their adjacent seas. Based on the morphological study of culture strains by SEM, Type O, a new morphotype characterized by coccoliths with an open central area, was separated from existing morphotypes A, B, B/C, C, R, and var. corona, characterized by coccoliths with central area elements. Molecular phylogenetic studies revealed that E. huxleyi consists of at least two mitochondrial sequence groups with different temperature preferences/tolerances: a cool‐water group occurring in subarctic North Atlantic and Pacific and a warm‐water group occurring in the subtropical Atlantic and Pacific and in the Mediterranean Sea.
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