期刊
JOURNAL OF PHYCOLOGY
卷 47, 期 5, 页码 1164-1176出版社
WILEY
DOI: 10.1111/j.1529-8817.2011.01053.x
关键词
biogeography; coccolithophore; Emiliania huxleyi; mitochondrial DNA; morphotype
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Japan Society for the Promotion of Sciences [20740296]
- EU [FP7/2007-2013, FP7/227799]
- Grants-in-Aid for Scientific Research [23370038, 20740296, 23540550] Funding Source: KAKEN
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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