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If very little is known about microbial oceanic diversity (Falkowski and de
Vargas 2004), our knowledge of speciel-level evolution (speciation,
biogeography, population structures) in the marine plankton is even poorer.
Most classical planktonic morphological "species" occupy huge biogeographic
provinces, sometimes circumglobal, bipolar or even cosmopolitan, but recent
molecular studies have shown that most -if not all- classical planktonic
species are in fact assemblages of sibling biological species with poor
morphological divergence (de Vargas et al. 2004).
How many sibling species are there within a morphological taxon? How old are
the biological species in the plankton? Where do they live, and how did they
speciate? Which factors control the creation, maintenance, and extinction of
species in the pelagial? The
planktonic
foraminifers and
coccolithophores
represent ideal groups to answer those fundamental question. |
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