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Updated: Jul 11, 2026

Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton
Published on: July 28, 2023
Extensive dinoflagellate phylogenies indicate infrequent marine-freshwater transitions
Ramiro Logares1, Kamran Shalchian-Tabrizi, Andrés Boltovskoy
1Limnology Section, Department of Ecology, Lund University, Ecology Building, SE-223 62 Lund, Sweden. Ramiro.Logares@limnol.lu.se
Abstract:
We have constructed extensive 18S-28S rDNA dinoflagellate phylogenies (>200 sequences for each marker) using Maximum Likelihood and Bayesian Inference to study the evolutionary relationships among marine and freshwater species (43 new sequences). Our results indicated that (a) marine and freshwater species are usually not closely related, (b) several freshwater species cluster into monophyletic groups, (c) most marine-freshwater transitions do not seem to have occurred recently and, (d) only a small fraction of the marine lineages seem to have colonized fresh waters. Thus, it becomes apparent that the marine-freshwater boundary has acted as a barrier during the evolutionary diversification of dinoflagellates. Our results also shed light on the phylogenetic positions of several freshwater dinoflagellates which, to date, were uncertain.
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