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Language: French.

This guide contains 499 marine phytoplankton species which were identified, measured, and photographed. The phytoplankton groups observed comprised diatoms (142 taxa), dinoflagellates (137 taxa), flagellates, including cryptophytes (7 taxa), chrysophytes (16 taxa), euglenoids (3 taxa), prasinophytes (23 taxa) and prymnesiophytes (39 taxa), as well as some of the most common species of protozoa (123 taxa) including heterotrophic flagellates, choanoflagellates, and ciliates. It also includes a brief description of all the species identified along with 159 photographic plates made of 1200 light and electron microscope photomicrographs. Measurements, taxonomic references, and distribution of the species in the St. Lawrence are also included.