Ecology and Composition of Phytoplankton in the Adriatic Sea provides information on a) environmental conditions that regulate pelagic production and other processes in the ocean; b) published and unpublished results on phytoplankton composition and distribution in the Adriatic Sea; c) the short phytoplankton cellular anatomy and d) illustrated catalogue of phytoplankton taxa, identified by light and electron microscopy, determined during the last 20 years of the author's research, mostly from the eastern part of the Adriatic Sea. Ecology and Composition of Phytoplankton in the Adriatic Sea provides a good starting literature for advanced research in ecology and phytoplankton diversity of the Adriatic Sea; especially for students studying marine microbiology and ecology.