||Hanneke J. G. Baretta-Bekker, Egbert K. Duursma, Bouwe R. Kuipers
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The second edition has benefited from the comments by several reviewers. Based on their comments, omissions and errors have been corrected and the encyclopedia has been extended with entries on fishery biology and oceano-graphic expeditions. The taxonomy of organisms and the description of taxo-nomical groups has been revised and updated. The five kingdoms classification is used throughout this edition. For one of these kingdoms, the Protoctista, the system of Margulis et al. is followed. However, taxonomy is a living science, and different views about the major classifications of organisms do exist and are used in textbooks. Our approach induced some major changes in comparison with the first edition, especially within the unicellular groups. Some major group names of older or other classification systems are still preserved in the list. The descriptions of the different taxonomical groups had to be kept general and short, and could not include exceptions to the general pattern. We appreciated the good cooperation with Springer-Verlag, and trust that this concise Encyclopedia will be useful for educational and general purposes. Of course, an encyclopedia is never complete. We hope we have made a relevant selection of entries, but will be happy to receive comments and additions for possible future editions.