Aquatic biological systems are a critical part of the structure and function of earth's biosphere. While attention of the scientific community is often focused on the reaction of biological systems to changes in the environment, these systems also have profound effects, or actions, on the environment. Throughout the evolutionary history of earth, the rise and/or fall of different aquatic biosystems has impacted the character of the biosphere. At no time have environmental changes been more important to all life on earth than in the modern era, which underscores the need for the new journal, Aquatic Biosystems. We welcome submission of original research manuscripts, reviews, and commentaries to the journal.