Organisms were separated into broad taxonomic groups: amphipods, isopods, tanaids, polychaetes, copepods, unknowns, and other organisms that could be identified but were less abundant, such as gastropods, bivalves, and nematodes (called “others”). In addition, invertebrates were categorized into four main life history stages: immature organisms, adults (males and females without eggs), females with eggs, and unknowns.