There are 27 groups of algae and invertebrates targeted for this program. Each taxon or species was selected for one or more of the following reasons:
- it is common and abundant at LiMPETS sites;
- it is near the edge of its northern or southern distribution limits (e.g., sunburst anemones and pink acorn barnacles);
- it is a major space competitor, predator, or herbivore (e.g., ochre sea stars and owl limpets);
- it is sensitive to trampling, harvesting, or pollution (e.g., owl limpets, flattened rockweed, and surfgrass);
- it is easy to recognize or to quantify in the field;
- it is fun to monitor and catches the interest of those persons with short attention spans.
LiMPETS follows the taxonomy of the World Register of Marine Species (WoRMS).