What trophic level does a Ribbed mussel have?

Ribbed mussels (Geukensia demissa) primarily occupy the herbivore trophic level as they are filter feeders that consume phytoplankton and detritus from the water. They play a crucial role in their ecosystems by helping to filter and clean the water, thus supporting higher trophic levels. Additionally, they can be considered a food source for various predators, such as birds and crabs, placing them in the lower levels of the food web.