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Aquatic Invertebrates

Epibenthic invertebratesTaxa richness in pump samples taken on top of the substrate from the low intertidal zone increased after enhancement and was highest at the pocket beach and habitat bench.  The habitat bench had high densities of harpacticoid copepods, amphipods, and overall epibenthic invertebrates, and the pocket beach also had high densities of harpacticoids.  Harpacticoids and amphipods are crustaceans that are generally important prey for juvenile salmon, although the most abundant amphipod species at the sites was not common in fish diets and was also abundant at the riprap site.

Benthic InvertebratesPocket beach sediments have been colonized by diverse benthic invertebrates, including several taxa of amphipods and polychaete worms that were not present before creation of the pocket beach.  Densities and taxa richness were high from core samples, with a community shift away from amphipod crustaceans since the first year of restoration and toward more worms in the low intertidal, and more snails, springtails, and isopods in the high intertidal.