Rocky intertidal monitoring: 2021–2022 results from Redwood National and State Parks

Monitoring of rocky intertidal ecosystems in Redwood National and State Parks from 2021 to 2022 revealed dynamic changes in populations of key species, including sessile invertebrates, algae, ochre sea stars (Pisaster ochraceus), surfgrass (Phyllospadix spp.), and sea palm (Postelsia palmaeformis). The study, part of the Multi-Agency Rocky Intertidal Network (MARINe) and funded by the National Park Service, employed permanent plots and transects to track annual trends. While populations fluctuated, the data contribute to long-term biodiversity assessments, with broader analyses available in 5-year trend reports. The study also incorporated optional MARINe protocols, though some measurements may be discontinued in future years.

Cox-Ammann, K., Cortez, M., Dinger, E., & Necarsulmer, A. (2025). Rocky intertidal monitoring: 2021–2022 results from Redwood National and State Parks (, Ed.). National Park Service. https://doi.org/10.36967/2309092