Intertidal Mussel (Mytilus) Data from Prince William Sound, Katmai National Park and Preserve, and Kenai Fjords National Park

These data are part of the Gulf Watch Alaska (GWA) long-term monitoring program and describe mussel sampling and observations conducted in the northern Gulf of Alaska. This dataset consists of six comma separated files (.csv): 1) mussel sampling site layout information, 2) mussel counts for mussels greater than 20 millimeters in a quadrat, 3) mussel size measurements for mussels greater than 20 millimeters in a quadrat, 4) mussel counts for all mussels collected from core samples, 5) mussel size frequencies for all mussels collected from core samples, and 6) list of Gulf Watch Alaska principal investigators and collaborators.

This dataset includes previously released data and supersedes that USGS data release (https://doi.org/10.5066/F7WS8RD4).

Version History:
First release: August 2016
Revised: July 2022 (ver. 2.0)
Revised: September 2022 (ver. 3.0)
Revised: April 2024 (ver. 4.0)
Revised: August 2024 (ver. 5.0)
Revised: September 2025 (ver. 6.0)