Anchialine pools are brackish water systems fed by subsurface groundwater (freshwater) and tides (sea water), with no surface connection to the ocean. Although anchialine pools occur around the world, these habitats tend to be small, isolated, and threatened by human development and introduced nonnative species. These pools provide habitat for rare invertebrate species including shrimp, snails, and odonates.The Pacific Island Network (PACN) is monitoring these unique ecosystems to determine status and trends over time. This will provide managers with information to determine how to best protect these unique habitats and the species they support. This dataset contains pilot data collected during the development of the anchialine pool monitoring protocol.

Park anchialine pool monitoring data collected by the resource management staff at Kaloko Honokahau National Historical Park are also included in the database. Each sampling event in the database is associated with a project. Those labeled as I&M Pilot Data are data associated with the I&M Monitoring Protocol. This dataset also includes water quality data imported from the PACN water quality monitoring protocol, the project is I&M Water Quality Monitoring Data. Information on the PACN water quality monitoring protocol can be found at https://irma.nps.gov/App/Reference/Profile/2166407. This data went through a vigorous data certification process, including verification and validation of the data. All others are data collected by park staff or outside researchers. The data verification and validation of this data is unknown.