Tidal Plankton Data (1984–present): Zooplankton and phytoplankton community composition, abundance, and biomass at fixed mainstem and tidal tributary stations.

Tidal Benthic Data (1971–present): Benthic macroinvertebrate community composition, abundance, biomass, and Chesapeake Bay Benthic Index of Biotic Integrity (B-IBI) scores at fixed and stratified random stations in the mainstem and tidal tributaries. Includes accompanying sediment and water quality data.

Nontidal Benthic Data (1991–2024): Benthic macroinvertebrate community composition, abundance, and Chesapeake Basin-wide Index of Biotic Integrity (Chessie BIBI) scores at wadeable streams and rivers across the Chesapeake watershed. Includes accompanying water quality and habitat assessment data.

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• The Living Resources Data Lookup Tables Excel file provides additional information on the acronyms and codes used in all Living Resources datasets.
• Find metadata files, maps, and additional documentation at the Data Documentation page.