Benthic data have been compiled from various sources including U.S. EPA Great Lakes National Program Office (GLNPO), NOAA Great Lakes Environmental Research Laboratory (GLERL), and targeted lake monitoring activities, such as the Cooperative Science and Monitoring Initiative, Lake Erie Forage Task Group, and the Lake Michigan Mass Balance. The data indices calculated by the GLAHF project include Oligocheata Trophic Index (OTI), Chironomidae Trophic Index (CTI), Shannon index of diversity, Simpson index of diversity, Pielou eveness index, taxa richness, Oligochaetae abundance, Chironomidae abundance, Bivalves abundance, Diporeia abundance, Dressenidae abundance, proportion of Oligochatae, ratio of Oligochaetae / Chironomidae.
download benthos locations & metadata
Fish species locations, community, and spawning data have been compiled from USGS trawl surveys, Lake Erie cooperative state and provincial sampling, Michigan Dept. of Natural Resources, and the Goodyear Spawning Atlas and additional published spawning locations. Depending on the lake and available data some of the fish species metrics such as, CPUE, taxa richness, and diversity indices.
download link for fish presence database coming soon – coming soon!
download Goodyear Spawning Atlas Plus locations
Invasive species are a possible threat to the Great Lakes ecosystem. The GLAHF project has been working with collaborators to incorporate known invasives data into the spatial database. USGS and Michigan Tech Research Institute (MTRI) partnered to create data layers showing areas of coastal Phragmites in the Great Lakes Basin. Aquatic invasive species occurrence records are from the Great Lakes Aquatic Nonindigenous Species Information System (GLANSIS), and include occurrences of algae, crustaceans, fishes, mollusks, plants, protozoans, reptiles, and viruses. See benthos, fish, and zooplankton sections for more information about specific invasive species.
download Great Lakes GLANSIS data
Submerged Aquatic Vegetation
MTRI has developed satellite algorithms to interpret locations of submerged aquatic vegetation (predominately Cladophora). The Michigan Dept. of Natural Resources Lake St. Clair Fisheries Research Station collected submerged aquatic vegetation plant surveys and GLAHF interpolated the data to create SAV maps.
download link for Lake St. Clair SAV
To date zooplankton from the Lake Erie Forage Task Group and the Lake Ontario Lower Foodweb Assessment (LOLA) are available. We are waiting to incorporate data from the U.S. EPA Great Lakes National Program Office (GLNPO), and National Coastal Condition Assessment.
download link for zooplankton database – coming soon!