Biological studies along the Colorado River in the Grand Canyon focus on native fish, riparian vegetation, aquatic invertebrates, and the overall health of the ecosystem, particularly in response to the impacts of the Glen Canyon Dam.

Researchers use USGS data and community science to monitor changes in water flow, food webs, and species responses to management actions. These studies track shifts in biodiversity, vegetation growth, and insect populations, providing critical information for adaptive management of this unique, dam-altered environment.

Populations, migration patterns, and food sources are closely monitored for native fish species such as humpback chub, flannelmouth sucker, and bluehead sucker, which are key indicators of ecosystem resilience. These studies aim to understand how the Colorado River functions under managed conditions and to inform strategies for conserving its distinctive and valuable natural resources.