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Temperature and Winter Duration Requirements for Reproductive Success in Johnny Darter, Etheostoma nigrum (Percidae), in the South Platte River Basin, Colorado


September 2018 - June 2021


Water temperature is a critical ecological variable and changes in water temperature and its seasonal timing may influence biological processes in aquatic ectotherms. Historically, the South Platte River Basin naturally experienced a wide range of seasonal temperatures However, urbanization and development of Waste Water Treatment Plants have contributed to warmer and more consistent water temperatures throughout the year, particularly in winter months. Less variation in seasonal temperatures could have adverse effects on native fishes that previously relied on temperature fluctuations for important biological processes, such as reproduction. Assessing the thermal requirements of warm water fishes will provide valuable information towards establishing protective winter water temperature standards in effluent-dominated streams.


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Funding Agencies

  • CO Division of Parks and Wildlife


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey