The biological condition gradient: a descriptive model for interpreting change in aquatic ecosystems.

@article{Davies2006TheBC,
  title={The biological condition gradient: a descriptive model for interpreting change in aquatic ecosystems.},
  author={Susan P. Davies and Susan K. Jackson},
  journal={Ecological applications : a publication of the Ecological Society of America},
  year={2006},
  volume={16 4},
  pages={1251-66}
}
The United States Clean Water Act (CWA; 1972, and as amended, U.S. Code title 33, sections 1251-1387) provides the long-term, national objective to "restore and maintain the ... biological integrity of the Nation's waters" (section 1251). However, the Act does not define the ecological components, or attributes, that constitute biological integrity nor does it recommend scientific methods to measure the condition of aquatic biota. One way to define biological integrity was described over 25… CONTINUE READING

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