7.42 Index of Biotic Integrity. The OHIO Environmental Protection Agency used the Index of Biotic Integrity (IBI) to measure the biological condition or health of an aquatic region. The IBI is the sum of metrics which measure the presence, abundance, and health of fish in the region. (Higher values of the IBI correspond to healthier fish populations.) Researchers collected IBI measurements for sites located in different OHIO river basins. (Journal of Agricultural, Biological, and Environmental Sciences, June 2005.) What is the purpose of the Index of Biotic Integrity (IBI)?
1) To measure the biological condition or health of an aquatic region
2) To measure the presence, abundance, and health of fish in the region
3) To collect IBI measurements for sites located in different OHIO river basins
4) To determine the sum of metrics for fish populations
