Evaluation of the index of biotic integrity and its use describing the fisheries community in Bell Creek, Delaware County IN : an honors thesis (HONRS 499)

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Authors
Beier, Andrea K.
Jones, Melissa R.
Advisor
Lauer, Thomas E.
Issue Date
2002
Keyword
Degree
Thesis (B.?.)
Department
Honors College
Other Identifiers
Abstract

The objective of this study was to compare Index of Biotic Integrity (IBI) with Qualitative Habitat Evaluation Index (QHEI) scores of Bell Creek, Delaware and Henry IN counties. Twelve sites were chosen spaced approximately evenly along Bell Creek from the mouth upstream to the headwaters. At each site, we evaluated the aquatic habitat using standard QHEI methodology. Collecting fish samples followed IBI protocol and used a backpack electrofishing unit. IBI scores were lowest at the most upstream station, while scores downstream (>3.6 mi2) appeared due more to changes in other aspects of the habitat, as defined by the QHEI score for that particular site. Thus, lower IBI scores in our sample may be due to low QHEI scores calculated at sites that had previously been channelized or influenced by other anthropogenic events. This suggests that habitat has a greater influence on IBI scores than drainage area and current IBI methodology may need to be reevaluated based upon habitat classification.