Trophic state index | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Trophic_state_index


00:01:44 1 Carlson's Trophic State Index
00:02:50 1.1 Index variable
00:05:35 2 Trophic classifications
00:06:47 2.1 Oligotrophic
00:08:00 2.2 Mesotrophic
00:08:34 2.3 Eutrophic
00:09:53 2.4 Hypereutrophic
00:11:00 3 Trophic index drivers
00:11:45 4 Management targets
00:12:31 5 See also



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SUMMARY
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Trophic State Index (TSI) is a classification system designed to rate bodies of water based on the amount of biological activity they sustain. Although the term "trophic index" is commonly applied to lakes, any surface body of water may be indexed.
The TSI of a body of water is rated on a scale from zero to one hundred. Under the TSI scale, bodies of water may be defined as:
oligotrophic (TSI 0–40, having the least amount of biological productivity, "good" water quality);
mesoeutrophic (TSI 40–60, having a moderate level of biological activity, "fair" water quality); or
eutrophic to hypereutrophic (TSI 60–100, having the highest amount of biological activity, "poor" water quality).The quantities of nitrogen, phosphorus, and other biologically useful nutrients are the primary determinants of a body of water's TSI. Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water bodies, so increased concentrations tend to result in increased plant growth, followed by corollary increases in subsequent trophic levels. Consequently, a body of water's trophic index may sometimes be used to make a rough estimate of its biological condition.