How do you calculate biotic index?

How do you calculate biotic index?

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  1. Example of Biotic Index Calculation. Using Macroinvertebrate Information.
  2. If you find:
  3. Mayflies. Caddisflies. Stoneflies. Scuds. Midge larva.
  4. Multiply each by the Biotic Value:
  5. Biotic Value. Mayflies. 25 x 10 = 250. Caddisflies. 15 x 10 = 150.
  6. TOTAL = 820. Divide total by 10. This is the Biotic Index Value: 820/10 = 82.

How is EPT calculated?

EPT Index is the total number of Ephemeroptera (mayflies), Plecoptera (stoneflies), and Trichoptera (caddisflies) divided by the total number of individuals across all taxa. In general, the more EPT taxa, the better the water quality.

What is biological pollution index?

The biological index of pollution (BIP) which hinges on the responses of aquatic biota to pollution of water sources was used to assess the quality of some water sources in Zaria area, Nigeria. Collections from the lakes was by means of dragging net over a 3 meter distance in the water.

What is the BMWP biotic index?

BMWP biotic index is one of the most commonly used biotic index based on benthic macroinvertebrates in Europe. Many countries, even out of Europe, use this index by modifying it according to the benthic macroinvertebrate fauna that adapts to their running water ecosystems.

How do you calculate family biotic index?

The FBI is calculated by multiplying the number in each family by the tolerance value for that family (Table 1), summing the products, and dividing by the total arthropods in the sample (Hilsenhoff 1988).

What is a good biotic index?

Biotic indices based on the classification of species into groups of tolerance and/or associated to diversity have been used to track anthropogenic change….Data Analyses.

Family Biotic Index Water Quality
0.00–3.75 Excellent
3.76–4.25 Very good
4.26–5.00 Good
5.01–5.75 Fair

How do you interpret EPT index?

The EPT Index is the total number of distinct taxa within the groups, Trichoptera, Ephemeroptera, and Plecoptera. For example, if five species of Ephemeroptera (mayflies), five Plecoptera (stoneflies), and two Trichoptera (caddisflies) are found at a site, the total number of EPT taxa and Index would equal 12.

What Is percent EPT?

Percent EPT is the total number of EPT individuals divided by the total number of individuals in the sample. The HBI is based on an organism’s relative sensitivity to stream-quality conditions.

What is the definition of Bioindicators?

Bioindicators are living organisms such as plants, planktons, animals, and microbes, which are utilized to screen the health of the natural ecosystem in the environment. They are used for assessing environmental health and biogeographic changes taking place in the environment.

What are the biological indicators of pollution?

Lichens (a symbiosis among fungi, algae, and/or cyanobacteria) and bryophytes (mosses and liverworts) are often used to assess air pollution.

What does a high BMWP score mean?

The BMWP score equals the sum of the tolerance scores of all macroinvertebrate families in the sample. A higher BMWP score is considered to reflect a better water quality. Alternatively, also the Average Score Per Taxon (ASPT) score is calculated.

What is a high BMWP score?

A high BMWP Score -or Biotic Index -as it is sometimes called, means the invertebrate is very sensitive to pollution, therefore, for the invertebrate to be present – the water must be clean. An example of an animal that has a very high Biotic Index is a Mayfly nymph (its biological name is Ephemeroptera).