How do you calculate biological index?
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- Example of Biotic Index Calculation. Using Macroinvertebrate Information.
- If you find:
- Mayflies. Caddisflies. Stoneflies. Scuds. Midge larva.
- Multiply each by the Biotic Value:
- Biotic Value. Mayflies. 25 x 10 = 250. Caddisflies. 15 x 10 = 150.
- TOTAL = 820. Divide total by 10. This is the Biotic Index Value: 820/10 = 82.
What does the biotic index measure?
A biotic index is a scale for showing the quality of an environment by indicating the types and abundances of organisms present in a representative sample of the environment. It is often used to assess the quality of water in marine and freshwater ecosystems.
What is a biotic value?
Biotic Index is a scale for showing the quality of an environment by indicating the types of organisms present in it. A worksheet is then used to calculate the final value or score of all the organisms found. Depending upon the worksheet’s equations, the score determines the condition of the water quality.
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).
How is BMWP score calculated?
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 does a higher biotic index mean?
A high biotic index indicates the presence of many pollution-sensitive organisms, denoting an unpolluted environment. A low biotic index indicates a polluted environment, due to a relative abundance of pollution-tolerant organisms.
What does Hilsenhoff biotic index measure?
The Hilsenhoff Biotic Tolerance Index is a diagnostic metric used to identify samples with a high degree of pollution tolerant organisms. This index is on a scale from 0 to 10 with higher values indicating more tolerant organism, and more polluted conditions.
How is BMWP and Aspt calculated?
The ASPT is calculated by dividing the Biological Monitoring Working Party (BMWP) score (Table 2) calculated by adding the individual scores of all indicator organisms present by the number of families present.
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).
How is the biodiversity index of an area calculated?
A simple biodiversity index is calculated as follows: number of species in the area ÷ total number of individuals in the area = biodiversity index. For example, a 4 X 4 meter square area in a carrot patch has 300 carrot plants, all the same species.
How do you calculate your body mass index?
Calculate Your Body Mass Index. Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. View the BMI tables or use the tool below to compute yours. Enter your weight and height using standard or metric measures. Select “Compute BMI” and your BMI will appear below.
How is the biotic index used in the real world?
From Wikipedia, the free encyclopedia A biotic index is a scale for showing the quality of an environment by indicating the types and abundances of organisms present in a representative sample of the environment. It is often used to assess the quality of water in marine and freshwater ecosystems.
How is the formula for indexation calculated in Excel?
The formula for indexation can be simply derived by dividing the value of any subject good in any given year by the value of the same good in the base year and then the result is multiplied by 100. Mathematically, it is represented as, Let’s take an example to understand the calculation of Indexation in a better manner.