A high index value suggests a stable site with many different niches and low competition (high richness and evenness) A low index value suggests a site with few potential niches where only a few species dominate (low richness and evenness)
What does a high biodiversity index tell you about an ecosystem?
An ecosystem with a high level of biodiversity is more resistant to environmental change and to human impacts. The Species Richness index is the most common type of biodiversity index. It is the number of different species present in an area. The more species are present in a sample, the ‘richer’ the area.
What is a high biodiversity number?
total number of objects (evenness) This should give you a number between 0 and 1. Using this index, numbers closer to 0 indicate a low biodiversity while numbers. closer to 1 indicate a high biodiversity. For this example, the biodiversity index is 0.333.
Why is it important to have a high biodiversity index?
Biodiversity boosts ecosystem productivity where each species, no matter how small, all have an important role to play. … A larger number of plant species means a greater variety of crops. Greater species diversity ensures natural sustainability for all life forms.
Does a higher value of diversity index mean?
Diversity indices are statistics used to summarize the diversity of a population in which each member belongs to a unique group. … This normalizes the Shannon diversity index to a value between 0 and 1. Note that lower values indicate more diversity while higher values indicate less diversity.
What is the index of biodiversity?
Scientists use a formula called the biodiversity index to describe the amount of species diversity in a given area. A simple biodiversity index is calculated as follows: number of species in the area ÷ total number of individuals in the area = biodiversity index.
How do you interpret the biodiversity index?
This figure would represent a community containing only one species. The higher the value, the greater the diversity. The maximum value is the number of species (or other category being used) in the sample. For example if there are five species in the sample, then the maximum value is 5.
What is an example of high biodiversity?
Example of ecosystem with high biodiversity is tropical rain forest as seen in Amazon basin of south America. Such forests are also thriving in parts of central Africa and also in islands of Indonesia. In marine environment, coral reefs are example of high biodiversity aquatic ecosystems.
What does Simpson index mean?
Simpson’s Diversity Index is a measure of diversity which takes into account the number of species present, as well as the relative abundance of each species. As species richness and evenness increase, so diversity increases. … With this index, 1 represents infinite diversity and 0, no diversity.
What happens when there is high biodiversity?
Greater biodiversity in ecosystems, species, and individuals leads to greater stability. For example, species with high genetic diversity and many populations that are adapted to a wide variety of conditions are more likely to be able to weather disturbances, disease, and climate change.
What are the 3 types of biodiversity?
Usually three levels of biodiversity are discussed—genetic, species, and ecosystem diversity.
What are the 4 types of biodiversity?
Four Types of Biodiversity
- Species Diversity. Every ecosystem contains a unique collection of species, all interacting with each other. …
- Genetic Diversity. Genetic diversity describes how closely related the members of one species are in a given ecosystem. …
- Ecosystem Diversity. …
- Functional Diversity.
Why is index of diversity useful?
Importance: Diversity indices provide important information about rarity and commonness of species in a community. … The proportion of species i relative to the total number of species (pi) is calculated, and then multiplied by the natural logarithm of this proportion (lnpi).