What are 2 determinants of species richness?

What are 2 determinants of species richness?

Many factors affect small-scale species richness, including geographic (e.g. species pool, dispersal), biotic (e.g. competition, predation, facilitation) and abiotic (e.g. resource availability, environmental heterogeneity, disturbance frequency and intensity).

What is meant by species richness?

Species richness is simply the number of species in a community. Species diversity is more complex, and includes a measure of the number of species in a community, and a measure of the abundance of each species. Species diversity is usually described by an index, such as Shannon’s Index H’.

What scale is species richness?

This encapsulated first what he termed inventory diversity, or simply richness, assessed at four scales: (1) point scale (2) alpha (3) gamma (landscape), and (4) epsilon (regional). Secondly, it encapsulated a separate phenomenon, compositional turnover.

What causes higher species richness?

Species richness increases with habitat area and heterogeneity.

What are the 4 main factors that affect species richness?

Such factors include climatic variability, the input of energy, the productivity of the environment, and possibly the ‘age’ of the environment and the ‘harshness’ of the environment.

How is species richness measured?

Species richness may be measured by dividing the total number of species by the total area of the defined ecosystem.

What determines species richness?

Species richness is often determined by dividing the number of species observed by the total area of the defined ecosystem.

Why do we measure species richness?

Species Richness: This biodiversity index is commonly used because it is a quick way to differentiate between different locations, ecosystems, or populations of organisms. It is a calculation of the total number of species in a particular place.

How do you compare species richness?

Key to be able to compare richness is the availability of sample size and/or species abundances. This allows you to build the species-area curves.

What does high species richness mean?

Species richness is the number of species within a community or area. For example, if we have two plots of lands, A and B, and plot A has twenty four species of plants and plot B has eighty four species of plants, plot B has higher species richness.

What are the main determinants of species richness?

The factors related to these patterns of small- scale species richness include (1) geographic factors such as scale of observation, available species pool and dispersal patterns, (2) biotic factors such as competition or predation and (3) abiotic environmental factors such as site resource availability, disturbance and …

What does Shannon index measure?

The Shannon diversity index (a.k.a. the Shannon–Wiener diversity index) is a popular metric used in ecology. It’s based on Claude Shannon’s formula for entropy and estimates species diversity. The index takes into account the number of species living in a habitat (richness) and their relative abundance (evenness).