AQA A Level Biology复习笔记4.6.2 Species Richness
Species Richness
- Species richness?is the?number?of species within a community
- A community is a group of populations of?different species?living in the same place at the same time that?interact with each other
- Species richness is the simplest way to measure?species diversity
- A community with a greater number of species will have a greater species richness score
- For example, a tropical rain forest has a very high number of different species so it would be described as?species-rich
- Species richness can be a?misleading?indicator of diversity as it does not take into account the?number of individuals?of each species
- For example, habitat A has 10 different plant species and habitat B has 7 different plant species
- Habitat A would be described as being more species-rich than habitat B
- However, in habitat A there is only one individual of each plant species present (10 individuals present) while in habitat B there are over 20 individuals of each species present (over 140 individuals present)
- This example illustrates the limitations of species richness
- Conservationists often favour the use of an?index of diversity?as it takes into account species number and evenness
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