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Species Diversity Concepts Species Richness Species-area Curves Rarefaction Diversity Indices -simpson's Index -shannon-weiner Index -brillouin Index Species Abundance Models Describing Communities
| Content Provider | Semantic Scholar |
|---|---|
| Abstract | There are two important descriptors of a community: 1) its physiognomy (physical structure), as described in the previous lecture, and 2) the number of species present and their relative abundances (species richness and diversity). Species Richness The simplest way to describe a community is to list the species in it. Species richness (S) is the number of species on that list, and is most often used as the first pass estimate of diversity for a community. How would one generate such a list? A simple and widely used method is to define the boundaries of the community and then walk through it seasonally, noting all the species you encounter. This is what we call a flora. Species Richness While simply finding and listing the species is useful, this method has many limitations. If we wish to compare two or more communities, we need comparable samples, otherwise we might just find a difference because one was sampled more intensively than the other. This begs the question, how much sampling should we do in order to be confident that we have found most of the species in each community? Species-Area Curve One way to make this interpretation is through the use of a species-area curve. A graph of the total number of species found as the number of quadrats increases explains the relationship. We know that we have sampled sufficiently when the curve begins to "plateau". |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.ohio.edu/plantbio/staff/mccarthy/dendro/LEC5.pdf |
| Alternate Webpage(s) | https://www.ohio.edu/plantbio/staff/mccarthy/dendro/LEC5.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
