A count of the number of species in a given habitat or ecosystem.
Biodiversity vs Species Richness. Biodiversity and species richness are two different terms that are used in ecology yet those sound similar in meaning. In fact, the two terms are similar in one direction, but biodiversity means a lot more than just the number of species. Evenness is a measure of the relative abundance of the different species making up the richness of an area. To give an example, we might have sampled two different fields for wildflowers. The sample from the first field consists of 300 daisies, 335 dandelions and 365 buttercups. Species richness, very simply, is a count of the different species in a given ecosystem, region or particular area. You make the assumption that each organism constitutes a single species. Species richness is a count of the number of species in a given habitat or ecosystem. Unlike species diversity, species richness does not take species abundance into account. One factor which is important to consider when measuring species richness is sampling methodology. 1. Richness. The number of species per sample is a measure of richness. The more species present in a sample, the 'richer' the sample. Species richness as a measure on its own takes no account of the number of individuals of each species present. Both samples have the same richness (3 species) and the same total number of individuals (1000). However, the first sample has more evenness than the second. This is because the total number of individuals in the sample is quite evenly distributed between the three species. If you were to measure the species richness of a forest, you might find 20 bird species, 50 plant species, and 10 mammal species. Abundance is the number of individuals of each species. For example, there might be 100 mountain beavers that live in a forest. Definition. Species richness, very simply, is a count of the different species in a given ecosystem, region or particular area. You make the assumption that each organism constitutes a single species. Imagine a picture of a lake. For example, species richness is the number of different species present. However, diversity depends not only on richness, but also on evenness. Evenness compares the similarity of the population size of each of the
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