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Learning Targets “I Can…” • Measure biodiversity in a simulated grassland habitat • Take random samples to “count” species within a habitat • Create and interpret a species accumulation graph to illustrate the species richness of a habitat. Measuring Biodiversity Ecosystem Diversity • Different types of plants and animals live in different habitats • To measure the biodiversity of an ecosystem, we will use the concept of species richness, which is the number of species in a given area Species Richness • When measuring species diversity, the first few samples taken will have a lot of common and abundant species • As more samples are collected, there be fewer and fewer new species found, until eventually, all species have been counted Species Richness Curve Species Richness It will take a lot of effort to find more species. We can still find more species pretty easily! Measuring Species Diversity • Although not completely accurate, most of an ecosystem’s biodiversity can be measured by taking a only a few random samples Results SAMPLE 1 2 3 4 5 6 7 8 9 10 TRIAL 1 TRIAL 2 TRIAL 3 ACCUMULATION OF HOW MANY NEW SPECIES YOU FOUND Results Species Accumulation Curve of Simulated Grassland 12 10 8 Number of Species 6 Found 4 2 0 1 2 3 4 5 6 7 Number of Random Samples 8 9 10 References • http://www.denniskalma.com/river/biodiversi tymeasurement.html • http://gapanalysis.usgs.gov/species/reptilespecies-richness/