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Module 3: Biodiversity and Evolution

2.3.1 ­ Biodiversity
Biodiversity ­ The number and variety of living things to be found in the world, in an ecosystem or in a
habitat. The variety of habitat communities and species in an area and the genetic diversity within
populations. It consists of:
Genetic…

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Random sampling ­ can miss plants that occur only infrequently (present species but will no
abundance)
Visual survey of the habitat will view plants that may have been missed by random sampling
Qualitative data ­ not used in statistical analysis



Using random quadrats:
Quadrat ­ square frame used to define…

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Light trap
Collect flying insects at night
Ultraviolet light attracts the insects
Under the light is a collecting vessel containing alcohol
Moths and other insects attracted to the light fall into the alcohol

Species richness
The number of species present in a habitat
More species present -> richer the habitat…

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