Unit 3 Topic 1 Recap

A group of the same species that live in a particular area at the same time is know as

• A community

• A population

• An ecosystem

• A niche

Define an ecosystem.

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You are designing an experiment where you want to measure the biodiversity of a desert in which the only plant is spinifex. The best measure of biodiversity in this case is

• Species richness

• Relative species abundance

• Percentage cover

• Simpson's Diversity Index

Answer explanation

Because you only have 1 species (spinifex), the best measure is percentage cover. If you had more than 1 species present (also cactus, trees etc) then you would use other measures

What is the difference between species richness and species evenness?

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Calculate species richness for the given data set.

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Describe the benefit of using Simpson's diversity index over Species Richness as a measure of biodiversity.

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Use the data set to calculate Simpson's Diversity Index (SDI).

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Two different ecosystems were sampled and the SDI calculated. Ecosystem 1 SDI = 0.9 whereas Ecosystem 2 SDI = 0.3. Infer which ecosystem has greater biodiversity.

• Ecosystem 1 has greater biodiversity because 0.9 < 0.3

• Ecosystem 1 has greater biodiversity because 0.9 > 0.3

• Ecosystem 2 has greater biodiversity because 0.9 < 0.3

• Ecosystem 2 has greater biodiversity because 0.9 > 0.3

What is the commonly accepted threshold for statistical significant in a t-test?

• 0.1

• 0.5

• 0.05

• 0.005

Draw your favourite animal