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Flashcards in Quantifying And Measuring Biodiversity Deck (15)
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1

What does vegetation affect?

Temperature, humidity, light and wind speed

2

What controls biodiversity?

In the environment it’s the physical structure and the nutrition/resources that affects and controls biodiversity

Also competition

3

What does the plant dominance index measure and who invented it?

Gives a measure of the competitive ability of plant species and tells you if it will take over an environment

Phillip Grime

4

Give some examples of dominant plant species

Nettle (Urtica dioca)

Bracken (Pteridium aquilinium)

Rose bay willow herb

5

What 4 aspects are taken into account when calculating the dominance index?

1. Growth rate
2. Potential height
3. Potential for lateral spread
4. Litter production

6

How do you calculate the dominance index?

Species are given a score of 1-5 on each character

The score is summed and divided by 2 to give a score out of 10

7

Give an example of controlling plant dominance

Rhinanthus minor (Hay rattle)

Prevents grasses in meadows becoming too dominant, allowing other plant species to grow

8

What is the diversity index?

Measure of the number of species/families/genera and number of individuals of each

Evenness= dominance of species

9

On the k-dominance curve what do you plot and where?

Different species: x axis
Abundance of each species: y axis

10

What does Shannon diversity calculate?

The proportion of all individuals that belong to each species

11

Where do natural communities usually fall on the Shannon diversity?

H’= 1.5-3.5

12

What does Simpson dominance index measure?

The degree of dominance by a few species in the sample

13

What does island biogeography take into account?

Rates of migration and dispersal
Controls on species richness
Isolation
Relationship between the number of species, the size of the island and the distance from neighbours

14

What is colonisation and extinction dependent on?

The emergence of new ecosystems

Linkage between plants and animals

15

Give an example of a case study that demonstrates colonisation

Rakata

Largest remnant of volcanic eruption of Krakatau 1883

Also Hawaiian islands