Lecture Twelve - Rarity and Red Listing Flashcards Preview

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Flashcards in Lecture Twelve - Rarity and Red Listing Deck (37)
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1

What might habitat specitivity influence about a species' range?

How widely a species exists within its geographic range.

2

What is the extent of occurrence?

The total area that is included within the limits of the geographic range.

3

What is the area of occupancy?

Thea area where populations of the species occur within the geographic range.

4

What can be said about specialist species for a given size of geographic range?

They have a smaller area of occupancy

5

Give the combination that produces a common species.

- Large geographic range
- Low habitat specitivity (being a generalist)
- Large population size

6

Who said that rarity is the precursor to extinction?

Darwin

7

In the IUCN Red List, how often are species assessed?

Every 5 years

8

When can a species be declared extinct?

When there is no doubt that the last individual has died after systematic exhaustive surveys

9

Give a species that is extinct in the wild.

Scimitar-horned Oryx

10

Give the three categories of threatened species.

- Critical
- Endangered
- Vulnerable

11

Give the risk of extinction of threatened species.

Minimum risk of extinction of 10% probability within 100 years.

12

Give the probability of extinction of critically endangered species.

50% probability in 5 years

13

Give the probability of extinction of endangered species.

20% probability in 20 years

14

Give the probability of extinction of vulnerable species.

10% probability in 100 years

15

What is Criteria A for a threatened species?

Reduction in population size

16

How many ways are there in which criteria A for extinction can be defined?

Four

17

Name a species that qualifies as critically endangered under Criteria A.

Indian Gharial
>80% reduction in population size leading up to 2007.

18

What is Criteria B for a threatened species?

Decline of distribution or fluctuation

19

How many categories of Criteria B are there?
How many must it meet?

There are 3 categories.
It must meet 2.

20

What is criteria C for threatened species?

Small population size and decline

21

Under what criteria does the Indian Gharial qualify as endangered?

A and C

22

What is criteria D for threatened species?

Very small or restricted - less than 50 mature individuals.

23

What is criteria E for critically endangered species?

A probability of extinction of 50% over 10 years/3 generations

24

By what criteria does Nassau Grouper class as endangered?

Criteria A

25

By which criteria does Ascension frigatebird class as vulnerable?

Criteria D

26

How does a species qualify as Near Threatened or Least Concern?

No evidence of over 10% extinction risk in 100 years.

27

Give a Near Threatened UK species.

Common Otter

28

Give the definition for Near Threatened.

Close to qualifying for a threatened category and likely to qualify in the future.

29

When did otters become Near Threatened?

2004

30

Give an example of two Least Concern species.

- Long Tailed Tit
- Eurasian Badger