The state of biodiversity Flashcards
1
Q
Why was the Red List updated in 1990?
A
It was informal, easy to challenge; subjective, varied between groups
2
Q
What are the categories of the Red List?
A
- Data defficient
2. Scale of exinction risk
3
Q
What are the criteria within scale of extinction risk?
A
A. Population reduction B. Small distribution and fragmentation C. Small population and decline D. Very small or restricted population E. Quantitative analysis
4
Q
What are the pros of the Red List?
A
- Combination of lots of criteria to allocate categories
- Easy to use and understand
5
Q
What are the cons of the Red List?
A
- Inaccurate data
- Single species focus
- Threshold values - where do you draw the line?
- Would it be better to think on a habitat/population scale?
6
Q
What is the Red List Index?
A
For species that have been assessed multiple times
7
Q
What are the threatened extinction values for birds, mammals and amphibians?
A
Birds = 11% Mammals = 25% Amphibians = 33%