2.7 - Biodiversity Flashcards
1
Q
What is the capture-recapture technique?
A
- capturing a no of individuals and marking them
- releasing them back into the wild
- take another sample and estimate the population by equation
2
Q
What’s the equation to calculate the total population no?
A
N= mc \ r M= number of marked on 1st visit C= number of captured on 2nd visit R= number of animals captured and marked on 2nd visit
3
Q
What is biodiversity?
A
The number of different species in a particular area
4
Q
What is an alien species?
A
An animal or plant that has been introduced into a country it does not originate from
5
Q
What are the problems with mark-release-recapture?
A
- won’t work for waterborne animals
- can’t wait for too long as population might change for birth and death
- have to mark without hurting organism
6
Q
Why is biodiversity important?
A
- food
- industrial materials
- new medicines
7
Q
What are the methods of protecting biodiversity?
A
- SSSI
- CITES
- Zoos
- National parks
8
Q
What are transects and what can they show?
A
- a series of quadrat samples taken in a line
- shows the frequency of a species
- distribution of species