Chapter 11 - Biodiversity Flashcards
What is biodiversity ?
The variety of living organisms in an area
What are some habitat examples
- treetops
- oceans
- sand dunes
What are the two way in which diversity in a habitat is measured?
Species richness, and species evenness
What does species richness mean?
The number of different species living in an area
What does species evenness mean?
The comparison of populations of different species living in an area
What does genetic biodiversity mean?
The number of different polymorphic alleles per gene locus
What does a high value in Simpsons diversity index tell you about a habitat?
There is a high diversity of organisms and the population should be very resistant to change
WhT are the three levels at which biodiversity can be considered?
- habitat
- species
- genetic
What is systematic sampling?
Sampling carried out at regular intervals
What is stratified sampling?
When the sampling is proportional to the size of each population which is determined beforehand
How would you calculate genetic biodiversity?
Number of polymorphic gene Loci / total number of gene loci
What is an SSSI?
Site of special scientific interest
What is ex situ conservation as opposed to in situ conservation ?
- ex situ conservation is maintaining a population outside its natural habitat
- in situ conservation is maintaining a population inside it’s natural habitat
When a species is extinct, what has happened to it?
Loss of all the members of its species
What does extinct in the wild mean ?
Loss of all members of a population in the wild, but surviving members are kept in captivity for safety.