3.7 Flashcards
Define biodiversity
The total variation of all living things in an area
Define genetic diversity
Number and frequency of all alleles within a population
In genetic diversity, if a species dies out the species will
Lose genetic diversity
What are the results of the loss of genetic diversity?
Limits the ability of a species to adapt to changing conditions
Define species diversity
Number of different species in an area
What is meant by overexploitation
When populations are reduced to a low level but can still recover
What is the bottleneck event
An event that drastically reduces a size of a population
What are examples of the bottleneck effect
Environmental disaster
Over hunting
Habitat destruction- deforestation
Explain why the loss of genetic diversity bad?
Loose variation for evolutionary responses to changes in the environment
What is habitat fragmentation ?
The clearing of habitats which causes a large area of ground to be separated into small pieces
What increases in species when habitat fragmentation occurs?
Competition
What is the process on which the fragments become smaller
Degradation of the edges
As the fragments get smaller what decreases?
Biodiversity
As the more isolated a fragments becomes the lower the…
Species diversity
To improve depleted biodiversity in fragmentation, what can be introduced ?
Habitat corridors
What do Habitat corridors allow?
Animals move between fragments
More food
More choice of mates
And lead to Recolonisation
What is species introduction?
When a non-native species is introduced to a new geographic location by humans on accident or intentionally.
If the species is established as it is introduced, what is it called?
Neutralised species
If a species spreads rapidly and eliminates native species, what is it called?
Invasive species
Why do invasive species do well?
Free of Predators, Parasites, and pathogens, Competitors
