#22-Consevation Biology Flashcards
How do we measure extinction rates?
The use of fossils as background rates
What is the current extinction rate?
1 species per year
What happens when you declare a species extinct?
People go out an look for it
What is an extinction vortex?
Small population declines even further and becomes even more vulnerable to processes that lead to extinction
When one species goes extinct, it can cause ______?
Secondary extinctions
Who are the greatest losers among native species?
Those that are specialists
-winners are generalists
What is taxonomic homogenization?
The spread of introduced species and native generalists and the declining of native species
How does genetic homogenization occur?
Through hybridization between native and non native specie s
- seeing less pure specie
What are some threats to biodiversity?
Habitat loss
Invasive species
Exploitation
Pollution
What is habitat fragmentation?
Breaking up continuous habitat into patches
What is habitat degradation?
Changes that reduce the quality of the habitat
What happens when a resource has market value?
It’s overharvested
What factors increase the risk of extinction
Genetic drift Inbreeding Genetic variability loss Small populations - ruin efforts to save species
What’s the only way to same a small population from extinction?
To restore the population, have to remove the species from its habitat
What are the evolutionary significantly units?
Appropriate targets for management within species
