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Extinction and Population (types of extinction (extinct, extinct in the…
Extinction and Population
types of extinction
extinct
extinct in the wild
locally extinct
globally extinct
functionally extinct
background extinction rate
Most scientists use 1 extinction per million species per year (E/MSY), but it could be lower than this number.
sixth mass extinction event
The sixth mass extinction event has seen rates 100-1000 x higher than the background rate
extinction prediction models
The island biogeography model
explains the species-area relationship seen on islands
demonstrates the relationship between distance to the mainland and size of the island
“Extinction rates will be lower on large islands (LI) than on small islands (SI) because LI will have greater habitat diversity and greater numbers of populations than SI.”
The insular biogeography model
explains how isolated natural communities on the mainland respond to habitat loss.
conclusions
explains how isolated natural communities on the mainland respond to habitat loss.
Humans are causing the sixth mass extinction.
Mass extinctions have unpredictable effects on the evolution of species.
primary risk factors for extinction vulnerability
Narrow geographic range
Only one or a few populations
Small population size
Lives on island habitats
Hunting or harvesting by people