Flashcards in Extinctions And Changes In Biodiversity Deck (9)
What are the 2 biggest threats to organisms from humans?
Exploitation and habitat loss
What factors make species more vulnerable to extinction?
-small populations and/or small geographical range
-species tied to habitats favoured by humans
-species higher in food chain
How many precious Mass Extinction events?
What classes as a mass extinction?
75% of species left
What is the Pleistocene?
Period of time recently where many large mammals species were lost
What are the 2 hypotheses for extinction of the large mammals in present interglacial?
Human over kill
What are the two patterns of changes in diversity with time?
1. General increase (usually with periods of much lower numbers)
2. An increase (usually with periods of decline) then a continued decline to extinction
How long ago was Pangea?
What are the north and south parts called?