lecture 2 Flashcards
what are the big 5 marine extinction events?
- ordovician-silurian (83% lost)
- late devonian (75% lost)
- permian (96% lost)
- triassic (80% lost)
- creataceous (76% lost)
mass ? and mass ? are indistinguishable
mass rarity & mass extinction
what is the difference between previous extinctions and current extinction threats, associated with ecological selectivity patterns?
previous extinctions = largely pelagic animals, independent of other predictors
current extinction threat = larger and more motile animals
what are the 4 types of extinctions?
- complete species loss: 15 global extinctions of marine species in the past 514 years
- local extinctions: due to geographic range constrictions
- ecological extinctions: species that are no longer sufficiently abundant to perform their functional roles
- commercial extinctions: species that are no longer sufficiently abundant for commercial harvesting
what are the 4 types of extinctions?
- complete species loss: 15 global extinctions of marine species in the past 514 years
- local extinctions: due to geographic range constrictions
- ecological extinctions: species that are no longer sufficiently abundant to perform their functional roles
- commercial extinctions: species that are no longer sufficiently abundant for commercial harvesting
what are the consequences of species extinctions? (3)
- more than just loss of taxonomic diversity
- mass rarity of organisms = reduction in geographic range and/or numerical abundance
- prolonged periods of ecological change
what are the ecological consequences of changing biodiversity?
- loss of species
- species invasions
- shifts in trophic skew
what are the benefits of biodiversity to human wellbeing?
- food
- coastal protection
- carbon storage
- climate regulation
What was the target of the 2001 Convention on Biological Diversity in Global Biodiversity Outlook 1?
to tackle drivers that influence direct pressures on biodiversity
