Human impacts on biodiversity (Edexcel GCSE Biology): Flashcards
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Define biodiversity
Define biodiversity
Variety of living organisms in an ecosystem
Alternative name for fish farming
Alternative name for fish farming
Aquaculture
Source of pollution from fish farms
Source of pollution from fish farms
Waste, uneaten food, chemicals & antibiotics
Why fish farms spread disease & parasites
Why fish farms spread disease & parasites
High densities of fish promote spread
Impact of feeding farmed carnivorous fish
Impact of feeding farmed carnivorous fish
Depletes wild fish stocks used for fishmeal
Impact of escaped farmed fish
Impact of escaped farmed fish
Compete with indigenous species for food & breeding grounds
Define non-indigenous species
Define non-indigenous species
Species not naturally occurring in an area
Why non-indigenous species out-compete natives
Why non-indigenous species out-compete natives
No natural predators in new habitat
When were cane toads introduced to Australia?
When were cane toads introduced to Australia?
1930s
Why are cane toads harmful?
Why are cane toads harmful?
Toxic to animals that eat them
What causes eutrophication?
What causes eutrophication?
Excess nutrients (nitrates) from fertiliser runoff
Effect of algae in eutrophication
Effect of algae in eutrophication
Block sunlight, preventing plant photosynthesis
Result of oxygen depletion in eutrophication
Result of oxygen depletion in eutrophication
Makes water uninhabitable, kills aquatic animals
What causes acid rain?
What causes acid rain?
Sulfur-dioxide emissions from factories
Example of positive human interaction
Example of positive human interaction
Replanting hedgerows & woodlands or maintaining rainforests