Human impacts on biodiversity (Edexcel GCSE Biology Combined Science): Flashcards
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What is biodiversity?
What is biodiversity?
Variety of living organisms in an ecosystem
Alternative name for fish farming
Alternative name for fish farming
Aquaculture
Why do fish farms spread disease & parasites?
Why do fish farms spread disease & parasites?
High densities of fish in enclosures
What are non-indigenous species?
What are non-indigenous species?
Species not naturally occurring in an area
Why do non-indigenous species out-compete natives?
Why do 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
What causes eutrophication?
What causes eutrophication?
Excess nutrients from fertiliser overuse
How do algae affect underwater plants in eutrophication?
How do algae affect underwater plants in eutrophication?
Block sunlight, preventing photosynthesis
What depletes oxygen in eutrophication?
What depletes oxygen in eutrophication?
Bacteria decomposing dead plants
Example of positive interaction: restoring habitats
Example of positive interaction: restoring habitats
Replanting hedgerows & woodlands