TLE - Threats to biodiversity (2)

A Level Environmental Science revision / Make connections to the physical environment + pollution (you know the missing stuff)

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Last updated: May 24, 2025

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Hint	Answer
Abiotic factors	Water
Abiotic factors	Light
Abiotic factors	Oxygen
Abiotic factors	pH
Abiotic factors	Temperature
Abiotic factors	Nutrients
Changes may be caused by inactivity, e.g.	Stopping plagioclimax management
Changes to water availability	Damming
Changes to water availability	Draining
Changes to water availability	Flooding
Changes to water availability	Overabstraction
Changes to light levels	Eutrophication
Changes to light levels	Forest clearance
Changes to light levels	Turbidity
Impacts of forest clearance	Bat inactivity
Impacts of forest clearance	Forest fires
Impacts of forest clearance	Photo-oxidation
Impacts of forest clearance	Soil erosion
Changes to oxygen levels	Organic pollution
Changes to oxygen levels	Thermal pollution
Changes to pH levels	Acid mine drainage
Changes to pH levels	Acid rain
Changes to pH levels	Pollutant gases

Hint	Answer
__ ________ depends on _______ and number of ________ ions	H+ tolerance, alkalinity, carbonate
Illness caused by low pH	Chronic stress
Acidic soils	Inhibits nutrient uptake
Acidic soils	Mobilises toxic metals
Alkaline soils	Inhibits nutrient solubility
Organisms most vulnerable to low pH (3)	Clams, crayfish, snails
Changes to temperature	Thermal pollution
Changes to temperature	Waste
Changes to temperature	Water capacity
Effects of sudden temperature increase	Thermal shock
Biotic factors	Interspecies relationships
Biotic factors	Introduced species
Causes of loss of interspecies relationships	Pesticides
Causes of loss of interspecies relationships	Over-exploitation
Causes of loss of interspecies relationships	Habitat loss
________ ________ was introduced from ___ ___ to ________ gardens where it became ______ as its strong ____ grow rapidly	Japanese knotweed, East Asia, ornamental, invasive, roots
The _______ ___ squirrel is ____ and better adapted to ________ food (e.g. ___ _____) than the _____ ___ squirrel	American Grey, larger, digesting, oak acorns, British Red
Grey squirrels introduced...	Squirrel pox
The _____ _______ decimated UK ____-_______ crayfish	Signal Crayfish, white-clawed
Signal Crayfish advantages	Aggresive
Signal Crayfish advantages	Larger
How Signal Crayfish alter the environment	Burrowing
Signal Crayfish introduced...	Crayfish plague

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