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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First submitted	May 24, 2025
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Average score	91.3%
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Hint

Answer

Abiotic factors

Water

Abiotic factors

Light

Abiotic factors

Oxygen

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

__ ________ 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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