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AQA A2 Geography Unit 3
Succession in a Psammosere:
Presqu'lle: Sand spit on Lake Erie, Pennsylvania
Stage 1: Flotsum
ROLE IN SUCCESSION
·Decomposes to provide a layer of compost
·Protects insects from wind
Stage 2: Mites and Springtails
ROLE IN SUCCESSION
·Feed on flotsum and turn into compost
ADAPTATION
·Springtails can leap to safety…read more

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AQA A2 Geography Unit 3
Succession in a Psammosere:
Presqu'lle: Sand spit on Lake Erie, Pennsylvania
Stage 3: Russian Thistle: PIONEER SPECIES
ROLE IN SUCCESSION
·Long roots bind soil
ADAPTATION
·Waxy leaves protect from wind
·Long roots
·Purple tissue to protect against UV…read more

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AQA A2 Geography Unit 3
Succession in a Psammosere:
Presqu'lle: Sand spit on Lake Erie, Pennsylvania
Stage 5: Seaside Spurge: STABILIZER
ROLE IN SUCCESSION
·Shallow, horizontal root networks bind
dunes
·Low cover
ADAPTATION
·Waxy, fleshy leaves with high water storage
capacity
·Contain white latex, making them taste
unpleasant to rabbits etc.…read more

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AQA A2 Geography Unit 3
Succession in a Psammosere:
Presqu'lle: Sand spit on Lake Erie, Pennsylvania
Stage 6: Hairy Puccoon
ROLE IN SUCCESSION
·Binds dunes more efficiently
ADAPTATION
·Hairy surface protects from sun…read more

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AQA A2 Geography Unit 3
Succession in a Psammosere:
Presqu'lle: Sand spit on Lake Erie, Pennsylvania
Stage 8: Bayberry Trees
ROLE IN SUCCESSION
·Allow shelter for animals
ADAPTATION
·Poisonous leaves withstand animals…read more

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