(7.1) Succession

Question 1

First example

Answer 1

Bare rock/barren land is first colonised

• Glacier //
• volcanoes
• Silt mud

Question 2

Pioneer species

Answer 2

The first species to colonise an inhospitable environment

Question 3

Climax community

Answer 3

Org which make final stage of succession

1 dom animal & plant species

Question 4

Succession

Answer 4

The changes over time in a species that occupy an area

Question 5

Common features of succession

Answer 5

-NL environment = less hostile: soil forms, +nutrients, plants provide shelter from wind

• A Greater number of variety of habitats
• • Biodiversity; Early stages (greatest), Mid-succesion (Peak) CC- reduced (dom species outcompete pioneer species)
• More complex food webs
• Increased biomass - Mid succession

Question 6

Secondary succession

Answer 6

Rapid process

• doesn’t begin w/ pioneer species!
• land has already sustained life
• land clearance due to forest fire
• (soil is better)

Question 7

Adaptation of pioneer species

Answer 7

• Produce vast quantities of wind dispersed seeds/ spores - easily reach isolated situations
• Rapid germination of seeds on arrival
• They photosynthesise!
• nitrogen fixing (from ats) (soil has few/lil nutrients)
• tolerant to extreme conditions