Summary Eduquas (England) Paper 1 Populations and ecosystems Part 2

topic 12
population size and ecosystems 2

- Principles of succession
- Recycling nutrients
- Carbon cycle
- Nitrogen cycle
- Human activity
- Eutrophication

, Succession
Succession: is the change in structure and spices
composition over time.

Secession is an ecological possess in which some of the
organisms in the community are gradually replaced by
others and the sequence of communities are called sere.
Colonisation of bare rock is a lithesome. Different stages
in succession when particular communities dominate are
known as seral stages.
All succession involves change in community structure
and functions until a community reaches a climax of
succession known as climax community.




moss will grow trees will begin to
Woody plants
liches weather rocks and nutraints grow with create
grow inculding
produceing sand/soil give a thick soil a climax
grasses and scrub
layer community
Biomass – the mass of living matirial present at a given
time.
Climax community – The community has reached
equallibrium with its environment and no further chnges
occor.
sere- a stage in sucssesstion
Pioneer – the first organisums to colonise a community