succession edexcel biology

8/18/2019 Succession edexcel biology

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7. Ecological

Succession

7.1 Succession


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Starter Match up the key

word to the definition

Ecosystem

Biotic

Abiotic

Community

An ecological factor that makesup part of the nonbiological

en!ironment

More or less selfcontainedfunctional unit in ecology made up

of all the interacting biotic andabiotic factors in an area

"he organisms of all species thatli!e in the same area

An ecological factor that makesup part of the li!ing en!ironment

of an organism


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#earning $b%ecti!es

&escribe changes that occur in the !ariety

of species occupying an area o!er time

&efine succession and clima' community

Success Criteria

(ou can describe the order of plant

succession and e'plain common features

of succession


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Succession

"he changes) o!er time) in the species

that occupy a particular area


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Succession of bare rock or barren

land Succession happens when an area is first

colonised. *hat might happen to cause

this+ A retreating glacier depositing rock

*ind or sea piling sand into dunes

,olcanoes erupting and depositing la!a#and subsiding and creating lakes or ponds

Silt and mud being deposited at ri!erestuaries


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-ioneer Species

"he first stage of succession in!ol!es

pioneer species colonising an

inhospitable en!ironment -ioneer species ha!e features that suit

them to colonisation


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"ask

n pairs) come up with a list of features

that pioneer species may ha!e) which

would help them to colonise inhospitableen!ironments


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/eatures of -ioneer Species

-roduction of a lot of winddispersedseeds to easily reach isolated areas

0apid germination of seeds "he ability to photosynthesise "he ability to fi' nitrogen from the

atmosphere "olerance to e'treme conditions


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Stages of -lant Succession


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Stages of -lant Succession

Colonisers (lichens): when they die) theyrelease nutrients. "his changes the abiotic

en!ironment by creating soil. Mosses, then Ferns: rock is continually

eroded) as these die organic matterincreases) building up soil

Small flowering plants, shrubs then trees establish


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Clima' Community

"he organisms that make up the final

stage of ecological succession

A balanced euilibrium

n the 23) this is deciduous woodland


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Animal Succession

Animal species present depend on the

plant species found in the area

/or e'ample) mosses and grasses pro!ide

food and habitats for insects and worms.

"hese can then support secondary

consumers.


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Common features in any

succession "he nonli!ing en!ironment becomes less

hostile

A greater number and !ariety of habitats

ncreased biodi!ersity

More comple' food webs

ncreased biomass


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#and alteration Succession also occurs when land is

suddenly altered e.g. from a fire

"he area will then undergo succession to

return to a stable) clima' community

"his type of succession doesn4t begin with

a pioneer species


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#earning $b%ecti!es

&escribe changes that occur in the !ariety

of species occupying an area o!er time

&efine succession and clima' community

Success Criteria

(ou can describe the order of plant

succession and e'plain common features

of succession

succession edexcel biology

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