Biology Unit 5 - Succession 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelEdexcel Created by: lauraking20Created on: 11-06-17 09:10 What is succession? The process of ecosystem change 1 of 22 2 types of succession? Primary and secondary 2 of 22 Where does primary succession occur? On land thats been newly formed/exposed 3 of 22 Where does secondary succession occur? Land thats been cleared of all the plants, but where soil remains 4 of 22 What may happen to allow primary? (2) 1) A volcano erupted to form new rock surface 2) Just bare rock 5 of 22 What may happen to allow secondary? 1) Forest fire 2) Forest cut down by humans 6 of 22 When does primary begin? When species colonise a new land surface 7 of 22 What are the first species called? Pioneer species 8 of 22 What might begin to grow? Seeds and spores - blown in by the wind 9 of 22 What are the abiotic conditions like at the beginning? Very harsh 10 of 22 Why can only pioneer species grow? Because their specially adapted 11 of 22 Example of pioneer? Marram grass 12 of 22 What do pioneer species do? Change the abiotic conditions 13 of 22 How does a basic soil form? The pioneers die and microorganism decompose the dead organic material 14 of 22 What happens at each stage? Different plans and animals that are better adapted for the improved conditions one in and out-compete those already there 15 of 22 What is the main species in the area called? The dominant species 16 of 22 What increases as succession keeps happening? Biodiversity 17 of 22 What is the final stage called? The climax community 18 of 22 Climax community in temperate climate? (lots of water, mild temp) Large trees (are deep soils) 19 of 22 Climax community in polar community? (low temp, little water) Herbs and shrubs 20 of 22 How can succession be prevented? Human activities - e.g. mowing grass 21 of 22 What is the climax community called when succession is artificially stopped? Plagioclimax 22 of 22
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