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6 Cards in this Set
- Front
- Back
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What is succession?
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The changes, over time, in the species that occupy a particular area
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What may catalyse the start of succession?
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A glacier retreating and depositing rock
Sand being piled into dunes by the wind Volcanoes erupting and depositing lava |
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What are features of pioneer species?
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Produce wind-dispersed seeds. Why? So they can easily reach isolated situations
Rapid germination Ability to photosynthesise - no dependency on other species Ability to FIX NITROGEN Tolerance to extreme conditions |
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What is a climax community determined by?
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The main abiotic factor (trees may not develop on high mountains due to the wind, or thin soil)
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What are the common features that emerge due to succession? (5)
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The non-living environment becomes less hostile
A greater number and variety of habitats A greater number and variety of habitats Increased biodiversity More complex foodwebs --> Increased biomass (esp. during mid-succession) |
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Another type of succession occurs when land that has already sustained life is suddenly altered. This may be the result of land clearance. This type of succession does not being with...
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...a pioneer species, but with organisms from subsequent successional stages. Due to the land being altered, the CLIMAX COMMUNITY WILL BE DIFFERENT
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