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    I'm revising for a module test on Biodiversity for tomorrow, and I'm confused about the stability of an ecosystem as succession progresses and reaches a climax.
    It says in my trusty CPG book that the number of species increases as succession progresses, and the ecosystem was more stable...
    but I had previously understood that a lower biodiversity made an ecosystem stable?

    Thanks for the help
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    As succession occurs the species do increase but so does the environments ability to hold them.

    For example on a bare roof lichens and moss pioneer the colonisation of it by producing soil, as more soil builds up larger, more complex plants can also grow, this also contribute to the Humus and soil quality so even more complex plants can grow and so on and so forth.

    I think it happens because when plants die their nitrogen and other useful minerals are released into the soil and therefore improves the soil quality
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    Thanks!
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    If you've got an ecosystem consisting only of simple plants, for example, then a slight rise in temperature could wipe them all out in an instant (because they all respond in the same way to temperature change). However, in the complex ecosystems that result from succession, there's no single factor that's likely to wipe out every organism of every species. An increase in temperature might wipe out one species of plant - but it won't affect them all. So, as the diversity of species increases, so does the stability of the ecosystem (i.e. the entire ecosystem is less likely to be destroyed).
 
 
 
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