BIOL208 Lecture Notes - Lecture 28: Phosphorus Cycle, Secondary Succession, Primary Succession
11 Apr 2018
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Bio 208 lecture 28 friday, march 23, 2018. Deforesttion and nutrient cycling: deforestation soil erosion nitrogen can escape the cycle, absence of tree roots made it so that there was nothing left to retain the nutrients. Primary succession: succession on newly exposed geological substrates, not significantly modified by organisms. Secondary succession: when a community is changed, e. g. logging, construction sites (so long as the soil is left, community is removed, but the soil is still there. It"s a gradient, communities are not strictly one or the other. Intermediate levels of disturbance promote higher diversity: not frequent or infrequent disturbance, middle ground promotes higher diversity, there"s more and more evidence that this is not always the case. It"s oversimplified, there are more factors that come into play. Community stability: stability: ability to resist change or grow back/recover/bounce back quickly after a disturbance. Increased diversity: more resistant and stable community with higher biodiversity.
