Ch 53 - Primary Succession lifeless are where no soil has...

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Ch 53 Ch 53.1 Features of Community Structure: (species diversity and feeding relationships) Species Diversity – diff. organisms that make up the community with 2 components o Species Richness – total number species in the community o Species Abundance – proportion each species represents the individuals in comm. Trophic Structure – feeding relationships Reasons food chains are short o Energetic hypothesis - inefficiency of energy transfer along the chain. o Dynamic Stability hypothesis – Keystone species are not as abundant as Dominant species. Bottom-up Model – V H Lower to higher trophic levels. N->V->H->P N=nutrients Top-down Model = Trophic cascade model (opposite)
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Unformatted text preview: Primary Succession lifeless are where no soil has formed Secondary Succession -soil is intact after disturbance. 53.4 Factors correlated with a communitys species diversity are its geographic locations and size. Tropical habitats support more species than do temperate and polar regions. Factors in equatorial-polar gradients of species richness are evolutionary history and climate. Climate is likely the primary cause of the latitudinal gradient in biodiversity. o Solar energy input and water availability Evotransporation water loss from soil and plants 53.5 Individualistic vs. integrated (plants vs. animals)...
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