Biology 2483A Lecture 18: Lec 18 Species Diversity in Communities

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Species diversity differs among communities as a consequence of regional species pools, abiotic conditions and species interactions. Resource partitioning is theorized to reduce competition and increase species diversity. Processes such as disturbance, stress, predation, and positive interactions can mediate resource availability, thus promote species diversity. Species diversity affects community function: species diversity differs among communities as a consequence of regional species pools, abiotic conditions and species interactions, species supply. Gamma diversity is regional species pool and alpha diversity is local community richness. Linear correlation = dispersal is driving it (wind, water, swimming, running, bird carrying seeds and depositing them, etc. ) Humans are a vector for dispersal of invasive species. One of the biggest human vectors done by accidents cargo ships. Ballast water ships are unstable if they"re riding high in the water, they pump water into the lower part of the hull to lower the ship in the water and give it more stability.

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