Essay on The Effects Of Physical Factors On Diversity

1450 Words Nov 22nd, 2016 6 Pages
This study examined the effects of physical factors on diversity in freshwater environments by observing invertebrate diversity in riffles and pools in a freshwater stream. It was hypothesized that differences in invertebrate diversity between riffles and pools would be due to physical factors in the environment. To test this hypothesis, invertebrates were collected from each environment and classified by their taxa, and Shannon-Simpson indices were produced from these data to analyze the differences in diversity between the two environments. It was found that pools have a significantly greater species abundance, while riffles have a significantly greater species evenness. These results can be used to further examine changing abiotic factors, such as those caused by human activity and interference, and their impacts on freshwater ecosystems across the world.
Introduction
In nature, ecosystems are composed of communities that interact with the abiotic environment around them in complex ways. Often, a shift in one part of the ecosystem will result in a cascade of effects that directly or indirectly impact most, if not all, of the rest of the ecosystem. These changes can come from biotic factors, such as population shifts in predators, prey, parasites, symbiotes, etc. Abiotic factors, such as oxygen levels, nutrients, and sunlight, also play a large role in community ecology. Human activity, such pollution and fertilizer runoff, can also cause major changes in an ecosystem (S.…

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