Limitations of Population Growth - 1972 Words

Introduction There are a number of factors that can contribute to the growth of a population and these trends can be seen in a number of species. It is generally believed, from an ecological perspective, that populations will display either an exponential of logistic growth rate. If optimal environments are consistently maintained with no biotic or abiotic limiting factors (excess food, excess space availability, optimum climactic environment, no predation, etc) then a population will grow in an exponential direction. Species with high maximal relative growth rates do not occupy infertile habitats because their physiologies are more sensitive to suboptimal habitats and so their relative growth rates decrease more rapidly as fertility†¦show more content†¦Each bottle was filled 3/4 full with spring water from the San Marcos River. The water levels in the bottles were marked for future reference. Ten large Daphnia magna were carefully placed n each bottle along with a pin ch of Spirulina (powdered algae). For the duration of the experiment, only the supplemented group of Daphnia magna received food weekly, the unsupplemented did not. Spring water was added periodically to the bottles when the water levels were below the line marked previously. Each week the numbers of Daphnia were counted utilizing a light source in order to illuminate the Daphnia and allowed them to be visible. The daphnia were placed in the designated lab area that maintained at room temperature. The data for a total span of 8 weeks was pooled and recorded. The data was then used for various types of statistical analysis including weekly means, per capita growth rates, t-tests, etc. Results According to the data collected, the Daphnia magna population in neither the supplemented treatment nor the unsupplemented treatment portrayed either the exponential or logistic growth model. The supplemented group showed a steady decline in the population while the unsupplemented group at first began with a significant drop off at first but then also became a steady decline. The week with the highest maximum growth rate for the supplemented group was week 7 and for the unsupplemented group was also in week 7. TheShow MoreRelatedEconomic Growth And Quality Of Life1122 Words   |  5 PagesEconomic Growth and Quality of Life Economic Growth refers to a nation’s outputs of goods and services over time. It is measured in terms of Gross Domestic Product (GDP) which is a valuation of a country’s total production in a year. In 2007-08, Australia had a GDP growth rate of 3.7%. By 2012, this growth rate had dropped to 3.1% despite the 20 years of continual economic growth in Australia averaging 3.5% up until 2012. 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