The Effects Of Intraspecific Competition On Growth Rate And Carrying Capacity Between Differing Initial Densities

As the amount of available land decreases, vital resources such as food, water, and living space will decrease as well.

Another reason that larger organisms have lower population densities than smaller organisms is that many large organisms depend on small ones as their food source. Thus, there would have to be significantly less of these large organisms than the small ones for both these populations to survive.

In this lab, we examined protist survival in different communities. An biological community is a community where two or more species coexist in

Purpose: The purpose of this lab is to observe the behavior of the Armadillium vulgare (roly- poly

Biodiversity is life’s variety. It is the varying genetics that each species carries that makes it different and “unique”. Biodiversity is important, not only in evolution, but in survival; when sometimes those terms can mean the very same thing. Interestingly, biodiversity can mean a variance in the life itself – or within the genetics of a species. In keeping breeding habits within the same lineage, some animals risk lower biodiversity and sometimes even deformities and disease, as they are able to more easily pass on unfavorable hereditary traits. In increasing the overall biodiversity, the only risk is a

Background information: In this lab you will be looking at the growth of bacteria under different conditions to see the how populations of bacteria grow. Read about cells in the text or e-text. For everyone, in your e-text read chapter 13, sections 13.3 and 13.4 to learn more about bacteria. Then answer the questions below.

Arnold, P. (2009, December 4). Endangered Species Tasmanian Devil: Low Genetic Diversity as a Factor of the Tasmanian Devil as an Endangered Species. Retrieved March 8, 2015, from http://www.brighthub.com/science/genetics/articles/13897.aspx

When we factored in the control jars, we revealed inconsistencies in the data, which led us to believe that there were unacknowledged errors in our experiment. Had the experiment proceeded as planned, our control jars would have contained the highest concentration of algae due to the absence of any consumers. Without any consumers, the algae grew without any limiting factors. Since those jars were the controls, it suggested that the errors occurred in our experimental jars. The algae concentration in the jars of 3 brine shrimp

The population dynamics of Daphnia magna are observed under three different conditions; low, medium, and high density. The effects of different population densities on the survivorship and reproduction of Daphnia are observed over a two-week period within a lab environment. Over the two week period, the numbers of parent Daphnia alive and dead are recorded daily, along with the amount of offspring produced each day. From the main parameter investigated, the net reproductive rate, the results of the experiment support that higher densities result in less successful reproduction and decreased fecundity. Values for the instantaneous growth rate of the populations also suggests that low and medium density populations allow for

The researchers were tasked to investigate phenotypic changes in Paramecia. Paramecia are single celled organisms that have appendages attached to their bodies called cilia. The cilia help by allowing a Paramecium to move away from toxins, and towards a food source. The cilia are important because their water environment lacks movement. In the lab, the Paramecia were grown in flask that contained the wheat media, and the bacteria, Klebsilla pneunomiae, was inoculated into the flask. The wheat media was the ideal environment for a Paramecium to grow; Klebsilla pneunomiae was the food source for the organism. The researchers maintained cultures of Paramecium before they introduced the mutagen caffeine. The students believed that if a culture

They feed on bacteria and since bacteria create a slightly acidic environment around themselves, paramecia are attracted to acidity. A paramecium exchanges gases as oxygen from nearby water diffuses in through the cell membrane while carbon dioxide diffuses out through the cell membrane. Paramecia excrete waste substances by using vacuoles that contract; waste substances are stored in vacuoles (storage bubbles) which contract and expel the waste

As the name implies, r-selected species are those that place an emphasis on a high growth rate, and, typically exploit less-crowded ecological niches, and produce many offspring, each of which has a relatively low probability of surviving to adulthood.They are populations that experience rapid growth of the J-curve variety. The offspring produced are numerous, mature quite rapidly, and require very little postnatal care. Consequently, this population grows fast, reproduces quickly, and dies quickly. Bacteria are examples of r- selected species.

The purpose of the paramecium experiment was to observe competition or allelopathy between two different species of paramecium in the laboratory. Allelopathy is a way organisms inhibit or affect other organisms when developing in nature. This insures the survival of one organism against another organism. For instance in plants, some can release a chemical that enters the environment and inhibits the growth and development of surrounding plants. Another example in nature is plants developing defenses to prevent herbivores from eating them. This kind of competition happens in nature when the need for resources is limited and survival is necessary. Competition is displayed throughout nature all the time. A man named Georgy Gause previously conducted this experiment between P. aurelia and P. caudatum. He determined that different factors influence how the two species compete and coexist. Ever since then not many scientist have attempted to experiment on paramecium. Only until recently have more experiments been attempted. The issue with the experiment was that it was conducted in 1935 and nowadays there are more advance ways to conduct and interpret the experiment and results.

In conclusion the purpose of this experiment was to see how competition for natural resources in the environment can affect population growth. Also, to explain how limitations of resources affect different species of Paramecium. The hypothesis was that if the Paramecium Aurelia and Paramecium Caudatum grow alone then they will grow more productively because together they would eventually overload the carrying capacity. In this experiment the hypothesis was shown to be correct. The data did support the hypothesis. According to the data, the Paramecium caudatum population reached its carrying capacity on day 8 (58 cells/mL) when it was alone. Although, when the Paramecium caudatum in mixed culture it reached its carrying capacity on day 8 when

Six experiments were carried in this report concerning the effect that different environmental factors have on microbial growth. The results were recorded into tables where (+) symbolises growth and (–) symbolises no growth.