Competition

Competition - Alexis Gushiken BIS 1CA14 2 June 2008...

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Alexis Gushiken BIS 1C–A14 2 June 2008 Competition Experiment Introduction In an ecosystem there are two types of competition possible, interspecific competition and intraspecific competition. Interspecific competition concerns two species populations competing for limited resources in an ecosystem whereas intraspecific competition concerns members of the same species competing for limited resources (Raven et al., 2005). These resources may include food or nutrients, water, and shelter, which are required for the survival of the majority of organisms. This experiment focuses on intraspecific competition, because we analyzed the competition between individual radish plants ( Raphanus sativus ) and that between the individual beetles ( Tribolium confusum ). The intent of this experiment was to test the carrying capacities of fixed ecosystems (the pots that the radishes were kept in). Carrying capacities are essentially the maximum population sizes that are able to be supported by the amount of resources available. Thus, by testing the carrying capacities in this case, we are testing how densely populated the ecosystems can be before their survival rates and growth (biomass and length) of the specific species begin a constant decline. Materials and Methods I followed the instructions given by my T.A. and the BIS 1C Laboratory Manual (Canington et al., 2008). Results The results for the mean number of plants surviving from each seed density treatment showed 100% survival rate for the two seed treatment, 95% for the four seed
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treatment, and 87.5% for the eight and sixteen seed treatment (Figure 1). From this, we can see that the sixteen seed treatment showed 12.5% less survivorship than the two seed treatment. For the mean biomass of the population versus seed density treatment, there was a 114% increase in mean biomass from the two seed treatment to the four seed treatment. From the four to the eight seed treatment, there was an 88.7% decrease, and from the eight to sixteen seed treatment, there 119% increase (Figure 2). Thus overall, from the two to the sixteen seed treatment, there was an 82.6% increase in mean biomass. Figure 3 shows the mean biomass per plant for each seed density treatment.
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Competition - Alexis Gushiken BIS 1CA14 2 June 2008...

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