Plant Competition

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traspecific competition in growth of Brassica rapa in low and high-density treatments

Rimel, Stuart F

(thursday 11am)

Intraspecific competition was examined on Brassica rapa, a species of fast growing mustard. Intraspecific competition is competition between individuals of same species living in the same population and competing for a limiting resource (Aspbury and Gabor, 2007). Brassica rapa was grown in a Laboratory in 10.16 cm pots and grouped in treatments of low density – 2 seeds to one pot, and high density- 10 seeds to one pot, and measurements were taken over a seven week period. Data collected from the experiment indicate that intraspecific competition affects developmental characteristics of B. rapa.


Intraspecific competition is the negative affect on fitness that two individuals of the same species who live in the same habitat and rely on the same limiting resource impose on each other (Aspbury and Gabor, 2007). Brassica rapa, a variety of mustard, completes its life cycle within six weeks and makes for an exceptional organism for observation on the effects of intraspecific competition due to B. rapa’s speedy life cycle (Aspbury and Gabor, 2007). Experimentation and observation of intraspecific competition may provide insight to the leading explanation for the developmental characteristics of individuals of a given species grown within high-density populations (Ungar, 1992). Developmental changes in; proportion of surviving individuals, forage biomass, plant height, number of seeds per individual, mean biomass of seeds per individual, number of seeds per pod, and mean root biomass will be observed among B. rapa low density populations against B. rapa high density populations to determine the density-dependent characteristics between both treatments. This study sets out to examine and analyze how intraspecific competition affects developmental changes and modifications to Brassica rapa populations grown in low...
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