In laboratory experiments, two species of the protist paramecium were grown alone and in the presence of the other species. The following graphs show growth of species (1) (left) and species (2) (right), both along and when in mixed culture.
Interpretation of these graphs shows that
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When comparing the growth curves, both Paramecium species reach lower population densities in the mixed culture than when grown alone, showing they are both affected by interspecific competition. However, Species 1 suffers a much more drastic population decline in the mixed culture, while Species 2 continues to thrive relatively well. This indicates that Species 2 is less affected by the competition and is competitively superior.
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